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eNplored section at the site consisted of stiff clay and silt with 2-4 foot thick layers of tine <br /> . to medium sand at approximately 20, 55, 60, and 78 feet bgs <br /> The groundvvater in the vicinity of the site is unconfined Groundwater elevation at the <br /> 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, 5122101 <br /> WEGE and Pittman Well Purging (PWP) collected quarterly groundwater samples from <br /> the three monitor wells at the site on May 22, 2001 See Appendix A for QA/QC, details, <br /> methods, procedures, abbreviations, and acronyms used in sampling and analysis See <br /> Appendix B for copies of the field data sheets <br /> DEPTH TO WATER NJEASUREMENTS <br /> WEGE measured depth to water in all three wells on May 22, 2001 The measurements <br /> were made from the surveyed elevation datum at the top of casing at each well using an <br /> electrical air/water interface probe (Table 1) No free product or product sheen was <br /> observed in any of the monitor wells <br /> COLLECTION AND CERTIFLED ANALYSIS OF GROUNDWATER SAMPLES <br /> Following depth to water measurements, PWP purged approximately three well volumes <br /> of water from each well using a truck mounted vacuum lift pump and dedicated one inch <br /> diameter PVC tubing The volume of water purged from each well is noted on the field <br /> data sheets (see Appendix B) <br /> After purging, the wells were allowed to recover to at least 80% of their original well <br /> volumes A groundwater sample was then collected from each well with a disposable <br /> polyethylene bailer and decanted with no head space into four 40 nil VOA vials. <br /> containing 0 5 ml HCL acid as a preservative <br /> The samples were delivered with accompanying chain of custody docurnentation to Kiff <br /> Analytical Laboratories (DHS Certification 42236) The certified laboratory analyzed the <br /> groundwater samples from each monitor well for concentrations of TPH-G and BTEX <br /> and MTBE using EPA method 8260B <br /> DISPOSITION OF WASTEWATER <br /> The 43 gallons of wastewater that were generated from purging of the monitor wells were <br /> temporarily contained on-site in a labeled 55 gallon dot approved drum <br /> 2 Arc Pump QM 4-6, 2001 <br />