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The groundwater in the vicinity of the site is unconfined Groundwater elevation at the `10 site varies from a wet year high of 25 feet bgs to at least 50 feet bgs during the previous drought period Groundwater flow direction at the site has varied from north to south through the northeast and southeast quadrants QUARTERLY GROUNDWATER MONITORING, 9129104 WEGE collected quarterly groundwater samples from the four monitor wells at the site on September 29, 2004 See Appendix A for QA/QC, details, methods, procedures, abbreviations, and acronyms used in sampling and analysis See Appendix B for copies of the field data sheets DEPTH TO WATER MEASUREMENTS WEGE measured depth to water in all four wells on September 29, 2004 The measurements were made from the surveyed elevation datum at the top of casing at each well using an electrical air/water interface probe (Table 1) No free product or product sheen was observed in any of the monitor wells COLLECTION AND CERTIFIED ANALYSIS OF GROUNDWATER SAMPLES Following depth to water measurements, WEGE purged approximately three well . volumes of water from each monitor well using a truck mounted submersible 2" Grundfoss pump and disposable one half inch diameter PVC tubing An in-line cell equipped with a Hanna pH, temperature, and conductivity probe and meter was used to measure water quality parameters at one minute intervals during the well purging A calibrated flow meter was placed between the in-line cell and waste water tank to measure the rate and total volume of water purged from each well The volume of water purged from each well was noted on the field data sheets (see Appendix B) Purging rates were maintained at less than one gallon/minute so that drawdown in the well did not exceed 20% of the original well volume A groundwater sample was then collected by severing the PVC tubing at a point between the Grundfoss pump and in-line cell while the pump continued to run and decanting the groundwater into three 40 ml VOA vials containing 0 5 ml HCL acid as a preservative The samples were delivered with accompanying chain of custody documentation to Kiff Analytical Laboratories (DHS Certification #2236) The certified laboratory analyzed the groundwater samples from each monitor well for concentrations of TPH-G, BTEX, MTBE, ETBE, DIPE, TBA, TAME, 1,2-Dichroloethane, and I,2-Dibromoethane using EPA method 8260B 2 Arc Pump QM 7-9, 2004