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1 <br /> f .it Frr�� ♦ 4. �' 4 <br /> �} 93 JUN 21 PM 2: 0 2 <br /> : O2 Working To Restore Nature <br /> 1 <br /> 3164 Gold Camp Drive,Suite 200 <br /> Rancho Cordova,CA 95670 <br /> Phone (916) 852-6690 <br /> FAX (916)852-6688 <br /> I <br /> June 9, 1993 <br /> Mr. Chuck Carmel <br /> ARCO Products Company <br /> I P O Box 5$11 <br /> San Mateo, California 94402 <br /> Subject Status of Environmental Investigation, First Quarter 1993, and Addendum to <br /> Work Plan, ARCO Service Station No 2168, 441 Charter Way, Stockton, <br /> California <br /> Mr Carmel <br /> At the request of ARCO Products Company (ARCO), RESNA Industries (RESNA, <br /> formerly Applied GeoSystems) is reporting on the status of work conducted at the subject <br /> site (shown on Plate 1) during the first quarter 1993 and presenting an addendum to our <br /> Work Plan No 31009-4W dated May 17, 1991 Work conducted this quarter included <br /> drilling six soil borings, installing two ground-water monitoring wells and four vapor- <br /> extraction wells, measuring depths to water, collecting and analyzing soil and water samples, <br /> and performing ground-water monitoring The purpose of this work was to evaluate the <br /> geology and hydrogeology beneath the site and to evaluate the lateral and vertical extent <br /> of hydrocarbons in soil and to further evaluate hydrocarbons in ground water <br /> BACKGROUND <br /> Between July 1991 and May 1991, RESNA observed the drilling of 12 soil borings and the <br /> installation of three ground-water monitoring wells Plate 2 shows the location of soil <br /> borings and monitoring wells onsite Results of these investigations indicated residual <br /> hydrocarbons were detected in soil beneath the site, with the highest concentrations near <br /> the tanks and dispenser islands Because hydrocarbons were detected in soil, on August 5, <br /> 1991 ARCO requested the site be added to the San Joaquin County Public Health Services, <br /> Environmental Health Division (SJCPHS-EHD) pilot program <br /> 1)k <br /> � 0209ccar <br /> 31009-7 <br />