TO: Members of the Governing Board
FROM: Chris Silke, District Engineer
REPORT BY: Anna Martinez, Assistant Engineer
SUBJECT: Approval of Plans and Specifications and Authorization to Advertise for Bids for Phase II of the "LBRID Wastewater Ponds Groundwater Inflow Mitigation Project" (LB 18-01)
RECOMMENDATION
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Approve the Plans and Specifications for Phase II of the "LBRID Wastewater Ponds Groundwater Inflow Mitigation Project" and authorize the advertisement 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)
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BACKGROUND
Persistent heavy rainfall, runoff, and saturated soil conditions in the winter of 2017 filled Lake Berryessa Resort Improvement District (LBRID) wastewater ponds. Stored treated wastewater in Pond 7 had to be removed through the irrigation pump station and onto the land disposal fields to avoid damage to the earthen berm. Uncontrolled overland runoff ensued. The District's Waste Discharge Requirements (WDRs) permit prohibits land application runoff beyond tailwater capture ditches that return flow back to the ponds. Central Valley Regional Water Quality Control Board (Regional Board) subsequently served the District with a Notice of Violation in April 2017. To address the violation, Regional Board ordered the District to complete a Revised Water Balance Evaluation and submit a Work Plan if it is found that there is insufficient storage and/or disposal capacity. The District authorized Agreement No. 170871B with GHD, Inc. in May 2017 to provide engineering study services. The scope of the investigation centered on Water Balance Update and Calibration Model tasks executed in conformance with the Regional Board guidelines. The review of the wastewater ponds and irrigation facilities was to assess the adequacy for storing and handling a 100-year annual return precipitation winter period. GHD, Inc. w...
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