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07 November 2013 <br /> AGE Project No. 01-0887 <br /> Page 2 of 3 <br /> • Monitoring wells MW-6 jMW-/r, MW-8, MW-9, MW-11: 25 feet bsg; and <br /> • Monitoring well MWA 0: 20 feet bsg; <br /> Utilizing historical soil and groundwater analytical data (Tables 1 and 2) and based on the <br /> shallow installation depths of the wells installed at the site, AGE proposes to destroy all <br /> wells using over-drilling techniques. <br /> All site wells will be destroyed in accordance with San Joaquin County Environmental <br /> Health Department (SJCEHD), Standards for Well Construction & Destruction in San <br /> Joaquin County, dated February 2005 and in accordance with California Well Standards <br /> Bulletins 74-81 and 74-90. <br /> PROCEDURES <br /> As required, a health and safety plan will be prepared in accordance with Occupational <br /> Safety and Health Guidance Manual for Hazardous Waste Site Activities(National Institute <br /> for Occupational Safety and Health Administration, U.S. Coast Guard and U.S. <br /> Environmental Protection Agency, 1985). Prior to drilling activities, each proposed location <br /> will be clearly marked and an utility clearance will be obtained through Underground <br /> Service Alert. <br /> The required well destruction permit will be obtained from the SJCEHD prior to destruction <br /> activities. Before commencement of drilling, all wells will be checked for total depth and <br /> integrity using a Solinst water level meter. Any obstructions found in the well will be <br /> removed. <br /> Site wells MWA through MWA 1 are proposed to be drilled-out to one foot deeper thin <br /> their installed total depths utilizing 8.25/inch. Wells MWA through MW-4 will be drilled to <br /> 20 feet bsg, well MW-5 to 56 feet bsg, wells MW-6 through MW-9 and MWA 1 to 26 feet <br /> bsg and well MWA 0 to 21 feet bsg.,All original well construction materials will be removed <br /> (including well casing, screen, filter pack, and annular seal) to ensure that no residual <br /> contamination is sealed within the abandoned borehole. Remaining boreholes will be <br /> backfilled to surface grade with neat cement and covered with concrete asphalt,depending <br /> on the surrounding surface material. <br /> Rinseate and soil generated during drilling and decontamination activities will be <br /> containerized in properly labeled Department of Transportation (D.O.T.)-approved <br /> 55-gallon drums and stored on-site until proper disposal is arranged to a suitable <br /> Advanced GeoEnviron mental,Inc. <br />