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HomeMy WebLinkAboutITEM 18 - 2018-09-05 J-117B Ops - PDSA Contingency Increase Iwo 46 Am/of iA Ocean Outfall System Rehabilitation, Project No. J -117 PDSA Contingency Increase 1 r ,' rr► 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 .,- , REPLACE . ,llltllllllil - CEN GEN ELECTRICAL < y - '■.. .. jrt % \•`; ` �. � , •' ' ;ice ' � •� f REPLACE EXISTING PLANT WATER _ a PUMP STATION r Lit m RECLAIMABLE FLOWS _ y NON-RECLAIMABLE FLOWS �} r � �1 1 1 I � ern-rye ■ ( f Electrical Work Across Plant No . 2 iL JIM., . M r .•". , ►� -v 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%) 4 ti 9n ,2 `y IhF tMv` _ 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%) .