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California 1,,.�gional Water Qualityontrol.Board ig Central Valley Region <br /> Peter M.Rooney Sacramento Main Office Ed J.SchnabelSecretary for Internet Address: http://www.swrcb.ca.gov/-rwgcb5/home.html '`- r! Chair <br /> Environmental 3443 Routier Road,Suite A,Sacramento,California,9 827-3003 ' <br /> Protection Phone(9I6)255-3000•FAX(916)255=3015:^i : It 0" <br /> 9 October 1998 <br /> Mr. Ronald Nunan <br /> 651 Gateway Boulevard#790 <br /> South San Francisco, CA 94808 <br /> REPORT REVIEW AND REQUEST FOR WORKPLAN,FORMER TOWN & COUNTRY <br /> CHEVRON, 13336 E. HWY. 88, LOCKEFORD, SAN JOAQUIN COUNTY <br /> I reviewed the 13 July 1998 report Excavation for One Soil Boring, (report) submitted on your behalf by <br /> GeoSoly, LLC. The report presents a summary of the soil boring and sampling activities completed at <br /> your site between 26 June and 1 July 1998. The analytical results of the single groundwater sample <br /> revealed elevated concentrations of TPHg, benzene and toluene. <br /> Based on the analytical results of the groundwater sample collected from boring B7, the extent of <br /> groundwater impact must be determined below your site. Please submit a workplan to San Joaquin <br /> County Environmental Health Division and the Regional Board, to address drilling three soil borings to <br /> groundwater, sampling soil from the capillary fringe and saturated zone, and collecting one groundwater <br /> sample from each soil boring. All soil and groundwater samples must be analyzed for TPHg,BTEX and <br /> the fuel oxygenates using EPA Methods 8015/8020 and 8260. The groundwater samples must be <br /> collected using a technology that provides samples representative of chemical and hydrogeologic <br /> conditions (please see enclosed memo). The alternative to using appropriate sampling technology is to <br /> install three monitoring wells and to begin a groundwater monitoring program. <br /> The report also provides a calculation for groundwater flow direction and hydraulic gradient. The source <br /> of the groundwater elevation data is not appropriate for these calculations (please see enclosed memo). <br /> Because no monitoring wells are located at the site or in the vicinity of the site, a more reliable hydraulic <br /> gradient and flow direction for the area may be obtained from regional groundwater maps or through the <br /> San Joaquin County Environmental Health Division. <br /> If you have any questions, please contact me at(916) 255-3132. <br /> M R.LIST �� <br /> E gineering Geologist <br /> cc: Ms. Pamela Rarick, State Water Resources Control Board, UST Cleanup Fund, Sacramento <br /> Mr. Jeff Wong, San Joaquin County Environmental Health Division, Stockton <br /> Mr. Frank Goldman, GeoSoly, LLC., Sonoma <br /> California Environmental Protection Agency <br /> .1 Recycled Paper <br />