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15 March 2001 <br /> AGE-NC Project No. 98-0448 <br /> Page 2 of 2 <br /> In preparation for well abandonment of EW-1, all material within the original borehole, including the well <br /> casing, filter pack, annular seal, and well cover box will be excavated (over-drilled)utilizing a mobile drill <br /> rig and 15-inch diameter hollow stem augers. Soil cuttings generated during over-drilling activities will be <br /> placed on plastic sheeting and covered in a west section of the site.Rinseate will be containerized in properly <br /> labeled D.O.T.-approved 55-gallon drums, and stored on-site in an area lacking public access. <br /> Following over-drilling activities of EW-1,the borehole will be backfilled with a cement grout mixture to <br /> surface grade.The grout mixture will consist of a nominal six gallon to 94-pound sack portland cement ratio. <br /> The grout mixture will be deployed utilizing the hollow stem augers as a tremie pipe. Based on backfilling <br /> a 15-inch diameter borehole, the volume of portland cement ground mix can be calculated utilizing the <br /> following equation for a cylinder: <br /> V=nr'h <br /> where V is the volume,r is the radius and h is equal to the height of the borehole, therefore <br /> V=n(0.625')(45 ft)=55.22 ft <br /> One cubic foot is equivalent to 7.48 gallons,therefore <br /> 55.23 ft' • 7.48 gal./ft'=413 gallons <br /> AGE anticipates an estimated 413 gallons of portland cement grout mix should be utilized to backfill the <br /> borehole. <br /> Sincerely, <br /> Advanced GeoEnvironmental, Inc. <br /> a� <br /> Timothy V C6611ar <br /> Project Geologist <br /> Enclosures <br /> cc: Mr. Bob Long, Sierra Lumber <br /> Mr. Marty Hartzell, California Regional Water Quality Control Board-Central Valley Region <br /> Advanced GeoEnvironmental Inc. <br />