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photoionization detector (PID) The soil will be placed in a glass far, sealed, and placed in a <br /> warm atmosphere After approximately 15 minutes, which is generally sufficient for volatiles to <br /> cscape from the soil, the PID probe will be inserted into the glass far The total volatile <br /> hydrocarbons present are detected by the PID and reported in parts per million (ppm) The PID <br /> will be calibrated to an isobutylene standard <br /> Generally two soil samples from each soil boring will be submitted for chemical analysis Soil <br /> samples selected for analysis typically represent the highest PID reading recorded for each soil <br /> boring and the sample dust above Hirst-encountered groundwater <br /> AS and SVE Well Installation <br /> Air Sparge and soil vapor extraction wells will be completed by installing 2 inch-diameter <br /> Schedule 40 polyvinyl chloride (PVC) casing The 2-inch-diameter flush-threaded casing is <br /> generally used for wells dedicated for groundwater monitoring purposes The screened sections <br /> of casing are factory machine slotted Air sparge wells will be constructed using 2-foot screen <br /> lengths installed at approximately 48 to SO feet bgs The SVE well will be dual completion with <br /> one well completed in the former UST excavation backfill and one well completed in native soil <br /> beneath the former UST complex A filter pack of graded sand will be placed in the annular <br /> space between the PVC casing and the borehole wall Sand will be added to the borehole through <br /> the hollow stem of the augers to provide a uniform filter pack around the casing and to stabilize <br /> the borehole The sand pack will be placed to a maximum of 2 feet above the screens followed by <br /> a minimum 1-foot seal consisting of bentonite pellets <br /> Cement grout containing 5 percent bentonite or concrete will 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(s) A watertight locking cap will be installed over the top of the well casing Reference <br /> elevations for each monitoring well will be surveyed when more than two wells will be located <br /> on site Monitoring well elevations will be surveyed by Pinnacle or a subcontractor to the nearest <br /> 0 01 foot relative to mean sea level (MSL) or a site datum <br /> SACW 1548ON DOG46Vntt 1 A-2 Pinnacle <br />