SITE INFORMATION AND CORRESPONDENCE FILE 2

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Stantec Consulting Services Inc. 3017 Kilgore Road Suite 100 Rancho Cordova CA 95670 Tel: (916)861-0400 Fax:(916)861-0430 Stagy - ED MAR 0 2 2012 February 29, 2012 ENVIRONMENTAL HEALTH PERMIT/SERVICES Ms. Vicki McCartney San Joaquin County Environmental Health Department u ' 600 East Main Street t Stockton, California 95202 Reference: Quarterly Status Summary Report— Fourth Quarter 2011 ARCO Service Station No. 2186 3212 North California Street Stockton, California 95204 File: 211611041.400.681 Dear Ms. McCartney: On behalf of Atlantic Richfield Company (ARC), a BP Affiliated Company, Stantec Consulting Services Inc. (Stantec) is forwarding the Quarterly Status Summary Report (QSSR) -- Fourth Quarter 2011 (4Q11) for ARCO Service Station No. 2186, located at 3212 North California Street in Stockton, California (site). Site Description The site is an active ARCO Service Station located on the corner of North California Street and Alpine Street in Stockton, California. The service station is currently comprised of a mini-mart; two 20,000-gallon, double-walled, fiberglass underground storage tanks; associated product lines; and two dispenser islands. The majority of the subject property is covered with an asphalt-paved parking lot and common landscaping. The site is bound to the east and to the south by residential properties, to the west by a commercial property, and north by a city park. According to the United States Geological Survey topographic map dated 1987, the elevation of the site is approximately 15 feet (ft) above mean sea level on relatively flat terrain. The closest open body of water is the Calaveras River, located approximately 4,000 ft north of the site. No changes have been made to the previous investigations and site history since the last report submittal [Semiannual Groundwater Monitoring Report Second Quarter 2091 (2Q11) dated September 19, 2011). Sensitive Receptors EMCON of Sacramento, California conducted a well search at the California Department of Water Resources in 1996 to identify water supply wells located within a half-mile radius of the subject site. One municipal well and seven domestic wells were identified during the search. The nearest municipal well is located approximately 1,100 ft to the north and the three nearest domestic wells are located approximately 2,000 ft to the northwest of the site. In 1998, Pinnacle Environmental identified a water supply well owned by the City of Stockton located approximately 1,100 ft west of the site. This well was reportedly situated in Oak Park. 2186 QSSR 4Q11.doc 1