HomeMy WebLinkAboutITEM 18 - 2018-09-05 J-117B Ops - PDSA Contingency Increase Iwo 46
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Ocean Outfall System Rehabilitation, Project No. J -117
PDSA Contingency Increase
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Ocean Outfall System Rehabilitation
Project No . J =117
1. J-117A Interplant Effluent Pipeline Rehabilitation
• Construction Contract Awarded June 2017 ($12.6 mil)
2 . J-117B Outfall Low Flow Pump Station ($91 mil)
• Ocean Outfall Booster Pump Station Rehab
• New Outfall Low Flow Pump Station
• Replace Plant Water PS for GWRS Final Expansion Added
• Power Distribution Switchgear Upgrades Nov2016
• SCADA System and Network Upgrades (P2-107) Added
Mar 2018
Ocean Outfall System Rehabilitation, Project No. J -117
2.2 PLANT WATER PS
LOW FLOW PS9CE us • •
AN014FQIL
OCEAN OUTFALL �.: __ PIPELINE
BOOSTER STATION
(OOBS) REHAB
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- CEN GEN
ELECTRICAL < y
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f REPLACE EXISTING
PLANT WATER _ a
PUMP STATION
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Electrical Work Across Plant No . 2
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Load S
WEATHERDR17W'EATHER WET
TOTAL LOAD 7 MW 10-13 MW
CEN GEN CAPACITY 4-6 MW g MW LOAD SHEDDING METHODS:
CEN GEN OVERLOADED ON ' CONTINGENCY BASED (EVENT DRIVEN)
POWER IMPORTED 1-3 MW 1-4 MW UTILITY POWER OUTAGE ' BACKUP FREQUENCY
PARTIAL TRIPPING Standby Standby LOADS WITH
OF DOWNSTREAM STANDBY POWER
LOADS (TYPICAL) Generators ��� Generators
Ocean Outfall (TYPICAL)
Pump Station Headworks
Effluent
Pump Station Primary
Annex
Clarifiers
PLANT PRIMARY
POWER SOURCES
City Water OOOOOO Activated
Pump Station Sludge
Utility Central Generators
Standby it (5) 3 MW, (1) 1 MW
Generators
Centrifuges Trickling
Filters
Gas Compressors
NON-CRITICAL /Primary Effluent Digesters Standby
LOAD Pump Station
Generators
Status of C
Authorized Total
Description . . . .
Feb 2015 Contract Award $677,801 $677,801 (10%)
Nov 2016 Add Plant Water PS, $2,372,305 $31050,106 (45%)
CenGen Switchgear
Sep 2017 Fault Displacement Mitigation $677,801 $3,727,907 (55%)
Sep 2018 Additional Design Requirements $677,801 $4,405,708 (65%)
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Additional work
• Integration of SCADA System and Network Upgrades,
Project No. P2-107
• Temporary power feed to keep large Outfall Pumps
available during wet season
• Integration of all CenGen equipment with existing
controls
• Increased effort for bid support and conformed
documents — Drawings increased from ^'800 to
�1100 drawings.
Recommendations
• Approve a contingency increase of $677,801 ( 10%) to
the Professional Design Services Agreement with
Brown and Caldwell for Ocean Outfall System
Rehabilitation, Project No. J-117, for a total
contingency of $4,405,708 (65%) .