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San Joaquin County Environmental Health DepartmentDIRECTOR 2.' fN—7 G 1868 East Hazelton Avenue Donna Heron,REHS Stockton California 95205-62:32 PROGRAM COORDINATORS' Robert McClellon,REHS Jeff Carruesco,REHS,RDI cQ Kasey Foley,REHS Website: wwtv.sjgov.org1ehd Linda Turkatte,REHS Phone: (209)468-3420 Fax: (209)464••013$ I November 6, 2012 Ben Terry Sergio Morescalchi Chevron Environmental Management Company Atlantic Richfield Company 6101 Bollinger Canyon Road PO Box 1257 San Ramon, CA 94583 San Ramon, CA 94583 I Subject: Chevron 49-4275 and ARCO#2133 2905 &2908 Ben Holt Drive Stockton, CA 95207 The San Joaquin County Environmental Health Department (EHD) has received a No Further Action Required Concurrence letter from the Central Valley Regional Water Quality Control Board (CVRWQCB) dated September 20, 2012, for the above subject site. It is now necessary to plan the destruction of all wells installed as part of your site investigation and remedial action, as the EHD will not issue a Case Closure Letter for this site until the wells have been properly destroyed and all onsite waste material have been removed and properly disposed of. The wells are to be destroyed within 90 days of the date of this letter. Please submit a work plan that details the conditions and construction of the wells and the methods and materials to be used to destroy them. To be issued a well destruction permit the j proposal must comply with the San Joaquin County Well Standards requirements, including: Wells that have laboratory data from the last groundwater sampling event that demonstrate the presence of any contaminants of concern are to be destroyed by removing all the contents of the original borehole (conductor casing, well casing, screen, filter pack, grout sealant); the cleared borehole is then to be sealed with neat cement by grouting from the bottom up to a depth of three feet below grade. All wells with unknown construction and/or located in an area of known contamination are to be destroyed by removing all the contents of the original borehole as described above; the cleared borehole is then to be sealed with neat cement by grouting from the bottom up to a depth of three feet below grade. a Wells that have laboratory data from the last sampling event that report non-detectable concentrations of contaminants of concern, with acceptable laboratory detection limits, may be destroyed by pressure grouting with neat cement from the bottom up while leaving the well casing in place. Following that, a hole at least one foot larger in diameter than the originally drilled borehole shall be excavated around the outside of the well casing to a depth of 3 feet below the ground surface, and the well casing shall then