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File No 94342-S&G Page 4 <br /> pound hammer with a free fall of 30 inches was utilized to drive the sampler into the <br /> ground Samples were retained within the brass liners inside the split spoon sampler A soil <br /> filled liner from each sampled interval was removed from the spoon, wrapped in foil, sealed <br /> with plastic caps, then placed on ice for transport (under chain-of-custody documentation) <br /> to a certified laboratory Prior to drilling, all drilling equipment was steam cleaned and all <br /> brass liners and sampling equipment was thoroughly washed in Alconox solution and rinsed <br /> with deionized water to minimize the contamination of the borings Drill cuttings are <br /> stockpiled at the site and covered with plastic This material shall be properly disposed of <br /> at an appropriate disposal site after the results of the laboratory analyses are known <br /> 2 1 WELL CONSTRUCTION <br /> Three of the borings, borings B-1, B-2, and B-4 were converted to groundwater monitoring <br /> wells To accomplish this, a flush-threaded schedule 40, 2 inch diameter, slotted and blank <br /> PVC casing was placed in the bore holes The lower 10 feet of the well consisted of slotted <br /> casing, with a screw-on plug at the bottom The upper part of the well is formed with a <br /> solid casing Prior to installation, all casings were thoroughly steam cleaned to minimize the <br /> chance of contamination of the boring A well pack, consisting of number 3 sand, was <br /> placed between the boring walls and the PVC casing to a point 2 feet above the uppermost <br /> slots in the casing A bentonite seal was installed on top of the sand pack, and neat cement <br />' was then used to fill the annular space from above the bentonite seal to the ground surface <br /> The top of the well is set in a christy box, at the ground surface, with an internally fitted <br /> PVC locking cover, to provide security Details of the monitoring well construction is shown <br /> in Appendix "A" <br /> 2 2 WELL DEVELOPMENT AND WATER SAMPLING <br /> The subject monitoring well was bailed until approximately ten well volumes of water had <br /> been removed from the well <br /> A clean teflon bailer was utilized to develop and collect the groundwater samples. A new <br /> length of nylon cord was utilized prior to development of each well The bailer was <br /> ADVANCE SOIL TECHNOLOGY INC <br />