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The groundwater 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 generally been to the east <br /> ,QUARTERLY GROUNDWATER MONITORING, 3/3/99 <br /> WEGE and Pittman Well Purging (PWP) collected quarterly groundwater samples from <br /> the three monitor wells at the site on March 3, 1999 See Appendix A for QA/QC, <br /> details, methods, procedures, abbreviations, and acronyms used in sampling and analysis <br /> See Appendix B for copies of the field data sheets <br /> DEPTH TO WATER MEASUREMENTS <br /> WEGE measured depth to water in all wells on March 3, 1999 The measurements were <br /> 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 CERTIFIED ANALYSIS OF GROUNDWATER SAMPLES <br /> Following depth to water measurements, PWP purged three well volumes of water from <br /> each well using a truck mounted vacuum lift pump and dedicated one inch diameter PVC <br /> tubing The purged wastewater was temporarily contained on-site in labeled 55 gallon <br /> DOT approved drums Evergreen Environmental Services transported this wastewater to <br /> their recycling center under a non-hazardous manifest on April 23, 1999 (see Appendix <br /> C) <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 two 40 ml VOA vials <br /> containing 0 5 ml HCL acid as a preservative <br /> The samples were delivered with accompanying chain of custody documentation to North <br /> State Environmental Laboratories (DHS Certification #1753) The certified laboratory <br /> analyzed the water samples from each monitor well for concentrations of TPH-G and <br /> BTEX In addition the three water samples were analyzed for concentrations of the five <br /> oxygenants MTBE, TBA, DIPS, ETBE, TAME using EPA method 8260 <br /> GROUNDWATER GRADIENT AND FLOW DIRECTION <br /> Figure 4 shows the groundwater elevation gradient and flow direction determined from <br /> depth to water measurements at the three on-site monitor wells on March 3, 1999 The <br /> groundwater elevation has increased by an average of 0 72 feet at the three monitor wells <br /> 2 Arc Pump QM 1-3 1999 <br />