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Waterloo Food & Fuel - 3 - 4 August 2021 <br /> 3032 Waterloo Road <br /> Stockton, San Joaquin County <br /> 1. Please sample all Site monitoring wells deemed functional in the 1 Q21 GMR, as <br /> well as remedial wells EW-1 through EW-3 during 3rd quarter 2021 and submit a <br /> groundwater monitoring report (GMR) by 1 November 2021. In this report, and <br /> all subsequent GMRs, please include Site free product data, including measured <br /> depth to product and product thickness, in the current and historical groundwater <br /> data tables. Additionally, as part of the GMR, please include photos of well EW-1 <br /> and the nearby UST fill port, both with and without vault lids, and inside of the <br /> EW-1 well casing. <br /> 2. Central Valley Water Board staff does not concur with Apex's theory of an <br /> accidental diesel release into EW-1; however, staff concurs with groundwater <br /> remediation to reduce petroleum concentrations in wells that exceed the State <br /> Water Resources Control Board's Low Threat UST Case Closure Policy (LTCP). <br /> Following the 3rd quarter 2021 sampling event, please complete three batch <br /> extraction events consisting of 300 gallons removed from each of wells EW-1 <br /> through EW-3 during 3rd and 4t" quarters 2021 and 1st quarter 2022. Please <br /> monitor the batch extractions as proposed. <br /> 3. Please sample site monitoring wells and remedial wells EW-1 through EW-3 <br /> during 1st quarter 2022, following the 3rd batch extraction event, and submit a <br /> GMR by 1 April 2022. In this report, please include conclusions and <br /> recommendations related to current groundwater conditions, free product, the <br /> efficacy of the batch extractions, and the need for additional remedial action. <br /> Please include all free product measurement data collected during the batch <br /> extractions in the historical groundwater data tables. <br /> 4. In the January 2019 directive letter, Central Valley Water Boards staff concurred <br /> with a scope of work that included on-Site soil sampling and on- and off-site soil <br /> gas sampling. The soil gas sampling was intended to assess the potential vapor <br /> intrusion risk to off-Site properties. However, as conditions have changed in the <br /> past three years, after review of current Site conditions Staff no longer believe <br /> that the soil gas sampling scope of work is warranted. By 3 November 2021, <br /> please complete only the soil sampling scope of work as discussed and <br /> concurred with in the January 2019 directive letter and submit a Site Assessment <br /> Report. In this report, please provide discussion and comparison of the collected <br /> data to criteria established in the LTCP. <br />