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California&gional Water Quality Cce <br /> rol Board <br /> ` <br /> Central Valley Region <br /> Katherine Hart, Chair oa <br /> 11020 Sun Center Drive,#200,Rancho Cordova,California 95670-6114 Edmund G.Brown Jr. <br /> Linda S.Adams (9 16)464-3291 •FAX(9 16)464-4645 Governor <br /> Acting Secretary for http://www.waterboards.ca.gov/centralvaIley <br /> Environmental Protection <br /> 8 February 2011 <br /> Mr. Eric Jenks <br /> Wilbur-Ellis Company <br /> P.O. Box 1030 <br /> Marysville, CA 95901 <br /> REVIEW OF THE OFF-SITE SOIL GAS SAMPLING COUNTY <br /> PLAN, JOHN TAYLOR <br /> FERTILIZERS CO. STOCKTON, SAN JOAQ <br /> Staff of the California Regional Water Quality Control Board, Central Valley Region (Central <br /> Valley Water Board) has reviewed the Off-Site Soil Gas Sampling Work Plan (Work Plan) for <br /> the subject site, located at 1819 South Argonaut Street in Stockton, San Joaquin County, <br /> California. The Work Plan was prepared on your behalf by Geosyntec consultants, and was <br /> received by the Central Valley Water Board on 2 February 2011. <br /> In a meeting on 27 January 2011, the Central Valley Water Board staff requested JTF/Wilbur- <br /> Ellis to conduct soil gas sampling as part of site hazard assessment. Groundwater <br /> investigations have documented the presence of elevated levels of 1,2-DCP and 1,2,3-TCP in <br /> excess of regulatory standards for protection of human health in groundwater. Soil gas <br /> sampling is necessary to provide information on possible volatile organic compounds (VOCs) <br /> contamination in soil vapor underneath the residential houses downgradient from the site. <br /> Wilbur-Ellis has proposed to install two temporary gas probes SG-1 and SG-2 on South <br /> Argonaut Street to a target depth of 5 feet below ground surface. <br /> Central Valley Water Board staff concurs with the proposed soil gas sampling work plan. It is <br /> stated in the work plan that the sampling procedures for soil gas samples will follow the <br /> "Advisory-Active Soil Gas Investigations," (DTSC/LARWQCB, 2010). Please confirm that leak <br /> testing will be conducted as per the cited guidance. <br /> Provide at least advance ten-day notice of field activities to allow the opportunity for Central <br /> Valley Water Board staff to observe the sampling activities. All necessary permits and utility <br /> clearance(s) should be obtained arthrto Sewalia atting 9 6t464 4658, ohe tion. iyou r by Efma I at have questions or <br /> comments, please contact Siddh <br /> ssewalia(a-)waterboards.ca.gov <br /> Siddharth Sewalia <br /> Water Resource Control Engineer <br /> Private Sites Cleanup Unit <br /> California Environmental Protection Agency <br /> �aRecycled Paper <br />