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Weston Solutions, Inc. <br /> Remedial Action Work Plan for the San Joaquin County Human Services Agency Site—Stockton, California <br /> PREVIOUS INVESTIGATIONS <br /> ■ Per requirements of Order R5-2015-0012, identification of proposed discrete remedial <br /> treatment,transition,and compliance zones,and identification of wells to monitor these <br /> zones. <br /> — If insufficient wells exist to properly monitor these zones, then new monitoring <br /> wells are to be proposed. <br /> ■ Proposed remedial monitoring schedule, and analytical suite to include at least <br /> hydrocarbons, arsenic, iron, manganese, chromium, hexavalent chromium, bromide, <br /> and bromate. <br /> — If BOS 200®is used,the injection of included electron acceptors such as nitrate and <br /> sulfate may require additional sampling in accordance with the Central Valley <br /> Salinity Alternatives for Long-term Sustainability(CVSAL TS)program <br /> ■ Proposed groundwater sampling to determine baseline concentrations for <br /> determination of remedial Action Levels for Order compliance. <br /> ■ Proposed Contingency Plan in the event that potential oxidation byproducts exceed <br /> Action Levels. <br /> 2-9 February 2021 <br />