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19 February 2009 <br /> AGE-NC Project No. 99-0637 <br /> Page 2 of 2 <br /> Prior to commencement of well destruction activities each well casing was sounded with a Solinst <br /> water level meter to ensure that no obstructions were present in the casings.Each well head was then <br /> fitted with a pressure tight adapter connected to a hose extending from the grout mixer. A ratio of <br /> six gallons water for every 94-pound sack ofportland cement was utilized in preparation of the grout <br /> mixture.The grout mixture was pumped into each well casing for 5-10 minutes under approximately <br /> 10-15 pounds per square inch (psi) of pressure. The well boxes were then removed and the wells <br /> were over-drilled to three feet bsg using a CME-75 hollow stem auger drill rig equipped with an <br /> oversized 24-inch diameter drill bit attached to 8-inch diameter hollow stem augers. The top 2.5 feet <br /> of the well casings were then removed and the borings 7 ere grouted to the near surface using the <br /> Portland cement grout mixture.Borings for all wells were completely backfilled to 0.5 feet bsg with <br /> neat cement and then to surface grade with concrete. <br /> If you have any questions or require further information,please contact our office at(209)467-1006. <br /> Sincerely, <br /> �514NAL G,,o <br /> Advanced GeoEnvironmental, I �� W• M� <o <br /> m y <br /> No.8574 <br /> f3fi5__.% �. <br /> Brian W. Millman T� oFF cAL�FaP� <br /> Senior Project Geologist <br /> California Professional Geologist No. 8574 <br /> Enclosures <br /> cc: Mr. Frederic Clark, City of Manteca <br /> Mr. James Barton, CVRWQCB <br /> Advanced GeoEnvironmental,Inc. <br />