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Taj M. Bahadori, P.E. Senior Civil Engineer San Joaquin County Department of Public Works Solid Waste Division 1810 E. Hazelton Avenue Stockton, CA 95201 • APTIM 180 Promenade Circle, Suite 320 Sacramento, CA 95834 Telephone: 925-457-1130 July 6, 2018 Project 631230195 Re: Response to June 6, 2018 Notice of Violation of the Second Semester and Annual 2017 Groundwater Monitoring Report for the Foothill Sanitary Landfill in San Joaquin County Dear Mr. Bahadori: This letter is in response to the Regional Water Quality Control Board's (RWQCB) Notice of Violation (NOV) of the Second Semester and Annual 2017 Groundwater Monitoring Report for the Foothill Sanitary Landfill (FSL) dated June 6, 2018. The NOV requested San Joaquin County (County) to submit a Work Plan by July 16, 2018. The Work Plan is requested to respond to the following three issues: Install one groundwater monitoring well at the point of compliance of Module I, near gas probe SG -6. The basis for this well is to provide additional control across the site for groundwater flow direction and gradient and to provide additional capability to detect a release at the earliest possible time from the Unit. Either re -install or re -construct background well MW -4. Provide reasoning in the work plan, why the last four single completion gas probes (SG -4, -5, -7, & -9) have not been reconstructed as triple completion gas probes. Work Plan and Comments Thereto Install Monitoring Well near SG -6 The RWQCB stated in the NOV that the Detection Monitoring Program (DMP) for the FSL is deficient and that there are not a sufficient number of wells at the eastern Point of Compliance of Module I to allow for the detection of a release from the unit, or a sufficient number of wells that provide the best assurance of the earliest possible detection of a 2018-07-16 FH Workplan