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an appropriate method for disposition of the cuttings based on the analyti- <br /> cal results. The client is responsible for disposal of the drill cuttings. <br /> Soil samples for chemical analysis were collected in brass or stainless <br /> steel liners, sealed with Teflon® tape and plastic end caps, labeled, placed <br /> on ice, and delivered to a state-certified analytical laboratory, along with <br /> the appropriate chain-of-custody documentation. The bottom soil samples <br /> from each of the shallow wells were chosen for analysis. <br /> Monitoring Well installation <br /> Monitoring wells were completed by installing 2-inch-diameter, sched- <br /> ule 40 polyvinyl chloride (PVC) casing. The 2-inch-diameter flush-threaded <br /> casing is generally used for wells dedicated for ground-water monitoring <br /> purposes. The screened sections of casing, which were factory machine <br /> slotted, were from 60 to 74 feet in the ground-water monitoring wells. A <br /> filter pack of graded sand was placed in the annular space between the <br /> PVC casing and the borehole wall. Sand was added to the boreholes <br /> either through the hollow stem of the augers or down the open borehole to <br /> provide a uniform filter pack around the casing. The sand pack was placed <br /> • to a maximum of 2 feet above the screens followed by a minimum 1-foot <br /> seal consisting of bentonite pellets. <br /> Cement grout containing 5 percent bentonite was placed above the ben- <br /> tonite seal to the ground surface. A locking monument was installed over <br /> each monitoring well and a watertight cap was installed over the top of <br /> each well casing. Reference elevations for each monitoring well will be <br /> surveyed by either EMCON or by a subcontractor to the nearest 0.01 foot <br /> relative to mean sea level or a site datum. <br /> pjg1g051g05o101d A - 2 Rev. 0 July 2, 1991 <br />