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| Subject |
| Adopt plans and specifications for the construction of the Extraction Well Pipelines. (No general fund impact) (Echiburu/Kieffer) |
| Recommended Action |
- Authorize the Director, Division of Integrated Waste Management, to finalize and adopt the plans and specifications for the Construction of the Extraction Well Pipelines;
- Authorize the Director, Division of Integrated Waste Management, to sign the Notice to Contractors;
- Authorize the Division of Integrated Waste Management to advertise for competitive bids;
- Authorize the Director, Division of Integrated Waste Management, to execute a construction contract with the lowest responsive and responsible bidder, provided the contract amount does not exceed available funds, or to reject all bids; and
- Authorize the Director, Division of Integrated Waste Management to approve all change orders up to the maximum amount allowable under State law, provided the total contract amount does not exceed the available funds for this project.
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| Strategic Plan Goal(s) |
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Sustainable Environment |
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| Reason for Recommended Action/Background |
The County maintains and operates an on-site groundwater extraction system under Waste Discharge Requirement No. R5-2002-0078 issued by the California Regional Water Quality Control Board (CRWQCB) on May 3, 2002. The purpose of the system is to depress the water table sufficiently to provide the required vertical separation between the base of the waste in the Waste Management Units and the groundwater.
Unfortunately, this system, which has been in-place since 1993, has not been sufficient to control groundwater levels under several of the older units of the landfill during high rainfall years. In 2018, the CRWQCB issued a Notice of Violation (NOV) for failure to control groundwater separation under portions of Waste Management Units 1-3 at the landfill. In response to this NOV, the division completed several studies and has installed 11 additional groundwater extraction wells along the western edge of the landfill. In the last several years, groundwater separation has been maintained at the landfill, though this has also been aided by the extreme drought conditions.
With the installation of the additional 11 extraction wells, conveyance piping must now be installed to connect these wells to the landfill’s retention pond and/or the groundwater treatment system (should contaminants be detected).
The plans and specifications were prepared by Geo-Logic Associates under an agreement approved by the Board on December 15, 2020. This project is included as part of the Capital Improvement Plan approved by the Board on June 2, 2020. |
| Collaborations (including Board advisory groups and external partner agencies) |
| County Counsel has approved the agreement as to form. |
| Competitive Bid Process |
| Project will be advertised on Bidsync.com for competitive bidding. The competitive bid process will be completed in accordance with State law. Bids will be opened and read publicly at the Department of Community Services-Division of Integrated Waste Management. A contract may only be awarded to the lowest responsive and responsible bidder. |
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| Fiscal Impact |
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| Source of Funds for this Expenditure |
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Explanation (Expenditure and/or Revenue) |
| Further explanation as needed: |
Construction of the Extraction Well Pipelines will be paid by the Sanitation Enterprise Fund, which is funded through the tipping fees collected at the landfill. There will not be an impact to the General Fund. The engineer's estimate including contingency for the Construction of the Extraction Well Pipeline is $550,000. Sufficient funds have been budgeted in the FY 21-22 division budget for this work.
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