Consent-Community Services # 39.
Board of Supervisors
- Meeting Date:
- 06/28/2022
- Brief Title
- Accept groundwater extraction pipeline project at the landfill as complete
From:
Taro Echiburu, Director, Department of Community Services
Staff Contact:
Brian de la Cruz-Ta, Assistant Engineer, Department of Community Services, x8728
Supervisorial District Impact:
Subject
Accept as complete the Construction of the Extraction Well Pipeline Contract (Yolo County Agreement No. 4205) at the Yolo County Central Landfill constructed by C.E.Cox Engineering, Inc., and authorize the Director of Integrated Waste Management to sign and record the Notice of Completion and pay the final estimate releasing retention. (No general fund impact) (Echiburu/de la Cruz-Ta)
Recommended Action
- Accept as complete the work on the Construction of the Extraction Well Pipeline Contract at the Yolo County Central Landfill constructed by C.E.Cox Engineering, Inc.; and
- Authorize the Director, Division of Integrated Waste Management to sign and record the Notice of Completion and pay the final estimate releasing retention.
Strategic Plan Goal(s)
 |
Sustainable Environment |
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 eleven 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.
The conveyance piping installed as part of this project, connects the additional eleven extraction 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.
The Board of Supervisors acceptance of the work and authorization for the Director of the Division of Integrated Waste Management to record the Notice of Completion will begin the one-year construction warranty and allow staff to make the final payment to C.E.Cox Engineering, Inc.
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 eleven 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.
The conveyance piping installed as part of this project, connects the additional eleven extraction 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.
The Board of Supervisors acceptance of the work and authorization for the Director of the Division of Integrated Waste Management to record the Notice of Completion will begin the one-year construction warranty and allow staff to make the final payment to C.E.Cox Engineering, Inc.
Collaborations (including Board advisory groups and external partner agencies)
Not Applicable
Competitive Bid Process/Vendor Performance
This project was awarded through a competitive bidding process in accordance with State law.
Bids Received
Bids Received
| Bidder | Bid |
| C.E. Cox engineering, Inc. | $391,894 |
| Innovative Construction Solutions | $401,464 |
| RJ Gordon Construction | $464,464 |
| Syblon Reid | $606,936 |
| Cobabe Brothers Plumbing | $766,860 |
| Quam Engineering | Non-Responsive |
Fiscal Impact
Fiscal impact (see budgetary detail below)
Fiscal Impact (Expenditure)
- Total cost of recommended action:
- $ 400,240
- Amount budgeted for expenditure:
- $ 863,000
- Additional expenditure authority needed:
- $
- One-time commitment:
- Yes
Source of Funds for this Expenditure
- Sanitation Enterprise
- $400,240
Further explanation as needed:
Sufficient funds have been budgeted for this project in the 2021/22 Fiscal Year Budget in the Sanitation Enterprise Fund.
Attachments
Form Review
| Inbox | Reviewed By | Date |
|---|---|---|
| Financial Services | Tom Haynes | 06/14/2022 11:57 AM |
| County Counsel | Hope Welton | 06/17/2022 10:14 AM |
- Form Started By:
- Jeff Kieffer
- Started On:
- 05/13/2022 01:08 PM
- Final Approval Date:
- 06/17/2022