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..~ ~-. ,~~~ ~,•urii rrcwi ur uun^ txplorat ron TO 7219298 P. 08 <br />encountered. At this point a 6' threaded and coupled scheduled 40 <br />P_V.C. casing was placed into the boring. The threaded and coupled <br />casing was use because of the potential of Methane Gas in the trash. <br />The State Health Department required that the steel casing be <br />placed no deeper than 2' into the existirig soils so that it could determine <br />the water in the upper soils. Alter the hole was drilled exactly 2' into the <br />soils the casing was grouted-into Place using Portland cement with 5% <br />Bentonite_ The grout was placed by using the 6" steel casing as a <br />trimmie pipe pumping the grout through the center and back <br />up the outside of the casing. As the grout was being placed the hollow <br />stem were removed. After the grout had sufficient time to harden 9 <br />{which was 48 hours) we drilled the grout out of the center of the steel <br />casing and began to continuous soil sampling from the bottom of the <br />conductor pipe to 15' below the bottom of the trash envelope. A 2' <br />stainless steel well was placed at this point. Do to the care in which <br />Ground Exploration Company, Inc. during construction of these wells the <br />State Health Department and the Consultant determined that the water <br />that was deeper in the soils were not being influenced from any waters <br />that could have been it in the trash envelope, therefore saving the owner <br />a extensive cleanup and de-watering of the trash envelope. <br />Wood Treating Facility on 68th 8 Galapagos <br />Ground Exploration Company, Inc. has worked at this site since 1989. <br />This site was a wood treating facility from the late 1940" until it burned <br />down in the mid 1980's. The process which the owner used leaked large <br />amounts of Cresol and other amtaminates into the groundwater. The <br />upper groundwater was totally saturated as was the upper bedrock. <br />One of the difficulties of this site was to place conductor casings to <br />different depths to determine the extent in which the contaminates had <br />migrated downwards. Some of the contaminates were heavier than <br />water and had a tendency to sink to the lowest area that they coukf. The <br />Arapahoe and Denver Formation in this area had numerous sand and <br />fractured zones, which let the contamination travel deeper into the <br />bedrock- Ground Exploration Company, Inc. placed wells using <br />