HomeMy WebLinkAboutLate Communication - Operations Committee 12-7-2022OCR MEMORANDUM
ORANGE COUNTY SANITATION DISTRICT
December 7, 2022
TO: Operations Committee
Orange County Sanitation District
FROM: Kelly A. Lore
Clerk of the Board
RE: LATE COMMUNICATION
The Clerk of the Board received communication from Director of Engineering,
Kathy Millea after the publication of the agenda regarding items presented to the
OC San Operations Committee. One updated attachment is included and a minor
change to the recommendation.
9. TPAD DIGESTER FACILITY AT PLANT NO. 2, PROJECT 2022-2538
NO. P2-128
RECOMMENDATION: Recommend to the Board of Directors to:
A. Consider, receive, and file the Addendum to the Final Program
Environmental Impact report for Biosolids Master Plan for Project No. P2-
128; and
B. Approve the project modifications as identified and described in the
Addendum to the Final Program Environmental Impact report for Biosolids
Master Plan for Project No. P2-128 (Chapter 4.0, Table 2, pages 8 1T page
ADDENDUM TO THE FINAL PROGRAM
ENVIRONMENTAL IMPACT REPORT
FOR BIOSOLIDS MASTER PLAN
FOR PROJECT NO. P2-128
SCH #: 2017071026
Prepared for December 2022
Orange County Sanitation District
10844 Ellis Avenue
Fountain Valley, CA 92708
F ESA
J
ADDENDUM TO THE FINAL PROGRAM
ENVIRONMENTAL IMPACT REPORT
FOR BIOSOLIDS MASTER PLAN
FOR PROJECT NO. P2-128
SCH #; 2017071026
Prepared for
Orange County Sanitation District
10844 Ellis Avenue
Fountain Valley, CA 92708
626 Wilshire Boulevard
Suite 1100
Los Angeles, CA 90017
213.599.4300
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December 2022
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TABLE OF CONTENTS
Addendum to the Final Program
Environmental Impact Report
for Biosolids Master Plan
for Project No. P2-128
Paqe
1.0 Introduction..................................................................................................................1
1.1 Project Overview................................................................................................... 1
1.2 Purpose of the Addendum.................................................................................... 3
1.3 Regulatory Background........................................................................................ 3
2.0 Program Objectives.....................................................................................................5
3.0 Project Overview.......................................................................................................... 5
3.1 TPAD Digester Facility.......................................................................................... 6
3.2 Perimeter Wall...................................................................................................... 6
4.0 Description of the Modifications................................................................................ 7
4.1 TPAD Digester Facility Project Modifications........................................................
7
4.2 South Perimeter Wall and Soil Improvements Project Modifications ..................
15
5.0 Evaluation of Environmental Impacts......................................................................19
Aesthetics....................................................................................................................
19
Agriculture and Forestry Resources.............................................................................
27
AirQuality....................................................................................................................
30
BiologicalResources...................................................................................................
39
CulturalResources......................................................................................................47
Energy..........................................................................................................................
51
Geologyand Soils........................................................................................................
57
Greenhouse Gas Emissions........................................................................................
64
Hazards and Hazardous Materials...............................................................................69
Hydrology and Water Quality.......................................................................................
74
LandUse and Planning................................................................................................80
MineralResources.......................................................................................................
82
Noise............................................................................................................................
84
Populationand Housing...............................................................................................88
PublicServices............................................................................................................
90
Recreation....................................................................................................................
92
Transportation..............................................................................................................
94
Tribal Cultural Resources.............................................................................................98
Utilities and Service Systems.....................................................................................
100
Wildfire.......................................................................................................................
103
Addendum to the Final Program Environmental Impact Report I ESA / D201500626.02
for Biosolids Master Plan for Project No. P2-128 December 2022
Table of Contents
Mandatory Findings of Significance..............................................................
Summary.......................................................................................................
List of Figures
Paqe
105
.. 107
Figure 1 Regional Location Map............................................................................................4
Figure2 Site Plan.................................................................................................................. 9
Figure3 Digester Plan View................................................................................................ 11
Figure 4 Thermophilic Digesters Sections........................................................................... 12
Figure5 Construction Stages.............................................................................................. 17
Figure6 Bike Detour Plan.................................................................................................... 18
Figure 7 Pre- and Post-Construction................................................................................... 21
List of Tables
Table 1 P2-128 Prior Project Numbers.................................................................................5
Table 2 PEIR Project elements Compared to P2-128 Modifications.....................................8
Table 3 Mitigated Regional Construction Emissions for the Approved Project and
ModifiedProject.....................................................................................................34
Table 4 Regional Operational Emissions for the Approved Project and Modified
Project................................................................................................................... 34
Table 5 Mitigated Localized Construction Emissions for the Approved Project and
ModifiedProject.....................................................................................................36
Table 6 Estimated Total Construction -Related GHG Emissions for the Project and
ModifiedProject.....................................................................................................65
Addendum to the Final Program Environmental Impact Report II ESA / D201500626.02
for Biosolids Master Plan for Project No. P2-128 December 2022
ADDENDUM TO THE FINAL PROGRAM
ENVIRONMENTAL IMPACT REPORT
FOR BIOSOLIDS MASTER PLAN
FOR PROJECT NO. P2-128
1.0 Introduction
1.1 Project Overview
1. Project Title:
2. Lead Agency Name and Address:
P2-128: Temperature Phased Anaerobic
Digestion (TPAD) Digester Facility at Plant
No. 2 and P2-128A: South Perimeter Wall and
Soil Improvements at Plant No. 2
Orange County Sanitation District
10844 Ellis Avenue
Fountain Valley, CA 92708
3. Contact Person and Phone Number: Kevin Hadden, 714.593.7462
4. Project Location: Orange County Sanitation District
Treatment Plant No. 2
22212 Brookhurst Street
Huntington Beach, CA 92646
5. Project Sponsor's Name and Address: Orange County Sanitation District,
10844 Ellis Avenue
Fountain Valley, CA 92708
6. General Plan Designation(s)
7. Zoning:
Public (P)
Industrial Limited (IL) and
Residential Agriculture with an Oil Overlay
(RA-O)
8. Description of Project: (Describe the whole action involved, including but not limited to
later phases of the project, and any secondary, support, or off -site features necessary for its
implementation. Attach additional sheets if necessary.)
Section 4.0, Description of the Modification below, describes the proposed Project Modifications.
Addendum to the Final Program Environmental Impact Report ESA / D201500626.02
for Biosolids Master Plan for Project No. P2-128 December 2022
Addendum to the Final Program EIR
9. Surrounding Land Uses and Setting. (Briefly describe the project's surroundings.)
The Santa Ana River (SAR) and SAR Trail are located immediately east of the facility.
Residential neighborhoods are located north and west of Plant No. 2. The Talbert Marsh, Talbert
Channel, Pacific Coast Highway (PCH), and the Pacific Ocean are located south of Plant No. 2.
10. Other public agencies whose approval is required (e.g., permits, financing approval, or
participation agreement.)
The proposed Project Modifications may require approvals from the following agencies:
• South Coast Air Quality Management District (SCAQMD), permit for construction of the
Digester Feed Facility (DFF) Odor Control Facility, Thermophilic Digesters, Batch Tanks,
Cooling Tower Facility, and Boiler Facility.
• City of Huntington Beach Conditional Use Permit (CUP) and Coastal Development Permit
(CDP), Building Permit, and Encroachment Permit
• Regional Water Quality Control Board, Storm Water Pollution Control Plan (SWPPP) and
General Construction Permit
• Orange County Public Works/Orange County Flood Control District Easement and
Encroachment Permit
Addendum to the Final Program Environmental Impact Report 2 ESA / D201500626.02
for Biosolids Master Plan for Project No. P2-128 December 2022
Addendum to the Final Program EIR
1.2 Purpose of the Addendum
Orange County Sanitation District (OC San) is proposing to implement Project No. P2-128 TPAD
Digester Facility at Plant No. 2, which is the combination of two projects identified in OC San's
2017 Biosolids Master Plan (BMP 2017): P2-504/P2-504A/P2-504B Temperature Phased
Anaerobic Digestion (TPAD) Digester Facility and P2-501 Perimeter Screening, which are both
located at Plant No. 2 in Huntington Beach (Figure 1). OC San certified a Final Programmatic
Environmental Impact Report (PEIR) in 2018 as lead agency pursuant to the California
Environmental Quality Act (CEQA) for the BMP 2017 that identified both projects as part of the
overall BMP 2017. Since the certification of the BMP 2017, modifications have been proposed. The
purpose of this document is to describe and evaluate the potential environmental effects associated
with the Project Modifications to the TPAD Digester Facility and Perimeter Screening Project
(Public Resources Code §21166; CEQA Guidelines § 15162; CEQA Guidelines § 15168(c)(2)).
1.3 Regulatory Background
Per CEQA Guidelines Section 15168(c)(2), if the agency finds that pursuant to section 15162 no
subsequent EIR would be required, the agency can approve the activity as being within the scope of
the project covered by the program EIR, and no new environmental document would be required.
Per CEQA Guidelines Section 15162, a subsequent EIR must be prepared i£
• Substantial changes are proposed in the project which will require major revisions of the
previous EIR or negative declaration due to the involvement of new significant
environmental effects or a substantial increase in the severity of previously identified
significant effects;
• Substantial changes occur with respect to the circumstances under which the project is
undertaken which will require major revisions of the previous EIR or Negative Declaration
due to the involvement of new significant environmental effects or a substantial increase in
the severity of previously identified significant effects; or
• New information of substantial importance, which was not known and could not have been
known with the exercise of reasonable diligence at the time the previous EIR was certified as
complete or the Negative Declaration was adopted, shows any of the following:
— The project will have one or more significant effects not discussed in the previous EIR or
negative declaration;
— Significant effects previously examined will be substantially more severe than shown in
the previous EIR;
— Mitigation measures or alternatives previously found not to be feasible would in fact be
feasible, and would substantially reduce one or more significant effects of the project, but
the project proponents decline to adopt the mitigation measure or alternative; or
— Mitigation measures or alternatives which are considerably different from those analyzed
in the previous EIR would substantially reduce one or more significant effects on the
environment, but the project proponents decline to adopt the mitigation measure or
alternative.
Addendum to the Final Program Environmental Impact Report 3 ESA / D201500626.02
for Biosolids Master Plan for Project No. P2-128 December 2022
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Addendum to the Final Program EIR
Section 15164(a) of the CEQA Guidelines provides that an addendum to a previously certified EIR
is permissible if some changes or additions are necessary but none of the conditions described in
Section 15162 calling for preparation of a subsequent EIR have occurred. As described in detail
below, the proposed Project Modifications would not result in any of the conditions listed in CEQA
Guidelines Section 15162. As a result, this Addendum has been prepared.
This Addendum relies on the significance criteria established in the CEQA Guidelines and the
resource analysis methodology, described in the EIR, to assess the potential impacts related to the
proposed Project Modifications. Each resource section presents a summary and a determination
as to whether the proposed Project Modifications would result in new significant impacts, or a
substantial increase in the severity of previously identified significant impacts.
In compliance with CEQA Guidelines Section 15150, this Addendum has incorporated by
reference the Draft and Final PEIR for the BMP 2017, certified by OC San in 2018, which
includes all technical studies, analyses, and technical reports that were prepared as part of the
Draft and Final PEIR.
2.0 Program Objectives
The primary objectives of the BMP 2017 are to:
• Replace aging facilities and mitigate the structural and seismic risks for onsite biosolids
structures;
• Phase -out the diversion of biosolids organics as an alternative daily cover for landfills;
• Transition from Class B to Class A biosolids quality at Plant No. 2 to increase biosolids
management diversity for end users of biosolids; and
• Receive pre-processed food waste (source separated organics [SSO]) for co -digestion to assist
in diverting organics from landfills and to increase digester gas production used as a
renewable energy source.
3.0 Project Overview
Project P2-128 combines several projects that were identified in the BMP 2017 and incorporated
into OC San's Capital Improvement Program (CIP) through the 2017 Facilities Master Plan (FMP
2017). Table 1 summarizes the project numbers used for the BMP 2017 and the FMP 2017/CIP.
In this document, the Project is referred to as P2-128 and includes two main components: the
TPAD Digester Facility and the South Perimeter Wall and Soil Improvements.
TABLE 1
P2-128 PRIOR PROJECT NUMBERS
P2-128 Project Component BMP 2017 Project Numbers FMP 2017/CIP Project Numbers
P2-128 TPAD Digester Facility at Plant No. 2 P2-504, P2-504A, P2-50413 P2-128 TPAD Digester Facility
TPAD Digester Facility
P2-128A South Perimeter Wall and Soil P2-501 Perimeter Screening P2-125 Southwest Perimeter
Improvements at Plant No. 2 Screening
Addendum to the Final Program Environmental Impact Report 5 ESA / D201500626.02
for Biosolids Master Plan for Project No. P2-128 December 2022
Addendum to the Final Program EIR
3.1 TPAD Digester Facility
The description below is from the BMP 2017 for the TPAD Digester Facility project (Project No.
P2-128 or P2-504/P2-504A/P2-504B).
P2-504 would construct six 110-foot diameter, 40-feet tall (above ground)
digesters designed to operate in either mesophilic or thermophilic operation, and
TPAD sludge cooling facilities which include a pump station,
ultrafiltration/nanofiltration facilities, sludge cooling heat exchangers, and a
power building. All new digesters would share a common Digester Control
Building that would house various pumps, pipelines, grinders, heat exchangers,
electrical, HVAC (heating, ventilation, and air conditioning), and other ancillary
facilities. A new Power Building will furnish electrical power for the new
facilities. Six 400,000-gallon, 33.5-feet above surrounding grade Class A batch
tanks would be constructed to produce Class A biosolids per EPA 503
regulations through batch holding over a specified time and temperature. The
Class A batch tanks would require other ancillary equipment such as pumps, heat
exchangers and grinders. The proposed new 33-foot diameter, 30-foot high
(above ground) Digester Feed Facility (DFF) would replace the existing Sludge
Blending Facility (SBF) where primary sludge and scum is blended and fed to
the digesters. The DFF would include thickened sludge tanks, grinders, pumps,
and odor control facilities using carbon towers and bioscrubbers (PEIR, p. 2-13).
This project includes the demolition of the existing abandoned solids storage
truck loading facility and surface asphalt areas. The total demolition would be
approximately 113,000 cubic yards. This project also includes the excavation of
soil for the proposed TPAD facilities to establish foundations and includes the
construction of digester tanks, power building, electrical control rooms, batch
tanks, digester feed facility, water cooling pump station and water softeners. The
demolition and construction equipment needed for the project includes scrapers,
backhoes, loaders, dozers, dump trucks, and cranes. The paving equipment
needed for this project includes a grader, loader, and paver. Approximately 7 to
120 workers would be required at a time during various stages of construction. A
minor amount of the excavated soils would be reused onsite as backfill, and there
will be approximately 121,000 cubic yards that will be exported and 8,000 cubic
yards that will be imported (PEIR, p. 2-26).
3.2 Perimeter Wall
The description below is from the BMP 2017 for the Perimeter Screening project (Project No. P2-
125/P2-501).
P2-501 would improve the perimeter walls of Plant No. 2. Currently, there are two
concrete masonry unit (CMU) block retaining walls and vegetated berms; one wall
approximately 15 feet high located along Talbert Marsh at Plant No.2 and another
wall approximately 5 to 6 feet high with vegetation located along Brookhurst
Addendum to the Final Program Environmental Impact Report 6 ESA / D201500626.02
for Biosolids Master Plan for Project No. P2-128 December 2022
Addendum to the Final Program EIR
Street. P2-501 would improve or replace the perimeter screening to provide a
visual buffer for all proposed facilities and associated construction activities along
Brookhurst Street and Talbert Marsh. The perimeter screening would be extended
up to approximately 4,325 feet in length along Brookhurst Street and up to
approximately 1,030 feet along Talbert Marsh. Further, the perimeter screening
(vegetation) would be increased in height by approximately 10 to 15 feet along
Talbert Marsh and remain approximately the same density of trees. No increase in
vegetation height along Brookhurst Street is proposed, but the density of the trees
will increase to impede east directional views from viewpoints west of Plant No. 2.
In addition, the screening is planned to replace the existing 5- to 6-foot-high wall
with an 8-foot-high wall along the entire length of Plant No. 2 along Brookhurst
Street to improve security. Other security improvements may also include lighting
directed into Plant No. 2 and security cameras (PEIR, p. 2-14).
This project includes the demolition of the existing perimeter wall
(approximately 160 cubic yards), the excavation of soil for footings, the
construction of a new perimeter wall and additional landscaping including trees.
The type of wall and landscaping have not been determined at this time;
however, the wall would extend approximately 8 feet above ground along the
entire length of Plant No. 2 along Brookhurst Street. The demolition and
construction equipment needed for wall installation generally includes backhoes,
bulldozers and dump trucks. Approximately 10 to 20 workers would be required
during various phases of wall construction and landscaping. Excavated soils
would be reused onsite as backfill (PEIR, p. 2-25).
4.0 Description of the Modifications
Following the certification of the Final PEIR and approval of the 2017 BMP by OC San, detailed
designs have been initiated for the implementation of a capital improvement project that would
enable OC San to produce Class A Biosolids and diversify its biosolids program. The Area
proposed for the modifications is illustrated on Figure 2 and the revised project description for
each Project Modifications is described below. See Table 2 for a comparison of the PEIR
description and the modification analyzed in this Addendum.
4.1 TPAD Digester Facility Project Modifications
The TPAD Facility Project Modifications have been developed subsequent to the certification of
the PEIR for the following key components:
• Digester Feed Facility (DFF) and DFF odor control facility,
• Thermophilic digesters,
• Power Distribution Center M (DC-M)
• Class A batch tanks, and
• Sludge heating system and sludge cooling system
Addendum to the Final Program Environmental Impact Report 7 ESA / D201500626.02
for Biosolids Master Plan for Project No. P2-128 December 2022
Addendum to the Final Program EIR
TABLE 2
PER PROJECT ELEMENTS COMPARED TO P2-128 MODIFICATIONS
PEIR Project No.
and Name
Project Element
Description in the PEIRa
122-128 Addendum Modificationsa
P2-501 — Plant No. 2
Wall along
1,030 feet long screening
1,070 feet long, 8-foot (minimum) high concrete
Southwest Perimeter
Talbert Marsh
improvements or replacement
wall with subsurface foundation and soil
Screening
(extended from Brookhurst St wall)
improvements (e.g., cement deep soil mixing)
Wall along
4,325 feet long, 8-foot high
To be processed in the future under a different
Brookhurst St
project
Vegetation along
Exterior: N/A
Exterior: ground cover vegetation and/or vines
Talbert Marsh
Interior: increase in height by
Interior: trees within a raised planter behind the
approximately 10 to 15 feet along and
first 100 linear feet of the new perimeter wall
remain approximately the same
(near the corner of Brookhurst St and the Talbert
density of trees
Marsh Levee Access Road)
Vegetation along
Exterior: N/A
Exterior: ground cover vegetation and/or vines
Brookhurst St
Interior: no increase in height, but the
Interior: replace existing trees with box trees (to
density of the trees will increase
be planted in situ in the future after the
construction of the new wall along Brookhurst St)
Talbert Marsh
N/A
Minor realignment of approximately 600 linear
Levee Road
feet of the road/bike path to introduce a horizontal
Improvements
curve, allowing for a widened landscaping zone in
front of the perimeter wall in this area
Security
Lighting directed into Plant No. 2 and
Lighting directed into Plant No. 2, security
Improvements
security cameras
cameras, and motion sensors
P2-504 — TPAD
Digesters
Six thermophilic digesters, 110-foot
Five thermophilic digesters, 110-foot inner
Digester Facility at
diameter, 40 feet tall
diameter, 40 feet tall, with accommodations to
Plant No. 2
allow future addition of a 6th digester
Digester Control
22,400 square foot building with first
23,300 square foot below -grade gallery between
Building
floor and basement equipment gallery
the digesters with additional equipment at -grade
Sludge Heating
Sludge heating facilities including
Sludge heating facilities including 3 boilers and a
additional boilers and hydronic loop
connection to the CenGen hot water loop (to be
modifications
replaced with a 4th boiler in the future) in a 4,200
square foot building, 30.5 feet tall (single story)
Sludge Cooling
Sludge cooling facilities including a
Sludge cooling facilities including cooling tower
cooling water pump station,
facility and sludge cooling heat exchangers
ultrafiltration/nanofiltration facility, and
(exposed, no at -grade building)
sludge cooling heat exchangers
Power Building
3,150 square foot building, 21 feet tall
8,250 square foot building, 25 feet tall, with a
partial basement
Tunnels
2 new tunnels
2 new tunnels
P2-504A — Class A
Batch Tanks
Six 400,000-gallon tanks, 38 feet tall
Six 400,000-gallon tanks, 34 feet tall
Batch Tanks
Batch Tank
Pumps, heat exchangers, and grinders
Pumps, heat exchangers, and grinders located in
Ancillary
in an equipment control room adjacent
a below -grade gallery between the batch tanks
Equipment
to the six new tanks
with additional equipment at -grade (exposed, no
at -grade building)
P2-504B — Digester
DFF Tanks
Two octagonal 100,000-gallon DFF
Two cylindrical 70,000-gallon DFF blend tanks of
Feed Facility (DFF)
blend tanks of concrete construction,
concrete construction, 22-foot diameter and 27
30 feet wide and 33 feet tall
feet tall, and a 17,000-gallon mixing chamber
between the tanks
DFF Ancillary
3,850 square foot building, 25 feet tall,
2,900 square foot electrical building, 22 feet tall,
Facilities
containing tank mixing system,
with a basement level
grinders, pumps, and electrical control
7,000 square foot DFF Pump Pit containing tank
room
mixing system, grinders, and pumps
DFF Odor
2,500 square foot concrete pad for
1,000 square foot concrete pad for low -profile
Control Facility
carbon towers and bioscrubbers, 30
three -stage chemical scrubbers, 20 feet tall
feet tall
700 square foot at -grade odor control chemical
feed and storage facilities
a Dimensions and volumes listed are approximate. Facility heights shown under the P2-128 Addendum Modifications are referenced to the curb elevation in
front of Plant No. 2 at Brookhurst St (El. 10.5 ft NAVD88); heights listed in the 2017 BMP are assumed to be based on the same reference elevation.
Addendum to the Final Program Environmental Impact Report 0 ESA / D201500626.02
for Biosolids Master Plan for Project No. P2-128 December 2022
Class A Batch Tanks
- DFF Odor Control Faciltiy
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Distribution Center M
Sludge Heating and Cooling System
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Electrical Facility.
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OC San TPAD Digester Facility Project (P2-128) Addendum
Figure 2
Site Plan
Addendum to the Final Program EIR
Each of these components or equivalent treatment process facility was included in the project
analyzed in the PEIR. However, since certification of the PEIR, subsequent designs have been
developed for these facilities that comprise the Project Modifications evaluated in this
Addendum. Overall, the TPAD facilities would be constructed within the same area of Treatment
Plant No. 2 as identified in the PEIR. However, Figure 2 identifies the precise locations of each of
the components as determined during subsequent design efforts. The following sections describe
the proposed Project Modifications.
Digester Feed Facility and Digester Feed Facility Odor Control Facility
The project evaluated in the PEIR included two proposed DFF tanks that would be 33 feet wide
and 30 feet tall, with a volume of 100,000 gallons each, along with a building housing the tank
mixing system, digester feed pumps, and electrical control room. The Project Modifications now
call for two DFF tanks, approximately 22 feet in diameter and 27 feet tall, with a volume of
approximately 70,000 gallons each, along with a central mixing chamber. The DFF would be
located adjacent to the thermophilic digesters. The pair of DFF tanks would include cone bottoms
extending below grade. The subsequent Project designs also include a new digester electrical
building to power the new DFF (including the associated odor control and chemical area) and
Thermophilic Digesters C, D, and F (with space for future addition of electrical equipment for
Thermophilic Digester E). The Digester Feed and CDF Electrical Building would be located on
the east side of the thermophilic digesters (see Figure 2).
Similar to the project evaluated in the PEIR, the P2-128 DFF odor control facility would treat
foul air from the headspace of the new DFF tanks. The DFF tanks, mixing chamber, and
depressed pump pit would be constructed of cast -in -place concrete. Finally, a new chemical feed
and storage area would be constructed for the DFF odor control facility at the locations identified
in Figure 2, east of the DFF.
In summary, the Project Modification evaluated in this Addendum for this component includes
one additional DFF mixing chamber, a modified electrical building, and a new chemical feed and
storage area. Each of these new facilities would be located within the same footprint identified in
the PEIR for the project as shown in Figure 2.
Thermophilic Digesters
The project evaluated in the PEIR included six thermophilic digesters, with a below -grade gallery
between the digesters (Figure 3), that would be located west of the DFF and the DFF Odor
Control Facility. Subsequent designs have recommended reducing from six to five thermophilic
digesters (named Thermophilic Digesters A, B, C, D, and F). The subsequent design would
accommodate future construction of the 6tb digester (Thermophilic Digester E), but this digester
would not be constructed at this time. The thermophilic digesters would be partially buried and
would be constructed of cast -in -place concrete, including the foundation, floor, wall, and roof.
The PEIR evaluated digesters that would be 110 feet in diameter and 40 feet tall. In the
subsequent designs, each digester would be 110 feet in inner diameter and 40 feet tall (Figure 4).
Addendum to the Final Program Environmental Impact Report 10 ESA / D201500626.02
for Biosolids Master Plan for Project No. P2-128 December 2022
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OC San TPAD Digester Facility Project (P2-128) Addendum
Figure 3
Digester Plan View
SOURCE: Brown and Caldwell, 2022
MY NOTES:
ID THERMO DIG SLUDGE MIXER
D THERMO DIG DIGESTER GAS SEDIMENT TRAP
3D FLOW ELEMENT
ID DIGESTER GAS STANDPIPE
36" DIGESTER COVER ACCESS HATCH
8" SAMPLE HATCH EXTENSION TUBE
JOTE: MAX ELEVATION EL 50.5
OC San TPAD Digester Facility Project (P2-128) Addendum
Figure 4
Thermophilic Digesters Sections
Addendum to the Final Program EIR
In summary, the Project Modification evaluated in this Addendum for this component includes
the reduction from six to five thermophilic digesters of similar size. The facilities would be
located within the same footprint identified in the PEIR for the project as shown in Figure 2.
