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f _ 1 <br /> t <br /> kn KLEIN FELDER <br /> o The wells are screened from 5 feet above to 20 feet below first ground wafer. <br /> Every effort is made not to screen across two aquifers. Wells are not set in <br /> areas of suspected significant soil contamination. <br />` o All PVC pipe and end caps are steam cleaned prior to installation. <br /> o The annular space between the screen and the wall of the boring is backfilled <br /> with clean Lone Star Industries 0/30 Monterey sand to approximately 2 feet <br /> above the top of the perforated sections. Based on soil logs or a sieve test, <br /> modifications may be made regarding the size of sand to be used. <br /> Installation of the 0/30 sand frequently requires that the sand be tremied, <br /> using clean water. In this event, a sample of the tremie water is collected, <br /> unless the source is known to be clean. <br /> o A 3-foot bentonite plug is placed above the sand pack to provide a seal <br /> against surface water infiltration. <br /> o The remaining annular space is filled with tremied cement/bentonite grout <br /> to the surface. <br /> o The wells are secured using a locking stovepipe inside a cement utility box <br /> that is set flush to'the ground surface. If not in a traffic area, a utility box is <br /> not used and wells are extended to 3 feet above ground surface. <br /> r <br /> i <br /> I <br /> a <br /> ` 121-88-11.08 <br />