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documentation Soil samples selected for chemical analysis were determined from a head-space analysis using a hand-held photoionization detector (PID) The soil was placed in a zip-lock bag, sealed, and placed in a warm atmosphere After approximately 15 minutes, which is generally sufficient for volatiles to escape from the soil, the PID probe was inserted into the bag The total volatile hydrocarbons present are detected by the PID and reported in parts per million (ppm) The PID was calibrated to an isobutylene standard Three soil samples from each soil boring were submitted for chemical analysis Soil samples selected for analysis typically represent the highest PID reading recorded for each soil boring and the sample dust above first-encountered groundwater, and the sample from the base of each boring Air Sparge Well Installation Air Sparge wells were completed by installing 2-inch-diameter Schedule 40 polyvinyl chloride (PVC) casing The 2-inch-diameter flush-threaded casing is generally used for wells dedicated for air sparge purposes The screened sections of casing are factory machine slotted with 0 02 inch slots and 2 foot intervals were installed for air sparge wells A filter pack of graded sand was placed in the annular space between the PVC • casing and the borehole wall Sand was added to the borehole through the hollow stem of the augers to provide a uniform filter pack around the casing and to stabilize the borehole The sand pack was placed at 2 feet above the screens followed by a minimum 1-foot seal consisting of bentonite pellets Cement grout containing 5 percent bentonite or concrete was placed above the bentonite seal to the ground surface A concrete traffic-rated vault box was installed over the air sparge well(s) A watertight locking cap was installed over the top of the well casing Well detail information is presented in Appendix B Vapor Extraction Well Installation One dual completion vapor extraction well was completed by installing two-2 inch diameter Schedule 40 polyvinyl chloride (PVC) casings The screened sections of casing are factory machine slotted with 0 02 inch slots at a 10 foot (VW-5S) or 15 foot (VW-5D) interval for the dual completion vapor extraction well A filter pack of graded sand was placed in the annular space between the PVC casing and the borehole wall Sand was added to the borehole through the hollow stem of the auger to provide a uniform filter pack around the casing and to stabilize the borehole The sand pack was placed at 1 foot above the top of the screen of the deeper well (VW-5D) followed by three feet of CP T\ARC0\05481REP0RTS10548P201 DOC-99\tsg i Puma& A-2