Power Distribution Center M
The PEIR identified the need for a new power building, but provided little detail. The subsequent
designs now call for a new Distribution Center M (DC-M) for P2-128 and the other biosolids
projects identified in BMP 2017. DC-M would be built west of the digesters parallel to
Brookhurst Street. This would allow distribution of 12 kilovolt (kV) power, stepped down to 480-
volt (V) service. DC-M would have a footprint of approximately 250 feet by 33 feet and would be
22.5 feet tall.
During construction of this newly proposed DC-M, the existing eucalyptus trees along Brookhurst
Street would be preserved if feasible. However, it is possible that the excavation for the
underground utilities and building foundation could impact the root system of the existing
eucalyptus trees. If it is determined that the construction activities are impacting the health of the
trees, the impacted eucalyptus trees would be removed to avoid future hazards of dead tree branches
or entire trees falling into the Plant or on the sidewalk along Brookhurst Street. If the trees are
removed, they would be replaced with containerized trees with crowns reaching 10 to 15 feet tall.
In summary, the Project Modification evaluated in this Addendum for this component includes a
new power Distribution Center to be located within the same footprint identified in the PEIR for
the project as shown in Figure 2.
Class A Batch Tanks
The Project described in the PEIR called for six Class A batch tanks, each to be 400,000 gallons
and to be 33.5 feet above the surrounding grade. The Project Modification calls for six Class A
batch tanks constructed to the north of the new digesters and east of the existing digesters (see
Figure 2). Each tank would be approximately 37 feet wide, 41 feet long, and approximately 34
feet above surrounding grade with a volume of 405,000 gallons. The new Class A batch tanks and
adjacent gallery would be completely constructed of cast -in -place reinforced concrete, with a
cast -in -place concrete roof and no internal column supports.
In summary, the Project Modification evaluated in this Addendum for this component includes a
similar facility that is slightly larger and taller, located within the same footprint identified in the
PEIR for the project as shown in Figure 2.
Sludge Heating System and Sludge Cooling System
The Project described in the PEIR called for a sludge cooling system comprised of a pump station
for secondary effluent cooling water treated with ultrafiltration/nanofiltration facilities prior to use
in heat exchangers to cool the thermophilic sludge. The modified project replaces this technology
with a cooling tower facility. As described in the PEIR, the new thermophilic digesters and batch
tanks would operate at higher temperatures than the existing digesters. The heat produced from
CenGen, the current heating facility, and the existing plant boilers would not be sufficient to
Addendum to the Final Program Environmental Impact Report 13 ESA / D201500626.02
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Addendum to the Final Program EIR
provide the required heating for the new process and therefore additional heating capacity would be
required. Since the certification of the PEIR, which included additional boilers and hydronic loop
modifications, subsequent designs have been refined to identify new boilers and a connection to the
CenGen hot water loop to maintain the thermophilic digesters and batch tanks at 135°F. These new
designs call for a new Boiler Facility building to be constructed north of the proposed DFF, near the
new batch tanks (see Figure 2). The Boiler Facility would be constructed with cast -in -place concrete
walls and would be approximately 102 feet by 43 feet (excluding the exterior stairs on the east side
of the building) and 29 feet tall. The facility would be above surrounding grade with adequate space
for the routing of mechanical piping and would feature four rollup doors, one for each boiler
(including one future boiler). Each rollup door would be approximately 12 feet to 14 feet wide and
16 feet tall. The Boiler Facility would be sized to accommodate four boilers; however, three new
hot water boilers would initially be constructed as well as heat exchangers to capture heat from OC
San's existing CenGen system. The Boiler Facility has an adjacent, exterior chemical storage area,
which would serve both the Boiler Facility and Cooling Tower Facility, on the south end of the
building that is approximately 30 feet by 10 feet.
To cool the sludge, a cooling system would be provided that consists of sludge cooling heat
exchangers (HEXs), a cooling water loop, and a method to reject heat from the system. The
sludge cooling heat exchangers would transfer heat from the thermophilic sludge to the cooling
water loop thereby raising the return temperature in the cooling water. This cooling system has
been developed since the certification of the PEIR and would replace the technology and
approach descried in the PEIR. Two cooling towers would be provided to generate cool water to
meet the cooling demands. The cooling system would consist of two separate facilities: (1) the
cooling towers and primary cooling water pumps, and (2) the sludge cooling HEXs located
between the batch tanks. The cooling tower facility would consist of a reinforced concrete slab to
accommodate the cooling towers. The cooling water recirculation pumps would be located in the
tunnel system adjacent to the Batch Tanks. The two cooling towers would have a footprint of
approximately 43 feet by 32 feet and would be approximately 30 feet tall.
In summary, the Project Modification evaluated in this Addendum for this component includes a
new boiler facility and cooling towers replacing a proposed filtration facility to be located within
the same footprint identified in the PEIR for the project as shown in Figure 2.
Construction
Construction methods employed for the new TPAD facilities would be similar to the assumptions
included in the PEIR including the excavation of soil to establish foundations and the
construction of digester tanks, power building, electrical control rooms, batch tanks, DFF, and
cooling towers. The demolition and construction equipment needed for the project modification
includes scrapers, backhoes, loaders, dozers, dump trucks, trenchers, and cranes. The paving
equipment needed for the modification includes a grader, loader, and paver.
The PEIR noted that approximately 7 to 120 workers would be needed during construction of the
TPAD facility. The modified project would require approximately 40 to 80 workers at a time
during various stages of construction with a peak crew size of 100 to 120 field staff. This is well
within the assumptions of the PEIR. A minor amount of the excavated soils would be reused
Addendum to the Final Program Environmental Impact Report 14 ESA / D201500626.02
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Addendum to the Final Program EIR
onsite as backfill, and there would be approximately 97,200 cubic yards that would be exported.
The PEIR estimated up to 121,000 cubic yards of export. The project does not require importing
of soils. Construction would last for approximately 89 months, which includes 32 months for
commissioning and start-up.
One construction method has been added that was not evaluated in the PEIR: soil improvements
including cement deep soil mixing (CDSM) utilized to support foundations. Due to the large area
covered by the thermophilic digester complex, the CDSM activities are anticipated to require up
to two concurrent crews to expedite the schedule. Approximately 15 to 25 workers would be
required at a time during various stages of CDSM activities. Four field staff per rig would be
required during the drilling activities and 12 field staff would be required during
mobilization/demobilization. CDSM activities would last for approximately 22 months; however,
construction may not occur consecutively. The concrete batch plant will require sand, gravel, and
Portland cement deliveries to the site to produce the concrete. Rebar and other supplies may also
be delivered to the site. The material deliveries associated with the concrete batch plant and
related supplies under the Project Modifications is conservatively estimated to add up to an
additional 600 delivery trucks, or approximately 4 to 5 trucks per day over the 125 work days, on
top of those accounted for in the PEIR.
In summary, the Project Modification evaluated in this Addendum for construction methods
includes the use of CDSM methods within the same footprint identified in the PEIR for the
project as shown in Figure 2.
4.2 South Perimeter Wall and Soil Improvements Project
Modifications
The PEIR identified the need to modify the perimeter screening wall on Brookhurst Street and along
the southern border of the Plant including the maintenance or replacement of 15-foot-tall screening
vegetated berms. However, since the certification of the PEIR, subsequent project designs have been
developed to remove the existing vegetated berms and in their place install an 8-foot-tall perimeter
wall along the southern boundary of the Plant. The new wall would extend 1,030 feet from the
southwest corner of the existing Activated Sludge Plant Secondary Clarifiers to Brookhurst Street.
The new wall would be constructed along a similar alignment to the existing fence line, which is
adjacent to the bike path that runs parallel to the Talbert Marsh. The new wall is planned to have a
"wave" top feature with the height varying between 8 and 11 feet above ground surface. There would
be a chamfer where the Talbert Marsh and Brookhurst walls meet in the southwest corner of Plant
No. 2, which would have a height of up to 12-feet above ground surface. The project would include
planting pine trees behind the chamfer. The new wall will act in conjunction with the existing Talbert
Marsh Levee to protect the Plant from a 100-year flood adjusted for the 2070 projections of sea level
rise as identified in the OC San Climate Resiliency Study, Project No. SP-152 (2019). The height of
the wall is not designed for flood water elevations associated with a design tsunami; however, the
wall will be designed to not fail during a tsunami event.
To fortify the wall, the structure would require deep soil mixing to 50 to 75 feet below ground
surface and cast in drilled hole (CIDH) concrete piles to approximately 40 feet below ground
Addendum to the Final Program Environmental Impact Report 15 ESA / D201500626.02
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Addendum to the Final Program EIR
surface. Additionally, cement deep soil mixing (CDSM) would be implemented in a 45-foot-wide
strip (to a depth of 35 to 75-feet below ground surface) parallel to the Talbert Marsh wall to
provide lateral spread mitigation and to support the wall foundation. In locations where CDSM is
not feasible due to site constraints, jet grouting or other soil improvement techniques would be
used. The CDSM construction process is anticipated to utilize a temporary onsite concrete batch
plant that will require sand, gravel, and Portland cement deliveries to the site to produce the
concrete. Rebar and other supplies may also be delivered to the site. The material deliveries
associated with the concrete batch plant and related supplies under the Project Modifications is
conservatively estimated to add up to 600 delivery trucks, or approximately 4 to 5 trucks per day
over the 125 work days, on top of those accounted for in the PEIR. Therefore, additional delivery
truck emissions will occur under the Project Modifications beyond what was analyzed in the PEIR.
A portion of the southern perimeter wall would be constructed beyond OC San's property line,
within the Orange County Flood Control District's property. OC San will coordinate with Orange
County Flood Control on an easement and encroachment permit prior to constructing the wall
improvements. During construction, the existing bike path will be narrowed from two 6-foot-wide
lanes to a single 6-foot-wide lane temporarily (Figure 5). An 18-inch by 18-inch sign will be
provided on each side of the bike path, warning that the path narrows at the Brookhurst Street
bike path entrance. Temporary railing with fencing will be provided along the perimeter wall
construction area. The gate and wall located near Brookhurst Street will be removed. In addition,
new pavement will be laid starting from the Brookhurst Street entrance and will end near the
southern edge of the wall construction area.
After the Project Modifications are completed, the bike path will be restored to two 6-foot-wide
travel lanes (Figure 5). Previous designs had included 10- to 15-foot-high vegetation along the
Talbert Marsh wall; however, under the proposed modification the wall would have a
combination of various shrubs and ground cover, including California Sagebrush, Coyote Brush,
and California Buckwheat, running adjacent to the existing bike path. The low-lying vegetation is
designed to reduce the opportunity for predatory raptors to perch near the Talbert Marsh.
During the temporary closure of the Talbert Marsh bike path, a bike path detour plan will be
developed and posted at the either side of the Talbert Marsh bike path. As shown on Figure 6, the
bike path detour would use the sidewalk along the Brookhurst Street bridge crossing the
intersection of Brookhurst Street and Pacific Coast Highway and connecting to the Huntington
Beach bike path. Recreational users using the Santa Ana River Trail would also be detoured south
past the Talbert Marsh bike path under the Pacific Coast Highway to the Huntington Beach bike
trail. The duration of the closure will be determined during construction and may last two to six
weeks, which may or may not be continuous. Other shorter duration closures may also be
required during construction activities.
In summary, the Project Modification evaluated in this Addendum for the perimeter screening
wall component of the project includes the installation of an 8-foot-tall wall along the Plant's
southern border and demolition of the existing 15-foot-high vegetated berms, the need to
encroach temporarily within the County -owned bike path during construction, and the use of
CDSM and CIDH pile construction methods.
Addendum to the Final Program Environmental Impact Report 16 ESA / D201500626.02
for Biosolids Master Plan for Project No. P2-128 December 2022
Before Construction
in, is'
Limits of Impacts
AnnaCross-section Location
SOURCE: ESA, 2022
ESA
During Construction
Shoulder
Bike Path
Construction Zone
8'
Construction
Fence
Post Construction
Drill Rig
Structure
OC San TPAD Digester Facility Project (P2-128) Addendum
Figure 5
Construction Stages
SOURCE: ESA, 2022; Googie Earth, 2022 OC San TPAD Digester Facility Project (P2-128) Addendum
Figure 6
Bike Path Detour
ESA
Addendum to the Final Program EIR
5.0 Evaluation of Environmental Impacts
Aesthetics
Issues (and Supporting Information Sources):
Yes
No
I. AESTHETICS — Would project modifications, changed circumstances,
or new information substantially increase the severity of significant
impacts identified in the previous CEQA document or result in new
significant impacts that could:
a) Have a substantial adverse effect on a scenic vista?
b) Substantially damage scenic resources, including, but not limited to, trees,
rock outcroppings, and historic buildings within a state scenic highway?
c) In non -urbanized areas, substantially degrade the existing visual character
or quality of public views of the site and its surroundings? (Public views
are those that are experienced from publicly accessible vantage point). If
the project is in an urbanized area, would the project conflict with
applicable zoning and other regulations governing scenic quality?
d) Create a new source of substantial light or glare which would adversely
affect daytime or nighttime views in the area?
Discussion
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Have a substantial adverse effect on a scenic vista?
TPAD Digester Facility
The PEIR evaluated impacts to scenic vistas from construction of the project within the
southwest corner of Plant No. 2 in Section 3.1-1. The PEIR noted on p. 3.1-15 that the
project area is located within the City of Huntington Beach's Coastal Zone and is
adjacent to visual resources, facilities, and assets that contribute to the aesthetic character
of the Coastal Zone. The PEIR concluded that the construction of TPAD Digester Facility
would be visible but would not substantially affect the scenic resources from PCH. The
PEIR stated that construction equipment including cranes, scaffolding, and other tall
equipment would be temporarily visible. The proposed modifications to the TPAD
facilities include the addition of process facilities within the plant site. The proposed
modifications would require similar equipment during the temporary construction period,
but would include CDSM and CIDH pile methods requiring drill rigs. The appearance of
the drill rigs will be similar to the cranes identified and evaluated in the PEIR. As a
result, the new construction methods required by the Project Modifications will not alter
the conclusions of the PEIR. Therefore, the modifications would not result in any new
construction impacts to scenic vistas compared with the conclusions in the PEIR.
The PEIR also evaluated long-term impacts to scenic vistas from operation of the project
once the new facilities are constructed. The PEIR stated that the new TPAD facilities
would be 40 feet tall and visible from neighboring public views. The PEIR concluded that
the construction of digesters within the southwest corner of Treatment Plant No. 2 will
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alter public views of the Plant site from Brookhurst Street and Pacific Coast Highway
(PCH), as well as from longer distances to the northeast on the Costa Mesa bluffs, but
would not block views of scenic vistas. The PEIR concluded that the new facilities would
be consistent with the other facilities on the treatment plant and would not be taller. The
existing digesters are up to 40 feet in height, similar to the proposed project (PEIR p. 3.1-
3). The PEIR concluded that the new digesters would result in less than significant impacts
to scenic vistas since the treatment plant is already visible to these areas.
The proposed Project Modifications to the TPAD facilities would be 40 feet tall at the roof
level with an additional 10 feet of appurtenant equipment. The additional roof -top
equipment was not expressly identified in the PEIR. However, the Local Coastal Plan
(LCP) allows for buildings up to 40 feet in height with appurtenant facilities on the roof
extending an additional 10 feet requiring a conditional use permit (CUP). As a result, the
Project Modifications would be consistent with the LCP with an approved CUP. Similar to
the project evaluated in the PEIR, the proposed 40-foot-tall digesters will be in the same
location and views of the digesters will be visible from public streets such as Brookhurst
Street and the PCH. As a result, the Project Modifications would be consistent with the
assumptions in the PEIR and would not alter the conclusions of the PEIR.
South Perimeter Wall
The PEIR evaluated the perimeter screening on the southern border of the Plant that
included revised landscaping, maintaining vegetation up to 15 feet high. The proposed
Project Modifications will result in a new wall on the southern edge of the treatment plant
instead of the proposed vegetated berm. Construction of the new wall will require CDSM
methods requiring soil -mixing rigs that could be up to approximately 50 feet tall. These
rigs were not expressly identified in the PEIR. However, the appearance of the rigs will
be similar to the cranes identified and evaluated in the PEIR. As a result, the new
construction methods required by the Project Modifications will not alter the conclusions
of the PEIR. The temporary construction equipment required for the Project
Modifications will have a less than significant impact to scenic views.
Once constructed, the new wall will be visible from public views along Brookhurst, the
bike path, and PCH. The new wall will partially obscure views of the treatment plant but
to a lesser extent than assumed in the PEIR. Figure 7 shows the current condition of the
Plant No. 2 site and a simulation showing the new digesters and wall. Once constructed,
the new wall will be visible from both Brookhurst Street and PCH. The replacement of
the existing chain link fence with a decorative wall and landscaping along the southern
perimeter of the Plant will change the appearance of the southern edge of the treatment
plant, but it will still partially obscure the existing industrial treatment facility. Scenic
vistas will not be blocked, and the new facility will resemble the existing treatment plant
infrastructure. As a result, the Project Modifications will not alter the conclusions of the
PEIR and will not have a substantial adverse effect on scenic vistas.
Addendum to the Final Program Environmental Impact Report 20 ESA / D201500626.02
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Pre -Construction
0 T-
O _
Q
Post -Construction
0
SOURCE: Brown and Caldwell, 2022
OC San TPAD Digester Facility Project (P2-128) Addendum
Figure 7
Pre -and Post -Construction
r ESA
J
Addendum to the Final Program EIR
This finding is consistent with the impact determination in the PEIR; the Project
Modifications will not result in a new significant impact or substantially increase the
severity of a previously identified significant impact. No new mitigation measures are
required.
b) Substantially damage scenic resources, including, but not limited to, trees, rock
outcroppings, and historic buildings within a state scenic highway?
TPAD Digester Facility
Based on a review of the California Department of Transportation (Caltrans) List of
Scenic Highways, the PEIR concluded that the project area is not located along a State
Scenic Highway (Caltrans, 2022). A segment of State Route 1, PCH, is approximately
0.50-mile south of Plant No. 2 along the Pacific Ocean coastline. PCH is an Eligible
Scenic Highway but is not officially designated.
The modifications proposed for the TPAD facilities include the addition of new structures
within the treatment plant that will not be visible from the exterior. The height of the new
digesters wound not change compared with the description in the PEIR. Construction of
the TPAD facilities will be as described in the PEIR, with the addition of CDSM
methods. These new construction methods would include drill rigs. Therefore,
construction of the TPAD facilities will not alter the conclusions of the PEIR.
Once constructed, the TPAD facilities will be visible from portions of PCH. However,
the digesters will be similar in size and mass to the project analyzed in the PEIR, and
would not be within a state designated scenic highway. Since no state scenic highway
occurs in the area, the proposed TPAD modifications will not alter the conclusions of
the PEIR.
South Perimeter Wall
The Project Modifications include the use of CDSM and CIDH pile construction methods
requiring drill rigs. However, since the site is not near a State Designated Scenic
Highway, the Project Modifications would not alter the conclusions in PEIR.
Once constructed, the modifications to the southern perimeter will alter the view by
adding a new wall that will include thematic architectural treatments. Since no State
Scenic Highway occurs in the area, the perimeter wall modifications will not alter the
conclusions of the PEIR. This finding is consistent with the impact determination in the
PEIR; no new significant impacts will occur, and no new mitigation measures are
required.
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Addendum to the Final Program EIR
c) In non -urbanized areas, substantially degrade the existing visual character or
quality of public views of the site and its surroundings? (Public views are those that
are experienced from publicly accessible vantage point). If the project is in an
urbanized area, would the project conflict with applicable zoning and other
regulations governing scenic quality?
TPAD Digester Facility
The PEIR evaluated impacts to visual character from construction of the project within
the southwest corner of Plant No. 2 in Section 3.1-3 of the PEIR. The PEIR noted on p.
3.1-15 that the project area is located within the City of Huntington Beach's Coastal Zone
and is adjacent to visual resources, facilities, and assets that contribute to the aesthetic
character of the Coastal Zone. The PEIR concluded that the construction of TPAD
Digester Facility would be visible but would not substantially affect the scenic resources
from PCH. The PEIR stated that construction equipment including cranes, scaffolding,
and other tall equipment would be temporarily visible during project construction.
The proposed modifications to the TPAD facilities include the addition of process
facilities within the plant site. Construction of these facilities will require the same types
of equipment assumed in the PEIR analysis with the addition of CDSM and CIDH pile
methods. The appearance of the drill rigs will be similar to the cranes identified and
evaluated in the PEIR, but less tall (up to approximately 40 feet). As a result, the new
construction methods required by the Project Modifications will not alter the conclusions
of the PEIR. Therefore, the modifications will not result in any new impacts to visual
character compared with the conclusions in the PEIR.
The PEIR also evaluated long-term impacts to visual character once the new facilities are
constructed. The PEIR stated that the new TPAD facilities would be 40 feet tall and
visible from neighboring public views. The PEIR concluded that the construction of
digesters within the southwest corner of Treatment Plant No. 2 will not alter the visual
character of the Plant site from Brookhurst Street and Pacific Coast Highway (PCH)
since the treatment plant is an existing development. The PEIR concluded that the new
facilities would be consistent with the other facilities on the treatment plant and would
not be taller. The PEIR concluded that the new digesters would result in less than
significant impacts to visual character since the treatment plant is an existing facility.
The proposed modifications to the TPAD design include the addition of new facilities
within the plant. The largest proposed structures, the digester tanks will be approximately
40 feet high with 10 feet of appurtenances for a total height of approximately 50 feet
from curb elevation on Brookhurst Street. The PEIR concluded that the proposed new
digesters will not be taller than existing facilities on the site, which are approximately 40
feet tall. The Proposed Modifications provide for a roof height of 40 feet consistent with
the PEIR. However, appurtenant equipment on the roof will require a CUP from the City
of Huntington Beach. The LCP allows for buildings up to 40 feet in height with
appurtenant facilities on the roof extending an additional 10 feet requiring a CUP. As a
result, the Project Modifications would be consistent with the LCP with an approved
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Addendum to the Final Program EIR
CUP. Similar to the project evaluated in the PEIR, the proposed 40-foot tall digesters will
be in the same location and views of the digesters will be visible from public streets such
as Brookhurst Street and the PCH. The height of the buildings will not block views and
will be consistent with the LCP. Therefore, the modifications will not alter the
conclusions of the PEIR.
The new DC-M building will require excavation to underground the utilities and to
construct the building foundation. This excavation would be close to the existing
eucalyptus trees that currently line the western plant boundary and could impact the root
system of the existing trees. The impacted eucalyptus trees may be removed to avoid
future hazards of dead tree branches or entire trees falling into the Plant or on the
sidewalk along Brookhurst Street. If the trees are removed, they would be replaced with
containerized trees with crowns reaching 10 to 15 feet tall. Since the replacement trees
would provide visual screening function, no impacts to visual character would occur.
South Perimeter Wall
The PEIR evaluated the perimeter screening that included revised landscaping. The
proposed modifications would result in a new wall on the southern edge of the treatment
plant. Construction of the new wall will require drilling rigs that could be up to 40 feet
tall. These drill rigs were not expressly identified in the PEIR. However, the appearance
of the drill rigs will be similar to the cranes identified in the PEIR. The temporary drill
rigs, similar to other construction equipment, would only be onsite temporarily. As a
result, the new construction methods will not alter the conclusions of the PEIR.
Temporary construction equipment will have a less than significant impact to visual
character.
Once constructed, the new wall will be visible from public views from the Brookhurst
Street, the bike path, and PCH. Figure 7 shows the current condition of the Plant No. 2
site and a simulation showing the new digesters and wall. Once constructed, the new
digesters and wall will be visible from both Brookhurst Street and PCH. The replacement
of the existing chain link fence with a decorative wall and landscaping along the southern
perimeter of the Plant will change the appearance of the southern edge of the treatment
plant, but will not add new structures that will be inconsistent with the existing visual
character. The wall will partially obscure the industrial treatment facility, similar to the
existing conditions. As a result, the new perimeter wall designs will not have a substantial
adverse effect on visual character.
This finding is consistent with the impact determination in the PEIR; the Project
Modifications will not result in a new significant impact or substantially increase the
severity of a previously identified significant impact. No new mitigation measures are
required.
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Addendum to the Final Program EIR
d) Create a new source of substantial light or glare which would adversely affect
daytime or nighttime views in the area?
TPAD Digester Facility
The PEIR concluded in Section 3.1.3 (p. 3.1-24) that construction of the proposed project
will take place during the hours of 7:00 a.m. and 8:00 p.m., Monday through Friday. No
overnight construction will occur; however, construction could occur during time of
darkness due to the change in season that would require temporary lighting. In addition,
construction equipment would have the potential to create a temporary new lighting and
source of glare to the project area; however, once the construction is completed the
equipment would be removed eliminating any long-term light or glare impacts. The
modifications to the construction of the new TPAD facilities will not alter this
assessment.
Once constructed, the PEIR noted that new lighting would be installed within the Plant to
illuminate the new facilities. The proposed modifications will not alter this design
feature. As required by PEIR mitigation measures AES-1 and AES-2, all lighting will be
directed downwards to prevent light spillage off site. Therefore, the proposed
modifications will be consistent with the analysis in the PEIR with respect light and
glare. This finding is consistent with the impact determination in the PEIR; no new
significant impacts will occur, and no new mitigation measures are required.
South Perimeter Wall
The PEIR described that construction activities would be conducted during daytime
hours. Construction of the modified perimeter wall would adhere to this requirement.
Therefore, nighttime lighting would not result in new impacts on the southern edge of the
plant site.
Once constructed, no new lights would be installed on the outer wall. New lights within
the treatment plant would comply with lighting design requirements, consistent with the
analysis in the PEIR and mitigation measures AES-1 and AES-2. As a result, the
perimeter wall modifications will be consistent with the impact determination in the
PEIR; no new significant impacts will occur, and no new mitigation measures are
required.
Mitigation Measures from the 2017 BMP PER
AES-1: All new permanent exterior lighting associated with proposed program
components shall be shielded and directed downward to avoid any light intrusion to
surrounding uses.
AES-2: Development of the proposed program and associated facilities shall comply
with existing and future lighting ordinances for the cities of Fountain Valley and
Huntington Beach.
