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Stallworth Auto Detail - 2 - 19 September 2023 The MRP requires quarterly monitoring and reporting. Central Valley Water Board staff was told by AGI staff that groundwater monitoring was not performed during the second quarter 2023, and has not yet been performed during the third quarter 2023. You are responsible for complying with the NOA and MRP. Failure to comply with the NOA and MRP may result in issuance of monetary penalties (fines). The Third Quarter 2023 Groundwater Monitoring Report is due 30 October 2023. Central Valley Water Board staff requests additional work and has the following comments: 1. In letters dated, 29 May 2018, 19 April 2019, and 19 April 2022, Central Valley Water Board staff requested submission of a work plan for installation of an intermediate screened well, screened between 60 and 70 feet below ground surface (ft bgs). This well is needed to complete down-gradient delineation and to aid in determining plume stability and trends. To date, the requested work plan has not been submitted. Central Valley Water Board staff continue to believe that this well is needed to define the nature, extent, and mobility of the release, and to allow for determination of plume stability and trends. Therefore, as soon as possible, but no later than 31 December 2023, submit a Site Assessment Work Plan. 2. In a letter dated 21 July 2023, Central Valley Water Board staff requested submission of a work plan for shallow soil sampling by 31 October 2023. Collection of shallow soil samples in the vicinity of the former fuel USTs is still needed to evaluate Site conditions for direct contact and for use in evaluation of risk to human health due to vapor intrusion to indoor air. To the GeoTracker case file, staff added County letters from 1994 and 1991 that include waste oil tank and dispenser island sample lab results that indicate those systems did not have a release; therefore, staff rescind the request for soil samples in those areas. Please include a scope of work for shallow soil sampling in the vicinity of the former fuel USTs in the Site Assessment Work Plan due 31 December 2023. 3. Conditions at the Site fail low threat closure vapor intrusion criteria due to benzene concentrations in groundwater greater than 1,000 micrograms per liter (fag/L) and unknown petroleum impacts to shallow soil. Collection of a soil gas sample between wells MW-1A/MW-1B and the Site building is needed to allow for evaluation of risk to human health due to vapor intrusion to indoor air. Please include a scope for work for soil gas sampling in the Work Plan due 31 December 2023. 4. In an email dated 12 July 2023, you stated that you would like to participate in the Expedited Claims Account Program (ECAP), a program within the Underground Storage Tank Cleanup Fund. Central Valley Water Board staff supports your desire to participate in ECAP and looks forward to working with State Water Resources Control Board staff and yourself to move this project forward.