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l <br /> F <br /> r, lr,t,��,�L �►T a?_ HEALTII <br /> cR ICE <br /> Fir GROUNDWATER �3 9 OCT -8 P11 2: 22 <br /> ❑ TECHNOLOGY, INC. 1401 Halyard Drive,Suite 140,West Sacramento,CA 95691,(916)372.1700 <br /> FAX(916)372-8781 <br /> September 30, 1993 Project No. 02020 1211 i <br /> Ms. Laurie A. Cotulla <br /> REHS, Program Manager <br /> San Joaquin County Public Health Services <br /> 1601 East Hazelton Avenue <br /> Stockton, California <br /> i <br /> Subject: SOUTHLAND SITE NO. 20680 <br /> 9110 THORNTON ROAD <br /> STOCKTON, CALIFORNIA <br /> Dear Ms. Cotulla: <br /> Groundwater Technology, Inc. has prepared this letter on behalf of the Southland Corporation in <br /> response to the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> letter dated July 9, 1993 denying a request to certify site closure at the above referenced site, pending <br /> evaluation of additional data. The PHS/EHD formulated their response in two subheadings: <br /> Groundwater Contamination and Soil Contamination. This letter responds similarly. <br /> I <br /> i <br /> GROUNDWATER CONTAMINATION <br /> Domestic Well Sampling: <br /> The PHS/EHD fetter stated that groundwater samples should continue to be collected monthly from the <br /> domestic wells located at 9172 Thornton Road and 9156 Connie Avenue and quarterly from domestic <br /> wells 8968, 9036, 9140, and 1912. The monthly sampling request was based on 1992 groundwater data <br /> Indicating that contamination was detected in the samples collected from domestic wells 9172 (IVY) and <br /> 9156. <br /> Table 1 Attachment 1 resents a summa of the analytical results for domestic wells 9156 and 9172 <br /> ( ) p summary Yt <br /> from 1992 through June of 1993. As noted in the table, hydrocarbon concentrations were detected once <br /> in domestic well 9156 on October 29, 1992 and in domestic well 9172 (IVY) on April 21, 1992 at well <br /> below the State of California drinking water action levels (Table 2). <br /> i <br /> E <br /> Offices throughout the U.S.,Canada and Overseas <br />