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' Shell Oil Com an <br /> CN �` E P Y <br /> P.O. Box 5278 <br /> March 26, 1993 MAR 3 1 1993 Concord,CA 94520-9998 <br /> FiNVIRONMENTAL <br /> t R' PE-q <br /> LIH (510) 675-6165 <br /> llt `� <br /> Ms_ Laurie A. Cotulla <br /> Program Manager <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> Post Office Box 2009 <br /> Stockton, California 95201 <br /> r <br /> Subject: Shell Service Station (WIC No. 204-7524-4404) <br /> 3011 West Benjamin Holt Drive, Stockton, CA <br /> Site Code: 1883 <br /> Dear Ms. Cotulla: <br /> This letter has been prepared in response to your letter of February <br /> 17, 1993, regarding the site referenced above. As provided by the <br /> State of California Water Resources Control Board Resolution 92-49, <br /> Shell Oil Company (Shell) wishes to bring to your attention a <br /> perceived technical conflict regarding the subject site. However, it <br /> is the intention of Shell, at this point, to resolve the conflict at <br /> the county level. <br /> Mr. Michael Infurna, of the San Joaquin County Environmental Health <br /> Division (SJCEHD) , has twice requested additional investigations be <br /> conducted in letters to Shell dated September 1, 1992, and February <br /> 17, 1993. <br /> In the September 1, 1992, letter, Mr. Infurna requested a <br /> "Preliminary Investigation and Evaluation Report" (PIER) be submitted <br /> for the site. On behalf of Shell, Aegis Environmental, Inc. (Aegis) , <br /> responded to the request in a letter dated December 31, 1992_ Aegis <br /> pointed out the following: <br /> 1) Applied GeoSystems (AGS) of Sacramento, California, drilled and <br /> sampled four soil borings on site in August 1988. The borings <br /> were completed as groundwater monitoring wells. The results of <br /> the investigation were reported to the SJCEHD in a "Assessment <br /> of Soil and Groundwater Contamination" report, dated September <br /> 16, 1988_ All soil and groundwater samples collected from the <br /> four borings/monitoring wells and analyzed were below the <br /> respective method detection and (Tri-Regional) Practical <br /> Quantitation Reporting Limits (PQL) . The four wells were <br /> abandoned in late 1989. <br /> 2) Aegis personnel supervised the drilling and sampling of ten soil <br /> borings on site in January 1990 (report dated April 13, 1990, <br /> copied to the SJCEHD) . The borings ranged in depth from 11.5 to <br /> 21.5 feet below surface_ Total petroleum hydrocarbons, as <br /> gasoline, and benzene were not indicated above the respective <br /> PQL by laboratory analysis in any soil samples collected from <br /> the borings. <br />