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f <br /> y <br /> \.IMWMIN� DIEM <br /> // <br /> SIERRA <br /> 1987', The underground storage tanks were removed from the northeast corner of the station <br /> in December 1986. The underground storage tanks were relocated to the southwestern portion <br /> of the property,behind the service station building, f <br /> i. <br /> 3 <br /> In January 1987:GTI drilled and installed one monitoring;well(MW-1)to a depth of 52 feet <br /> t <br /> in the former underground storage tanks area. Two soil samples from the boring were analyzed <br /> for TPPH as gasoline and benzene, toluene and xylenes 111371X.',TPPH and BTX were not'detebted <br /> in soil samples from the boring Aground water sample was a]so analyzed for 1YFH and BTX,: <br /> ? Nine hundred and ninety parts per billion(990 ppb)TPPH as gasoline were detected in the ground <br /> water sample fror i the well. Thirty-two(32) ppb benzene was also detected in the ground water` <br /> sample from the well. <br /> In January, March and June 1990, SES personnel visited the site to monitor the well, <br /> r There was insufnelent water in the monitoring well for sampling. <br /> r ,. <br /> 1.3 Current Site Use and Area Business Survey <br /> � _ I <br /> The site Is currently an operating service station retailing regular,unleaded and premium <br /> unleaded gasoline. The site Is located Ina commercial district of Stockton(Figure 2,Appendix A). , <br /> A subsurface Investigation, focuser,; on two dry cleaning businesses, is g <br /> on- oin at the <br /> on-going <br /> Lincoln Center property(north and west of the Chevron site). Trichloroethene has been detected <br /> in ground water at the Lincoln Center. Numerous soil borings have been drilied and monitoring <br /> wells Installed.2 San Joaquin County and,Regional(Nater Quality Control Board Records were <br /> r not available for review at the time of this report. <br /> Groundwater Technology Inc- 1987,Consultant's report prepared for Chevron,February 27, 1987.8 pp,and <br /> 3appendices. <br /> 5cheider, Steve, 1990, telephone eonversailon between Steve Schelder, San Joaquin County Environmental <br /> Health Speelallst,and Chris Bramer,SES Project Geologist,October 4, 1994, <br /> } <br /> Page 3 <br /> I: <br />