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I I 14 February 2020 AdvanCedGe o An Project No. 1]-004T rmn�� v.no ny Page 3 of 4 PROCEDURES As required, a health and safety plan will he prepared in accordance with Occupational Safety and Health Guidance Manual for Hazardous Wash Site Activities (National Institute for Occupational Safely and Health Administration, U.S. Coast Guard! and U.S. Environmental Protection Agency, 1985). Prior to drilling activities, each proposed drilling location will he clearly marked, and utility clearance obtained through Underground Service Alert. Well ahandonmentMestruction permits will be obtained from the San Joaquin County Environmental Health Department (EHD); additionally, the EHD will he notifietl a minimum of 48-hours prior to commencement of well destruction activities. Prior to well destruction activities, all wells will he checked for total depth and well integrity using a Solinsl water level meter. Any abstractions found in the wells will be removed. AGI proposes to destroy wells W4, W-7, and W-B by over-drilling. The wells will be drilled-out to the total depth of the wells utilizing a hollow stemauger drill rig equipped with 8.25-inch diameter augers. All original well construction materials will be removed (including well casing, screen, filter pack, and annular seal) by the drill rig to ensure that no residual contamination is sealed within the abandoned borehole and a vertical conduit doesn't remain. The borings will be completely backfilled to surface grade with a cement grout mixture (Portland type II) and finished at the surface with native soil or concrete to match the existing surface. The grunt mixture will consist of a ratio of not more than six gallons walerfor every g pound sack of Portland type II cement. The drill rig hollow stem augers will be utilized as a tremie pipe during deployment of the grout mixture. Any groundwater displaced by the grout mixture will be routed into properly labeled Department of Transportation (DOT)-approved 55-gallon drums. All investigation derived waste will be cenfalnerized in property labeled DOT approved 55-gallon tlrums and disposed as a non-hazardous waste. REPORTING Upon completion of Said work and disposal of investigation derived waste, a well destruction report describing well destruction activities and procedures, including documentation of waste disposal from well destruction and other activities will be prepared and submitted to the EHD and CVRWOCB. The report will be in a format acceptable b the EHD and the CVRWOCB and will be reviewed and signed by a California Professional Geologist.