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w- <br /> borings will be backfilled with a neat cement/5% bentonite or <br /> a nine-sack sand cement slurry. Soil borings that encounter <br /> groundwater will be abandoned by first placing a one-foot <br /> layer of bentonite at the bottom of the boring, and back- <br /> filling as stated above. <br /> If a deeper aquifer is to be investigated, conductor <br /> casing will first be grouted into place to seal off the upper <br /> aquifer(s) , in series if necessary, and drilling will proceed <br /> through the conductor casing after the grout has been allowed <br /> to set properly. If evidence of contamination is noted <br /> during drilling, the drilling will be halted until the <br /> responsible professional determines whether or not deeper <br /> drilling is advisable. <br /> Upon termination, borings into the saturated zone will <br /> either be completed as monitoring or extraction/injection <br /> wells, or backfilled with bentonite/cement or cement slurry <br /> as described above. Soil borings g greater than ten feet in <br /> depth will be backfilled by means of a tremie. All borings <br /> for wells will be of a diameter at least 4 inches greater <br /> than the inside diameter of the well casing to be used. <br /> The cuttings from the drilling operation will be <br /> contained in plastic 55-gallon drums and stored on-site for <br /> later treatment and/or disposal. The treatment/disposal will <br /> remain the responsibility of the client, unless other <br /> arrangements have been made. It is intended that the <br /> cuttings be incorporated into the soil treatment: program and <br /> - abandoned in place after treatment. <br /> i ' <br /> PAGE 2 <br />