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r <br /> • k <br /> Brawn and Caldw6t <br /> p Consultants <br /> 723 S Street <br /> Sacramento <br /> California 95814-7092 ;1.._ <br /> (916) 16)4423 <br /> OR E C rEi <br /> (91 [916)444-8437 r� <br /> ,l U L A 1 1992 <br /> June 26, 1992 ENVIRONMENTAL, HEALTH <br /> PERMIT/SERVICES <br /> Mr. Chuck Cannel <br /> ARCO Products Company <br /> 2000 Alameda de las Pulgas <br /> Post Office Box 5811 <br /> San Mateo, California 94402 017-6661-04/1 <br /> Subject: Results from Soil and Groundwater Sampling, <br /> ARCO Station 6080, Lathrop, California <br /> Dear Mr. Carmel: <br /> This letter report summarizes the results of our recent soil and groundwater investigation at <br /> ARCO Products Company (ARCO) Station 6080, located at 85 E. Louise Avenue, Lathrop, <br /> California. The work was performed under Task Order 6080-92-2. The purpose of the work <br /> ' was to further investigate whether soil and/or groundwater have been affected with <br /> hydrocarbons in the vicinity of the former waste oil tank excavation at the project site. The <br /> following sections summarize the site history, field work, results, and discussion of this <br /> investigation. <br /> Site History <br /> An initial site investigation was performed at this facility in 1987 after a waste oil tank had <br /> been removed. Sia boreholes were drilled, and groundwater monitoring wells were installed <br /> in three of the boreholes (AL-1, AL-2, and AL-4) (Figure 1). The results indicated that only <br /> minor concentrations of total petroleum hydrocarbons (TPH) were found in two soil samples <br /> [29 milligrams per kilogram (mg/kg) in AL-1 at a depth of 6 feet and 10 mg/kg in AL-5 at <br /> a depth of 5 feet] (Table 1). Hydrocarbon constituents were not detected in the groundwater <br /> samples collected in April or December, 1987, or samples collected again in July 1988. <br /> Fieldwork <br /> On March 19, 1992,Brown and Caldwell Consultants personnel supervised the drilling of two <br /> boreholes at the site (HP-1 and HP-2) (Figure 1). The field methods that were used are <br /> described in our work pian dated February 10, 1992. Both boreholes were drilled to a depth <br /> 666r%CoRREsrta144X-2 <br />