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no- <br />Daniel J. Villanueva <br />Staff Geologist <br />William R. Little <br />Senior Project Geologist <br />California Professional Geolog <br />12 May 2010 <br />AGE-NC Project No. 06-1468 <br />Page 2 of 2 <br />Monitoring well MW-6, which was completed above surface grade with a "stove pipe" type well <br />box, was destroyed by filling the entire casing (approximately 33 feet) with portland cement. Once <br />the well was completely filled, the stove pipe and a combined five feet (3-feet of above ground and <br />2-feet below ground) of casing were removed. After removing the stove pipe the remaining exposed <br />PVC pipe was then "capped" approximately one foot above the casing. The remaining void space <br />was then filled with native materials to surface grade. <br />Monitoring well MW-7 was hand dug to approximately 2.5 feet bsg due to accessability issues <br />during abandonment activities. Following hand digging, the top two feet of well casing were <br />removed and the exposed PVC pipe was then "capped" approximately one foot above the exposed <br />casing. <br />Monitoring wells MW-1, MW-2 and MW-5, and remediation wells VW-1 through VW-3 and AW-1 <br />were destroyed by filling the entire length of each well's casing with portland cement. Once filled, <br />a pressure tight adapter was connected to each well and 15-25 pounds per square inch (psi) of air <br />pressure was applied to the well for ten minutes, expelling grout into formation. Following <br />pressurization, the well box was removed, and the well was over-drilled to five feet bsg using a <br />CME-75 HT hollow stem auger drill rig equipped with 8-inch diameter hollow stem augers. After <br />the top five feet of the well casing was destroyed the boring was grouted to the near surface using <br />the portland cement grout mixture. <br />Following well destruction activities all locations, surfaces were restored to their original conditions. <br />Non-hazardous soil and destruction material (grout chips) were spread on-site, within a vegetated <br />bio-swale and compacted. <br />If you have any questions or require further information, please contact our office at (209) 467-1006. <br />Sincerely, <br />Advanced GeoEnvironmental, Inc. <br />CC: Mr. Harlin Knoll, San Joaquin County Department of Environmental Health <br />Advanced GeoEnvironmental, Inc.