TO: Members of the Governing Board of Lake Berryessa Resort Improvement District
FROM: Christopher Silke, District Engineer
REPORT BY: Christopher Silke, District Engineer
SUBJECT: Professional Services Agreement 240306B with GHD, Inc. and Associated Budget Amendment for Program 19007 Wastewater Ponds Groundwater Inflow Mitigation
RECOMMENDATION
title
Approve and authorize Agreement No. 240306B with GHD, Inc. for a maximum of $60,188 to conduct geotechnical site investigations and develop a technical report that recommends the basis for designing construction upgrades to Wastewater Ponds 1 - 3 earthen berms, and approve a Budget Amendment. (Fiscal Impact: $60,188, LBRID Fund 5220, Subdivision 5220500, Project 19007, Not Budgeted; Discretionary)
[4/5 vote required]
body
BACKGROUND
Heavy rainfall, runoff, and saturated soil conditions in the winter of 2017 caused a series of spills from District infrastructure. The Central Valley Regional Water Quality Control Board (Regional Board) subsequently served the District with a Notice of Violation in April 2017. To address the violations, Regional Board ordered the District to complete a Revised Water Balance Evaluation and submit a Work Plan if a registered California Professional Engineer finds 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 basis for conducting a technical 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. was also tasked with inspecting the original inlet piping constructed in the mid-1960s for Ponds 1 through 3. In their June 2017 Revised Water Balance Report, the engineering consultant team concluded t...
Click here for full text