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