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screen). Ms. Diane Hinson of the County was present during the closure operation and allowed the ten <br /> foot portion of the casing to remain in the borehole and to be grouted in place. <br /> Ten-inch diameter hollow-stem auger was advanced down through the entire length of the monitor well <br /> and into at least one foot of native soil. In Monitor Well MW-4, the auger was advanced downward <br /> while keeping the ten (10) foot portion of the well casing that remained in the borehole inside the auger. <br /> Cuttings from Monitor Wells MW92-1 and MW92-2 included grout seal material and filter pack material <br /> (clean sand). Cuttings from Monitor Wells MW-3 and MW-4 included pea gravel (apparently used for <br /> the filter pack) and did not contain any grout seal material. The drill cuttings were stockpiled at the site <br /> for later spreading by LOF. <br /> Following the drilling out of all four monitor wells as described, the boreholes were backfilled with neat <br /> cement. Condor originally proposed tremie grouting the boreholes. Ms. Hinson approved pouring the <br /> neat cement into the boreholes after noting that the boreholes were remaining competent (open) because <br /> of the high clay content of the site soil. <br /> CONCLUSIONS <br /> The monitor wells were closed as described in the closure application, with field modifications approved <br /> by Ms. Diane Hinson (County). LOF and Condor understand that closure of the AST site is now <br /> complete. <br /> CERTIFICATION <br /> Condor prepared this Monitor Well Closure Report as requested by LOF. Please contact Mr. Jon Weiss <br /> at (209) 858-6202 with any questions or comments. <br /> Respectfully, oQ�pF ESS/p y9 <br /> Condor Earth Technologies, Inc. Reviewed by: e� d ti�F2G <br /> ¢ o z <br /> 0.515 <br /> C � <br /> Exp.030/98 <br /> cPI,9r CIVIL ��P <br /> Donald F. Kresse Robert J. Job, P FOFCAtIF00 <br /> Staff Geologist Managing Civil Engineer <br /> Attachment <br /> L� CONDOR <br />