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orsdo" <br /> 25P AF'CoSuite 220 <br /> sY—0'4�—00 3839 Cantbridgc A 95682.9007 <br /> Z Cameron Durk; <br /> CAa <br /> T,1. 530.676.68M <br /> Fax.530.676.6885 <br /> t�^ � O� A Member o!The <br /> I bG( Iffp <br /> I . <br /> February 28,2000 <br /> Project 805678 <br /> Ran Rowe <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re: Preliminary Site Characterization Workplan foi ARCO Products Company Facility <br /> No. 5469, Located at 130 South Wilson Way, Stockton, California <br /> Dear Mr. Rowe: <br /> { On behalf of ARCO Products Company (ARCO), 1T Corporation (1T) is submitting this <br /> groundwater monitoring well installation workplan for the ARCO Products Company <br /> Facility No. 5469, located at 130 South Wilson Way, Stockton, California (see Figure 1). <br /> The proposed scope of work was developed in response to your letter dated February 2, <br /> 2000 requesting further characterization of soil and groundwater at the site. IT proposes to <br /> install three on-site groundwater monitoring wells to further characterize both soil and <br /> groundwater contaminant distribution at the site. Details are.presented in the following <br /> 1 sections. <br /> SITE BACKGROUND <br /> On February 11, 1999, an IT geologist observed the::removal and replacement of product <br /> delivery lines and associated dispensers. Soil samples were collected in the vicinity of the <br /> product delivery lines and associated dispenser ;locations during the removal and <br /> replacement activities. Soil samples were collected at depths ranging from 3.3 to 5.5 feet <br /> below ground surface (feet bgs). Samples collected in the vicinity of the dispenser islands <br /> indicated the presence of total petroleum hydrocarbons as gasoline (TPHG) at <br /> concentrations ranging from 1.03 (PIr9, 4 feet bgs) to 7.32 milligrams per kilograms <br /> (mg/kg) (PU4, 3.3 feet bgs); benzene at a concentration of 0.1$7 mg/kg (PUJ, 4.3 feet <br /> bgs); tert-butyl alcohol (TBA) at 44 mg/kg (PL-10,"4.3 feet bgs); and methyl tert-butyl <br /> ether (MTBE) ranging from 0.186 (PL-5, 4 feet bgs)':to 5.16 mg/kg (PL-10, 4.3 feet bgs). <br /> All other constituents did not exceed laboratory detection limits. Hydrocarbon constituents <br /> were not detected above laboratory detection limits in"'soil samples collected from product <br /> r <br /> delivery line locations in the vicinity of the underground storage tanks(USTs). <br />` SaeW:\CamPR\Data\Archivc\Arw\5469\Rcports15469p1Q3.docA5Usg:1 1T O)rporadon <br /> o2/2sroa <br />