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Addendum to the Final Program EIR
Summary of Potential Effects on Aesthetics
The proposed modifications will not result in new significant environmental effects or result in a
substantial increase in the severity of previously identified significant effects with respect to
aesthetics. No further environmental review is required. (Public Resources Code § 21166; CEQA
Guidelines § 15162.).
References
California Department of Transportation (Caltrans), 2022. Officially Designated Scenic Highway,
Orange County. Available at:
http://www.dot.ca.gov/hq/LandArch/16_livability/scenic highways/, accessed August 30,
2022.
City of Huntington Beach, 2011. City of Huntington Beach General Plan, Coastal Element.
Available online at:
https://www.huntingtonbeachca.gov/files/users/planning/Coastal_Elem_Tech Synop.pdf,
accessed August 30, 2022.
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Addendum to the Final
EIR
Agriculture and Forestry Resources
Issues (and Supporting Information Sources): Yes No
II. AGRICULTURE AND FORESTRY RESOURCES —
In determining whether impacts to agricultural resources are significant
environmental effects, lead agencies may refer to the California
Agricultural Land Evaluation and Site Assessment Model (1997) prepared
by the California Dept. of Conservation as an optional model to use in
assessing impacts on agriculture and farmland. In determining whether
impacts to forest resources, including timberland, are significant
environmental effects, lead agencies may refer to information compiled by
the California Department of Forestry and Fire Protection regarding the
state's inventory of forest land, including the Forest and Range
Assessment Project and the Forest Legacy Assessment project; and forest
carbon measurement methodology provided in Forest Protocols adopted
by the California Air Resources Board. Would project modifications,
changed circumstances, or new information substantially increase the
severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Convert Prime Farmland, Unique Farmland, or Farmland of Statewide
❑
Importance (Farmland), as shown on the maps prepared pursuant to the
Farmland Mapping and Monitoring Program of the California Resources
Agency, to non-agricultural use?
b) Conflict with existing zoning for agricultural use, or a Williamson Act
❑
❑X
contract?
c) Conflict with existing zoning for, or cause rezoning of, forest land (as
❑
defined in Public Resources Code section 12220(g)), timberland (as
defined by Public Resources Code section 4526), or timberland zoned
Timberland Production (as defined by Government Code section
51104(g))?
d) Result in the loss of forest land or conversion of forest land to non -forest
❑
use?
e) Involve other changes in the existing environment which, due to their
❑
❑X
location or nature, could result in conversion of Farmland, to non-
agricultural use or conversion of forest land to non -forest use?
Discussion
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Convert Prime Farmland, Unique Farmland, or Farmland of Statewide Importance
(Farmland), as shown on the maps prepared pursuant to the Farmland Mapping
and Monitoring Program of the California Resources Agency, to non-agricultural
use?
TPAD Digester Facility and South Perimeter Wall
The Initial Study prepared for the PEIR concluded that no agricultural resources exist
within or surrounding Plant No. 2. The PEIR determined that the project would result in
no impact to the resource and did not need to be evaluated any further in the PEIR.
The proposed modifications to the TPAD Digester Facility and perimeter wall involve
facility components within the same approximate footprint assumed in the PEIR.
Therefore, the proposed modifications will not alter the conclusions of the PEIR. There is
Addendum to the Final Program Environmental Impact Report 27 ESA / D201500626.02
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Addendum to the Final Program EIR
no Prime Farmland, Unique Farmland, or Farmland of Statewide Importance located
adjacent to the project area (DOC 2022a). No new significant impacts will occur, and no
new mitigation measures are required.
b) Conflict with existing zoning for agricultural use, or a Williamson Act contract?
TPAD Digester Facility and South Perimeter Wall
The Initial Study prepared for the PEIR concluded that no agricultural uses or
Williamson Act parcels exist within or surrounding Plant No. 2. The PEIR determined
that the project would result in no impact to the resource and did not need to be evaluated
any further in the PEIR.
The proposed modifications to the TPAD Digester Facility and perimeter wall involve
facility components within the same approximate footprint assumed in the PEIR.
Therefore, the proposed modifications will not alter the conclusions of the PEIR. There
are no agricultural lands or Williamson Act parcels near the project site. No new
significant impacts will occur, and no new mitigation measures are required.
c) Conflict with existing zoning for, or cause rezoning of, forest land (as defined in
Public Resources Code section 12220(g)), timberland (as defined by Public
Resources Code section 4526), or timberland zoned Timberland Production (as
defined by Government Code section 51104(g))?
TPAD Digester Facility and South Perimeter Wall
The Initial Study prepared for the PEIR concluded that no forest or timberland resources
exist within or surrounding Plant No. 2. The PEIR determined that the project would
result in no impact to the resource and did not need to be evaluated any further in the
PEIR.
The proposed modifications to the TPAD Digester Facility and perimeter wall involve
facility components within the same approximate footprint assumed in the PEIR.
Therefore, the proposed modifications will not alter the conclusions of the PEIR. No new
significant impacts will occur, and no new mitigation measures are required.
d) Result in the loss of forest land or conversion of forest land to non -forest use?
TPAD Digester Facility and South Perimeter Wall
The Initial Study prepared for the PEIR concluded that no forest or timberland resources
exist within or surrounding Plant No. 2. The PEIR determined that the project would
result in no impact to the resource and did not need to be evaluated any further in the
PEIR.
The proposed modifications to the TPAD Digester Facility and perimeter wall involve
facility components within the same approximate footprint assumed in the PEIR.
Therefore, the proposed modifications will not alter the conclusions of the PEIR. No new
significant impacts will occur, and no new mitigation measures are required.
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for Biosolids Master Plan for Project No. P2-128 December 2022
Addendum to the Final Program EIR
e) Involve other changes in the existing environment which, due to their location or
nature, could result in conversion of Farmland, to non-agricultural use or
conversion of forest land to non -forest use?
TPAD Digester Facility and South Perimeter Wall
The Initial Study prepared for the PEIR concluded that no agricultural, forest or
timberland resources exist within or surrounding Plant No. 2. The PEIR determined that
the project would result in no impact to the resource and did not need to be evaluated any
further in the PEIR.
The proposed modifications to the TPAD Digester Facility and perimeter wall involve
facility components within the same approximate footprint assumed in the PEIR.
Therefore, the proposed modifications will not alter the conclusions of the PEIR. No new
significant impacts will occur, and no new mitigation measures are required.
Summary of Potential Effects on Agricultural and Forestry Resources
The proposed modifications will not result in new significant environmental effects, or result in a
substantial increase in the severity of previously identified significant effects, with respect to
agricultural and forestry resources. No further environmental review is required. (Public
Resources Code § 21166; CEQA Guidelines § 15162.).
References
California Department of Conservation (DOC), 2022a. Important Farmland Finder. Available
online at: https:Hmaps.conservation.ca.gov/DLRP/CIFF/, accessed on August 30, 2022.
California Department of Conservation (DOC), 2022b. Williamson Act Contract Land. Available
online at:
https://planning.lacity. org/eir/HollywoodCenter/Deir/ELDP/(E)%20Initial%2OStudy/Initial
%20Study/Attachment%20B%2OReferences/California%2ODepartment%20ot%2OConsery
ation%20Williamson%2OMap%202016.pdf, accessed on August 30, 2022.
City of Huntington Beach, 2017. City of Huntington Beach General Plan: General Plan
Designations. Available online at:
https://www.huntingtonbeachca.gov/files/users/planning/General-Plan-Map.pdf, accessed
on August 30, 2022.
Addendum to the Final Program Environmental Impact Report 29 ESA / D201500626.02
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Addendum to the Final Program EIR
Air Quality
Issues (and Supporting Information Sources):
AIR QUALITY —
Where available, the significance criteria established by the applicable air
quality management district or air pollution control district may be relied
upon to make the following determinations. Would project modifications,
changed circumstances, or new information substantially increase the
severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Conflict with or obstruct implementation of the applicable air quality plan?
b) Result in a cumulatively considerable net increase of any criteria pollutant
for which the project region is non -attainment under an applicable federal
or state ambient air quality standard?
c) Expose sensitive receptors to substantial pollutant concentrations?
d) Result in other emissions (such as those leading to odors) adversely
affecting a substantial number of people?
Discussion
Yes No
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Conflict with or obstruct implementation of the applicable air quality plan?
TPAD Digester Facility
The PEIR evaluated the construction emissions of each BMP project, including the
TPAD facility. The combined emissions of all construction activities for the BMP
projects exceeded significance thresholds for NOx. As a result, the PEIR adopted
Mitigation Measure AQ-1 regarding mobile off -road construction equipment. .
The proposed TPAD facility modifications include a construction method not anticipated in
the PEIR. A temporary on -site concrete batch plant will be installed to support the CDSM
foundation construction methods. The batch plant will be electric -powered (e.g., mixing,
conveyors, etc.), which will result in minimal and temporary electricity demand, and will
not result in on -site combustion -related air pollutant emissions. Emissions from the on -site
concrete batch plant will be associated with fugitive dust from the production and
conveyance of concrete. The concrete batch plant under the proposed modifications would
be used for approximately 12 months (approximately six months of soil improvement work
for the perimeter wall area and approximately six 6 months for the soil improvement work
for the TPAD area) and produce up to approximately 4,000 cubic yards.
The concrete batch plant will require sand, gravel, and Portland cement deliveries to the
site to produce the concrete. Rebar and other supplies may also be delivered to the site.
The PEIR accounted for 600 delivery trucks during construction. The material deliveries
associated with the concrete batch plant and related supplies under the Project
Modifications is conservatively estimated to add up to 600 delivery trucks, or
approximately 4 to 5 trucks per day over the 125 work days, on top of those accounted
Addendum to the Final Program Environmental Impact Report 30 ESA / D201500626.02
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Addendum to the Final Program EIR
for in the PEIR. Therefore, additional delivery truck emissions will occur under the
Project Modifications beyond what was analyzed in the PEIR. As discussed in Item (b)
below, the additional emissions would not cause or contribute to an exceedance of the
applicable SCAQMD significance thresholds.
Construction of the Project Modifications would require approximately 40 to 80 workers
at a time during various stages of construction with a peak crew size of approximately
100 to 120 field staff. The PEIR evaluated a maximum of 120 construction workers per
day for this component and analyzed a worse -case day including cumulative trips from
multiple BMP projects. Therefore, the Project Modifications would result in the same
maximum daily worker vehicle commutes as the PEIR. No additional worker vehicle
commute emissions would occur as a result of the Project Modifications, and direct or
cumulative emissions would not exceed vehicle emissions assumed in the PEIR.
Once constructed, the Project Modifications would generate operational emissions that
will not exceed the SCAQMD significance thresholds. As discussed in Section 3.2, Air
Quality, of the PEIR, the project will increase the energy efficiency of the facilities, and
as such, will not generate a net demand for energy that cannot be supported by the
existing CenGen facility at Plant No. 2. The Project Modifications will increase the
number of boilers by one compared to the PEIR (i.e., the Project Modifications call for
three boilers with a fourth in the future compared to the PEIR which evaluated two
boilers with a third in the future). The primary fuel source for the boilers is intended to be
digester gas. Natural gas would be supplemented only if sufficient digester gas is not
available; however, it is not known if or when this would be needed. Only two of the new
boilers would operate at a time, and would do so in a lead/lag fashion, responding to
heating demands that vary throughout the day and by season. Since the primary fuel
source would be digester gas, emissions of digester gas are accounted for in the PEIR.
During operations, the Project Modifications would add approximately 30 additional
workers beyond what was assumed in the PEIR. As discussed in Item (b) below, the
additional work vehicle trips would not cause or contribute to an exceedance of the
applicable SCAQMD significance thresholds. The approximately 30 additional workers
would also not contribute substantially to vehicle miles traveled (VMT) (refer to Section
XVII, Transportation, Item (b), below, which determined that the Project Modifications
would not result in substantial VMT increases). As such, the Project Modifications will
not conflict with the VMT reduction targets and growth projections of the Southern
California Association of Governments (SCAG) Regional Transportation
Plan/Sustainable Communities Strategy (RTP/SCS). Therefore, the operational activities
associated with the proposed project modifications will result in a less than significant
impact on the implementation of the AQMP. This finding is consistent with the impact
determination in the PEIR; no new significant impacts will occur, and no new mitigation
measures are required.
Addendum to the Final Program Environmental Impact Report 31 ESA / D201500626.02
for Biosolids Master Plan for Project No. P2-128 December 2022
Addendum to the Final Program EIR
South Perimeter Wall
The PEIR concluded that the perimeter screening project would result in minimal
emissions. The new perimeter wall foundation system will require deep soil mixing that
was not anticipated in the PEIR. The new construction method will install cast in drilled
hole (CIDH) piles to approximately 40-feet below ground surface. Additionally, deep soil
mixing will be implemented in a 45-foot-wide strip (to a depth of 35-75 feet below
ground surface) parallel to the Talbert Marsh wall to provide lateral spread mitigation and
to support the wall's foundation. In locations where deep soil mixing is not constructible,
jet grouting techniques may be used to accomplish the ground improvements.
The proposed modifications to the existing south perimeter screening are anticipated to
require a temporary on -site concrete batch plant and up to three bore/drill rigs, which
were not considered in the PEIR. Additionally, these proposed modifications will require
an increase in the amount of soil export that was considered in the PEIR (e.g., due to the
spoils generated from the deep soil mixing and jet grouting processes).
The temporary on -site concrete batch plant will be electric -powered (e.g., mixing,
conveyors, etc.), which will result in generally minimal and temporary electricity
demand, and will not result in on -site combustion -related air pollutant emissions. The
concrete batch plant will require sand, gravel, and Portland cement deliveries to the site
to produce the concrete. Rebar and other supplies may also be delivered to the site. The
PEIR accounted for 600 delivery trucks during construction. The material deliveries
associated with the concrete batch plant and related supplies under the Project
Modifications is conservatively estimated to add up to 600 delivery trucks, or
approximately 4 to 5 trucks per day over the 125 work days, on top of those accounted
for in the PEIR. Therefore, additional delivery truck emissions will occur under the
Project Modifications beyond what was analyzed in the PEIR. As discussed in Item (b)
below, the additional emissions would not cause or contribute to an exceedance of the
applicable SCAQMD significance thresholds.
The three bore/drill rigs will be diesel -powered and meet the Tier 4 final emissions
standards, as per PEIR mitigation measure AQ-1. The air pollutant emissions were
quantified using the California Emissions Estimator Model (CalEEMod), version
2020.4.0, using the model -provided equipment horsepower and usage factors.
The increased amount of soil export generated by the proposed Project Modifications will
require additional haul truck trips; however, the maximum daily haul trucks will be the
same as what was analyzed in the PEIR. The PEIR estimated a maximum of 72 daily haul
trucks generating 72 inbound trips and 72 outbound trips per day. The Project
Modifications will result in approximately 97,200 cubic yards of soil export and no soil
import. The daily export volume for the project as modified would be up to approximately
780 cubic yards if export only occurs during the 125 concrete work days, but would be less
than 780 cubic yards if export occurs over a longer period during the overall 57-month
construction duration (excluding the 32-month commission and startup duration). The PEIR
evaluated up to 1,075 cubic yards of combined soil export and import. Therefore, the
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Addendum to the Final Program EIR
Project Modifications would result in truck hauling that would be less than the PEIR. No
additional truck hauling emissions would occur as a result of the Project Modifications.
The estimated increase in air pollutant emissions from the on -site concrete batch plant
and drill rig are provided in the next section under Item (b). As shown, the Project
Modifications will have a minor increase in construction air pollutant emissions;
however, the minor increase will not result in new impacts or a substantial increase in
previously identified significant impacts. As specified in the PEIR, the Project
Modifications will implement Mitigation Measures AQ-1 and AQ-2 from the PEIR to
reduce NOx emissions during construction. With implementation of Mitigation Measures
AQ-1 and AQ-2, construction NOx emissions will be reduced to below the SCAQMD
significance threshold and construction impacts with respect to the AQMP will be
mitigated to less than significant.
Once constructed, the perimeter wall would not emit air emissions.
Mitigation Measures from the 2017 BMP PEIR
AQ-1: Mobile off -road construction equipment (wheeled or tracked) used during
construction of the individual projects of the proposed program shall meet the
USEPA Tier 4 final standards, either as original equipment or equipment retrofitted
to meet the Tier 4 final standards. A copy of each unit's certified tier specification or
model year specification shall be available upon request at the time of mobilization of
each applicable unit of equipment.
AQ-2: When grading activities associated with the nine projects of the proposed
program occur within 50 meters of the nearest sensitive receptors, the number of
scrapers active onsite is restricted to a maximum of 5 and the number of dozers is
restricted to a maximum of 2.
b) Cumulatively considerable net increase of any criteria pollutant
TPAD Digester Facility
As summarized above, the Project Modifications will generate additional air pollutant
emissions that were not accounted for in the PEIR from the on -site concrete batch plant
and the use of drill rigs. Based on the scope of the proposed Project Modifications, the
concrete batch plant is assumed to operate for approximately twelve months and produce
up to approximately 4,000 cubic yards of concrete. It is assumed that the concrete batch
plant and drill rigs associated with construction of the south perimeter wall and
associated deep soil mixing could overlap with other on -site construction activities.
The estimated increase in air pollutant emissions from the on -site concrete batch plant
and drill rigs are provided in Table 3, Mitigated Regional Construction Emissions for the
Approved Project and Modified Project. Similar to the project analyzed in the PEIR, the
project modifications will implement Mitigation Measures AQ-1 and AQ-2 to reduce
emissions during construction. With implementation of Mitigation Measures AQ-1 and
AQ-2, construction NOx emissions will be reduced to below the SCAQMD significance
threshold and impacts would be less than significant.
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Addendum to the Final Program EIR
TABLE 3
MITIGATED REGIONAL CONSTRUCTION EMISSIONS FOR THE APPROVED PROJECT AND MODIFIED PROJECT
Estimated Maximum Daily Emissions (Ibs/day)
Emission Source
ROG
NO,
CO
SO2
PM10
PM2.5
Certified PEIR (Approved Project)
Onsite (PEIR Table 3.2-8)
43.99
8.98
83.21
0.17
9.47
4.97
Offsite (PEIR Table 3.2-8)
3.56
53.42
28.13
0.17
6.80
2.01
Subtotal (PEIR Table 3.2-8)
47.55
62.40
111.33
0.34
16.27
6.98
Addendum (Modified Project)
Concrete Batch Fugitive Dust
-
-
2.38
0.36
Drill Rigs
0.36
1.53
12.87
0.03
0.007
0.007
Delivery/Vendor Trucks
0.01
0.40
0.26
<0.01
0.06
0.02
Subtotal
0.37
1.93
13.13
0.03
2.45
0.39
Total (PEIR + Addendum)
47.92
64.33
124.46
0.37
18.72
7.37
Regional Significance Threshold
75
100
550
150
150
55
Significant Impact?
No
No
No
No
No
No
SOURCE: ESA 2017 and 2022
Once constructed, the project modification's operational emissions will not exceed the
SCAQMD significance thresholds. This finding is consistent with the impact
determination in the PEIR; no new significant impacts will occur, and no new mitigation
measures are required. The estimated increase in air pollutant emissions from operations
are provided in Table 4, Regional Operational Emissions for the Approved Project and
Modified Project. As shown, operational emissions would be less than significant.
TABLE 4
REGIONAL OPERATIONAL EMISSIONS FOR THE APPROVED PROJECT AND MODIFIED PROJECT
Estimated Maximum Daily Emissions (Ibs/day)
Emission Source
ROG
NOX
CO
SO2
PM10
PM2.5
Certified PER (Approved Project)
Subtotal (PEIR Table 3.2-7)
(<1)
11
5
(<1)
1
1
Addendum (Modified Project)
Worker Vehicle Trips
<1
<1
2
<1
1
<1
Subtotal
3.68
53.93
32.42
0.18
10.37
2.55
Total (PEIR + Addendum)
<1
11
7
<1
2
1
Regional Significance Threshold
55
55
550
150
150
55
Significant Impact?
No
No
No
No
No
No
SOURCE: ESA 2017 and 2022
Addendum to the Final Program Environmental Impact Report
34
ESA / D201500626.02
for Biosolids Master Plan for Project No. P2-128
December 2022
Addendum to the Final Program EIR
South Perimeter Wall
As summarized above, the Project Modifications will generate additional air pollutant
emissions that were not accounted for in the PEIR from the on -site concrete batch plant
and the use of drill rigs. The concrete batch plant is assumed to operate for approximately
twelve months and produce up to approximately 4,000 cubic yards of concrete. It is
assumed that the concrete batch plant and drill rigs associated with construction of the
south perimeter wall and associated deep soil mixing could overlap with other on -site
construction activities. The estimated increase in air pollutant emissions from the on -site
concrete batch plant and drill rigs are provided in Table 3, Mitigated Regional
Construction Emissions for the Approved Project and Modified Project. Similar to the
project, the Project Modifications will implement Mitigation Measures AQ-1 and AQ-2
to reduce emissions during construction. With implementation of Mitigation Measures
AQ-1 and AQ-2, construction NOx emissions will be reduced to below the SCAQMD
significance threshold and impacts would be less than significant.
Once constructed, the perimeter wall would not emit air emissions.
Mitigation Measure from the 2017 BMP PEIR
Implementation Mitigation Measures AQ-1 and AQ-2.
c) Expose sensitive receptors to substantial pollutant concentrations
TPAD Digester Facility
As discussed above, the project as modified will generate additional air pollutant
emissions that were not accounted for in the PEIR from the on -site concrete batch plant
and the use of drill rigs. The estimated localized air pollutant emissions from the on -site
concrete batch plant and drill rigs are provided in Table 5, Mitigated Localized
Construction Emissions for the Modified Project. Similar to the project evaluated in the
PEIR, the Project Modifications will implement Mitigation Measures AQ-1 and AQ-2
from the PEIR to reduce emissions during construction. Similar to the project evaluated,
with implementation of Mitigation Measures AQ-1 and AQ-2, localized construction
emissions for the Project Modifications will not exceed the SCAQMD significance
threshold and localized impacts will be mitigated to less than significant.
With respect to construction toxic air contaminant JAC) emissions, as shown in Table 4,
combustion emissions from the drill rig will result in less than 0.01 pounds per day of
PM 10 and PM2.5 (i.e., diesel particulate matter). The drill rig will meet the stringent Tier
4 Final emissions standards as required by Mitigation Measure AQ-1, which substantially
reduces emissions of NOx, PM 10, and PM2.5. Given the negligible diesel particulate
matter emissions, the proposed Project Modifications will not contribute to an increase in
construction health risk impacts in excess of the significance threshold of a cancer risk of
10 in one million and, like the project evaluated in the PEIR, the Project Modifications
will result in a less than significant impact with implementation of mitigation measures.
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Addendum to the Final Program EIR
TABLE 5
MITIGATED LOCALIZED CONSTRUCTION EMISSIONS FOR THE APPROVED PROJECT AND
MODIFIED PROJECT
Estimated Maximum Daily On -Site Emissions (lbs/day)
Emissions Source NOx CO PM10 PM2.5
Certified PER (Approved Project)
Subtotal (PEIR Table 3.2-11)
7
69
6.64
3
Addendum (Modified Project)
Concrete Fugitive Dust
2.38
0.36
Drill Rigs
1.53
12.87
<0.01
<0.01
Subtotal
1.53
12.87
2.39
0.37
Total (PEIR + Addendum)
8.5
81.9
9.03
3.4
Localized Significance Threshold a
183
1,253
13
7
Significant Impact?
No
No
No
No
a The Plant No. 2 program area encompasses approximately 16 acres. The LSTs are conservatively based on the
screening table for the largest area, at the closest receptor distance, and the lower screening criteria of Source
Receptor Area 17 and 18.
SOURCE: ESA 2017 and 2022
Once constructed, the project modifications' operational emissions will not be
substantial, as previously discussed, and will not exceed the SCAQMD operational LSTs
as has been analyzed in the PEIR. Therefore, based on the above, the proposed Project
Modifications will not result in new significant impacts or a substantial increase in the
severity of previously identified significant impacts. This finding is consistent with the
impact determination in the PEIR; no new significant impacts will occur, and no new
mitigation measures are required.
South Perimeter Wall
As discussed above, the project as modified will generate additional air pollutant
emissions that were not accounted for in the PEIR from the on -site concrete batch plant
and the use of drill rigs. The estimated localized air pollutant emissions from the on -site
concrete batch plant and drill rigs are provided in Table 5, Mitigated Localized
Construction Emissions for the Modified Project. Similar to the project evaluated in the
PEIR, the Project Modifications will implement Mitigation Measures AQ-1 and AQ-2
from the PEIR to reduce emissions during construction. Similar to the project evaluated
in the PEIR, with implementation of Mitigation Measures AQ-1 and AQ-2, localized
construction emissions for the Project Modifications will not exceed the SCAQMD
significance threshold and localized impacts would be less than significant.
Once constructed, the perimeter wall would not emit air emissions.
Mitigation Measure from the 2017 BMP PER
Implementation Mitigation Measures AQ-1 and AQ-2.
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for Biosolids Master Plan for Project No. P2-128 December 2022
Addendum to the Final Program EIR
d) Other emissions (such as those leading to odors) adversely affecting a substantial
number of people
TPAD Digester Facility and South Perimeter Wall
Construction of the Project Modifications will not introduce any new odor sources that
were not already analyzed in the PEIR. Therefore, other emissions, such as those leading
to odors from construction will be less than significant and no new mitigation measures
will be required.
Operation of the project as modified will include the same facilities and operational
processes that were considered in the PEIR. The Project Modifications will refine the
locations, sizing, and equipment for the DFF and the DFF odor control facility, including
a design refinement that would utilize low -profile multi -stage chemical scrubbers.
Therefore, with the implementation of the upgraded odor control system, potential odor
impacts to sensitive receptors will be less than significant and the project modifications
will not result in new significant impacts, or a substantial increase in the severity of
previously identified significant impacts. This finding is consistent with the impact
determination in the PEIR; no new significant impacts will occur, and no new mitigation
measures are required.
Summary of Potential Effects on Air Quality
The proposed modifications will not result in new significant environmental effects or result in a
substantial increase in the severity of previously identified significant effects, with respect to air
quality. No further environmental review is required. (Public Resources Code § 21166; CEQA
Guidelines § 15162.).
References
California Air Resources Board (CARB). 2016. Top 4 Summary. Available at:
http://www.arb.ca.gov/adam/topfour/topfourl.php. Accessed April 28, 2016.
