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1414/ <br />ci) <br />-("C\ <br />Ox, <br />'IL /Fos \•1\ <br />Alan M. Buehler, P.G. <br />Engineering Geologist <br />Chase Chevrolet - 2 - 4 January 2018 <br />424 North Van Buren Street <br />Stockton, San Joaquin County <br />Boring SB-1 is proposed just downgradient of the source area (former UST #7). and SB-2 is <br />proposed near the downgradient extent of hydrocarbon impact to groundwater, as <br />determined by the most recent groundwater data (October 2003). Soil gas wells SV-1 <br />through SV-3 are proposed beneath the retail units along Fremont Street on the ground floor <br />of the parking garage. As such, the proposed scope of work appears adequate for initial <br />assessment of current soil. groundwater, and soil gas concentrations beneath the Site. <br />Central Valley Water Board staff concurs with the scope of work as proposed in the Work <br />Plan, and has the following comments: <br />By 13 April 2018, please submit a Site Assessment Report which details the <br />completion of the proposed scope of work and the resultant findings. Please include <br />all current and historical soil, groundwater, and soil gas data in tabular form, and a <br />comparison of current data to criteria established in the State Water Resources <br />Control Board's Low Threat Underground Storage Tank Case Closure Policy (LTCP). <br />Please also include conclusions and recommendations for additional lateral and <br />vertical assessment of hydrocarbon impacts to groundwater and for the installation of <br />monitoring wells, if necessary. <br />Central Valley Water Board staff is aware that the response time for some agency <br />records requests related to the sensitive receptor survey can be lengthy. Please <br />notify Central Valley Water Board staff via email once all of the records are received, <br />and submit a Sensitive Receptor Survey Report within 30 days of receipt of the final <br />records. The Sensitive Receptor Survey Report may be included as part of the Site <br />Assessment Report if records are received in time. <br />If you have any questions or concerns regarding comments in this letter please call me at <br />(916) 464-4615 or contact me by email at alan.buehler@waterboards.ca.gov . <br />cc: Sriram lyer, State Water Resources Control Board, UST Cleanup Fund, Sacramento <br />Michael Kith, San Joaquin County Environmental Health Department, Stockton <br />John Chase, Chase Chevrolet, 6441 Holman Road, Stockton 95212 <br />Jaff Auchterlonie, Stantec Consulting Services Inc., 555 Capitol Mall #650, <br />Sacramento 95814