TO: Board of Supervisors
FROM: Christopher Silke, District Engineer
REPORT BY: Christopher Silke, District Engineer
SUBJECT: Approval of Plans and Specifications and Authorization to Advertise for Bids for Water Supply Intake Utility Building Project, LB 24-01.
RECOMMENDATION
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Approve plans and specifications for the Water Supply Intake Utility Building Project, LB 24-01 and authorization to advertise for sealed bids and opening of the bids at a time, date, and location to be published by the District Engineer pursuant to Section 20150.8 of the Public Contract Code. (No Fiscal Impact; Discretionary)
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BACKGROUND
The District filed an application for public water system funding assistance through the Department of Water Resources (DWR) Small Community Drought Relief Program (SCDRP) in November 2021 seeking a total of $637,000 to cover costs associated with the District’s Emergency Drought Response. The project implements groundwater and sub-channel creek supply feasibility investigations and strengthens the system’s ability to sustain water supply during critically dry years. Project elements include:
1. The installation of a seasonal floating intake structure to compensate for declining water levels in Putah Creek due to severe drought,
2. Extending the water supply intake to a nearby alluvium gravel bar and replacing a dilapidated Concrete Masonry Unit (CMU) Intake Utility Building with a new building and a Potassium Permanganate chemical treatment process for pre-treatment of raw water,
3. Purchase and acquisition of portable pumping equipment, hoses and a tank placed at the water supply intake pool to carry out temporary water transfers within the Putah Creek basin from upstream pools to the stationary intake, and
4. Conduct hydrogeologic explorations for a potential alluvial or fractured rock deep well supply in proximity to the Berryessa Estates water service area that can satisfy the community’s maximum daily water demand.
DWR SCDRP Funding Agreement No. 240301B was issued to the District in June 2023 and formally executed on August 28, 2023. Terms of the Funding Agreement allow for eligible project reimbursement expenses dating back to April 29, 2022 through December 31, 2024. The seasonal floating intake, alluvium gravel bar intake extension and hydrogeologic investigations are complete. Project elements remaining to bid, construct and procure are replacement of the existing CMU Intake Utility Building with a precast concrete structure and securing creek pool transfer pumping equipment furnished by a vendor that is selected through competitive price proposals.
Construction plans and specifications are now complete for the new precast concrete utility building and demolition of the existing CMU structure along with its concrete foundation. The aged CMU building site will be restored to its natural state. Chainlink fence with pedestrian and maintenance access gates will be placed around the new precast concrete building perimeter. A new chemical containment shed will store potassium permanganate which will be injected into the raw water for treatment of low-level seasonal iron and manganese that can cause discolored water. The engineer’s estimate of construction cost is $275,000.
With the design plans and specifications now complete, the District Engineer requests approval to advertise the project for sealed bids and opening of the bids at a time, date, and location to be published by the District Engineer pursuant to Section 20150.8 of the Public Contract Code.
FISCAL & STRATEGIC PLAN IMPACT
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Is there a Fiscal Impact? |
No |
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Is it currently budgeted? |
Yes |
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Where is it budgeted? |
Fund 5220, Subdivision 5220500, Project 24019 |
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Is it Mandatory or Discretionary? |
Discretionary |
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Discretionary Justification: |
Approval of plans and specifications and authorization to advertise for sealed bids is necessary prior to the construction phase. |
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Is the general fund affected? |
No |
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Future fiscal impact: |
None |
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Consequences if not approved: |
District would forfeit grant money awarded by Department of Water Resources to support the project. |
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Additional Information |
Staff will return to the Board for award of a construction contract once bids are opened and analyzed. |
ENVIRONMENTAL IMPACT
ENVIRONMENTAL DETERMINATION: Consideration and possible adoption of a Categorical Exemption Class 1: It has been determined that this type of project does not have a significant effect on the environment and is exempt from the California Environmental Quality Act. [See Class 1 (“Existing Facilities”) which may be found in the guidelines for the implementation of the California Environmental Quality Act at 14 CCR §15301; see also Napa County’s Local Procedures for Implementing the California Environmental Quality Act, Appendix B.]