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t 5 <br /> ���d, Suite 220 <br /> I Cameron Park, CA 95682-9007 <br /> .. ` 7e1. 530.676.6884 <br /> P 1g6 <br /> Fax.530.676.6885 <br /> the � Uup F F�� 2 � 2G�0 <br /> ��'' A hlem6cr of The IT Croup <br /> ENVIRC)NMEW'i=_L_ r-, A!TH <br /> PERMIT/SERVICES <br /> February 28, 2000 <br /> Project 805678 <br /> Ron Rowe <br /> San Joaquin County Public Health Services <br /> a Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> i <br /> Re: Preliminary Site Characterization Workplan for ARCO Products Company Facility <br /> No. 5469, Located at 130 South Wilson Way, Stockton, California <br /> i Dear Mr. Rowe: <br /> i <br /> On behalf of ARCO Products Corhpany (ARCO), IT Corporation (IT) is submitting this <br /> groundwater monitoring well installation workplan for the ARCO Products Company <br /> I 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 /> 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 /> I 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 (PLr9, 4 feet bgs) to 7.32 milligrams per kilograms <br /> (mg/kg) (PL-4, 3.3 feet bgs); benzene at a concentration of 0.187 mg/kg (PL-7, 4.3 feet <br /> bgs); tcrt-butyl alcohol (TBA) at 44 mg/kg (PLr10, 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 /> delivery line locations in the vicinity of the underground storage tanks (USTs). <br /> sac\N:\CamPk\Data%Archive\ArcoG54691Reports15469p103.doc-9511sg:1 1T Corporation <br /> 02/28/00 <br /> 5 <br /> F <br />