WORK PLANS FILE 2 - Laserfiche WebLink

Home Browse Search

Stantec Consulting Services Inc. 3017 Kilgore Road Suite 100 Rancho Cordova CA 95670 TeL (916)861-0400 Fax:(916)861-0430 staIfltlec February 7, 2012 RECEIVED Ms. Vicki McCartney FEB �� San Joaquin County Environmental Health Department East Main Street Stockton, IRWRONMENTpLHFALTff S#ockton, California 95202 1 PERMRCSERVICES Reference: Well Destruction Work Plan ARCO Service Station No. 2186 3212 North California Street Stockton, California 95204 Stantec Project No. 211611041.402.4580 Dear Ms. McCartney: Stantec Consulting Services Inc. (Stantec) has prepared this Well Destruction Worts Plan (Work Plan) on behalf of Atlantic Richfield Company (ARCO), a BP affiliated company, to propose the destruction of the well network associated with ARCO Service Station No. 2186 located at 3212 North California Street in Stockton, California (the "site"). In a letter dated January 4, 2012 (Appendix A), the San Joaquin County Environmental Health Department (SJCEHD) confirmed the receipt of a No Further Action Required Concurrence letter from the California Regional Water Quality Control Board - Central Valley Region (CRWQCB-CVR), dated December 2, 2011. In order to complete the case closure, the nine groundwater monitoring wells and eight ti 1 remediation wells will be destroyed. The following Work Plan includes a brief description of the site, the proposed well destruction activities, implementation schedule, and submittal of a summary report. SITE BACKGROUND Active ARCO Service Station No. 2186 is 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 (UST); 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. PROPOSED SCOPE OF WORK The most recent groundwater analyses from ten wells MW-2, MW-3R, MW-4 through MW-8, VW-1B, VW-2B, and VW-3B indicated constituents of concern (COC) below the laboratory method reporting limits (MRL) and/or maximum contaminant levels (MCL); therefore, Stantec proposes to destroy wells MW-2, MW-3R, MW-4 through MW-8, VW-1B, VW-213, and VW-3B via pressure-grouting. The last vapor analysis from the influent location of the former soil vapor