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12 July 2019 AdvancedGeo <br />AGE Project No. 13-2947 <br /> Environmental <br />Page 2 of 3 <br />PROCEDURES <br />As required, a health and safety plan was prepared in accordance with Occupational <br />Safety and Health Guidance Manual for Hazardous Waste Site Activities (National <br />Institute for Occupational Safety and Health Administration, U.S. Coast Guard and U.S. <br />Environmental Protection Agency, 1985). Prior to drilling activities, each proposed drilling <br />location will be clearly marked and utility clearance obtained through Underground <br />Service Alert. A well abandonment/destruction permit will be obtained from the San <br />Joaquin County Environmental Health Department (SJCEHD); additionally, the SJCEHD <br />will be notified a minimum of 48-hours prior to commencement of well destruction <br />activities. <br />Prior to well destruction activities, all wells will be checked for total depth and well integrity <br />using a Solinst water level meter. Any obstructions found in the well will be removed. <br />AGE is proposing to destroy wells MW-1 through MW-10 by removing all material within <br />the original boreholes utilizing over-drill techniques. The abandonment of wells MW-1 <br />though MW-10 will be performed utilizing a track-mounted CME-75 high torque mobile <br />drill rig; all ten wells will be drilled-out to one foot deeper than the total depth of the wells <br />utilizing 8.25-inch diameter hollow-stem augers. All original well construction materials <br />will be removed (including well casing, screen, filter pack, and annular seal) by the drill <br />rig to ensure that no residual contamination is sealed within the abandoned borehole nor <br />a filter pack remaining to act as a vertical conduit. <br />All ten borings will be completely backfilled to surface grade with a cement grout mixture <br />(Portland type II) and covered with either concrete or asphalt, depending on the <br />surrounding surface material. The grout mixture will consist of a ratio of not more than six <br />gallons water for every 94-pound sack of Portland type II cement. The drill rig hollow stem <br />augers will be utilized as a tremie pipe during deployment of the grout mixture. Any <br />groundwater displaced by the grout mixture will be routed into properly labeled <br />Department of Transportation (DOT) - approved 55-gallon drums. <br />Soil cuttings generated during drilling activities and rinseate will be containerized in <br />properly labeled DOT-approved 55-gallon drums and disposed as a non-hazardous <br />waste. <br />REPORTING <br />Upon completion of field work and disposal of soil-cuttings, a well destruction report <br />describing well destruction activities and procedures, including documentation of waste <br />disposal from well destruction and other activities will be prepared and submitted to the <br />SJCEHD and CVRWQCB. The report will be in a format acceptable to the SJCEHD and <br />the CVRWQCB and will be reviewed and signed by a California Professional Geologist.