HomeMy WebLinkAboutItem 15 PPP Operations 09-06-17 - Ocean Outfall System Rehab Project No. J-117 Iwo 46
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Ocean Outfall System Rehabilitatio
Project No . J - 117
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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 ($76 mil )
• Rehabilitation Ocean Outfall Booster Pump Station
• New Outfall Low Flow Pump Station
• Replace Plant Water PS for GWRS Final Expansion Added
• Power Distribution Switchgear Upgrades Nov2016
J-1176 is on critical path for
GWRS Final Expansion startup
Outfall Low Flow Pump Station , Contract No . J - 117B
GWRS PS
PLANT WATER PS
C-D� LOW FLOW PS
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Active au s Identified
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Implications of Active Faults
• An occupied structure may not be built on an active
fault
• Pump stations not considered occupied
• Non-occupied structures allowed on faults, but more
evaluation and design effort required
• Approach is to avoid faults whenever practical
P2-98: Location of New A-Side Clarifiers
Changed to Avoid Fault
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HEADWORKS ��IAfflE _ ~� � ��
ODOR INIJ DIST X 8"DB
CONTTO ( ) , Treatment
FACILTY
(2)5'(THROUGH TUNNEL)
24"FA(E) 4 Rehabilitation
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\j CE�NWTERR CLARIFIER D CLARIFIER E 36"PI
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PRIMARY
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BLEACH _;r- I PRIMARY PRIMARY (10)3e1 a r i i e r Location
FACILITY CLARIFIER CLARIFIER
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No practical alternative for
Low Flow Pump Station
• Additional engineering required
• Additional investigation to locate faults
• Evaluation of siting alternatives
• Soil modeling
• Soil/Structure modeling
• Structural redesign
• Other design challenges
• Physical modeling
• Difficulties drilling test wells for dewatering
• P2-107 Power Monitoring & Control Upgrades Coordination
CEQA Documentation
• Initial Study determined that all potentially
significant environmental impacts can be mitigated
• 30-day public review period closed on July 6
• Mitigated Negative Declaration has been completed
in compliance with the requirements of CEQA
Recommendations
• Consider, receive, and file the Initial Study/Mitigated Negative Declaration
and Mitigation Monitoring and Reporting Program for the Ocean Outfall
System Rehabilitation, Project No. J-117, and Outfall Low Flow Pump
Station, Contract No. J-11713, prepared by Brown and Caldwell and
Environmental Science Associates;
• Adopt Resolution No. OCSD 17-XX, making certain findings and adopting
the Mitigated Negative Declaration and Mitigation Monitoring and
Reporting Program pursuant to the California Environmental Quality Act;
and
• 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
$3,727,907 (55%).