TO: Members of the Governing Board
FROM: Christopher Silke, District Engineer
REPORT BY: Anna Martinez, Assistant Engineer
SUBJECT: Approval of Contract Change Orders exceeding the District Engineer’s authority for Phase II of the Wastewater Ponds Groundwater Inflow Mitigation Project, LB 18-02.
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RECOMMENDATION
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Approve and authorize the District Engineer to execute Contract Change Orders No. 2, 3, and 6 through 9, to Agreement No. 260360B (LBRID) with 2C Land and Timber Management Corp, to increase the maximum compensation for the construction contract from $844,514 to $1,143,646 for the “Wastewater Ponds Groundwater Inflow Mitigation Project.” (Fiscal Impact $299,132 Expense; Lake Berryessa Resort Improvement District Fund; Budgeted; Discretionary)
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BACKGROUND
Persistent heavy rainfall in the winter of 2017 filled the District’s wastewater ponds requiring overland disposal of wastewater from the District’s treated wastewater Pond 7 to prevent damage to the earthen pond berm should the pond exceed capacity and overflow. The overland discharge was in violation of the District’s Waste Discharge Requirements issued by the Central Valley Regional Water Quality Control Board (Regional Board). The Regional Board issued a Notice of Violation (NOV) in response to the discharge requiring the District to complete a water balance evaluation and submit a Work Plan to ensure sufficient storage and/or disposal capacity into the future.
GHD, Inc. was retained in 2017 (Contract No 170871B) to provide engineering study services necessary to address the requirement of the NOV. An initial design was proposed – installation of a vertical trench drain, replacement of the vintage 10" tar-coated steel pond inlet pipe, and drainage channel improvements at the site. In September 2018, the District, a designated disadvantaged community with a median household income of $43,200, submitted a Clean Water State Revolving Fund (CWSRF) principal forgiveness funding application t...
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