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ATC Associates Inc. <br /> v 1117 Lone Palm Avenue, Suite 201 <br /> Modesto, California 95351 <br /> 209-579-2221 <br /> Fax: 209-579-2225 <br /> August 29, 2008 f <br /> 54.62605.0001 L <br /> Ms. Vicky McCartney <br /> r San Joaquin County S E i 0 ' 2008 <br /> Environmental Health Department <br /> 600 East Main Street ENVIRON6 EN T HEAL]H <br /> Stockton, CA 95202 PERMIT/SERVICES <br />'• Subject: Response to Correspondence Regarding Additional Subsurface Investigation <br /> Workplan, Former Thiemann's Service Station, 106 West Second Street, <br /> Ripon, California <br /> Ms. McCartney, <br /> In ATC's Additional Subsurface Investigation Workplan, dated July 16, 2008, ATC <br /> summarizes a proposed scope of work for the advancement of three vertical soil borings <br /> utilizing Cone Penetrometer Test (CPT) drilling methods. In the workplan, ATC <br /> mentions collecting soil and groundwater samples however, ATC does not intend to <br /> submit soil samples for chemical analysis. <br /> Soil samples will only be characterized using CPT methods. ATC concurs with San <br /> Joaquin County Environmental Health Department (SJCE'ID) that the vertical extent of <br /> soil contamination has been sufficiently characterized, and is only interested in <br /> characterizing the vertical extent of the petroleum hydrocarbon plume in groundwater. <br /> While the workplan indicates that approximately two groundwater samples will be <br /> collected from each CPT boring location, the final number' <br /> samples wilt be determined <br /> in the field based on information provided by the CPT drilling activities. Additionally, <br /> ATC concurs with advancing the first CPT boring near the identified source area to an <br /> approximate depth of 100 to 150 feet below ground surface (bgs). The remaining CPT <br /> borings will be advanced to depths based on subsurface conditions associated with the <br /> first boring as long as the depths of soil types and water-bearing zones can be correlated. <br /> k <br />