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1.0 INTRODUCTION <br /> ' This report presents the results of TRC Environmental Corporation's (TRC) groundwater <br /> investigation for Barclays Business Credit, at a site located at 11800 South Harlan Road, in <br /> ' Lathrop, California (Figure 1). The Sharpe Army Depot is located directly to the east of the site, <br /> and has a known groundwater contamination plume (Trichloroethene [TCE]) that has migrated <br /> towards the northwest. The groundwater in the first 3 aquifers beneath the Sharpe Army <br /> tDepot, known as the A-, B-, and C-aquifers, has been contaminated with TCE. A monitoring <br /> well cluster is located approximately 100 feet to the west of the site (station 517). Monitoring <br /> ' of groundwater from the A-, B-, and C-aquifers has been performed by the Army since at least <br /> 1990. Results have shown sporadic detection of TCE in groundwater from the A- and B-aquifer <br /> wells, and continuous detection of TCE in the groundwater from the C-aquifer. The purpose <br /> ' of this investigation was to determine whether the groundwater, from the C-aquifer, beneath <br /> the site had been impacted by the groundwater contamination from Sharpe Army Depot. <br /> tThe groundwater investigation activities were performed in accordance with TRC's Proposal <br /> to install Groundwater Monitoring Wells, dated June 30, 1993. Previous work at the site <br /> ' includes a Preliminary Site Assessment, performed by TRC, dated June 9, 1993. <br /> ' 2.0 SCOPE OF WORK <br /> ' To investigate the potential for TCE contamination of the C-aquifer from the neighboring Sharpe <br /> Army Depot, TRC drilled a 140 foot deep pilot boring which was lithologically and geophysically <br /> 1 logged. A separate boring was drilled within 10 feet of the pilot boring and a 117.5 foot deep <br /> double cased groundwater monitoring well was installed (Figure 2). TRC then developed and <br /> sampled the monitoring well. The groundwater sample was sent to a State certified analytical <br /> laboratory for analysis of volatile organic compounds by EPA Test Method 8240. <br /> t The monitoring well was installed under permit from the San Joaquin Public Health Services, <br /> Environmental Health Division. <br /> ' 14744003.013 1 <br /> TRC <br />