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documentation Sall samples selected for chemical analysis were determined from a <br /> head-space analysis using a hand-held photoionization detector (PID) The soil was <br /> placed in a plastic zip-lock baggy, sealed, and placed in a warm atmosphere After <br /> approximately 15 minutes, which is generally sufficient for volatiles to escape from the <br /> soil, the PID probe was inserted into the plastic baggy The total volatile hydrocarbons <br /> present were detected by the PID and reported in parts per million (ppm) The PID was <br /> calibrated to an isobutylene standard <br /> Four soil samples from each soil boring were submitted for chemical analysis Sol] <br /> samples selected for analysis typically represented the highest PID reading recorded for <br /> each soil boring and the sample dust above first-encountered groundwater <br /> Monitoring Well Installation <br /> Monitoring wells were completed by installing 2-inch-diameter Schedule 40 polyvinyl <br /> chloride (PVC) casing The 2-inch-diameter flush-threaded casing is generally used for <br /> wells dedicated for groundwater monitoring purposes The screened sections of casing are <br /> factory machine slotted and were installed completely below first-encountered water <br /> level A filter pack of graded sand was placed in the annular space between the PVC <br /> casing and the borehole wall Sand was added to the borehole through the hollow stem of <br /> the augers to provide a uniform filter pack around the casing and to stabilize the borehole <br /> The sand pack was placed to 2 feet above the screens followed by a 3-foot seal consisting <br /> of bentonite pellets <br /> Cement grout containing 5 percent bentonite or concrete was placed above the bentonite <br /> seal to the ground surface A concrete traffic-rated vault box was installed over the <br /> monitoring wells A watertight locking cap were installed over the top of the well casing <br /> I <br /> CP1E 1APACHEIREPORTSIAPACP102 DOC-98l1sg 1 sEmcon <br />