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r San Joaquin County OpaU=`'•,C Environmental Health Department DIRECTOR . _ �� .•p Donna Heran,REHS 1868 East Hazelton Avenue Q: ,. •� PROGRAM COORDINATORS N: < Stockton, California 95205-6232 Robert McClellon,REHS Jeff Carruesco,REHS,RDI Kase Foley,REHS �Q-.. ••..��p Website: www.sjgov.org/ehd y Linda Turkatte,REHS Phone: (209) 468-3420 Rodney Estrada,REHS Fax: (209)464-0138 Adrienne Ellsaesser,REHS June 30, 2014 Mr. Dave Patten Chevron Environmental Management Company 6101 Bollinger Canyon Road, 5535 San Ramon, California 94583-5186 —Subject--Former-Cfievron•-Service-Station-9-0557 139 South Center Street Stockton, California Dear Mr. Patten: The California State Water Resources Control Board (State Water Board) has determined that the above-referenced. site meets the criteria specified in the State Water Board's Low Threat Underground Storage Tank Case Closure Policy (Low-threat Closure Policy), and has notified appropriate agencies and recipients of the pending case closure and of their opportunity to submit comments or questions regarding the pending closure. The sixty-day public participation period ended 20 January 2014. It is necessary now to plan and prepare to execute the destruction of all wells installed as part of the site investigation and remedial action. Please submit a scope of work proposal to the San Joaquin County Environmental Health Department 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 proposal must comply with the San Joaquin County Well Standards requirements, such as: • Wells that have laboratory data from the last sampling event that demonstrate the presence of any contaminants of concern remaining in-groundwater are to be destroyed by removing all the contents of the well [well casing (except steel conductor casing), screen, filter pack, grout sealant]; the cleared borehole is then to be sealed with neat cement from the bottom upward to the depth of three to five feet below grade. • All wells that'are obstructed, have unknown construction, or are located in an area of known or suspected contamination are to be destroyed by removing all the contents of the well [well casing (except steel conductor casing), screen, filter pack, grout sealant]; the cleared borehole is then to be sealed with neat cement from the bottom upward to the depth of three to five feet below grade.