Loading...
HomeMy WebLinkAbout05.b. Receive update on the Filter Plant and Clearwell Projects Page 1 of 8 Item 5.b. I Central Contra Costa Sanitary District January 17, 2018 TO: ENGINEERING AND OPERATIONS COMMITTEE FROM: EDGAR J. LOPEZ, CAPITAL PROJECTS DIVISION MANAGER REVIEWED BY: JEAN-MARC PETIT, DIRECTOR OF ENGINEERING AND TECHNICAL SERVICES SUBJECT: RECEIVE AN UPDATE ON THE FILTER PLANT AND CLEARWELL PROJECTS An update regarding the Filter Plant Improvements, District Project 7361, the proposed Fiscal Year 2018- 19 Clearwell project, and near term repair of the Clearwell cover will be discussed at the meeting. ATTACHMENTS: 1. Clearwell Cover January 17, 2018 Special EOPS Committee Meeting Agenda Packet- Page 14 of 29 Page 2 of 8 Item 5.b. (Committee Handout) CLEARWELL COVER Engineering & Operations Committee January 17, 2018 Meeting Presented by Edgar J. Lopez, PE Capital Projects Division Manager and Jean-Marc Petit Director of Engineering and Technical Services ISSUES-BACKGROUND Clearwell stores recycled water (ReW) Only East Cell has been used to store ReW East Cell has a membrane cover West Cell has never been used, no cover Filter Project currently identified in the CIB Clearwell cover replacement identified in CWMP — Included in CIP in four years Last year heavy rain and drain failure accelerated deterioration of cover 1 1 January 17, 2018 Special EOPS Committee Meeting Agenda Packet- Page 15 of 29 Page 3 of 8 EXISTING REW FACILITIES Clearwell Filter Plant CLEARWELL COVER PICTURE JUNE 2014 West Cell without cover East Cell with cover j 2 January 17, 2018 Special EOPS Committee Meeting Agenda Packet- Page 16 of 29 Page 4 of 8 PREMATURE TEAR AROUND PERIMETER 1^ 1 COVER INSPECTION .JANUARY 2018 1 January 17, 2018 Special EOPS Committee Meeting Agenda Packet- Page 17 of 29 Page 5 of 8 COVER CONDITION AFTER INSTALLATION OF INNER TUBES f` F 4 January 17, 2018 Special EOPS Committee Meeting Agenda Packet- Page 18 of 29 Page 6 of 8 PRELIMINARY FINDINGS Cover needs to be replaced Cover replacement to be included in Filter Plant Rehabilitation project Need to provide temporary fix on cover Need to commission the West Cell to make repairs to east side Working on minimizing risk in meeting Title 22 and supplying ReW to plant and Zone 1 Estimated project cost this Fiscal Year $900k 1 FINDINGS FROM COVER INSPECTION Membrane Cover: • Cover remains in poor shape • About fourteen inner tubes .� are inflated to hold the cover Drain Valve: • This valve appears to be holding and the Clearwell -___ _-•-- « sump at Basin Cover Drain Valve • The new PVC drain assembly appears to be functioning I January 17, 2018 Special EOPS Committee Meeting Agenda Packet- Page 19 of 29 Page 7 of 8 NEXT IMMEDIATE STEPS Issuing RFPs/Bids: Clearwell dewatering/cleaning for west cell Possible purchase of floating balls for temporary west cell cover Consultant selection for Filter Plant and Clearwell Improvements Design USE OF FLOATING BALLS FOR TEMPORARY COVER Plar � L Floating Ball act as a floating covers and can be used to: Reduce evaporation from a reservoir -Shade water from sunlight to prevent algae growth Cover water.which deters waterfowl from entering the reservoir and nesting in the water or other fluid _=... Reduce water treatment chemical use ' E: January 17, 2018 Special EOPS Committee Meeting Agenda Packet- Page 20 of 29 Page 8 of 8 QUESTIONS? 7 January 17, 2018 Special EOPS Committee Meeting Agenda Packet- Page 21 of 29