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{ <br /> BROWN AND CALDWELL �Pn'ty <br /> CONSULTING ENGINEERS } E <br /> July 25, 1989 <br /> L <br /> Ms. Laurie Cotulla <br /> San Joaquin County Local Health District <br /> 1601 East Hazelton Avenue <br /> Post Office Box 2009 <br /> Stockton, California 95201 017-3174-04/1 <br /> Subject: Site Investigation Report ARCO Station 2093, <br /> Tracy, California <br /> f <br /> Dear Ms. Cotulla: <br /> This letter report presents a summary of activities performed by Brown and Caldwell and <br /> American Environmental Management Corporation (AEMC) at the subject site between <br /> December 1986 and January 1989. The laboratory and field results of activity performed by <br /> Brown and Caldwell after January 1989 at the site are presented in-detail.. The site is located. <br /> at 3425 Tracy Boulevard, Tracy, California (see Figure 1). . During March 1989, Brown and <br /> Caldwell performed a site investigation which included the drilling,of three boreholes and the <br /> installation of monitoring wells in the boreholes. The purpose of the March 1989 investiga- <br /> tion was to better define the extent of hydrocarbons that-had,previously been identified in the <br /> soil and groundwater at.the site. <br /> BACKGROUND <br /> On December 5, 1986, AEMC removed one 500-gallon waste oil tank and sampled the under- <br /> lying soil. Analytical results of the soil samples, indicated-the .presence of hydrocarbons. <br /> Additional soil was removed and soil samples were collected from the excavation on <br /> December 17, 1986. Hydrocarbons were identified in the.sampies,'from the former waste oil <br /> tank area. <br /> Brown and Caldwell was authorized by ARCO Products Company (ARCO) in Task Order <br /> Number 2093-1, dated April 16, 1987, to supervise further excavation, collect, and analyze a <br /> third set of samples from the excavation of the former waste oil tank. On January 21, 1987, <br /> Brown and Caldwell personnel collected the soil samples.' Analytical results of.these samples <br /> indicated that hydrocarbons had possibly migrated-downward to the groundwater surface. <br /> Brown and Caldwell reported the analytical 'results of this investigation in a report to ARCO <br /> dated February 4, 1987. � <br /> i <br /> 723 S STREET SACRAMENTO,CALIFORNIA 95814-7092•(916)444.0123 i <br />