—. 2016a. Ambient Air Quality Standards, available at
http://www.arb.ca.gov/research/aags/aags2.pdf
2016b. Summaries of Air Quality Data, 2013 through 2015;
http://www.arb.ca.gov/adam/
. 2017. Air Quality Statistics. Available http://www.arb.ca.gov/adam/. Accessed
September 2017
Office of Health Hazard Assessment (OEHHA). 2015. Air Toxics Hot Spots Program Guidance
Manual for Preparation of Health Risk Assessments. Available at:
http://oehha.ca.gov/air/crnr/notice-adoption-air-toxics-hot-spots-program-guidancemanual-
preparation-health-risk-0. Accessed December 2016.
Addendum to the Final Program Environmental Impact Report 37 ESA / D201500626.02
for Biosolids Master Plan for Project No. P2-128 December 2022
Addendum to the Final Program EIR
South Coast Air Quality Management District (SCAQMD). 1993. California Environmental
Quality Act (CEQA) Air Quality Handbook.
2003. Air Quality Management Plan. Available at:
http://www.agmd.gov/home/library/clean-air-plans/air-quality-mgt-plan/2003-aqmp.
August 2003
. 2008. Final Localized Significance Threshold Methodology. Available at:
http://www.agmd.gov/home/regulations/ceqa/air-quality-analysis-
andbook/localizedsignificance-thresholds. Accessed September 2017.
. 2013. Final Air Quality Management Plan. Available at:
http://www.agmd.gov/home/library/clean-air-plans/air-quality-mgt-plan/final-2012-
airquality-management-plan. February 2013.
2015. Final Report — Multiple Air Toxics Exposure Study in the South Coast Air Basin,
ES-2, 2-11, 6-1. Available at: http://www.agmd.gov/home/library/air-quality-
datastudies/health-studies/mates-iv. Accessed December 2016.
2016a. Draft 2016 Air Quality Management Plan. Available at:
http://www.agmd.gov/home/library/clean-air-plans/air-quality-mgt-plan. Accessed
December 2016.
2016b. Air Quality Management Plan (AQMP), Final 2016 AQMP. Available:
http://www.agmd.gov/home/library/clean-air-plans/air-quality-mgt-plan. Accessed March
2017.
2017. Historical Data by Year. Available: http://www.agmd.gov/home/library/airquality-
data-studies/historical-data-by-year. Accessed September 2017.
U.S. Environmental Protection Agency (USEPA). 2016. The Green Book Non -attainment Areas
for Criteria Pollutants, http://www.epa.gov/oagps001/greenbk/index.html. Accessed April
2016.
. 2017. AirData. Available: http://www.epa.gov/airdata/ad_rep_mon.html. Accessed
September 2017.
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for Biosolids Master Plan for Project No. P2-128 December 2022
Addendum to the Final
EIR
Biological Resources
Issues (and Supporting Information Sources): Yes No Impact
IV.
BIOLOGICAL RESOURCES — Would project modifications, changed
circumstances, or new information substantially increase the severity of
significant impacts identified in the previous CEQA document or result in
new significant impacts that could:
a)
Have a substantial adverse effect, either directly or through habitat
0
modifications, on any species identified as a candidate, sensitive, or
special -status species in local or regional plans, policies, or regulations, or
by the California Department of Fish and Game or U.S. Fish and Wildlife
Service?
b)
Have a substantial adverse effect on any riparian habitat or other sensitive
El 0
natural community identified in local or regional plans, policies, regulations,
or by the California Department of Fish and Game or U.S. Fish and Wildlife
Service?
c)
Have a substantial adverse effect on state or federally protected wetlands
(including, but not limited to, marsh, vernal pool, coastal, etc.) through
direct removal, filling, hydrological interruption, or other means?
d)
Interfere substantially with the movement of any native resident or
migratory fish or wildlife species or with established native resident or
migratory wildlife corridors, or impede the use of native wildlife nursery
sites?
e)
Conflict with any local policies or ordinances protecting biological
El Z
resources, such as a tree preservation policy or ordinance?
f)
Conflict with the provisions of an adopted Habitat Conservation Plan,
Natural Community Conservation Plan, or other approved local, regional, or
state habitat conservation plan?
Discussion
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Have a substantial adverse effect, either directly or through habitat modifications,
on any species identified as a candidate, sensitive, or special -status species in local or
regional plans, policies, or regulations, or by the California Department of Fish and
Game or U.S. Fish and Wildlife Service?
TPAD Digester Facility
The PEIR concluded in Section 3.3.3 that with implementation of Mitigation Measure
1310-1, the TPAD facility would not significantly affect biological resources. The
proposed Project Modifications to the TPAD facilities include additional equipment
within the treatment plant site. Construction activities of the TPAD Digester Facility as
modified will be similar to the construction analyzed in the PEIR.
As analyzed in the PEIR, in order to construct the TPAD facilities, removal of soil,
pavement, and trees would be required. The removal of vegetation has the potential to
disturb nesting birds if the activities occur during nesting season (February 15 to August
31 for songbirds; January 15 to August 31 for raptors). To mitigate potential impacts, the
PEIR included Mitigation Measure 13I0-1, which requires a qualified biologist to do a
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nesting bird survey prior to tree removal. Similar to the project evaluated in the PEIR, the
proposed modifications will implement Mitigation Measure BIO-1 which would address
potential impacts to nesting birds during construction.
Once constructed, the proposed Project Modifications will be located within the same
approximate footprint evaluated in the PEIR The proposed TPAD modifications will not
alter the conclusions of the PEIR. With implementation of BIO-1, potential impacts
would be less than significant ; no new significant impacts will occur no substantial
increase in a previously identified significant impact will occur, and no new mitigation
measures are required.
South Perimeter Wall
The PEIR concluded that potential impacts to biological resources could occur during
construction of the perimeter screening due to removal of existing vegetation, including the
existing perimeter trees. As noted above, the PEIR concludes that implementation of
Mitigation Measure 13I0-1 would reduce the potential impacts to less than significant levels.
The proposed Project Modifications will install a new south perimeter wall that will
extend the construction footprint outward to within approximately 16 feet of the Talbert
Marsh. The existing fence line is approximately 25 feet from the Talbert Marsh edge. The
construction activities will not directly affect the Talbert Marsh. However, construction
of the south perimeter wall will involve the removal of existing ornamental screening
vegetation.
A biological resource field reconnaissance conducted on July 29, 2022, found that this
vegetation was predominantly non-native ornamental plants that may support nesting
common birds, but does not otherwise provide natural habitat value. The survey identified
five individual plants that are California Rare Plant Rank (CRSR) 4 species, the Iva
hayesiana and Juncus acutus leopoldii. These plants are part of the existing landscaping
design and are not naturally occurring within the Plant No. 2. Removal of these plants and
ornamental vegetation along the southern perimeter of the treatment plant will not impact
sensitive species or habitat since the existing vegetation does not provide natural habitat
values and was planted as ornamental landscape vegetation. Mitigation Measures BIO-1
included in the PEIR will be implemented to ensure potential impacts to nesting birds are
avoided or minimized (see p.3.3-12 of the PEIR) during vegetation removal activities. As
a result, the construction of the proposed Project Modifications to the perimeter screening
wall will not change the conclusions of the PEIR.
Once constructed, the new perimeter wall will not affect neighboring habitat areas. The
facility will function similar to existing conditions. This finding is consistent with the
impact determination in the PEIR; no new significant impacts will occur, no increase of a
previously identified significant impact will occur, and no new mitigation measures are
required.
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Mitigation Measure from the 2017 BMP PER
BI0-1: If removal of onsite trees and vegetation associated with the proposed
program occurs during the non -nesting season (September 1 to February 14 for
songbirds; September 1 to January 14 for raptors), no nesting survey or biological
monitor are required.
If the removal of onsite trees and vegetation associated with the proposed program
occurs during the nesting season (February 15 to August 31 for songbirds; January 15
to August 31 for raptors), a qualified biologist shall conduct a survey prior to
vegetation removal activities to determine if there are active nests within the onsite
trees and vegetation proposed for removal. If an active nest is not found, no
biological monitor is required. If active nests are detected, a minimum buffer (e.g.,
300 feet for songbirds or 500 feet for raptors) around the nest shall be delineated and
flagged, and no construction activity shall occur within the buffer area until a
qualified biologist determines the nesting species have fledged and is no longer
active or the nest has failed. The buffer may be modified (i.e., increased or
decreased) and/or other recommendations proposed (e.g., a temporary soundwall) as
determined appropriate by the qualified biologist to minimize impacts. The qualified
biologist shall monitor the removal of onsite trees and vegetation. Nest buffer
distance will be based on species, specific location of the nest, the intensity of
construction activities, existing disturbances unrelated to the proposed program
present in the program area, and other factors.
If grading/excavation or pile driving activities associated with the proposed program
are scheduled outside the nesting season, no nesting survey or biological monitor are
required.
If grading/excavation or pile driving activities associated with the proposed program
are scheduled during the nesting season, a qualified biologist shall conduct a survey,
prior to grading/excavation or pile driving activities, of suitable nesting habitat within
500 feet of construction activities for the presence of nesting birds. If no active nests
are detected, no biological monitor is required. If an active nest is detected, a
minimum buffer (e.g., 300 feet for songbirds or 500 feet for raptors) around the nest
shall be delineated and the active nest shall be flagged, and no construction activity
shall occur within the buffer area until a qualified biologist determines the nesting
species have fledged and is no longer active or the nest has failed. The qualified
biologist shall monitor the activities of the active nests within the buffer area. The
buffer may be modified (i.e., increased or decreased) and/or other recommendations
proposed (e.g., a temporary soundwall) as determined appropriate by the qualified
biologist to minimize impacts. Nest buffer distance will be based on species, specific
location of the nest, the intensity of construction activities, existing disturbances
unrelated to the proposed program present in the program area, and other factors.
If there is a lapse of construction activities associated with the proposed program
during the nesting season for seven days or more, an additional nesting bird survey
shall be conducted to determine if a nest is present prior to construction activities
resuming. The procedure identified above for no active nest and an active nest shall
be followed.
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b) Have a substantial adverse effect on any riparian habitat or other sensitive natural
community identified in local or regional plans, policies, regulations, or by the
California Department of Fish and Game or U.S. Fish and Wildlife Service?
TPAD Digester Facility
The PEIR stated that the majority of OC San Plant No. 2 consists of paved surfaces with
no habitat values. The closest sensitive habitats exist within Talbert Marsh 25 feet south
of the existing perimeter fence. The PEIR concluded that the construction of the TPAD
facilities would not result in direct or indirect impacts to riparian habitat or other sensitive
natural communities.
The modifications to the TPAD facilities involve additional facilities within the treatment
plant site. No new impacts to riparian habitats or identified sensitive natural communities
from construction will occur.
Once constructed, the modified TPAD facilities will function as assumed in the PEIR.
Therefore, no new significant impacts will occur, no substantial increase in the severity
of previously identified significant impacts would occur, and no new mitigation measures
are required.
South Perimeter Wall
The PEIR assumed that the construction of the new perimeter screening project would be
confined to within the treatment plant site. The PEIR concluded that impacts from
construction of the perimeter screening improvements would not directly or indirectly
affect adjacent sensitive habitats.
The construction of the south perimeter wall will be adjacent to the Talbert Marsh. As
modified, the construction footprint for the new perimeter wall will extend to within
approximately 16 feet from the edge of the marsh. An approximately 6-foot-wide bike
lane and an approximately 10-foot-wide shoulder will be maintained during construction
providing 16 feet between the marsh and construction activities. This construction edge
will be maintained with temporary construction fencing. As a result, no marsh habitat
will be affected.
As to indirect effects, as stated in the PEIR, stormwater runoff will be controlled through
the preparation of a stormwater pollution control plan (SWPPP) which will include Best
Management Practices (BMPs) that will be implemented during construction to prevent
any surface runoff or debris from entering the Talbert Marsh. Noise and disruption
associated with construction activities will be confined to daytime hours, minimizing
indirect effects of the construction. The construction zone controls and work time
restrictions will be similar to the measures identified in the PEIR to minimize indirect
impacts. Although the construction activities would occur closer to the Talbert Marsh
than the project evaluated in the PEIR, direct and indirect effects to the marsh would be
avoided through BMPs included in the PEIR.
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Once constructed, the edge of the south perimeter wall will be approximately 25 feet
from the Talbert Marsh, similar to the existing 25-foot distance. The PEIR concluded that
the new perimeter wall will not impinge on surrounding habitats. For the reasons
explained above, the proposed modifications do not alter this conclusion. Therefore, no
new significant impacts will occur, no substantial increase of previously identified
significant impacts would occur, and no new mitigation measures are required.
c) Have a substantial adverse effect on state or federally protected wetlands (including,
but not limited to, marsh, vernal pool, coastal, etc.) through direct removal, filling,
hydrological interruption, or other means?
TPAD Digester Facility
The PEIR concluded in Section 3.3.3 that the TPAD facilities would not affect wetlands.
The proposed modifications to the TPAD Digester Facility will occur on disturbed areas
within Plant No. 2 and will not affect any wetlands.
Construction of the proposed, modified TPAD facilities will not have the potential to
directly or indirectly affect wetlands since construction activities will occur entirely
within the footprint of the treatment plant which is devoid of wetlands.
Once constructed, the distance from the plant perimeter wall will be 25 feet from the
nearest wetland, similar to the existing distance from the fence to the marsh. Therefore,
no impacts to wetlands will occur. The Project Modifications to the TPAD facilities will
not alter the conclusions of the PEIR.
South Perimeter Wall
The PEIR evaluated impacts to wetlands from the construction of the perimeter screening
project and concluded that the project would not directly or indirectly affect wetlands.
Construction of the perimeter wall will not have the potential to directly or indirectly
affect wetlands since construction activities will occur 10 feet from the edge of the marsh
as shown in Figure 5. BMPs such as straw wattles and construction fencing will be
implemented to prevent stormwater runoff and construction equipment from leaving the
facility.
Once constructed, the distance from the plant perimeter wall will be 25 feet from the
nearest wetland, similar to the existing distance from the fence to the marsh. Therefore,
no impacts to wetlands will occur. The Project Modifications to the perimeter screening
will not alter the conclusions of the PEIR.
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d) Interfere substantially with the movement of any native resident or migratory fish
or wildlife species or with established native resident or migratory wildlife
corridors, or impede the use of native wildlife nursery sites?
TPAD Digester Facility
The PEIR concluded that construction and operation of the TPAD facilities within Plant
No. 2 would not affect wildlife movement. The site is an active wastewater treatment
plant and does not accommodate a wildlife movement corridor.
The modified TPAD facilities would still be constructed and operated within the same
approximate footprint within Plant No. 2 and therefore would not alter this conclusion.
No new significant impacts will occur, no substantial increase in previously identified
significant impacts would occur, and no new mitigation measures are required.
South Perimeter Wall
The PEIR concluded that the perimeter screening project would have no effect on
wildlife movement. Construction of the new perimeter wall will remove vegetation, but
will not alter wildlife movement since wildlife does not enter the treatment plant from
offsite. The new perimeter wall will not affect any wildlife movement offsite.
Once constructed, the wall called for in the Project Modifications will act as a barrier to
ground -dwelling animals such as rodents and reptiles. The wall will reduce any
movement onto the plant site from the marsh. Since the existing treatment plant site is an
industrial area, the new barrier will keep ground -dwelling wildlife from harm's way if
they will otherwise venture onto the plant site. No new significant impacts will occur, no
substantial increase in the severity of previously identified significant impacts would
occur, and no new mitigation measures are required.
e) Conflict with any local policies or ordinances protecting biological resources, such
as a tree preservation policy or ordinance?
TPAD Digester Facility
As discussed in Section 3.3.3 of the PEIR (see p.3.3-16 of the PEIR), the City of
Huntington Beach General Plan and Municipal Code do not contain local policies or
ordinances to protect biological resources on non -City properties. The Local Coastal Plan
(LCP), however, does include measures to protect environmentally sensitive habitat areas
(ESHA) as defined in the California Coastal Act. Construction of the TPAD facilities will
occur entirely within the treatment plant and will not impact ESHA. The projects will
require approval from the City of Huntington Beach LCP. OC San will submit an
application for a Coastal Development Permit (CDP) and Conditional Use Permit (CUP)
for the TPAD project.
The modifications to the TPAD facilities will not alter this requirement. The Project
Modifications will be subject to these local ordinances, consistent with the conclusions of
the PEIR.
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The new DC-M building will require excavation to underground the utilities and to
construct the building foundation. This excavation would be close to the existing
eucalyptus trees that currently line the western plant boundary and could impact the root
system of the existing trees. The impacted eucalyptus trees may be removed to avoid
future hazards of dead tree branches or entire trees falling into the Plant or on the
sidewalk along Brookhurst Street. If the trees are removed, they would be replaced with
containerized trees with crowns reaching 10 to 15 feet tall. Since the border trees provide
no habitat values, no impacts to sensitive biological resources would occur. Since the
City of Huntington Beach does not have a tree ordinance, the potential tree removals on
OC San property would not require any authorization. Once constructed, the new TPAD
facilities will not impact any policy or ordinance. No new significant impacts will occur,
no substantial increase in the severity of previously identified significant impacts would
occur, and no new mitigation measures are required.
South Perimeter Wall
The PEIR concluded that removal of the perimeter trees as part of the perimeter screening
project would be consistent with local tree ordinance policies. The Project Modifications
do not alter this conclusion since the existing vegetation does not constitute sensitive
habitat, and no special status trees would be removed.
Once constructed, the perimeter wall will function as the edge of the treatment plant
consistent with existing conditions. No new significant impacts will occur, and no new
mitigation measures are required.
f) Conflict with the provisions of an adopted Habitat Conservation Plan, Natural
Community Conservation Plan, or other approved local, regional, or state habitat
conservation plan?
TPAD Digester Facility and South Perimeter Wall
The PEIR identified that the project area is located within the Orange County Habitat
Conservation Plan/Natural Community Conservation Plan (HCP/NCCP) (CDFW 2022).
However, the project site is not within an area that is specifically protected or has
additional conditions for conservation. Construction of the TPAD facilities will not affect
vegetation within the HCP/NCCP. Construction of the new perimeter wall will occur
within the treatment plant site and slightly beyond onto the bike path, 16 feet from the
closest sensitive area. This activity will not require approval form the HCP/NCCP since
no listed species or sensitive habitats will be affected. The proposed modifications will
not alter this condition since the project footprint has not changed.
Once constructed, the edge of the south perimeter wall will remain 25 feet from the edge
of the Talbert Marsh. The proposed Project Modifications to the perimeter screening will
not impact the marsh and will not conflict with the HCP/NCCP. No new significant
impacts will occur, no substantial increase in the severity of previously identified
significant impacts would occur, and no new mitigation measures are required.
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Addendum to the Final Program EIR
Summary of Potential Effects on Biological Resources
The proposed modifications will not result in new significant environmental effects, or result in a
substantial increase in the severity of previously identified significant effects, with respect to
biological resources. No further environmental review is required. (Public Resources Code §
21166; CEQA Guidelines § 15162.).
References
California Department of Fish and Wildlife (CDFW), 2022. NCCP Plan Summary- County of
Orange (Central/Coastal) NCCP/HCP. Available at:
https://www.wildlife.ca.gov/Conservation/Planning/NCCP/Plans/Orange-Coastal, accessed
August 30, 2022.
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Cultural Resources
Issues (and Supporting Information Sources):
Yes
No
V.
CULTURAL RESOURCES — Would project modifications, changed
circumstances, or new information substantially increase the severity of
significant impacts identified in the previous CEQA document or result in
new significant impacts that could:
a)
Cause a substantial adverse change in the significance of a historical
❑
resource pursuant to §15064.5?
b)
Cause a substantial adverse change in the significance of an archaeological
❑
❑X
resource pursuant to §15064.5?
c)
Disturb any human remains, including those interred outside of dedicated
❑
❑X
cemeteries?
Discussion
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Cause a substantial adverse change in the significance of a historical resource
pursuant to §15064.5?
TPAD Digester Facility and South Perimeter Wall
A cultural resources evaluation regarding potential historic properties within Plant No. 2
was conducted for the PEIR. The evaluation concluded that there are no previously
identified historical resources in Plant No. 2 or within'/4-mile of Plant No. 2 that could be
directly or indirectly affected by the proposed Project.
The modifications to the TPAD facility and perimeter wall will not alter the construction
area footprint evaluated in the PEIR. Therefore, no new significant impacts will result
from construction or operation of the modified TPAD facilities, no substantial increase in
the severity of previously identified significant impacts would occur, and no new
mitigation measures are required.
b) Cause a substantial adverse change in the significance of an archaeological resource
pursuant to §15064.5?
TPAD Digester Facility and South Perimeter Wall
As discussed in Section 3.4.3 of the PEIR (p. 3.4-27), no archaeological resources were
identified in the proposed project site or in close proximity to the project site. The PEIR
concluded that previously unknown archeological resources may be encountered with
respect to excavations located within a favorable area (near water sources) for prehistoric
inhabitance. The PEIR concludes that with implementation of Mitigation Measures
CUL-1 through CUL-4 potential impacts will be avoided or minimized.
These measures will apply to the updated project. The Project Modifications will all
occur within the area evaluated in the PEIR. The Project Modifications will include
CDSM and CIDH piles that will disturb soil from surface grade down to 35 to 75 feet
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below grade. The placement of concrete will occur at depths generally within and below
the deposits with potential archaeological resources. As a result, the modifications would
potentially impact deposits identified in the PEIR and would require the implementation
of Mitigation Measures CUL-1 through CUL-4 from the PEIR. With implementation of
Mitigation Measures CUL-1 through CUL-4, impacts would remain less than significant
similar to the conclusions of the PEIR. The potential for impacts to known archaeological
resources will be similar to the conclusions of the PEIR for both construction and
operation.
Once constructed, the Project Modifications will not affect archaeological resources. As a
result, the Project Modifications will not result in a new significant impact or
substantially increase the severity of a previously identified impact. No new mitigation is
required. This finding is consistent with the impact determination in the PEIR.
Mitigation Measures from the 2017 BMP PER
CUL-1: Prior to start of grading or excavation activities associated with the proposed
program and within Plant No. 1 and Plant No. 2, OCSD shall retain a qualified
archaeologist meeting the Secretary of the Interior's Professional Qualifications
Standards for archaeology (U.S. Department of the Interior 2008) to carry out all
mitigation related to archaeological resources.
CUL-2: Prior to start of grading or excavation activities associated with the proposed
program and within Plant No. 1 and 2, the qualified archaeologist (or an
archaeologist working under the direct supervision of the qualified archaeologist)
shall conduct cultural resources sensitivity training for all construction personnel.
Construction personnel shall be informed of the types of archaeological resources
that may be encountered, the proper procedures to be enacted in the event of an
inadvertent discovery of archaeological resources or human remains, and safety
precautions to be taken when working with archaeological monitors. OCSD shall
ensure that construction personnel are made available for and attend the training and
retain documentation demonstrating attendance.
CUL-3: Archaeological and Native American monitoring shall be conducted for
grading or excavation activities associated with the proposed program at Plant No. 1
and Plant No. 2. Archaeological monitoring shall be conducted by an archaeologist
familiar with the types of archaeological resources that could be encountered within
the program area, and under the direct supervision of the qualified archaeologist. The
frequency of monitoring shall take into account the rate of excavation and grading
activities, the materials being excavated (native versus artificial fill soils and older
versus younger soils), and the depth of excavation. The frequency of the monitoring
shall be determined by the qualified archaeologist in consultation with the Native
American monitor and in coordination with OCSD. The Native American monitor
shall be selected from a tribe that is culturally and traditionally affiliated with the
program area as indicated by the NAHC. In the event that archaeological resources
are unearthed during ground -disturbing activities, the archaeological monitor and/or
Native American monitor shall be empowered to halt or redirect ground -disturbing
activities away from the vicinity of the discovery until OCSD, a qualified
archaeologist, and a Native American monitor have evaluated the discovery and
determined appropriate treatment (as prescribed in CUL-4). The archaeological
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monitor shall keep daily logs detailing the types of activities and soils observed, and
any discoveries. After monitoring has been completed, the qualified archaeologist
shall prepare a report that details the results of monitoring for submittal to OCSD, the
South Central Coastal Information Center, and any Native American tribe that
requests a copy.
CUL-4: In the event of the unanticipated discovery of archaeological materials
during grading or excavation activities associated with the proposed program, OCSD
shall immediately cease all work activities in the area (within approximately 100
feet) of the discovery until it can be evaluated by the qualified archaeologist.
Construction shall not resume until the qualified archaeologist has conferred with
OCSD on the significance of the resource.
In the event that preservation in place is determined to be infeasible and data
recovery through excavation is the only feasible mitigation available, an
Archaeological Resources Treatment Plan shall be prepared and implemented by the
qualified archaeologist in consultation with OCSD that provides for the adequate
recovery of the scientifically consequential information contained in the
archaeological resource. OCSD shall consult with appropriate Native American
representatives in determining treatment for prehistoric or Native American resources
to ensure cultural values ascribed to the resource are considered.
c) Disturb any human remains, including those interred outside of dedicated
cemeteries?
TPAD Digester Facility and South Perimeter Wall
The PEIR concludes in Section 3.4.3 that although unlikely, excavation may encounter
human remains. Mitigation Measure CUL-9 ensures that any remains will be handled
appropriately to avoid a significant impact.
The Project Modifications will include CDSM and CIDH pile activities that will disturb
soil from surface grade down to 35 to 75 feet below grade. The placement of concrete
will occur at depths generally within and below the deposits with potential remains. As a
result, with implementation of Mitigation Measures CUL-1 through CUL-9, impacts
would remain less than significant similar to the conclusions of the PEIR. The
modifications to the project will be subject to similar mitigation and do not alter the
conclusions in the PEIR. Once constructed, no impact would occur, consistent with the
conclusions in the PEIR
Mitigation Measures from the 2017 BMP PEIR
CUL-9: If human remains are encountered during construction activities associated
with the proposed program, OCSD or its contractor shall halt work in the vicinity
(within 100 feet) of the find and contact the Orange County Coroner in accordance
with PRC Section 5097.98 and Health and Safety Code Section 7050.5. If the County
Coroner determines that the remains are Native American, the NAHC will be notified
in accordance with Health and Safety Code Section 7050.5, subdivision (c), and PRC
Section 5097.98. The NAHC will designate a Most Likely Descendant (MLD) for the
remains per PRC Section 5097.98. Until the landowner has conferred with the MLD,
OCSD shall ensure that the immediate vicinity where the discovery occurred is not
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disturbed by further activity, is adequately protected according to generally accepted
cultural or archaeological standards or practices, and that further activities take into
account the possibility of multiple burials.
