HomeMy WebLinkAboutItem 7 PPP 01-16-19 Operations Comm Meeting - P1-105 J
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Headworks Facilities Are Aging
IT ,, :;, ` 16 years
23 years
28 years
43 years
57 years
Rehabilitation of Existing Facilities
TIC"
• M & D Structure
Bar Screens
• Bin Loading
�►�
�,. r>> • Main Sewage PS
- � � • Grit Basins
' I
Demolition of Unused Facilities
'6 vow
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Headworks 1
ter:cz , i►) ��� ` �<< • Chlorine
_..-- ? . 0 Building
`G • Grit Handling
y
Upgrades and Replacements
• Replacement
I-N` 1' 10 - - pumping capacity
Bin Loading
Modifications
A
i Grit Pumping
• �f ";, �.� . � (new)
�' ' . • Grit Handling
r ., Building
(replacement)
" • Odor Control
(upgrades)
y Power Building 3B
(new)
KeyChallenge ,MMMetering & Diversion Box Rehab
t� ,��Q �sar,+oolv.a000
f�.ds
i i i.l n.. IB'Ludid Newlupe pimii nd UM IB LFsInn No.l
SU 5-OM NHPOO t 5 l)000 i`
-- £t/A0005
NHP"5- -RCP
SAR"5 32N O-0lk,_
,�SAwOO r • Needed repairs in box
sAN000s a �® ,*) Ndol5-�WW
requires taking each major
_ sewer line out of service
Requires complex bypass
pumping
• Talbert Trunk requires lining
• Risk of upstream impacts
during construction
KeyChallenge
ReplacingInfluent Meter Runs
2A
Only access to replace spools is
. «t
through an opening above a pipe. ,�1
New monorail needed for
2B
construction 2E �i, �•�
.00'
2C
•� Walkway must
4 be removed
Severe corrosion
at top of pipes and replaced
to replace pipe
sections below
KeyChallenge
Gate Re I a ce m e nts
p /�� EXIST ME�'EFIRO AND DWEPSIO.I�j
/ (Mt 0 STRUL`GURE
is 110 gates is Major shutdowns L. `
required INL T
� SUNFLOWER CMaNNEL
�f� '� r
$TAT ION
1 2 3 4
• Confined space
p � I
entry requires 1,OAR SCREEN
IMP ROOM.
advance --
10
preparation for
construction ° l
p •
roblems � �°° L,R
GI
s t
is April 2018: $2. 1 5 6 7 8 9 10 T
million Consultant TUNNE
contingency for - GRIT c11AM
g Y TUNNEL�.
G1O
gate inspection
and minor repair - -
'- ITT R %
work
i il;l I
KeyChallenge
Replacing 40 an d Pumping Capacityif � -M
CFD modeling shows flow separation I' '• 1',
through existing pump intakes at80
mgd.When evaluating alternatives,
Carol le will use the CFD model to 0
evaluate improvements thatcuuld
resolvethls issue. '
Increase capacity of existing pumps Add 2 new pumps to existing PS
p Y g p p Modifying (difficult construction)
(potential hydraulic problems) existing inlet
provides best ""
Build new, separate HAR value and reduce 'i
s,
pump station t ------ ..
(complex to operate, _ project risk ^� J
difficult to maintain) RIF
• MSP Intake . :_
Replacement for
• ��J�Q� ,��� ,, �P Hydraulic
ti rQ A n _ Influence
mod ._
Submerslble Pumps 13 a 70 mgi
�ti Compliance
Key
Challenge
Replacing Odor Control System
• Existing system performs adequately
• No redundant scrubbers
handling• Additional capacity needed for grit
• Must remain in service during
• •
• Remaining useful life 10 years
V' I Diameter Scrubbers7
for 122,000 ctm
Space tor •g. iNRW �
'.� tunControl
the C
KeyChallenge
mmim
Electrical Distribution
• Headworks is a major electrical _
,
load
• Critical for water in/out -••, ,___- z -
• Upsized pumps require medium =H� • v ___
voltage supply A = _
_k
• Two standby generators need
replacement
• Separation of electrical 480-volt Motor Control
Center MSPs
equipment to avoid single point =
of failure
Sl` Antlers"n
ft St�h"n W,�s:eh�uie�
480-volt Switchgear
m
e
3b
qq B � °Gcq
7
F¢8
y
e4-$�yr S1s° DYds GF> 0
Y
s"�ih N
T—V6
Power
BuilEing]A
P"we
— BuIlmnq]
e
Power Building 3A
New
sGBIa Pow
weab P..
° er
"q Existing
Project Timeline
Preliminary Design
Completion/Project Design
Validation Submittal 1
Preliminary Final Design 40 Design
Design Start Start Submittal 2
2016 2018
0.4 0.4 1 f 7
Evaluation Phase Preliminary Design Phase Final Design Phase
Project
Validation
Design Submittal 2
Required Budget: $425 million
onstruction Cost : $295 million
Project Budget
Current Authorization
Project Budget: $370 millionStaff is workingthrough design options '
Construction Cost: $255 million � will return with recommendedchangesto
- . the totalbudget
million
Reduced Scope
Project Budget: $370 million
Construction Cost: $255 million
Pl- 105 Value EngineeringOpportunities
Construction14 P1-105
.
• • • • • 'md •
1 Defer grit handling ($14million)
2 Defer odor control ($23 million)
3 Replace two additional generators +$5 million
4 Electrical Feed from CenGen instead of Service Center ($2 million)
5 Additional value engineering opportunities ($5 million)
Total ($39 million)
Reduction
Opportunity 1- Defer Grit Handl
ing
• Potential Savings
$14 million .4ir
Design i n
:
:ky
• Savings: No further
design required _
• Additions:
Rehabilitation design
from scratch
• Lose benefit of better
grit capture and less _
odorous grit _ --
w �w
• Facility can be built in
future '
Opportunity 2 : Defer odor control
• Potential Savings
$23 million40
- - �`
• Design Impact:
• • _ i--
y _ J
• Savings: No [ p
further design
required � = -
/if 9
• Interim maintenance
and repairs required ` Q
• Facility can be built in
future
OF
1
<,.
Opportunity 3 - Install two additional generators
• Potential Cost $5 million �!
• Replaces three end-of-life =-
generators for secondary
treatment and solids processes .
• Installed in Standby Generator
Building built with this project
• .0090
• Centralization of generators,
commonality of equipment
• Design Impact:
• New design effort
• These generators could be ..�
installed after P1-105
completion
Opportunity4- Electrical Feed from CenGen instead of Service Center
r
• Potential Savings
$2 million
• Design Impact:
• Minimal
• Single point of failure at
CenGen until replacement
of CenGen switch in .j
gear
2022. PB3A
e: PB3
Li
7O N"12-kV Duct Bank
Next Steps
• Work with Consultant to
19
balance: '
rr
• requirements
uirementsr-
�
I
• Construction costs "` Y
• Design impacts
• Construction duration i! -RI Y
• Negotiate design changes
before proceeding
• Bring recommendations to the
Operations Committee and _ =
Board of Directors on final
design scope and appropriate F
budget adjustments �,
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