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{ <br /> 22 March 2010 <br /> AGE-NC Project No. 00-0697 <br /> Page 2 of 2 " <br /> the drill rig hoist. Thereafter,the well casing void space was backfilled utilizing Portland type 11 <br /> grout (a ratio of three gallons water for every 50-pound sack of Portland cement was utilized:in <br /> preparation of the grout mixture). Each well was completely backfilled to surface grade with the <br /> Portland cement grout mixture. <br /> Monitoring wells MW-3 and MW4 were over-drilled to total depths-of 25 feet bsg using a CME-75 <br />'r HT hollow stem auger drill rig equipped with 8-inch diameter hollow stem augers.All original well <br /> construction materials were removed(including well casing, screen, filter pack,and annular seal) <br /> to ensure that no residual contamination was sealed within the abandoned borehole..The remaining <br /> borehole was then backfilled to surface grade with the Portland cement grout mixture_ <br /> Monitoring well MW-6 was fitted with a pressure tight adapter connected to a hose extending from <br /> the grout mixer.. The grout mixture was pumped into the well casing for five minutes under <br /> approximately 5-10 pounds per square inch(psi)of pressure. The well box was then removed and <br /> the well was over-drilled to five feet bsg.using a CME-75 HT hollow stem-auger drill rig equipped; <br /> with 8-inch diameter hollow stem augers.The top five feet of the well casing was then removed-arid <br /> the boring was grouted to the near surface using the portland cement grout mixture. <br /> The above referenced well construction materials,soil cuttings;and rinseate were hauled off-site for <br /> F disposal at Chemical Waste Management,Kettleman City,CA.;a copy of the non-hazardous waste <br /> manifest is included in Appendix B.if you have any questions or require further information;please <br /> contact our office at(209)467-1006. <br /> i <br /> Sincerely, <br /> Advanced GeoEnvironmental,Inc. <br />'r <br /> rsai cfo <br /> E • W t,Ww�JI�T,. . . * No.7473 <br /> Brian Millman William R. Little, <br /> Senior Project Geologist Senior Project Geologist . <br /> California Professional Geologist No. 8574 California Professional Geolo . 7473 <br /> Enclosures <br /> cc: Mr. Charlie Jacobs,Terminous Market <br /> Mr. James Barton,Central Valley.Regional,Water Quality Control Board <br /> E .ldWaced GeoEnviroomenfal,Inc. <br /> f . <br /> i <br /> 1 <br /> r <br />