Summary of Potential Effects on Cultural Resources
The proposed modifications will not result in new significant environmental effects, or result in a
substantial increase in the severity of previously identified significant effects, with respect to
cultural resources. No further environmental review is required. (Public Resources Code § 21166;
CEQA Guidelines § 15162.).
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EIR
Energy
Issues (and Supporting Information Sources): Yes No
A. ENERGY— Would project modifications, changed circumstances, or new
information substantially increase the severity of significant impacts
identified in the previous CEQA document or result in new significant
impacts that could:
a) Result in potentially significant environmental impact due to wasteful, ❑ 71
inefficient, or unnecessary consumption of energy resources, during project
construction or operation?
b) Conflict with or obstruct a state or local plan for renewable energy or energy ❑ 71
efficiency?
Discussion
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Result in potentially significant environmental impact due to wasteful, inefficient, or
unnecessary consumption of energy resources, during project construction or
operation
TPAD Digester Facility and South Perimeter Wall
Electricity
The PEIR evaluated energy requirements for implementation of the entire BMP on page
2-30. The PEIR summarizes emissions from energy use on page 3.2-27. However, the
PEIR did not provide any conclusions regarding the wasteful, inefficient, or unnecessary
consumption of energy resources, since it was not a CEQA requirement at the time of the
PEIR's certification.
The modified TPAD facility would require similar amounts of electricity during
construction as anticipated in the PEIR with the addition of the power needed for the
batch plant. The batch plant is needed to supply the volume of concrete needed to
construct the TPAD facility foundations. This additional energy use would not be
wasteful, but would enhance efficiency by producing construction materials needed on
site.
As discussed in Chapter 2, Project Description, and in Section 3.6, Greenhouse Gas
Emissions, of the PEIR, once constructed, the project will increase the energy efficiency
of the facilities, and as such, will not generate a net demand for energy from outside of
Plant No. 2 that cannot be supported by the existing CenGen facility at Plant No. 2.
The proposed Project Modifications will decrease the number of digesters compared to
existing conditions and increase the number of boilers by one compared to the PEIR (i.e.,
three boilers with a fourth in the future compared to two boilers with a third in the
future). The primary fuel source for the boilers is intended to be digester gas. Natural gas
would be supplemented only if sufficient digester gas is not available; however, it is not
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known if or when this would be needed. Only two of the new boilers would operate at a
time, and would do so in a lead/lag fashion, responding to heating demands that vary
throughout the day and by season. Since the primary fuel source would be digester gas,
the net demand for energy would be minimal.
Electricity transmission to the project site is provided and maintained by Southern
California Edison (SCE). During construction of the Project Modifications, electricity
will be consumed to supply and convey water for dust control and, on a limited basis,
may be used to power lighting, electronic equipment, and other construction activities
necessitating electrical power. The proposed project modifications' temporary
construction electrical demand will be offset by the energy efficiency upgrades for the
facility. Electricity for construction will be obtained from the existing electrical lines that
connect to the project site. When not in use, electric equipment will be powered off to
avoid unnecessary energy consumption. Electricity use from construction will be short-
term, limited to working hours, used for necessary construction -related activities, and
represent a small fraction of the project modifications' net annual operational electricity.
Electrical construction equipment will also comply with California Code of Regulations,
Title 24 requirements, which are a set of prescriptive standards establishing mandatory
maximum energy consumption levels for buildings. Although Title 24 requirements
typically apply to energy usage for buildings, long-term construction lighting (longer than
120 days) providing illumination for the project site and staging areas will also comply
with applicable Title 24 requirements, which includes limits on the wattage allowed per
specific area, resulting in the conservation of energy. I In addition, construction
equipment will comply with energy efficiency requirements contained in the Federal
Energy Independence and Security Act or previous Energy Policy Acts for electrical
motors and equipment.2 Therefore, construction of the Project Modifications will not
result in the wasteful, inefficient, or unnecessary consumption of electricity. Accordingly,
impacts will be less than significant, and no mitigation measures will be required.
Once constructed, the project will be required to comply with Title 24 standards and
applicable California Code of Regulations, and Title 11 (CALGreen) requirements, which
include the incorporation of energy efficient water features, lighting, and mechanical
equipment to reduce energy consumption. The proposed Project Modifications will be
required to comply with the most recent State Energy Conservation Standards contained
in Title 24 of the CCR standards, which is a set of prescriptive standards establishing
mandatory maximum energy consumption levels for buildings. Along with CALGreen
requirements, these standards include minimum energy efficiency requirements related to
building envelope, mechanical systems (e.g., heating, ventilation, and air conditioning
[HVAC] and water heating systems), indoor and outdoor lighting, and illuminated signs.
Therefore, operation of the project modifications will not result in the wasteful,
' California Building Energy Efficiency Standards, Title 24, Part 6, § 110.9, § 130.0, and § 130.2.
2 Energy Independence and Security Act of 2007. (Pub.L. 110-140).
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inefficient, or unnecessary consumption of electricity. Accordingly, impacts will be less
than significant, and no new mitigation measures will be required.
Natural Gas
Natural gas will be provided to the project site by Southern California Gas (SoCalGas).
Construction activities, including the construction of new buildings and facilities,
typically do not involve the consumption of natural gas. Thus, there will be no demand
generated by construction, especially when compared to the design changes relative to
the Project, discussed above. Therefore, construction of the Project Modifications will not
result in the wasteful, inefficient, or unnecessary consumption of natural gas.
Once constructed, natural gas required for operation of the TPAD facility will be supplied
by SoCalGas from existing natural gas facilities. The project will be required to comply
with Title 24 standards and CALGreen requirements, which includes the incorporation of
energy efficient water features, lighting, and mechanical equipment to reduce energy
consumption. Therefore, like the project, operation of the project modifications will not
result in the wasteful, inefficient, or unnecessary consumption of natural gas. This finding
is consistent with the impact determination in the PEIR; no new significant impacts will
occur, and no new mitigation measures are required.
Transportation Fuel
The concrete batch plant will require sand, gravel, and Portland cement deliveries to the
site to produce the concrete. The PEIR accounted for 600 delivery trucks during
construction. As discussed in Section III, Air Quality, Item (a), the concrete batch plant
will require sand, gravel, and Portland cement deliveries to the site to produce the
concrete. The material deliveries associated with the concrete batch plant and related
supplies under the Project Modifications is conservatively estimated to add up to 1,200
delivery trucks (60 for the TPAD facility and an additional 600 for the perimeter wall), or
approximately 4 to 5 trucks per day over the 125 work days for the concrete batch plant,
on top of those accounted for in the PEIR. The minimal number of 4 to 5 trucks per day
would not impact local or regional fuel supplies. As the trucks would be used to deliver
necessary supplies to the project site and comply with all applicable regulations including
anti -idling restrictions and truck fleet engine standards, impacts will be less than
significant, and no new mitigation measures will be required.
Once constructed, the TPAD facility would add approximately 30 additional workers
beyond what was assumed in the PEIR. The approximately 30 additional workers would
also not contribute substantially to vehicle miles traveled (VMT) (refer to Section XVII,
Transportation, Item (b), below, which determined that the Project Modifications would
not result in substantial VMT). Therefore, similar to the project, transportation fuel
demand for the Project Modifications will not result in the wasteful, inefficient, or
unnecessary consumption of energy, particularly given the minor design changes relative
to the project as discussed above. Accordingly, impacts will be less than significant, and
no new mitigation measures will be required. This finding is consistent with the impact
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determination in the PEIR; no new significant impacts will occur, and no new mitigation
measures are required.
b) Conflict with or obstruct a state or local plan for renewable energy or energy
efficiency
TPAD Digester Facility and South Perimeter Wall
Electricity
Similar to the project, the Project Modifications' construction electrical demand will be
obtained from the existing electrical lines that connect to the Plant No. 2. Electricity use
from construction will be short-term, limited to working hours, used for necessary
construction -related activities, and represent a small fraction of the Modified Project's net
annual operational electricity.
During operation, power will be distributed to the TPAD Digester Facility from a new
electrical power building (Distribution Center M [DC-M]), with additional partial
basement. The Project Modifications will be required to comply with the most recent
State Energy Conservation Standards contained in Title 24 of the CCR standards, which
is a set of prescriptive standards establishing mandatory maximum energy consumption
levels for buildings. Along with CALGreen requirements, these standards include
minimum energy efficiency requirements related to building envelope, mechanical
systems (e.g., heating, ventilation, and air conditioning [HVAC] and water heating
systems), indoor and outdoor lighting, and illuminated signs. Therefore, operation will
not result in conflict or obstruction of state or local plans for renewable energy to energy
efficiency.
Natural Gas
Natural gas, as needed, will be provided to Plant No. 2 by Southern California Gas
(SoCalGas). Construction activities, including the construction of new buildings and
facilities, typically do not involve the consumption of natural gas. Thus, there will be no
demand generated by construction, especially when compared to the design changes
relative to the project, discussed above. Therefore, construction of the Project
Modifications will not result in the conflict or obstruction of state or local plans for
renewable energy to energy efficiency.
Natural gas, if needed for the proposed project modification's operation, will be supplied
by SoCalGas from existing natural gas facilities. However, the Project Modifications will
require construction of new, on -site gas distribution lines to serve the new Boiler Facility.
The Project Modifications will increase the number of boilers by one compared to the
PEIR (i.e., three boilers with a fourth in the future compared to two boilers with a third in
the future). The primary fuel source for the boilers is intended to be digester gas. Natural
gas would be supplemented only if sufficient digester gas is not available; however, it is
not known if or when this would be needed. Only two of the new boilers would operate at
a time, and would do so in a lead/lag fashion, responding to heating demands that vary
throughout the day and by season. Since the primary fuel source would be digester gas,
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the net demand for energy would be minimal. The Project Modifications will be required
to comply with Title 24 standards and CALGreen requirements, which includes the
incorporation of energy efficient water features, lighting, and mechanical equipment to
reduce energy consumption. Therefore, operation will not result in the conflict or
obstruction of state or local plans for renewable energy to energy efficiency.
Accordingly, impacts will be less than significant, and no mitigation measures will be
required.
Transportation Fuel
The proposed modifications to the existing south perimeter screening will require
bore/drill rigs, which were not considered in the PEIR. Additionally, the proposed
modifications will require an increase in the amount of soil export than was considered in
the PEIR.
The PEIR accounted for 600 delivery trucks during construction. As discussed above, the
material deliveries associated with the concrete batch plant and related supplies under the
Project Modifications is conservatively estimated to add up to 1,200 delivery trucks (60
for the TPAD facility and an additional 600 for the perimeter wall), or approximately 4 to
5 trucks per day. The minimal number of 4 to 5 trucks per day would not impact local or
regional fuel supplies. As the trucks would be used to deliver necessary supplies to the
project site and comply with all applicable regulations including anti -idling restrictions
and truck fleet engine standards, impacts will be less than significant, and no mitigation
measures will be required.
The bore/drill rigs will require diesel fuel. Based on the analysis in Section VIII,
Greenhouse Gas Emissions, of this Addendum, the increase in construction transportation
fuel from the project modifications will be approximately 1 percent compared to the
project, which will not be a substantial increase. Construction transportation fuel demand
will be temporary and will cease once construction activities are completed. Furthermore,
transportation fuel demand will occur for necessary construction activities, such as
drilling and hauling of excavated materials.
During operations, the Project Modifications would add approximately 30 additional
workers beyond what was assumed in the PEIR. The approximately 30 additional
workers would also not contribute substantially to vehicle miles traveled (VMT) (refer to
Section XVII, Transportation, Item (b), below, which determined that the Project
Modifications would not result in substantial VMT). Similar to the project, the Project
Modifications will not generate a substantial long-term increase in transportation fuel
demand and would not generate substantial VMT in conflict with transportation plans
such as the Southern California Association of Governments (SLAG) Regional
Transportation Plan/Sustainable Communities Strategy (RTP/SCS).
Therefore, like the project, transportation fuel demand for the proposed Project
Modifications will not result in any substantial increase in transportation energy and will
not result in the conflict or obstruction of state or local plans for renewable energy to
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energy efficiency. This finding is consistent with the impact determination in the PEIR;
no new significant impacts will occur, and no new mitigation measures are required.
Summary of Potential Effects on Energy
The proposed modifications will not result in substantial changes to energy, cause new significant
environmental effects, or result in a substantial increase in the severity of previously identified
significant effects, with respect to energy. No further environmental review is required. (Public
Resources Code § 21166; CEQA Guidelines § 15162.).
References
California Building Energy Efficiency Standards, Title 24, Part 6, § 110.9, § 130.0, and § 130.2.
Energy Independence and Security Act of 2007. (Pub.L. 110-140).
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Geology and Soils
Issues (and Supporting Information Sources):
VII. GEOLOGY AND SOILS — Would project modifications, changed
circumstances, or new information substantially increase the severity of
significant impacts identified in the previous CEQA document or result in
new significant impacts that could:
a) Directly or indirectly cause potential substantial adverse effects, including the
risk of loss, injury, or death involving:
i) Rupture of a known earthquake fault, as delineated on the most recent
Alquist-Priolo Earthquake Fault Zoning Map issued by the State
Geologist for the area or based on other substantial evidence of a
known fault? Refer to Division of Mines and Geology Special
Publication 42.
ii) Strong seismic ground shaking?
iii) Seismic -related ground failure, including liquefaction?
iv) Landslides?
b) Result in substantial soil erosion or the loss of topsoil?
c) Be located on a geologic unit or soil that is unstable, or that would become
unstable as a result of the project, and potentially result in on- or off -site
landslide, lateral spreading, subsidence, liquefaction, or collapse?
d) Be located on expansive soil, as defined in Table 18-1-B of the Uniform
Building Code (1994), creating substantial direct or indirect risks to life or
property?
e) Have soils incapable of adequately supporting the use of septic tanks or
alternative waste water disposal systems where sewers are not available for
the disposal of waste water?
f) Directly or indirectly destroy a unique paleontological resource or site or
unique geologic feature?
Discussion
Addendum to the Final Program EIR
Yes No
❑ ❑X
❑ ❑X
❑ ❑X
❑ ❑X
❑ ❑X
❑ ❑X
❑ ❑X
❑ ❑X
❑ ❑X
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a.i, ii, iii, iv) Rupture of a known earthquake fault, as delineated on the most recent
Alquist-Priolo Earthquake Fault Zoning Map issued by the State Geologist for the
area or based on other substantial evidence of a known fault? Refer to Division of
Mines and Geology Special Publication 42; Strong seismic ground shaking, Seismic
related ground failure including liquefaction, or landslides
TPAD Digester Facility
The PEIR described that the treatment plant is not within a designated Alquist-Priolo
Earthquake Fault Zone (AP Zone), but is within an area with active splays of the
Newport -Inglewood fault (DOC 1998) susceptible to seismic ground shaking. As
discussed in Section 3.5-1 of the PEIR (p.3.5-12), geotechnical studies conducted on
Plant No. 2 by Kleinfelder (2017) have identified the presence of fault traces associated
with the Newport -Inglewood fault zone directly under the Plant. As discussed in Section
3.5-1 in the PEIR (p.3.5-13), the Newport -Inglewood -Rose Canyon fault is capable of
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generating a magnitude (Mw) 7.1 earthquake and has an estimated slip rate of 0.5 to 2.0
millimeters per year.
The Project Modifications would occur in the same project footprint and would therefore
not alter the conclusions of the PEIR. However, as a measure to increase seismic
resilience, the Project Modifications will include CDSM as a construction method to
support foundations of the new facilities. The modifications to the TPAD Digester
Facility involve new equipment and structures located within the treatment plant.
Construction of the TPAD facilities will implement the recommendations of geotechnical
evaluations conducted during design and will comply with the California Building Code
(CBC) guidelines and local codes. Adherence to the CBC standards will ensure the
strongest structures feasible, with no increased risk to human life. Construction related
impacts will be less than significant, and no new mitigation measures are required.
Once constructed, the Project Modifications will provide greater protection from seismic
hazards and would not alter the conclusions of the PEIR. The facilities will not alter the
conclusions of the PEIR. Impacts will be less than significant, and no new mitigation
measures are required.
South Perimeter Wall
The PEIR evaluated a perimeter screening project. The Project Modifications include
construction of a perimeter wall in place of the fence and vegetated berm. Construction of
the wall foundation system requires deep soil mixing to 50 to 75-feet below ground
surface and CIDH piles to enhance the strength of the wall. Deep soil mixing will be
implemented in a 45-foot-wide strip (to a depth of 35 to 45-feet below ground surface)
parallel to the southern perimeter to provide lateral spread mitigation and to support the
wall's foundation. The modified perimeter wall will be subject to CBC standards. Once
constructed, the Project Modifications will provide greater protection from seismic
hazards and would not alter the conclusions of the PEIR. The modifications to the
perimeter screening will not alter the conclusions of the PEIR during construction or
operation.
b) Result in substantial soil erosion or the loss of topsoil?
TPAD Digester Facility
The PEIR concluded that the TPAD facility would not result in soil erosion or the loss of
topsoil since the project area is currently within a developed and paved treatment plant.
As discussed in Section 3.5.3 in the PEIR (see p.3.5-15 of the PEIR), construction
activities will be required to comply with SCAQMD Rule 403 for dust control. This will
prevent wind erosion and subsequent topsoil loss, while ensuring that construction
activities generating wind -induced soil erosion are below SCAQMD significance
thresholds. The Project Modifications would construct facilities within the same footprint
as described in the PEIR. SWPPP BMPs will be implemented to prevent erosion
associated with runoff from the project area during construction. Compliance with the
SWPPP and BMPs will prevent soil erosion and loss of topsoil as concluded in the PEIR.
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Once constructed, the new facility will capture stormwater on site that will prevent off
site erosion as concluded in the PEIR. Therefore, the modifications will not alter the
impact analysis in the PEIR; impacts will be less than significant, and no new mitigation
measures are required.
South Perimeter Wall
The PEIR concluded that implementation of construction related SWPPP BMPs would
reduce the potential for runoff and erosion. The Project Modifications to the perimeter
screening will be subject to the same SWPPP BMPs to prevent erosion associated with
runoff from the project area during construction. Compliance with the SWPPP and BMPs
will prevent soil erosion and loss of topsoil. The Project Modifications will not alter the
conclusions of the PEIR.
Once constructed, the new facility will capture stormwater on site that will prevent off
site erosion. Therefore, the modifications will not alter the impact analysis in the PEIR;
impacts will be less than significant, and no new mitigation measures are required.
c) Be located on a geologic unit or soil that is unstable, or that would become unstable
as a result of the project, and potentially result in on- or off -site landslide, lateral
spreading, subsidence, liquefaction, or collapse?
TPAD Digester Facility
The PEIR identified in Section 3.5.3 (p. 3.5-16) that the project area is not in an area that
is subject to subsidence as identified in the City of Huntington Beach General Plan (City
of Huntington Beach 2017). Therefore, no impacts related to subsidence are anticipated.
The construction of the TPAD facilities will occur within the same project footprint as
the project described in the PEIR and would comply with guidelines set by the CBC. The
Project Modifications increase protection from unstable soil hazards including CDSM as
a construction method to support foundations of the new facilities.
Once constructed, the facilities will be more resilient to geologic hazards such as
subsidence, liquefaction, collapsible soils, and lateral spreading as a result of design and
new construction methods. Impacts will be less than significant, and no new mitigation
measures are required.
South Perimeter Wall
The PEIR identified in Section 3.5-3 (p. 3.5-16) that the project area is not in an area that
is subject to subsidence as identified in the City of Huntington Beach General Plan (City
of Huntington Beach 2017). Therefore, no impacts related to subsidence are anticipated.
The new perimeter wall would be approximately in the same location as the perimeter
screening described in the PEIR. The construction of the new perimeter wall will comply
with guidelines set by the CBC which controls the design and location of facilities in
order to safeguard the public and reduce potential unstable soils impacts. The Project
Modifications will include CDSM and CIDH piles as construction methods to support
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foundations of the new wall. As a result, the Project Modifications increase protection
against unstable soils compared with the analysis in the PEIR.
Once constructed, the new wall will be resilient to geologic hazards such as subsidence,
liquefaction, collapsible soils, and lateral spreading as a result of design and construction
methods. This finding is consistent with the impact determination in the PEIR; impacts
will be less than significant, and no new mitigation measures are required.
d) Be located on expansive soil, as defined in Table 18-1-B of the Uniform Building
Code (1994), creating substantial direct or indirect risks to life or property?
TPAD Digester Facility
As discussed in Section 3.5.3 of the PEIR (p.3.4- 17), the predominate soil association
within the Plant No. 2 is the Hueneme-Bolsa Association, a near level, excessively
drained fine sand loams located on alluvial fans and floodplains. The soils are
characterized as having a moderate -to -high shrink -swell potential (City of Huntington
Beach, 2017). The construction of the TPAD facilities will comply with guidelines set by
the CBC, which controls the design and location of facilities in order to safeguard the
public and reduce potential unstable soils impacts. The Project Modifications will include
CDSM as a construction method to support foundations of the new facilities.
Once constructed, the facilities will be more resilient to geologic hazards such as
subsidence, liquefaction, collapsible soils, and lateral spreading as a result of design and
construction methods. As a result, the Project Modifications increase protection against
expansive soils compared with the analysis in the PEIR. Impacts will be less than
significant, and no new mitigation measures are required.
South Perimeter Wall
The construction of the new perimeter wall will comply with guidelines set by the CBC
which controls the design and location of facilities in order to safeguard the public and
reduce potential unstable soils impacts. The Project Modifications will include CDSM
and CIDH piles as construction methods to support foundations of the new wall.
Once constructed, the new wall will be resilient to geologic hazards such as subsidence,
liquefaction, collapsible soils, and lateral spreading as a result of design and construction
methods. As a result, the Project Modifications increase protection against expansive
soils compared with the analysis in the PEIR. Impacts will be less than significant, and no
new mitigation measures are required.
e) Have soils incapable of adequately supporting the use of septic tanks or alternative
waste water disposal systems where sewers are not available for the disposal of
waste water?
TPAD Digester Facility
The PEIR concluded that the proposed project will not include construction of septic
tanks or alternative wastewater disposal systems. The project involves construction of
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digesters and other facilities that treat wastewater. The Project Modifications to the
TPAD facilities do not alter the conclusions of the PEIR. Therefore, no new significant
impacts will occur, and no new mitigation measures are required.
South Perimeter Wall
The PEIR concluded that the proposed project will not include construction of septic
tanks or alternative wastewater disposal systems. The project involves construction of
digesters and other facilities that treat wastewater. The proposed modifications to the
TPAD facilities do not alter the conclusions of the PEIR. Therefore, no new significant
impacts will occur, and no new mitigation measures are required.
f) Directly or indirectly destroy a unique paleontological resource or site or unique
geologic feature?
TPAD Digester Facility
As discussed in Section 3.4.3 of the PEIR (p.3.4-30), there are no known fossil localities
in proposed project area. However, there are several fossil localities from older
Quaternary deposits located within the project area. These localities have yielded a wide
variety of vertebrate fossils, however; there is a low potential to uncover significant
vertebrate fossil remains during surface grading or shallow excavations. Excavations that
extend down into the older Quaternary deposits may encounter significant fossil
vertebrate specimens. Since the proposed project includes ground -disturbing activities,
there is a potential for discovery of fossils that may be considered significant
paleontological resources. If previously unknown potentially unique paleontological
resources are uncovered during excavation or construction, significant impacts could
occur. The PEIR concludes that with implementation of Mitigation Measure CUL-5
through CUL-8 as stated in Section 3.5, no significant impacts will occur. The proposed
Project Modifications to the TPAD facilities include additional equipment and structures
on site that includes excavation to similar or greater depths than proposed in the project
evaluated in the PEIR (approximately 75 feet bgs). Since the PEIR considered impacts to
depths that may encounter paleontological resources, implementation of the mitigation
measures would ensure that impacts were less than significant even if depths are deeper.
The Project Modifications will include CDSM as a new construction method to support
foundations of the new facilities. This construction method was not evaluated in the
PEIR, but will be subject to the same Mitigation Measures CUL-5 through CUL8 to
ensure impacts to paleontological resources are minimized, similar to the conclusions in
the PEIR. Since the PEIR considered the potential to encounter paleontological resources,
implementation of the mitigation measures would ensure that impacts were less than
significant. Therefore, the Modifications would not alter the conclusions of the PEIR.
Once constructed, the facilities will not affect paleontological resources. This finding is
consistent with the impact determination in the PEIR; impacts will be less than
significant, and no new mitigation measures are required.
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South Perimeter Wall
The proposed modifications to the perimeter screening include construction of a new
perimeter wall. additional equipment and structures on site. The project modifications
will include CDSM and CIDH piles as construction methods to support foundations of
the new wall. This construction method will be subject to Mitigation Measures CUL-5
through CUL-8 to ensure impacts to paleontological resources are minimized, similar to
the conclusions in the PEIR.
Once constructed, the facilities will not affect paleontological resources. This finding is
consistent with the impact determination in the PEIR; impacts will be less than
significant, and no new mitigation measures are required.
Mitigation Measures from the 2017 BMP PER:
CUL-5: Prior to start of excavation activities associated with the proposed program
that exceed 10 feet in depth in previously undisturbed sediments, OCSD shall retain a
qualified paleontologist meeting the Society for Vertebrate Paleontology (SVP)
Standards (SVP 2010) to carry out all mitigation related to paleontological resources.
The qualified paleontologist shall be selected from the list of County of Orange
certified paleontologists.
CUL-6: Prior to start of excavation activities associated with the proposed program
that exceed 10 feet in depth in previously undisturbed sediments, the qualified
paleontologist, or his or her designee, shall conduct training for construction
personnel regarding the appearance of fossils and the procedures for notifying
paleontological staff should fossils be discovered by construction staff. OCSD shall
ensure that construction personnel are made available for and attend the training and
retain documentation demonstrating attendance.
