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Waterloo Food & Fuel - 3 - 4 August 2021 <br />3032 Waterloo Road <br />Stockton, San Joaquin County <br />Please sample all Site monitoring wells deemed functional in the 1Q21 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 />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 4th quarters 2021 and 1st quarter 2022. Please <br />monitor the batch extractions as proposed. <br />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 />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.