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SECOR 00 lriter'national Incorporated October 2, 2000 Pfd '._ Project 077 41941 330 S-9 Ms Lori Duncan San Joaquin County Public Health Services Environmental Health Division 304 East Weber Avenue, Third Floor Stockton, California 95202 Re Site Assessment Report ARCO Station 4595 6100 North Highway 99 Stockton, California Dear Ms Duncan SECOR International Incorporated (SECOR) has prepared this letter on behalf of Atlantic Richfield Company (ARCO) to document the installation of four groundwater monitoring wells and the drilling of three soil borings at the site referenced above (Figure 1) The purpose of this work wa'sto evaluate the horizontal and vertical extent of ADhydrocarbons in soil and groundwater beneath the site This work was perfor coed as described in the Work I'lunfot .Sill A%ses,%nleltt, dated February 28, 2000 The Wr�tk Plan was approved by San Joaquin County Public Health Services as indicated in their letters dated March 14 and March 22, 2000 (Attachment A) SITE BACKGROUND The site is located at 6100 North Highway 99 in Stockton, Calrfoi nra and rs an operating AMIPM mini-mart and ARCO service station The site is bordered by orchards to north, east, and south, and Highway 99 to the west The site ctu rently contains thr ee 12,000- gallon gasoline USTs and associated product lines and dispensers Additionally a domestic well supplying watee to the service Station is present at the southwest poitron of the property During September 1999 product lines and dispensers at the site were upgraded Twenty- one soil samples were collected fiorn beneath the product lines, vapor lines dispensers, and previous abandoned in place product lines TPHg was reported in eighteen of the twenty-one samples with concentrations ranging from 1 94 mg/kg to l 1,300 mg/kg Benzene was reported in fifteen samples at concentrations ranging from 0 03 16 nig/kg to 48 3 mg/kg MtBE was reported in fourteen of the samples ranging in concentration from 0 1 10 ting/kg to 0 47 mg/kg TBA, DIPE, EtBE, TAME, 1,2 DCA, and EDB were reported as nondetectable in all samples Approximately 189 tons of soil gene]ated during the removal of the undergr ound facilities and the trenching for new piping was disposed of at BFl Landfill in Livermore CA 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916 861 0400 91686104-301-ax www secor com