CUL-7: Paleontological resources monitoring shall be performed during excavation
activities associated with the proposed program that exceed 10 feet in depth in
previously undisturbed sediments by a qualified paleontological monitor (or cross -
trained paleontological/archaeological monitor) meeting the standards of the SVP
2010 under the direction of the qualified paleontologist. The monitor shall have the
authority to temporarily halt or divert work away from exposed fossils in order to
recover the fossil specimens. The qualified paleontologist, based on observations of
subsurface soil stratigraphy and/or other factors, may increase, reduce, or discontinue
monitoring in coordination with OCSD, as warranted.
If construction or other project personnel discover any potential fossils during
construction, regardless of the depth of work, all work shall cease at that location
(within 100 feet) until the qualified paleontologist has assessed the discovery and
made recommendations as to the appropriate treatment and re -assessed the depth at
which monitoring shall be required.
CUL-8: In the event of a fossil discovery by the paleontological monitor or
construction personnel associated with the proposed program, all work in the
immediate vicinity of the find shall cease. The qualified paleontologist shall evaluate
the find before restarting construction activity in the area. If it is determined that the
fossil(s) is (are) scientifically significant, the qualified paleontologist shall recover
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significant fossils following standard field procedures for collecting and curating
paleontological resources, as described by the SVP (2010).
Summary of Potential Effects on Geology and Soils
The proposed modifications will not result in new significant environmental effects, or result in a
substantial increase in the severity of previously identified significant effects, with respect to
geology and soils. No further environmental review is required. (Public Resources Code § 21166;
CEQA Guidelines § 15162.).
References
DOC, 1997. State of California Seismic Hazard Zones, Newport Beach Quadrangle Official Map.
April 17, 1997.
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Greenhouse Gas Emissions
Issues (and Supporting Information Sources):
VIII. GREENHOUSE GAS EMISSIONS — Would project modifications, changed
circumstances, or new information substantially increase the severity of
significant impacts identified in the previous CEQA document or result in
new significant impacts that could:
a) Generate greenhouse gas emissions, either directly or indirectly, that may
have a significant impact on the environment?
b) Conflict with an applicable plan, policy or regulation adopted for the purpose
of reducing the emissions of greenhouse gases?
Discussion
Yes
No
❑ ❑X
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Generate greenhouse gas emissions, either directly or indirectly, that may have a
significant impact on the environment
TPAD Digester Facility
As discussed in Section 3.6, Greenhouse Gas Emissions, of the PEIR, the project will
increase the energy efficiency of the facilities, and as such, will not generate a net
demand for energy from outside of Plant No. 2 that cannot be supported by the existing
CenGen facility at Plant No. 2. The Project Modifications will result in an increase of up
to one additional boiler but will not increase demand for energy compared to the project
evaluated in the PEIR. The primary fuel source for the boilers is intended to be digester
gas. Natural gas would be supplemented only if sufficient digester gas is not available;
however, it is not known if or when this would be needed. Only two of the new boilers
would operate at a time, and would do so in a lead/lag fashion, responding to heating
demands that vary throughout the day and by season. Since the primary fuel source
would be digester gas, the net demand for energy would be minimal. Therefore, the
proposed Project Modifications will not increase the net demand for energy during
operations, and therefore, no increase in the net generation of GHG emissions from the
digesters and boilers will occur. The methodology used in the PEIR to analyze the
Project's contribution to global climate change includes evaluating the total net annual
GHG emissions (construction and operational) against SCAQMD's proposed GHG
emissions efficiency threshold of 3,000 MT CO2e.
The on -site concrete batch plant will be electric -powered (i.e., mixing, conveyors, etc.),
which will result in generally minimal and temporary electricity demand. GHG emissions
related to the electricity -demand will also be minimal and temporary and will not
substantially increase the construction -related GHG emissions provided in the PEIR.
Thus, the GHG emissions for the concrete batch plant are not quantified. The concrete
batch plant will require sand, gravel, and Portland cement deliveries to the site to produce
the concrete. The material deliveries associated with the concrete batch plant and related
supplies under the Project Modifications is conservatively estimated to add up to 600
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delivery trucks, or approximately 4 to 5 trucks per day. Therefore, additional delivery
truck emissions will occur under the proposed Project Modifications and were quantified
using the CARB on -road vehicle emissions factor (EMFAC2021) model.
The use of up to three bore/drill rigs will be diesel -powered and the GHG emissions were
quantified using the California Emissions Estimator Model (CalEEMod), version
2020.4.0, using the model -provided equipment horsepower and usage factors. The
increased amount of soil export will require additional haul truck trips and the increased
GHG emissions were quantified based on the haul truck emissions from the certified
PEIR and accounting for a longer total duration of hauling to reflect the increased export
volume.
Table 6, Estimated Total Construction -Related GHG Emissions for the Project and
Modified Project, shows the increase in GHG emissions for the proposed project
modifications compared to the project. As shown, the modifications will increase
construction GHG emissions by approximately 1 percent compared to the project.
TABLE 6
ESTIMATED TOTAL CONSTRUCTION -RELATED GHG EMISSIONS FOR THE PROJECT AND MODIFIED PROJECT
Estimated CO2e Emissions
Construction Year Certified PEIR Project Addendum Modified Project
Total 19,362 (MT) 19,534 (MT)
Annual Construction (Amortized over 30 years) 645 (MT/yr) 651 (MT/yr)
Percent Increase over Project — 1 %
CO2e= carbon dioxide equivalent; MT =metric tons; MT/yr = metric tons per year.
SOURCE: ESA 2017, 2022
As discussed above, the proposed Project Modifications will not increase the net demand
for energy during operations. The addition of up to 30 workers during operations would
result in additional worker vehicle commute trips and worker commute -related GHG
emissions of approximately 68 MTCO2e per year, with declining emissions as workers
replace older vehicles with newer, less emitting vehicle models. The minor increase in
GHG emissions from the additional workers would represent less than 1 percent of the
Buildout Year 2040 with Program GHG emissions and approximately 5 percent of the net
annual GHG emissions (Year 2040 Program minus Year 2040 without Program). The
increment of GHG emissions resulting from the Project Modifications would not result in
an exceedance of the SCAQMD's threshold of 3,000 MTCO2e per year that accounts for
both construction and operational GHG emissions.
Therefore, based on the above, the proposed Project Modifications will not generate
GHG emissions, either directly or indirectly, that will result in new significant impacts, or
a substantial increase in the severity of previously identified significant impacts.
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South Perimeter Wall
The Project Modifications will include the replacement of the existing south perimeter
screening. The wall foundation system will require deep soil mixing to 50 to 75-feet
below ground surface and CIDH piles to approximately 40-feet below ground surface.
Additionally, deep soil mixing will be implemented in a 45-foot-wide strip (to a depth of
35 to 45-feet below ground surface) parallel to the Talbert Marsh wall to provide lateral
spread mitigation and to support the wall's foundation. The proposed modifications to the
existing south perimeter screening will require an on -site concrete batch plant and
bore/drill rigs, which were not considered in the PEIR.
The on -site concrete batch plant will be electric -powered (i.e., mixing, conveyors, etc.),
which will result in generally minimal and temporary electricity demand. GHG emissions
related to the electricity -demand will also be minimal and temporary and will not
increase the construction -related GHG emissions provided in the PEIR. Thus, the GHG
emissions for the concrete batch plant are not quantified. The concrete batch plant will
require sand, gravel, and Portland cement deliveries to the site to produce the concrete.
The PEIR accounted for 600 delivery trucks during construction. As discussed above, the
material deliveries associated with the concrete batch plant and related supplies under the
Project Modifications s is conservatively estimated to add up to 600 delivery trucks, or
approximately 4 to 5 trucks per day. Therefore, additional delivery truck emissions will
occur under the proposed Project Modifications and were quantified using the CARB on -
road vehicle emissions factor (EMFAC2021) model.
The use of up to three bore/drill rigs will be diesel -powered and the GHG emissions were
quantified using the California Emissions Estimator Model (CalEEMod), version
2020.4.0, using the model -provided equipment horsepower and usage factors. The
increased amount of soil export will require additional haul truck trips and the increased
GHG emissions were quantified based on the haul truck emissions from the certified
PEIR and accounting for a longer total duration of hauling to reflect the increased export
volume.
Table 6, Estimated Total Construction -Related GHG Emissions for the Project and
Modified Project, shows the increase in GHG emissions for the proposed Project
Modifications compared to the project. As shown, the modifications will increase
construction GHG emissions by approximately 1 percent compared to the project. The
increment of GHG emissions resulting from the Project Modifications would not result in
an overall exceedance of the SCAQMD's threshold of 3,000 MTCO2e per year that
accounts for both construction and operational GHG emissions.
Once constructed, the perimeter wall will not emit GHG.
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b) Conflict with an applicable plan, policy or regulation adopted for the purpose of
reducing the emissions of greenhouse gases
TPAD Digester Facility and South Perimeter Wall
The certified PEIR determined that the Project will not conflict with the CARB Scoping
Plan, Senate Bill (SB) 375, or with GHG reduction plans for both Cities in which the
Project is located. Therefore, the Project will not conflict with applicable GHG reduction
plans, policies, and regulations and impacts will be less than significant.
The Project Modifications will not result in any changes to the project that will alter the
findings in the PEIR with respect to potential conflicts with an applicable plan, policy or
regulation adopted for the purpose of reducing the emissions of GHGs. Similar to the
project, the Project Modifications will upgrade the existing biosolids treatment facilities
to improve the energy and water efficiency of the facility consistent with applicable
Recommended Actions contained in CARB's Scoping Plan, which include Actions E-1
(increased Utility Energy efficiency programs including more stringent building and
appliance standards), GB-1 (Green Building), and W-1 (Increased Water Use Efficiency).
The Project Modifications would not change the energy efficiency requirements of
buildings and operational processes that were evaluated in the PEIR. As such, the Project
Modifications, as was the case with the project as discussed in the PEIR, will not conflict
with local GHG reduction plans, policies, and regulations in the City of Fountain Valley
and the City of Huntington Beach.
During operations, the Project Modifications would add approximately 30 additional
workers beyond what was assumed in the PEIR. The approximately 30 additional
workers would also not contribute substantially to vehicle miles traveled (VMT) (refer to
Section XVII, Transportation, Item (b), below, which determined that the Project
Modifications would not result in substantial VMT). Similar to the project, the Project
Modifications will not generate a substantial long-term increase in transportation fuel
demand and would not generate substantial VMT in conflict with transportation plans
such as the Southern California Association of Governments (SCAG) Regional
Transportation Plan/Sustainable Communities Strategy (RTP/SCS). Therefore, the
Project Modifications will not conflict with employment growth projections and related
GHG emissions from worker commutes, and will not conflict with vehicle -related GHG
emission reduction targets in SB 375.
Based on the above, the Project Modifications will not conflict with applicable GHG
reduction plans, policies, and regulations and will not result in new significant impacts, or
a substantial increase in the severity of previously identified significant impacts. This
finding is consistent with the impact determination in the PEIR; construction and
operation related impacts will be less than significant, and no new mitigation measures
are required.
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Summary of Potential Effects on Greenhouse Gas Emissions
The proposed modifications will not result in new significant environmental effects, or result in a
substantial increase in the severity of previously identified significant effects, with respect to
greenhouse gas emissions. No further environmental review is required. (Public Resources Code
§ 21166; CEQA Guidelines § 15162.).
References
California Air Resources Board (CARB). 2008. Climate Change Scoping Plan. Approved
December 2008. Available at:
www.arb.ca.gov/cc/scopingplan/document/adopted_scoping_plan.pdf, Accessed September
2022.
CARB. 2022. What are Sustainable Communities Strategies. https://ww2.arb.ca.gov/our-
work/programs/sustainable-communities-program/what-are-sustainable-communities-
strategies. Accessed September 2022.
Huntington Beach. 2017. City of Huntington Beach General Plan update Program EIR. p.4.6-7.
https://www.huntingtonbeachca.gov/files/users/planningNolume-Il-Draft-Environmental-
Impact-Report.pdf. Accessed September 2022.
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Hazards and Hazardous Materials
Issues (and Supporting Information Sources):
Yes No
IX.
HAZARDS AND HAZARDOUS MATERIALS —Would project
modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA
document or result in new significant impacts that could:
a)
Create a significant hazard to the public or the environment through the
❑
routine transport, use, or disposal of hazardous materials?
b)
Create a significant hazard to the public or the environment through
❑ ❑X
reasonably foreseeable upset and accident conditions involving the release
of hazardous materials into the environment?
c)
Emit hazardous emissions or handle hazardous or acutely hazardous
❑ ❑X
materials, substances, or waste within one -quarter mile of an existing or
proposed school?
d)
Be located on a site which is included on a list of hazardous materials sites
❑ ❑X
compiled pursuant to Government Code Section 65962.5 and, as a result,
would it create a significant hazard to the public or the environment?
e)
For a project located within an airport land use plan or, where such a plan
❑ ❑X
has not been adopted, within two miles of a public airport or public use
airport, would the project result in a safety hazard or excessive noise for
people residing or working in the project area?
f)
Impair implementation of or physically interfere with an adopted emergency
❑
response plan or emergency evacuation plan?
g)
Expose people or structures, either directly or indirectly, to a significant risk of
❑X
loss, injury, or death involving wildland fires?
Discussion
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Create a significant hazard to the public or the environment through the routine
transport, use, or disposal of hazardous materials?
TPAD Digester Facility
The PEIR evaluated the use of hazardous materials needed to construct the TPAD
facilities including drilling, trenching, excavation, grading, demolition, and other ground -
disturbing activities. The PEIR noted that these construction activities will require small
amounts of routinely used hazardous materials including but not limited to petroleum
products (e.g., oil, gasoline, and diesel fuels), automotive fluids (e.g., antifreeze and
hydraulic fluids), and other chemicals (e.g., adhesives, solvents, paints, thinners, and
other chemicals). No acutely hazardous materials will be used on -site during
construction. The PEIR concluded that the materials handled will not pose a significant
risk off -site to the public. The construction contractor will be required to comply with all
applicable federal, state, and local regulations pertaining to hazardous material use,
handling, storage, and disposal, including for hazardous building materials encountered
during demolition such as lead -based paint (LBP) and asbestos containing building
materials (ACBM). Adherence to these regulations will reduce potential proposed
projects construction impacts related to hazardous materials to less than significant levels.
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The Project Modification to the TPAD facilities will employ the same construction
methods and would not alter the conclusions of the PEIR regarding hazardous materials
during construction. The additional CDSM construction method would not require the
use of hazardous materials not already evaluated in the PEIR.
The PEIR discussed in Section 3.7.3 (p. 3.7-12) that operation of the proposed TPAD
facility will require routine transport, storage, use, and disposal of hazardous materials
for purposes of treatment of biosolids. The use of hazardous materials and substances
during operation will be subject to the existing and future federal, State, and local health
and safety requirements for the handling, storage, transportation, and disposal of
hazardous materials. In addition, implementation of OC San's Integrated Emergency
Response Plan (IERP) will ensure that all chemicals are properly stored and handled to
minimize spills and protect the environment and public health. OC San's compliance
with all applicable laws, regulations and the site -specific IERP will minimize the
potential impacts to the public or environment due to routine transport, storage, and use
of hazardous materials. The proposed Project Modifications to the TPAD facility will not
alter the conclusions of the PEIR.
South Perimeter Wall
The PEIR evaluated the perimeter screening project and concluded that compliance with
all applicable laws, regulations and the site -specific IERP will minimize the potential
impacts to the public or environment due to routine transport, storage, and use of
hazardous materials. The Project Modifications to the perimeter screening project include
construction of a new wall using CDSM and CIDH pile methods. The new construction
method would not utilize hazardous materials not already presented in the PEIR.
Therefore, the project as modified will not alter the conclusions in the PEIR.
b) Create a significant hazard to the public or the environment through reasonably
foreseeable upset and accident conditions involving the release of hazardous
materials into the environment?
TPAD Digester Facility
The PEIR concludes in Section 3.7.3 (p. 3.7-12) that adherence to regulations during
construction will reduce potential proposed projects construction impacts related to
hazardous materials to less than significant levels. The modification to the TPAD
facilities will not alter the conclusions of the PEIR regarding hazardous materials during
construction.
Once constructed, the PEIR concludes that compliance with all applicable laws,
regulations and the site -specific IERP will minimize the potential impacts to the public or
environment due to routine transport, storage, and use of hazardous materials. The
proposed Project Modifications to the TPAD facility will not alter the conclusions of the
PEIR.
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South Perimeter Wall
The PEIR evaluated the perimeter screening project and concluded that compliance with
all applicable laws, regulations and the site -specific IERP will minimize the potential
impacts to the public or environment due to routine transport, storage, and use of
hazardous materials. The Project Modifications to the perimeter screening project include
construction of a new wall using CDSM and CIDH pile methods. The new construction
method would not utilize hazardous materials not already presented in the PEIR.
Therefore, the project as modified will not alter the conclusions in the PEIR.
c) Emit hazardous emissions or handle hazardous or acutely hazardous materials,
substances, or waste within one -quarter mile of an existing or proposed school?
TPAD Digester Facility
The PEIR noted that OC San Plant No. 2 is not located within 0.25 mile of a school. The
proposed modifications to the TPAD facility would occur within the same footprint as the
project evaluated in the PEIR, Therefore, the Project Modifications will not alter the
conclusions in the PEIR for construction or operation. Therefore, no new significant
impacts will occur, and no new mitigation measures are required.
South Perimeter Wall
The PEIR noted that OC San Plant No. 2 is not located within 0.25 mile of a school. The
proposed modifications to the perimeter wall will occur within approximately the same
footprint. Therefore, the Project Modifications would not alter the conclusions in the
PEIR for construction or operation. Therefore, no new significant impacts will occur, and
no new mitigation measures are required.
d) Be located on a site which is included on a list of hazardous materials sites compiled
pursuant to Government Code Section 65962.5 and, as a result, would it create a
significant hazard to the public or the environment?
TPAD Digester Facility and South Perimeter Wall
The PEIR concludes that a database search of hazardous materials sites using the online
State Water Resources Control Board (SWRCB) GeoTracker databases identified Plant
No. 2 as having two closed leaking underground storage tank (LUST) cases and closed
cleanup program site. The proposed Project Modifications would be located within Plant
No. 2 and would not be located within a listed hazardous material site (SWRCB 2022).
The proposed Project Modifications to the TPAD facility and perimeter wall would occur
within the same approximate footprint as the project evaluated in the PEIR, therefore; the
Project Modifications will not alter the conclusions in the PEIR for construction or
operation. Therefore, no new significant impacts will occur, and no new mitigation
measures are required.
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e) For a project located within an airport land use plan or, where such a plan has not
been adopted, within two miles of a public airport or public use airport, would the
project result in a safety hazard or excessive noise for people residing or working in
the project area?
TPAD Digester Facility and South Perimeter Wall
The PEIR concluded that the nearest airport to the project area is the John Wayne
Airport, located approximately 8 miles to the northeast of Plant No. 2, at 18601 Airport
Way in the unincorporated area of the Orange County. Therefore, the TPAD facilities and
south perimeter wall are not located within an airport land use plan or within 2 miles of a
public airport or public use airport. No new significant impacts will occur, and no new
mitigation measures are required.
f) Impair implementation of or physically interfere with an adopted emergency
response plan or emergency evacuation plan?
TPAD Digester Facility
The PEIR concluded that since the TPAD Digester Facility will be constructed within the
treatment plant, neither construction nor operation will require temporary lane or
roadway closures or block access to roadways and driveways for emergency vehicles.
Truck trips will not require closure of any roadways and will only temporary slow traffic
near the treatment plant site. The proposed modifications to the TPAD facility would
occur within the same footprint as the project evaluated in the PEIR. The proposed
Project Modifications will increase delivery trips, but will not physically interfere with an
adopted emergency response plan or emergency evacuation plant. All project facilities
will be contained within the boundaries of the treatment plant and project -related vehicles
will not block existing street access to the sites. Therefore, the project as modified will
not result in any new significant impacts, and no new mitigation measures are required.
The PEIR concluded that operation of the proposed TPAD facility as modified will not
impair or physically interfere with an adopted emergency response plan or emergency
evacuation plan. The proposed Project Modifications will increase delivery trips, but will
not physically interfere with an adopted emergency response plan or emergency
evacuation plant. Therefore, the project as modified would not alter the conclusions of
the PEIR. Construction and operation related impacts will be less than significant, and no
new mitigation measures are required.
South Perimeter Wall
The PEIR concluded that construction of the perimeter screening project would not
require temporary lane or roadway closures or block access to roadways and driveways
for emergency vehicles. The Project Modifications would construct a new wall at the
southern boundary of the treatment plant requiring temporary closure of the bike path.
The bike path is not an adopted emergency response or evacuation route. Temporary
detours shown in Figure 6 would ensure that bike circulation and County vehicles could
connect Brookhurst Avenue with the Santa Ana River Trail. For these reasons, the
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Project Modifications will not alter the conclusion in the PEIR. Construction related
impacts will be less than significant, and no new mitigation measures are required.
Operation of the proposed perimeter wall will not impair or physically interfere with an
adopted emergency response plan or emergency evacuation plan. This finding is
consistent with the impact determination in the PEIR; construction and operation related
impacts will be less than significant, and no new mitigation measures are required.
g) Expose people or structures, either directly or indirectly, to a significant risk of loss,
injury, or death involving wildland fires?
TPAD Digester Facility and South Perimeter Wall
The PEIR concluded that the project site located within the developed Plant No. 2 is not
within or in the vicinity of a high fire hazard zone. The project area is not located
adjacent to wildlands or near a substantial amount of dry brush that could expose people
to wildfire risks. The Project Modifications would occur within the same footprint
evaluated in the PEIR. Therefore, the proposed construction and operation of the TPAD
facilities and south perimeter wall as modified will not alter the conclusions of the PEIR.
Summary of Potential Effects on Hazards and Hazardous Materials
The proposed modifications will not result in new significant environmental effects, or result in a
substantial increase in the severity of previously identified significant effects, with respect to
hazards and hazardous materials. No further environmental review is required. (Public Resources
Code § 21166; CEQA Guidelines § 15162.)
References
Department of Toxic Substances Control (DTSC), 2022. EnviroStor Database. Available at:
https://www.envirostor.dtsc.ca.gov/public/map/?myaddress=Sacramento&tour=True,
accessed August 31, 2022.
State Water Resources Control Board (SWRCB), 2022. GeoTracker. Available at:
https://geotracker.waterboards.ca.gov/map/?CMD=runreport&myaddress=Sacramento,
accessed August 31, 2022.
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Hydrology and Water Quality
Issues (and Supporting Information Sources): Yes No Impact
X. HYDROLOGY AND WATER QUALITY — Would project modifications,
changed circumstances, or new information substantially increase the
severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Violate any water quality standards or waste discharge requirements or ❑ ❑X
otherwise substantially degrade surface or ground water quality?
b) Substantially decrease groundwater supplies or interfere substantially with ❑ ❑X
groundwater recharge such that the project may impede sustainable
groundwater management of the basin?
c) Substantially alter the existing drainage pattern of the site or area, including
through the alteration of the course of a stream or river or through the
addition of impervious surfaces, in a manner which would:
i) result in substantial erosion or siltation on- or off -site;
❑
❑X
ii) substantially increase the rate or amount of surface runoff in a manner
❑
❑X
which would result in flooding on- or offsite;
iii) create or contribute runoff water which would exceed the capacity of
❑
❑X
existing or planned stormwater drainage systems or provide substantial
additional sources of polluted runoff; or
iv) impede or redirect flood flows?
❑
❑X
d) In flood hazard, tsunami, or seiche zones, risk release of pollutants due to ❑ ❑X
project inundation?
e) Conflict with or obstruct implementation of a water quality control plan or ❑
sustainable groundwater management plan?
Discussion
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Violate any water quality standards or waste discharge requirements or otherwise
substantially degrade surface or ground water quality?
TPAD Digester Facility
The PEIR noted in Section 3.8.3 (p. 3.8-11) that construction of the proposed TPAD
facility will be subject to a General Construction Permit under the NPDES permit project
of the federal Clean Water Act. Implementation of a SWPPP and BMPs will ensure that
the water quality impacts related to the handling of hazardous materials from proposed
project construction will be less than significant. In addition, excavation and construction
may require groundwater dewatering. If dewatering is necessary, the project will comply
with a Santa Ana Regional Water Quality Control Board (SARWQCB) Groundwater
Dewatering General Permit and will not elevate pollutant concentrations beyond existing
water quality limitations. The proposed Project Modifications will be subject to the same
stormwater and dewatering regulations, and would not alter the conclusions in the PEIR.
No new significant impacts will occur, and no new mitigation measures are required.
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Once constructed, the site will capture stormwater on site as is currently the case. The
proposed Project Modifications will not alter this conclusion. No new significant impacts
will occur, and no new mitigation measures are required.
South Perimeter Wall
Similar to the TPAD construction, the perimeter wall construction activities will be
subject to a SWPPP and BMPs. Implementation of BMPs will ensure that the
construction activities will be protective of water quality standards. The proposed Project
Modifications will be subject to the same stormwater and dewatering regulations, and
would not alter the conclusions in the PEIR. No new significant impacts will occur, and
no new mitigation measures are required.
Once constructed, the site will capture stormwater on site as is currently the case. The
proposed modifications will not alter this conclusion. No new significant impacts will
occur, and no new mitigation measures are required.
b) Substantially decrease groundwater supplies or interfere substantially with
groundwater recharge such that the project may impede sustainable groundwater
management of the basin?
TPAD Digester Facility and South Perimeter Wall
The PEIR concludes in Section 3.8.3 (p. 3.8-14) that construction of the TPAD facility
would not affect groundwater supplies. The PEIR noted that excavation could encounter
groundwater during construction and that dewatering may be required to complete
excavation and construction. The PEIR concluded that dewatering during construction in
this area will not directly interfere with groundwater supplies or interfere substantially
with groundwater recharge. The proposed Project Modifications will be located in the
same location and will be subject to the same dewatering regulations. The TPAD
facilities and south perimeter wall as modified would not alter the conclusions in the
PEIR. No new significant impacts will occur, and no new mitigation measures are
required. The proposed modifications to the TPAD facilities and south perimeter wall
will not alter this conclusion.
