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k%j KLEiNFELDER <br /> screen sections are perforated with 0 010-inch factory-cut slots. This <br /> o Wells <br /> parameter is assessed (and modified if required) after the boring logs and, if <br /> warranted, a sieve test has been performed and the results received <br /> ' o The wells are screened from 5 feet above to 20 feet below first ground water <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 trenued, <br /> using clean water In this event, a sample of the tremae 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 /> to The remaining annular space is filled with tremied cement/bentonite grout <br /> to the surface. <br /> io 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 /> ' SURVEY <br /> The elevation of the top of the PVC casings is usually surveyed and tied into permanent <br /> markers, if readily available. Survey is to 0 1 foot for the "x" and "y" coordinates and 01 <br /> foot for the 'Y' coordinate. <br /> ' <br /> MONITORING WELL DEVELOPMENT AND SAMPLING <br /> Monitoring wells are developed after installation. Each well is first sampled with a clear <br /> acrylic bailer to visually inspect for hydrocarbon layer or sheen. If no product layer or <br /> sheen is observed on the water, the well is developed by surging and pumping. Surging <br /> ' 145-88-2013 <br />