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Generally two to three soil samples from each soil boring will be submitted for chemical <br /> analysis. Soil samples selected for analysis typically represent the highest PID, the sample just, <br /> above first-encountered groundwater and the base of the boring. <br /> Monitoring Well Installation <br /> On-site monitoring wells MW-1, MW-2, and MW-3 will be completed by installing 4 <br /> inch-diameter Schedule 40 polyvinyl chloride (PVC) casing. The 4-inch-diameter flush-threaded <br /> casing is generally used for wells dedicated for groundwater monitoring purposes. The screened <br /> sections of casing are factory machine slatted PVC casing. Screen intervals will be placed with <br /> approximately 1S feet of screen below first encountered groundwater. A filter pack of graded <br /> sand will be placed in the annular space between the PVC casing and the borehole wall. Sand <br /> will be added to the borehole through the hollow stem of the augers to provide a uniform filter <br /> pack around the'casing and to stabilize the borehole. The"sand pack will be placed to a maximum <br /> of 2 feet above the screens followed by a minimum 2-foot seal consisting of bentonite pellets. <br /> Cement grout containing 5 percent bentonite or conerete`vill be placed above the bentonite seal <br /> to the ground surface. A concrete traffic-rated vault box will.be installed over the monitoring <br /> well. A watertight locking cap will be installed over :the top of the well casing:. Reference <br /> elevations for each monitoring well will be surveyed wiien more than two wells are located on <br /> site. Monitoring well elevation will be surveyed by a licensed surveyor to the nearest 0.01 foot <br /> relative to mean sea level (MSL). ' <br /> I . <br /> ' I <br /> i <br /> 1! <br /> it <br /> j sac1N:ICamPk\Data\Archive\Arco\5469\Ri eports\5469p103,doe-95Vsg:1 I`r Corporation <br /> A-2 oz/as/ou <br /> I <br />