Operation of the TPAD facility and south perimeter wall as modified will have no direct
effect on groundwater supplies or interfere with groundwater recharge such that there will
be a net deficit in aquifer volume or a lowering of the local groundwater table. This
finding is consistent with the impact determination in the PEIR (p. 3.8-14); no new
significant impacts will occur, and no new mitigation measures are required.
c.i) result in substantial erosion or siltation on- or off -site
TPAD Digester Facility
The PEIR concluded that the TPAD facility would not result in soil erosion or the loss of
topsoil since the project area is currently within a developed and paved treatment plant.
As discussed in Section 3.5.3 in the PEIR (see p.3.5-15 of the PEIR), construction
activities will be required to comply with SCAQMD Rule 403 for dust control. This will
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prevent wind erosion and subsequent topsoil loss, while ensuring that construction
activities generating wind -induced soil erosion are below SCAQMD significance
thresholds. The PEIR concludes that compliance with the SWPPP will prevent erosion
associated with runoff from the project area during construction. Compliance with the
SWPPP and BMPs will prevent soil erosion and loss of topsoil. The proposed Project
Modifications will be subject to the same stormwater regulations, and would not alter the
conclusions in the PEIR. No new significant impacts will occur, and no new mitigation
measures are required.
Once constructed, the new facility will capture stormwater on site that will prevent off
site erosion. Therefore, the Project Modifications will not alter the impact analysis within
the PEIR; impacts will be less than significant, and no new mitigation measures are
required.
South Perimeter Wall
The PEIR concluded that implementation of construction related SWPPP BMPs would
reduce the potential for runoff and erosion. The modifications to the perimeter screening
project involves construction of a new perimeter wall. OC San will implement an SWPPP
to prevent erosion associated with runoff from the project area during construction.
Compliance with the SWPPP and BMPs will prevent soil erosion and loss of topsoil. The
proposed Project Modifications will be subject to the same stormwater regulations, and
would not alter the conclusions in the PEIR. No new significant impacts will occur, and
no new mitigation measures are required.
Once constructed, the new facility will capture stormwater on site that will prevent off
site erosion. Therefore, the modifications will not alter the impact analysis of the PEIR;
impacts will be less than significant, and no new mitigation measures are required.
c.ii) substantially increase the rate or amount of surface runoff in a manner which would
result in flooding on- or offsite
TPAD Digester Facility
The PEIR concluded that the TPAD facility would not increase the rate or amount of
surface runoff. During construction, compliance with the SWPPP and BMPs will prevent
runoff. The proposed Project Modifications will be located in the same location as the
project evaluated in the PEIR, subject to the same stormwater regulations, and would not
alter the conclusions in the PEIR. No new significant impacts will occur, and no new
mitigation measures are required.
Once constructed, the new facility will capture stormwater on site that will prevent offsite
runoff; impacts will be less than significant, and no new mitigation measures are
required.
South Perimeter Wall
The PEIR concluded that the perimeter screening project would not increase runoff. The
modifications to the perimeter screening project involves construction of a new perimeter
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wall. The proposed Project Modifications will be subject to the same stormwater
regulations, and would not alter the conclusions in the PEIR. No new significant impacts
will occur, and no new mitigation measures are required.
Once constructed, the new facility will capture stormwater on site that will prevent offsite
runoff. Therefore, the modifications will not alter the impact analysis in the PEIR;
impacts will be less than significant, and no new mitigation measures are required.
c.iii) create or contribute runoff water which would exceed the capacity of existing or
planned stormwater drainage systems or provide substantial additional sources of
polluted runoff
TPAD Digester Facility
The PEIR concluded that the TPAD facility would not contribute to off -site surface
runoff. During construction, runoff will be captured on site. The proposed Project
Modifications will be located in the same location as the project evaluated in the PEIR,
subject to the same stormwater regulations, and would not alter the conclusions in the
PEIR. No new significant impacts will occur, and no new mitigation measures are
required.
Once constructed, the new facility will capture stormwater on site that will prevent offsite
runoff, impacts will be less than significant, and no new mitigation measures are
required.
South Perimeter Wall
The PEIR concluded that the perimeter screening project will not increase runoff. The
Project Modifications to the perimeter screening project involve construction of a new
perimeter wall. The proposed Project Modifications will be subject to the same
stormwater regulations, and would not alter the conclusions in the PEIR. No new
significant impacts will occur, and no new mitigation measures are required.
Once constructed, the new facility will capture stormwater on site that will prevent offsite
runoff. Therefore, the modifications will not alter the impact analysis in the PEIR;
impacts will be less than significant, and no new mitigation measures are required.
c.iv) impede or redirect flood flows
TPAD Digester Facility
The PEIR concluded that the TPAD facility would not impede or redirect flood flows.
During construction, runoff will be captured on site. The proposed Project Modifications
will be located in the same location as the project evaluated in the PEIR, subject to the
same stormwater regulations, and would not alter the conclusions in the PEIR. No new
significant impacts will occur, and no new mitigation measures are required.
Once constructed, the new facility will capture stormwater on site; impacts will be less
than significant, and no new mitigation measures are required.
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South Perimeter Wall
The PEIR concluded that the perimeter screening project would not impede or redirect
flood flows. The modifications to the perimeter screening project involves construction of
a new perimeter wall at approximately the same location, subject to the same stormwater
regulations, and would not alter the conclusions in the PEIR. No new significant impacts
will occur, and no new mitigation measures are required.
Once constructed, the new wall will protect the treatment plant from future wave run-up
including a tsunami wave. The wall is designed to re -direct wave run up and diffuse the
wave energy (Moffatt & Nichol, 2021). OC San has conducted an assessment on the
effect to neighboring land uses from the installation of the new wall and has concluded
that most of the energy from the wave run up will be reflected back toward the ocean, and
will not reflect laterally toward neighboring and uses. The assessment revealed some
minor street flooding would occur in the vicinity of Plant No. 2 (Moffatt & Nichol,
2022). Therefore, the Project Modifications will not alter the impact analysis in the PEIR;
impacts will be less than significant, and no new mitigation measures are required.
d) In flood hazard, tsunami, or seiche zones, risk release of pollutants due to project
inundation?
TPAD Digester Facility
The PEIR describes in Section 3.8.3 that the project area is located adjacent to the Santa
Ana River, the Pacific Ocean, and Talbert Marsh. The U.S. Army Corps of Engineers
completed the flood protection walls and levees in 1995. The project area is located
within the 500-year floodplain, or Zone X, "Reduced Risk Due to Levees" location. No
closed bodies of water are located near the project area. The proposed Project
Modifications will be located in the same location as the project evaluated in the PEIR.
Therefore, the Project Modifications do not alter the conclusions in the PEIR that the
project will not expose people or structures to a significant risk of loss, injury or death
involving inundation by seiche.
South Perimeter Wall
The PEIR concluded that the implementation of the BMP projects would not change the
risk of inundation from sea level rise or tsunami on vital public infrastructure compared
to existing conditions (see p.3.8-19 of the PEIR). The modifications to the perimeter
screening project involves construction of a new perimeter wall. Construction activities
will not alter the conclusions of the PEIR.
Once constructed, the new facility will protect the treatment plant from future wave run-
up including a tsunami wave. The wall is designed to re -direct wave run up and diffuse
the wave energy (Moffatt & Nichol, 2022a). OC San has conducted an assessment on the
effect to neighboring land uses from the installation of the new wall and has concluded
that most of the energy from the wave run up will be reflected back toward the ocean, and
will not reflect laterally toward neighboring and uses. The assessment revealed some
minor street flooding would occur in the vicinity of Plant No. 2 (Moffatt & Nichol,
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2022b). Therefore, the modifications will not alter the impact analysis in the PEIR;
impacts will be less than significant, and no new mitigation measures are required.
e) Conflict with or obstruct implementation of a water quality control plan or
sustainable groundwater management plan?
TPAD Digester Facility and South Perimeter Wall
The PEIR concludes that the TPAD facility and perimeter screening would not conflict
with a water quality control plan or sustainable groundwater management plan. The
proposed Project Modifications to the TPAD facility would be subject to the same
regulations and management plans and therefore, will not alter this conclusion for either
construction or operation. No new significant impacts will occur, and no new mitigation
measures are required.
Summary of Potential Effects on Hydrology and Water Quality
The proposed modifications will not result in new significant environmental effects, or result in a
substantial increase in the severity of previously identified significant effects, with respect to
hydrology and water quality. No further environmental review is required. (Public Resources
Code § 21166; CEQA Guidelines § 15162.)
References
Moffatt & Nichol, 2022a. Perimeter Screening Wall Basis of Design, July 15, 2022.
Moffat & Nichol, 2022b. Tsunami Modeling and Load Calculations, July 15, 2022.
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Land Use and Planning
Issues (and Supporting Information Sources):
XI. LAND USE AND PLANNING — Would project modifications, changed
circumstances, or new information substantially increase the severity of
significant impacts identified in the previous CEQA document or result in
new significant impacts that could:
a) Physically divide an established community?
b) Cause a significant environmental impact due to a conflict with any land use
plan, policy, or regulation adopted for the purpose of avoiding or mitigating
an environmental effect?
Discussion
Yes
No
❑
❑X
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Physically divide an established community?
TPAD Digester Facility and South Perimeter Wall
The PEIR concludes that the construction of new treatment facilities within the existing
treatment plant would not physically divide an established community. The proposed
Project Modifications do not propose any action that could divide an established
community. The physical division of an established community generally refers to the
construction of a feature such as an interstate highway or railroad tracks, or removal of a
means of access, such as a local road or bridge that will impact mobility within an
existing community or between a community and outlying area. Given the proposed
project will construct facilities in the existing OC San Plant No. 2 property, the proposed
Project Modifications will not alter the conclusions of the PEIR, and no new mitigation
measures are required.
b) Cause a significant environmental impact due to a conflict with any land use plan,
policy, or regulation adopted for the purpose of avoiding or mitigating an
environmental effect?
TPAD Digester Facility and South Perimeter Wall
The project site is located within the City of Huntington Beach's Coastal Zone and is
subject to the Local Coastal Plan (LCP). Under the implementation program of the LCP,
the project site is zoned for Industrial Limited (IL). The LCP and City of Huntington
Beach General Plan Policy LU 13.18 requires the design and development to be
compatible in scale, mass, character, and architecture with existing buildings and design
characteristics prescribed by the General Plan. The PEIR provided an analysis of the
BMP Master Plan consistency with the LCP finding all elements of the Program to be
consistent with the goals and policies of the LCP.
The Project Modifications have refined the height of the Thermophilic Digesters to be
approximately 40 feet tall with additional 10 feet of appurtenant equipment on the roofs,
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totaling approximately 50 feet in height measured from the highest point of the curb
along the front property line (e.g., curb of sidewalk of Brookhurst Street). The PEIR
described the TPAD facility with a 40-foot roof height. The LCP allows for 40 feet high
roof levels with an additional 10 feet allowed for appurtenant equipment with an
approved CUP. As a result, the modified TPAD facility will be consistent with the
General Plan and LCP and will require a CUP and Coastal Development Permit (CDP)
from the City of Huntington Beach, similar to the conclusions in the PEIR. No new
significant impacts will occur, and no new mitigation measures are required.
The PEIR described the perimeter screening project to be consistent with the LCP. The
Project Modifications includes an 8-foot at the minimum new perimeter wall. Since the
wall would be constructed within the coastal zone covered by the LCP, the new wall is
subject to a CDP from the City of Huntington Beach. The Project Modifications would
not alter the conclusions of the PEIR. No new significant impacts will occur, and no new
mitigation measures are required.
Summary of Potential Effects on Land Use
The proposed modifications will not result in new significant environmental effects, or result in a
substantial increase in the severity of previously identified significant effects, with respect to land
use. No further environmental review is required. (Public Resources Code § 21166; CEQA
Guidelines § 15162.)
References
City of Huntington Beach (CHB), 2022a. Municipal Code. Available at:
https:Hlibrary. gcode.us/lib/huntington_beach_Ca/pub/municipal_code/item/zoning_code-
title_21-chapter_212-212_06, accessed on 28 July, 2022.
CHB, 2022b. Municipal Code Article III. Available at:
https:Hlibrary. gcode.us/lib/huntington_beach_Ca/pub/municipal_code/item/zoning_code-
title_23-chapter_230-article_iii-230_72, accessed on September 1, 2022.
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Mineral Resources
Issues (and Supporting Information Sources):
XII. MINERAL RESOURCES —Would project modifications, changed
circumstances, or new information substantially increase the severity of
significant impacts identified in the previous CEQA document or result in
new significant impacts that could:
a) Result in the loss of availability of a known mineral resource that would be
of value to the region and the residents of the state?
b) Result in the loss of availability of a locally -important mineral resource
recovery site delineated on a local general plan, specific plan, or other land
use plan?
Discussion
Yes
No
❑ ❑X
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Result in the loss of availability of a known mineral resource that would be of value
to the region and the residents of the state?
TPAD Digester Facility and South Perimeter Wall
The PEIR notes that the project area is not within a mineral resource area and does not
have a history of mineral extraction uses (CHB 2017). The State of California
Department of Conservation, Division of Oil, Gas, and Geothermal Resources identify 18
abandoned oil wells on Plant No. 2. These wells are "plugged" and therefore are no
longer active (DOC 2022). The PEIR concludes that construction of the TPAD facility
would not interfere with known mineral resources. The Project Modifications would not
change the location of the proposed project. As a result, the TPAD facility and perimeter
wall as modified will not alter the conclusions in the PEIR. No new significant impacts
will occur, and no new mitigation measures are required.
b) Result in the loss of availability of a locally -important mineral resource recovery site
delineated on a local general plan, specific plan, or other land use plan?
TPAD Digester Facility and South Perimeter Wall
As noted in the PEIR, the TPAD facility and perimeter screening would not result in the
loss of locally important mineral resource recovery site as delineated in a local general plan
or specific plan. The proposed TPAD facility and perimeter wall as modified will occur
within approximately the same footprint and would not alter the conclusions in the PEIR.
No new significant impacts will occur, and no new mitigation measures are required.
Summary of Potential Effects on Mineral Resources
The proposed modifications will not result in new significant environmental effects, or result in a
substantial increase in the severity of previously identified significant effects, with respect to
mineral resources. No further environmental review is required. (Public Resources Code § 21166;
CEQA Guidelines § 15162.)
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References
California Department of Conservation (DOC), 2022. Well Finder. Available at:
https://maps.conservation.ca.gov/doggr/wellfinder/#openModal/-1 17.95923/33.63 871 / 15,
accessed September 1, 2022.
City of Huntington Beach (CHB), 2017. Environmental Resources and Conservation. Available at:
https://www.huntingtonbeachca.gov/files/users/planning/environmental resources_conservati
on element.pdf, accessed September 1, 2022.
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Noise
Issues (and Supporting Information Sources):
XIII. NOISE —Would project modifications, changed circumstances, or new
information substantially increase the severity of significant impacts
identified in the previous CEQA document or result in new significant
impacts that could:
a) Generate a substantial temporary or permanent increase in ambient noise
levels in the vicinity of the project in excess of standards established in the
local general plan or noise ordinance, or applicable standards of other
agencies?
b) Generate excessive groundborne vibration or groundborne noise levels?
c) For a project located within the vicinity of a private airstrip or an airport
land use plan or, where such a plan has not been adopted, within two
miles of a public airport or public use airport, would the project expose
people residing or working in the project area to excessive noise levels?
Discussion
Yes
No
❑
N
❑ N
❑ N
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Generate a substantial temporary or permanent increase in ambient noise levels in
the vicinity of the project in excess of standards established in the local general plan
or noise ordinance, or applicable standards of other agencies?
TPAD Digester Facility and South Perimeter Wall
The PEIR concluded that construction of the TPAD facility and perimeter screening
would not result in significant noise impacts. The proposed Project Modifications will
utilize similar construction methods and would not alter the conclusions of the PEIR. The
introduction of the CDSM activities will require a concrete batch plant during
construction. The concrete batch plant will require sand, gravel, and Portland cement
deliveries to the site to produce the concrete. The material deliveries associated with the
concrete batch plant under the Project Modifications will add 600 delivery truck trips on
top of those accounted for in the PEIR. With the original 6OO truck trips plus the baseline
traffic volumes as the new base, these 600 new truck trips will result in less than 3 dBA
increase in traffic noise along the access roads. Therefore, the Project Modifications will
not generate substantial additional noise in any particular day from delivery truck trips,
beyond what was evaluated in the PEIR. No new significant impacts will occur, and no
new mitigation measures are required.
The concrete batch plant and bore/drill rig will be new sources of noise not considered in
the PEIR. The batch plant and drill rig will generate noise levels of approximately 76
dBA and 78 dBA, respectively, at a reference distance of 50 feet and accounting for
acoustical usage factors, which represents the average equipment usage in a typical
hour.3 At a distance of 120 feet, the noise levels will be reduced to approximately 68.4
3 Based on the Federal Highway Administration Roadway Construction Noise Model.
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dBA and 70.4 dBA, respectively. The combined noise level will be 72.5 dBA. When
adding this to the maximum noise level in the PEIR (i.e., 78 dBA), the noise level will be
approximately 79 dBA. Similar to the project, the Project Modifications will comply with
the allowable construction hours of the Huntington Beach Municipal Code (HBMC) as
well as the construction hours identified in the Costa Mesa Municipal Code related to use
of haul routes. Therefore, on -site and off -site construction noise will be less than
significant and the Project Modifications will not result in substantial changes to noise,
cause new significant environmental effects, or result in a substantial increase in the
severity of previously identified significant effects, with respect to noise.
Operation of the Project Modifications will not result in substantial changes in the types
of noise -generating equipment or processes compared to the project. As discussed above,
the PEIR determined that operation of the project will generate a noise level of 34 dBA at
the nearest noise sensitive uses along Brookhurst Street, which will not exceed the
significance threshold of 61 dBA (the average nighttime ambient noise level as shown in
Table 3.10-1 of the PEIR). The proposed Project Modification would not change the type
of facilities that were analyzed in the PEIR. The Project Modifications would be located
in the same area of Plant No. 2 as the facilities analyzed in the PEIR that resulted in an
operational noise level of 34 dBA. As a result, the proposed Project Modifications will
generate a similar noise level at the nearest noise sensitive uses along Brookhurst Street
and will also not exceed the significance threshold. Therefore, on -site and off -site
operational noise will be less than significant and the proposed Project Modifications will
not result in substantial changes to noise, cause new significant environmental effects, or
result in a substantial increase in the severity of previously identified significant effects,
with respect to noise. This finding is consistent with the impact determination in the
PEIR; no new significant impacts will occur, and no new mitigation measures are
required.
b) Generate excessive groundborne vibration or groundborne noise levels?
TPAD Digester Facility and South Perimeter Wall
The PEIR concluded that construction would not result in significant groundborne
vibration or noise. The Project Modifications will include a concrete batch plant and
bore/drill rig, which will be new sources of vibration not considered in the PEIR. In
addition, shoring will occur, with auger in soldier piles instead of sheeting that would be
pressed/vibrated into place. As provided in Table 3.10-12 of the PEIR, vibration levels
for loaded trucks that will be used to deliver concrete materials will be 0.076 in/sec PPV
at a reference distance of 25 feet. Vibration levels for a bore/drill rig will be 0.089 in/sec
PPV at a reference distance of 25 feet. These vibration levels will be less than the
maximum vibration level considered in the PEIR for impact pile driving of 0.644 in/sec
at a reference distance of 25 feet. Therefore, the Project Modifications will not generate
vibration levels in excess of that analyzed in the PEIR. Therefore, construction of the
modifications will have a less than significant vibration impact on the nearest vibration -
sensitive receptors. This finding is consistent with the impact determination in the PEIR;
no new significant impacts will occur, and no new mitigation measures are required.
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The PEIR concluded that operation would not result in significant vibration or
groundborne noise. Similar to the project, the Project Modifications will include the
operation of typical commercial -grade stationary mechanical and electrical equipment,
such as pumps and exhaust fans, which will produce vibration up to 0.006 in/sec PPV at
the residences along Brookhurst Street west of Plant No. 2. Operation of the Project
Modifications will not exceed the 0.5 in/sec PPV threshold for building damage and 0.04
in/sec PPV threshold for human annoyance. Therefore, operation will have a less than
significant vibration impact on the nearest vibration -sensitive receptors. This finding is
consistent with the impact determination in the PEIR; no new significant impacts will
occur, and no new mitigation measures are required.
c) For a project located within the vicinity of a private airstrip or an airport land use
plan or, where such a plan has not been adopted, within two miles of a public
airport or public use airport, would the project expose people residing or working in
the project area to excessive noise levels?
TPAD Digester Facility and South Perimeter Wall
The TPAD facility and perimeter wall will be located in the same location evaluated in
the PEIR and will not be located within an airport land use plan or within 2 miles of a
public airport or public use airport. No new significant impacts will occur, and no new
mitigation measures are required.
Summary of Potential Effects on Noise
The proposed modifications will not result in new significant environmental effects, or result in a
substantial increase in the severity of previously identified significant effects, with respect to
noise. No further environmental review is required. (Public Resources Code § 21166; CEQA
Guidelines § 15162.)
References
California Department of Transportation (Caltrans). 2013a. Technical Noise Supplement (TeNS).
September 2013.
Caltrans. 2013b. Transportation and Construction Vibration Guidance Manual. September 2013.
City of Fountain Valley. 1995. General Plan Noise Element.
City of Fountain Valley. 2017. Municipal Code, Section 6.28.
City of Huntington Beach. 1995. General Plan Noise Element.
City of Huntington Beach. 2017. Municipal Code, Section 8.40.
Federal Highway Administration (FHWA). 2006. Roadway Construction Noise Model User's
Guide.
Federal Transit Administration (FTA). 2006. Transit Noise and Vibration Impact Assessment,
May 2006.
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Occupation Safety and Health Administration (OSHA). 2017. Occupational Safety and Health
Standards, Part 1910.95. Available at:
https://www.osha.gov/pls/oshaweb/owadisp. show_document?p_table=standards&p_id=973
5, accessed on September 29, 2017.
United States Environmental Protection Agency (USEPA). 1974. EPA Identifies Noise Levels
Affecting Health and Welfare. April 1974.
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Population and Housing
Issues (and Supporting Information Sources):
XIV. POPULATION AND HOUSING —Would project modifications, changed
circumstances, or new information substantially increase the severity of
significant impacts identified in the previous CEQA document or result in
new significant impacts that could:
a) Induce substantial unplanned population growth in an area, either directly
(for example, by proposing new homes and businesses) or indirectly (for
example, through extension of roads or other infrastructure)?
b) Displace substantial numbers of existing people or housing, necessitating
the construction of replacement housing elsewhere?
Discussion
Yes
No
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Induce substantial unplanned population growth in an area, either directly (for
example, by proposing new homes and businesses) or indirectly (for example,
through extension of roads or other infrastructure)?
TPAD Digester Facility and South Perimeter Wall
The PEIR concluded that the BMP Master Plan would not induce population growth
directly or indirectly. The proposed Project Modification would not change or add any
additional facilities beyond what was analyzed in the PEIR. The proposed Project
Modifications would not include any additional facilities that would increase capacity of
the treatment plant or accommodate unplanned growth and would be consistent with the
PEIR Program Objectives of replacing aging facilities and mitigating the structural and
seismic risks for onsite biosolids structures. The Project Modifications will not alter the
conclusions in the PEIR. No new significant impacts will occur, and no new mitigation
measures are required.
b) Displace substantial numbers of existing people or housing, necessitating the
construction of replacement housing elsewhere?
TPAD Digester Facility and South Perimeter Wall
The PEIR concluded that the BMP Master Plan would not displace people or housing.
The Proposed Modifications will occur within the same footprint and will not remove
housing or displace people, necessitating the construction of replacement housing
elsewhere. Therefore, no new significant impacts will occur, and no new mitigation
measures are required.
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Summary of Potential Effects on Population and Housing
The proposed modifications will not result in new significant environmental effects, or result in a
substantial increase in the severity of previously identified significant effects, with respect to
population and housing. No further environmental review is required. (Public Resources Code §
21166; CEQA Guidelines § 15162.)
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Public Services
Issues (and Supporting Information Sources):
XV. PUBLIC SERVICES —
a) Would project modifications, changed circumstances, or new information
substantially increase the severity of significant impacts identified in the
previous CEQA document or result in new significant impacts due to
changed circumstances or new information for any of the following public
services:
i) Fire protection?
ii) Police protection?
iii) Schools?
iv) Parks?
v) Other public facilities?
Discussion
Yes No
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts due to changed circumstances or new information for any
of the following public services:
a.i, ii, iii, iv, v) Fire Protection, Police Protection, Schools, Parks, Other Public Facilities
TPAD Digester Facility and South Perimeter Wall
The PEIR evaluated the project's effect on fire, police, schools, parks, and other facilities.
The Huntington Beach Fire Department (HBFD) provides fire protection within the City
(CHB 2022a). The nearest station to the project area is Station 4 located approximately 1
mile northwest at 21441 Magnolia Street. The City of Huntington Beach is provided with
police protection services by the Huntington Beach Police Department (HBFD) (CHB
2022b). The police station is located 3.5 miles northwest of the project area at 2000 Main
Street. The project area lies within the Huntington Beach Union High School District
(HBUHSD) service area (HBUHSD 2022).
The PEIR concluded that the TPAD facility and perimeter screening project would not
change existing demand for fire protection services, police services, schools, parks, or
other public facilities, since the project will not result in a substantial increase in
employees or population. During construction of the proposed Project Modification,
construction employees would be drawn from the surrounding areas and would be
temporary and not induce population growth. The proposed Project Modification would
include minor increase in employees of up to 30 employees; however, the increase in
workers would not increase the need for new fire department staff or new facilities, and
because no new facilities will be required, no construction impacts due to new facilities
will occur. No new significant impacts will occur, and no new mitigation measures are
required.
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Summary of Potential Effects on Public Services
The proposed modifications will not result in new significant environmental effects, or result in a
substantial increase in the severity of previously identified significant effects, with respect to
public services. No further environmental review is required. (Public Resources Code § 21166;
CEQA Guidelines § 15162.)
References
City of Huntington Beach (CHB), 2022a. Fire Department. Available at:
http://www.huntingtonbeachca.gov/government/departments/fire/, accessed September 1,
2022.
CHB, 2022b. Police Department. Available at:
http://www.huntingtonbeachca.gov/government/departments/pd/, accessed September 1,
2022.
Huntington Beach Union High School District (HBUHSD), 2022. Huntington Beach Union High
School District. Available at: http://www.hbuhsd.edu/, accessed September 1, 2022.
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Recreation
Issues (and Supporting Information Sources): Yes No
XVI. RECREATION — Would project modifications, changed circumstances, or
new information substantially increase the severity of significant impacts
identified in the previous CEQA document or result in new significant
impacts that could:
a) Increase the use of existing neighborhood and regional parks or other ❑ ❑X
recreational facilities such that substantial physical deterioration of the facility
would occur or be accelerated?
b) Include recreational facilities or require the construction or expansion of ❑ ❑X
recreational facilities which might have an adverse physical effect on the
environment?
Discussion
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Increase the use of existing neighborhood and regional parks or other recreational
facilities such that substantial physical deterioration of the facility would occur or
be accelerated?
TPAD Digester Facility
The PEIR identifies that the City of Huntington Beach maintains the parks and provides
recreational services. The nearest recreational facility is the Santa Ana River Trail and
Talbert Marsh bike path located adjacent to Plant No. 2. The PEIR concludes that the
TPAD facility would not affect recreation areas in the city. The modifications to the
TPAD facility will not alter this conclusion. No new significant impacts will occur, and
no new mitigation measures are required.
South Perimeter Wall
The PEIR concludes that the perimeter screening project would not result in substantial
deterioration to neighborhood or regional parks. The new perimeter wall will occur
adjacent to the Talbert Marsh, but will not encroach within the marsh itself. Construction
of the south perimeter wall will require the temporarily closing the Talbert Marsh bike
path. During the temporary closure of the Talbert Marsh bike path, a bike path detour
plan will be developed and posted at the either side of the Talbert Marsh bike path. As
shown on Figure 6, the bike path detour will use the sidewalk along the Brookhurst Street
bridge crossing the intersection of Brookhurst Street and Pacific Coast Highway and
connecting to the Huntington Beach bike trail. Recreational users using the Santa Ana
River Trail will also be detoured south past the Talbert Marsh bike path under the Pacific
Coast Highway to the Huntington Beach bike path. The duration of the closure will be
determined during construction and may last two to six weeks, which may or may not be
continuous. Other shorter duration closures may also be required during construction
activities. However, the temporary bike path closure will not necessitate construction of a
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new path. Impacts to recreational uses within the area will be less than significant. No
new significant impacts will occur, and no new mitigation measures are required.
b) Include recreational facilities or require the construction or expansion of
recreational facilities which might have an adverse physical effect on the
environment?
TPAD Digester Facility and South Perimeter Wall
The TPAD Digester Facility will be constructed within the existing Plant No. 2 and will
not impact recreational facilities. The TPAD facility as modified will not alter the
conclusions in the PEIR.
The new perimeter wall will temporarily affect the bike path and after construction will
restore the two six-foot wide travel lanes. The modification to the recreational bike path
will not have an adverse physical impact on the environment. As described in the
biological resources section of this document, the construction activities will avoid
impacts to wetlands and other sensitive habitat. The plant boundary will remain similar to
existing conditions, remaining 25 feet from the edge of the Talbert Marsh. As a result, the
temporary impacts to the bike path will not adversely affect environmental resources. No
new significant impacts will occur, and no new mitigation measures are required.
Summary of Potential Effects on Recreation
The proposed modifications will not result in new significant environmental effects, or result in a
substantial increase in the severity of previously identified significant effects, with respect to
recreation. No further environmental review is required. (Public Resources Code § 21166; CEQA
Guidelines § 15162.)
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Transportation
Issues (and Supporting Information Sources):
XVII. TRANSPORTATION — Would project modifications, changed
circumstances, or new information substantially increase the severity of
significant impacts identified in the previous CEQA document or result in
new significant impacts that could:
a) Conflict with a program plan, ordinance or policy addressing the circulation
system, including transit, roadway, bicycle and pedestrian facilities?
b) Conflict or be inconsistent with CEQA Guidelines section 15064.3, subdivision
(b)?
c) Substantially increase hazards due to a geometric design feature (e.g.,
sharp curves or dangerous intersections) or incompatible uses (e.g., farm
equipment)?
d) Result in inadequate emergency access?
Discussion
Yes
No
❑
❑X
❑ ❑X
❑ ❑X
❑ ❑X
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Conflict with a program plan, ordinance or policy addressing the circulation system,
including transit, roadway, bicycle and pedestrian facilities?
TPAD Digester Facility
The PEIR concludes that the TPAD facilities would not conflict with plans or policies
addressing the circulation system. During construction access to Plant No. 2 will
primarily utilize 1-405 Freeway to Brookhurst Street and SR-55 to Victoria
Street/Hamilton Avenue and to Brookhurst Street. Construction traffic will utilize either
entrance on Brookhurst Street to access Plant No. 2. No detours or road closures are
anticipated as a result of the proposed construction activities.
The Project Modifications would not alter this conclusion. Construction truck and vehicle
trips will be generated primarily by construction workers commuting to and from the
work sites, and by trucks hauling materials and equipment to and from the pipeline
alignments.
Once constructed, the proposed Project Modifications will not increase truck and vehicle
trips within Huntington Beach and the regional circulation system The modifications will
not alter the conclusions of the PEIR. No new significant impacts will occur, and no new
mitigation measures are required.
South Perimeter Wall
The PEIR evaluated a perimeter screening project. The modifications to this project
include construction of a perimeter wall. Construction of the wall system will require
construction beyond OC San's property line. This will require the Talbert Marsh bike
path to be temporarily narrowed to 6 feet wide during construction for approximately
1,000 feet and will require temporary closures lasting approximately two to six weeks.
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During the temporary closure of the Talbert Marsh bike path, a bike path detour plan will
be developed and posted at the either side of the Talbert Marsh bike path. As shown on
Figure 6, the bike path detour will use the sidewalk along the Brookhurst Street bridge
crossing the intersection of Brookhurst Street and Pacific Coast Highway and connecting
to the Huntington Beach bike trail. Recreational users using the Santa Ana River Trail
will also be detoured south past the Talbert Marsh bike path under the Pacific Coast
Highway to the Huntington Beach bike path. East of the construction zone the path will
return to dual 6-foot-wide lanes. Construction of the perimeter wall would not require the
closure or modification of any other transportation paths in or around the project site.
Once constructed, the bike path will be returned to its current functionality. The
modifications to the perimeter screening will not alter the conclusions of the PEIR during
construction.
b) Conflict or be inconsistent with CEQA Guidelines section 15064.3, subdivision (b)?
TPAD Digester Facility
The PEIR identified that construction truck and vehicle trips will be generated primarily
by construction workers commuting to and from the work sites, and by trucks hauling
materials and equipment to and from the pipeline alignments. The PEIR estimated
construction trips in Table 2-15 at 88,990 trips per year with a VMT of 1,779,808.
Construction of the modified TPAD facility would require a concrete batch plant to
support CDSM construction methods. The construction methods will add 600 delivery
truck trips on top of those accounted for in the PEIR. Although daily truck trips will
increase, the VMT during construction will increase by 24,000 miles annually (1,200
one-way trips of 20 miles) which is less than 1.3 percent of the total annual VMT
estimated in the PEIR. Therefore, the proposed modifications will not alter the
conclusions of the PEIR with respect to VMT.
Once constructed the proposed Project Modifications will result in minimal operational
traffic compared with the assumptions in the PEIR. Further, CEQA Guidelines Section
15064.3 suggests that the analysis of VMT impacts applies mainly to land use and
transportation projects -Furthermore, projects that generate or attract fewer than 110
operational trips per day will generally be exempt from further consideration with respect
to VMT and impacts are assumed to be less than significant_ Since the Project
Modifications are neither a traffic -generating land use nor a transportation project, and
will generate very few operational trips, the project as modified will have a less -than -
significant impact with respect to VMT. This is consistent with the conclusions in the
PEIR.
South Perimeter Wall
The PEIR evaluated a perimeter screening project. The modifications to this project
include construction of a perimeter wall that will increase vehicle deliveries, resulting in
an increase of 24,000 miles annually. As described for the TPAD facility, this will
increase VMT by 24,000 miles annually which is less than 1.3 percent of the total annual
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VMT estimated in the PEIR. Therefore, the proposed modifications will not alter the
conclusions of the PEIR with respect to VMT.
Once constructed the new perimeter wall will not induce any new traffic. Operation of
the new perimeter wall will not alter the conclusions of the PEIR.
c) Substantially increase hazards due to a geometric design feature (e.g., sharp curves
or dangerous intersections) or incompatible uses (e.g., farm equipment)?
TPAD Digester Facility
As described in the PEIR, the TPAD facility will be located entirely within the treatment
plant. As a result, the TPAD facility as modified will not increase hazards due to
geometric design feature during operation or construction. The modified project will not
alter the conclusions of the PEIR. No new significant impacts will occur, and no new
mitigation measures are required.
South Perimeter Wall
The PEIR evaluated a perimeter screening project. The modifications to this project
include construction of a perimeter wall that will modify the bike path slightly. As
previously mentioned, construction of the perimeter wall will temporarily alter the bike
path that is adjacent to the southern region of the plant. During construction the bike path
may be temporarily closed. A detour route will be provided as shown in Figure 6.
Once constructed, the bike path will be restored to its pre -construction conditions once
construction is complete. Operation for the perimeter wall will not alter the physical
configuration of an existing roadway network serving the project area, and will not
introduce unsafe design features. The modification to the perimeter screening will not
alter the conclusions of the PEIR during construction or operation.
d) Result in inadequate emergency access?
TPAD Digester Facility
The PEIR describes in Section 3.11.3 (p.3.11-13) that construction trucks and employee
vehicles will interact with other vehicles on project area roadways, including emergency
vehicles, but will not alter the physical configuration of the existing roadway network
serving the area in a manner that could affect emergency access. Operation and
construction of the TPAD facility as modified will not substantially increase daily traffic
or affect roadways or lanes that could impede emergency access. As a result, the Project
Modifications would not alter the conclusions of the PEIR. No new significant impacts
will occur, and no new mitigation measures are required.
South Perimeter Wall
The PEIR evaluated a perimeter screening project. The modifications to this project
include construction of a perimeter wall. Construction of the wall system will require
construction beyond OC San's property line, but will not encroach on existing roadway
networks serving the area or alter the physical configuration of the existing roadway
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network serving the area in a manner that could affect emergency access. The
modifications to the existing perimeter screening will not alter the conclusions of the
PEIR during construction or operation.
Summary of Potential Effects on Transportation
The proposed modifications will not result in new significant environmental effects, or result in a
substantial increase in the severity of previously identified significant effects, with respect to
transportation. No further environmental review is required. (Public Resources Code § 21166;
CEQA Guidelines § 15162.)
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Tribal Cultural Resources
Issues (and Supporting Information Sources):
XVIII. TRIBAL CULTURAL RESOURCES — Would project modifications,
changed circumstances, or new information substantially increase the
severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Cause a substantial adverse change in the significance of a tribal cultural
resource, defined in Public Resources Code section 21074 as either a site,
feature, place, cultural landscape that is geographically defined in terms of
the size and scope of the landscape, sacred place, or object with cultural
value to a California Native American tribe, and that is:
i) Listed or eligible for listing in the California Register of Historical
Resources, or in a local register of historical resources as defined in
Public Resources. Code Section 5020.1(k), or
Yes No
FE
ii) A resource determined by the lead agency, in its discretion and ❑
supported by substantial evidence, to be significant pursuant to criteria
set forth in subdivision (c) of Public Resources Code Section 5024.1. In
applying the criteria set forth in subdivision (c) of Public Resources Code
Section 5024.1, the lead agency shall consider the significance of the
resource to a California Native American tribe.
Discussion
❑X
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a.i) Listed or eligible for listing in the California Register of Historical Resources, or in
a local register of historical resources as defined in Public Resources. Code
Section 5020.1(k)
TPAD Digester Facility and South Perimeter Wall
The PEIR concluded that no known historic resources have been identified within the
treatment plant or construction area. The proposed Project Modifications will be
implemented within Plant No. 2 in the same location evaluated in the PEIR. Therefore,
no new significant impacts will occur, and no new mitigation measures are required.
a.ii) A resource determined by the lead agency, in its discretion and supported by
substantial evidence, to be significant pursuant to criteria set forth in subdivision (c)
of Public Resources Code Section 5024.1. In applying the criteria set forth in
subdivision (c) of Public Resources Code Section 5024.1, the lead agency shall
consider the significance of the resource to a California Native American tribe.
TPAD Digester Facility and South Perimeter Wall
The PEIR concluded that there are currently no known resources that will be considered
significant pursuant to subdivision (c) of Public Resources Code Section 5024.1 within the
project area. The proposed Project Modifications will be implemented within Plant No. 2
and along the southern edge of the property, consistent with the area evaluated in the PEIR.
Although the construction would encroach onto the bike path beyond the plant boundary,
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the affected area is within the area of potential effect (APE) evaluated in the PEIR. No new
significant impacts will occur, and no new mitigation measures are required.
Summary of Potential Effects on Tribal Cultural Resources
The proposed modifications will not result in new significant environmental effects, or result in a
substantial increase in the severity of previously identified significant effects, with respect to
tribal resources. No further environmental review is required. (Public Resources Code § 21166;
CEQA Guidelines § 15162.)
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Utilities and Service Systems
Issues (and Supporting Information Sources):
XIX. UTILITIES AND SERVICE SYSTEMS —Would project modifications,
changed circumstances, or new information substantially increase the
severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Require or result in the relocation or construction of new or expanded
water, wastewater treatment or storm water drainage, electric power,
natural gas, or telecommunications facilities, the construction or relocation
of which could cause significant environmental effects?
b) Have insufficient water supplies available to serve the project and
reasonably foreseeable future development during normal, dry and
multiple dry years?
c) Result in a determination by the wastewater treatment provider which
serves or may serve the project that it has inadequate capacity to serve
the project's projected demand in addition to the provider's existing
commitments?
d) Generate solid waste in excess of State or local standards, or in excess of
the capacity of local infrastructure, or otherwise impair the attainment of
solid waste reduction goals?
e) Fail to comply with federal, state, and local management and reduction
statutes and regulations related to solid waste?
Discussion
Yes
No
❑
N
❑ N
❑ N
❑ N
❑ N
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Require or result in the relocation or construction of new or expanded water,
wastewater treatment or storm water drainage, electric power, natural gas, or
telecommunications facilities, the construction or relocation of which could cause
significant environmental effects?
TPAD Digester Facility and South Perimeter Wall
The PEIR concluded that the proposed project will upgrade an existing wastewater
treatment plant. The project will not require additional water, wastewater, natural gas, or
telecommunication facilities. As discussed in Chapter 2, Project Description, and in
Section 3.6, Greenhouse Gas Emissions, of the PEIR, once constructed, the project will
increase the energy efficiency of the facilities and will not result in an increase in
electricity or natural gas usage. The Project Modifications include new equipment and
structures, but will not alter the conclusions in the PEIR. No new significant impacts will
occur, and no new mitigation measures are required.
b) Have sufficient water supplies available to serve the project and reasonably
foreseeable future development during normal, dry and multiple dry years?
TPAD Digester Facility and South Perimeter Wall
The PEIR concluded that the project will not increase water demands. The Project
Modifications would not introduce any addition facilities that would require a new water
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source beyond what was analyzed in the PEIR. The proposed Project Modifications
would not add any new water demands. No new significant impacts will occur, and no
new mitigation measures are required.
c) Result in a determination by the wastewater treatment provider which serves or
may serve the project that it has adequate capacity to serve the project's projected
demand in addition to the provider's existing commitments?
TPAD Digester Facility and South Perimeter Wall
The PEIR concluded that TPAD facility will not exceed wastewater treatment provider
capacity. The Project Modifications would not introduce any addition facilities that
would contribute to wastewater demands beyond what was analyzed in the PEIR. The
proposed Project Modification would not increase wastewater demands. Therefore, there
will be no new significant impacts and no new mitigation measures are required. This
finding is consistent with the impact determination in the PEIR; no new significant
impacts will occur, and no new mitigation measures are required.
d) Generate solid waste in excess of State or local standards, or in excess of the
capacity of local infrastructure, or otherwise impair the attainment of solid waste
reduction goals?
TPAD Digester Facility
The PEIR notes on page 2-26 that and the TPAD facility will require 121,000 cubic yards
that will be exported and 8,000 cubic yards that will be imported. The PEIR notes on p.
3.13-6 that the project will be subject to the Integrated Waste Management Act of 1989
(Public Resources Code [PRC] 40050 et seq. or Assembly Bill [AB] 939), administered
by CalRecycle that requires all local and county governments to reduce the amount of
solid waste sent to landfills. As modified, the TPAD facility will require less off -site
hauling (approximately 97,200 cubic yards) Therefore, construction of the proposed
project will not increase the generation of solid waste beyond what was analyzed in the
PEIR.
Once constructed, the new TPAD facility will produce biosolids as described in the
PEIR. The modifications will not alter the conclusions in the PEIR; no new significant
impacts will occur, and no new mitigation measures are required.
South Perimeter Wall
The perimeter wall will not require hauling soils offsite. Therefore, construction of the
proposed project will not increase the generation of solid waste beyond what was
analyzed in the PEIR.
Once constructed, the new perimeter wall will not generate solid waste. The
modifications will not alter the conclusions in the PEIR; no new significant impacts will
occur, and no new mitigation measures are required.
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e) Comply with federal, state, and local management and reduction statutes and
regulations related to solid waste?
TPAD Digester Facility
The PEIR notes on p. 3.13-6 that the project will be subject to the Integrated Waste
Management Act of 1989 (Public Resources Code [PRC] 40050 et seq. or Assembly Bill
[AB] 939), administered by CalRecycle that requires all local and county governments to
reduce the amount of solid waste sent to landfills. As modified, the TPAD facility will
require less off -site hauling. Therefore, construction of the proposed project will not
increase the generation of solid waste beyond what was analyzed in the PEIR.
Once constructed, the new TPAD facility will produce biosolids as described in the
PEIR. The modifications will not alter the conclusions in the PEIR; no new significant
impacts will occur, and no new mitigation measures are required.
South Perimeter Wall
The perimeter wall will not require hauling soils offsite. Therefore, construction of the
proposed project will not increase the generation of solid waste beyond what was
analyzed in the PEIR.
Once constructed, the new perimeter wall will not generate solid waste. The
modifications will not alter the conclusions in the PEIR; no new significant impacts will
occur, and no new mitigation measures are required.
Summary of Potential Effects on Utilities and Service Systems
The proposed modifications will not result in new significant environmental effects, or result in a
substantial increase in the severity of previously identified significant effects, with respect to
utilities and service systems. No further environmental review is required. (Public Resources
Code § 21166; CEQA Guidelines § 15162.)
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Wildfire
Issues (and Supporting Information Sources): Yes No
XX. WILDFIRE — Would project modifications, changed circumstances, or new
information substantially increase the severity of significant impacts
identified in the previous CEQA document or result in new significant
impacts that could:
a) Substantially impair an adopted emergency response plan or emergency
evacuation plan?
b) Due to slope, prevailing winds, and other factors, exacerbate wildfire risks, 0
and thereby expose project occupants to, pollutant concentrations from a
wildfire or the uncontrolled spread of a wildfire?
c) Require the installation or maintenance of associated infrastructure (such El 0
as roads, fuel breaks, emergency water sources, power lines or other
utilities) that may exacerbate fire risk or that may result in temporary or
ongoing impacts to the environment?
d) Expose people or structures to significant risks, including downslope or
downstream flooding or landslides, as a result of runoff, post -fire slope
instability, or drainage changes?
Discussion
Would project modifications, changed circumstances, or new information substantially
increase the severity of significant impacts identified in the previous CEQA document or
result in new significant impacts that could:
a) Substantially impair an adopted emergency response plan or emergency evacuation
plan?
TPAD Digester Facility and South Perimeter Wall
The PEIR described that the treatment plant is located in an urbanized area that is not
located within or near an area designated as a State Responsibility Area or an area
classified as a Very High Fire Hazard Severity Zone according to the California
Department of Forestry and Fire Protection (CAL Fire 2022). The proposed Project
Modifications will not change the location of the TPAD facility or perimeter wall.
Therefore, there will be no new significant impacts will occur, and no new mitigation
measures are required.
b) Due to slope, prevailing winds, and other factors, exacerbate wildfire risks, and
thereby expose project occupants to, pollutant concentrations from a wildfire or the
uncontrolled spread of a wildfire?
TPAD Digester Facility and South Perimeter Wall
The PEIR described that the treatment plant is located in an urbanized area that is not
located within or near an area designated as a State Responsibility Area or an area
classified as a Very High Fire Hazard Severity Zone according to the California
Department of Forestry and Fire Protection (CAL Fire 2022). The proposed Project
Modifications will not change the location of the TPAD facility or plant boundary, or
exacerbate risks or wildfire. Therefore, there will be no new significant impacts will
occur, and no new mitigation measures are required.
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c) Require the installation or maintenance of associated infrastructure (such as roads,
fuel breaks, emergency water sources, power lines or other utilities) that may
exacerbate fire risk or that may result in temporary or ongoing impacts to the
environment?
TPAD Digester Facility and South Perimeter Wall
The PEIR described that the treatment plant is located in an urbanized area that is not
located within or near an area designated as a State Responsibility Area or an area
classified as a Very High Fire Hazard Severity Zone according to the California
Department of Forestry and Fire Protection (CAL Fire 2022). The proposed Project
Modifications will not change the location of the TPAD facility or perimeter boundary, or
require installation of infrastructure that may exacerbate wildfire. Therefore, there will be
no new significant impacts will occur, and no new mitigation measures are required.
d) Expose people or structures to significant risks, including downslope or downstream
flooding or landslides, as a result of runoff, post -fire slope instability, or drainage
changes
TPAD Digester Facility and South Perimeter Wall
The PEIR described that the treatment plant is located in an urbanized area that is not
located within or near an area designated as a State Responsibility Area or an area
classified as a Very High Fire Hazard Severity Zone according to the California
Department of Forestry and Fire Protection (CAL Fire 2022). The proposed Project
Modifications will not change the location of the TPAD facility or perimeter boundary, or
require installation of infrastructure that may exacerbate wildfire or be located downslope
or downstream of slopes that could result in flooding or landslides as a result of post -fire
runoff. Therefore, there will be no new significant impacts will occur, and no new
mitigation measures are required.
Summary of Potential Effects on Wildfire
The proposed modifications will not result in new significant environmental effects, or result in a
substantial increase in the severity of previously identified significant effects, with respect to
wildfire. No further environmental review is required. (Public Resources Code § 21166; CEQA
Guidelines § 15162.)
References
California Department of Forestry and Fire Protection (CAL FIRE). 2022. Fire Hazard Severity
Zone Viewer. Available at: https:Hegis.fire.ca.gov/FHSZ/. Accessed July 20, 2022.
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Mandatory Findings of Significance
Issues (and Supporting Information Sources): Yes No
XXI. MANDATORY FINDINGS OF SIGNIFICANCE —
a) Does the Project Modification have the potential to substantially degrade ❑ ❑X
the quality of the environment, substantially reduce the habitat of a fish
or wildlife species, cause a fish or wildlife population to drop below self-
sustaining levels, threaten to eliminate a plant or animal community,
substantially reduce the number or restrict the range of a rare or
endangered plant or animal or eliminate important examples of the major
periods of California history or prehistory?
b) Does the Project Modification have impacts that are individually limited, ❑
but cumulatively considerable? ("Cumulatively considerable" means that
the incremental effects of a project are considerable when viewed in
connection with the effects of past projects, the effects of other current
projects, and the effects of probable future projects)?
c) Does the Project Modification have environmental effects which will ❑
cause substantial adverse effects on human beings, either directly or
indirectly?
Discussion
a) Does the project have the potential to substantially degrade the quality of the
environment, substantially reduce the habitat of a fish or wildlife species, cause a
fish or wildlife population to drop below self-sustaining levels, threaten to eliminate
a plant or animal community, substantially reduce the number or restrict the range
of a rare or endangered plant or animal or eliminate important examples of the
major periods of California history or prehistory?
TPAD Digester Facility and South Perimeter Wall
The PEIR concluded that the BMP Master Plan would not have the potential to
substantially degrade the quality of the environment, substantially reduce the habitat of a
fish or wildlife species, cause a fish or wildlife population to drop below self-sustaining
levels, threaten to eliminate a plant or animal community, substantially reduce the
number or restrict the range of a rare or endangered plant or animal or eliminate
important examples of the major periods of California history or prehistory. The Project
Modifications would occur within the same approximate footprint as the project
evaluated in the PEIR and would not encroach onto areas that could support ecological or
historical resources not already described in the PEIR. As a result, the Project
Modifications would not alter the conclusions of the PEIR.
b) Does the project have impacts that are individually limited, but cumulatively
considerable?
TPAD Digester Facility and South Perimeter Wall
The PEIR identified the BMP Master Plans contribution to cumulative impacts for all
resource topics and concluded that cumulative impacts would be less than significant.
The Project Modifications refine the TPAD facility and perimeter screening designs, but
would not increase impacts substantially (as described in this Addendum) that could
result in cumulatively considerable contributions significant impacts.
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c) Does the project have environmental effects which will cause substantial adverse
effects on human beings, either directly or indirectly?
TPAD Digester Facility and South Perimeter Wall
The PEIR concluded that the BMP Master Plan would not result in impacts that could
cause substantial adverse effects on human beings, either directly or indirectly. The
Project Modifications refine the TPAD facility and perimeter screening designs, but
would not increase impacts substantially (as described in this Addendum) that could
adversely affect human beings not already described in the PEIR.
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Summary
As described in this Addendum, impacts to the environment as a result of the Project
Modifications will not result in new significant environmental effects or a substantial increase in
the severity of previously identified significant effects. No new information of substantial
importance indicates the project as modified will have one or more significant effects not
discussed in the previous PEIR, nor are significant effects previously examined substantially
more severe than described in the previous PEIR. No new mitigation will be required as a result
of implementing the Project Modifications. Pursuant to CEQA Guidelines Sections 15168(c)(2),
15162 and 15164 a, the proposed modifications are within the scope of the Program EIR and do
not require preparation of a Subsequent or Supplemental EIR.
Addendum to the Final Program Environmental Impact Report 107 ESA / D201500626.02
for Biosolids Master Plan for Project No. P2-128 December 2022