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The groundwater in the vicinity of the site is unconfined Groundwater elevation at the <br /> site ,aries from a wet year high of 7 feet bgs to about 35-40 feet bgs during the previous <br /> drought period Groundwater flow direction at the site has generally been to the west <br /> since December 1997 <br /> QUARTERLY GROUNDWATER MONITORING, 2123/00 <br /> WEGE and Pittman Well Purging (PWP) personnel collected quarterly groundwate-r <br /> samples from the five monitor wells at the site on February 23, 2000 See Appendix A <br /> for QA/QC, details, methods, procedures, abbreviations, and acronyms used in sampling <br /> and analysis <br /> DEPTH TO WATER MEASUREMENTS <br /> Depth to water was measured at all wells on February 23, 2000 The measurements were <br /> made from the surveyed elevation at the top of casing at each well using an electrical <br /> air/water interface probe (Table 1) No free product or product sheen was observed in <br /> any of the monitor wells <br /> COLLECTION AND CERTIFIED ANALYSIS OF GROUNDWATER SAMPLES <br /> Following depth to water measurements, WEGE and PWP personnel used a truck <br /> mounted vacuum lift pump and dedicated one inch diameter PVC tubing to purge each <br /> well of three volumes of water <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 polyethylene <br /> bailer and decanted with no headspace into trio 40 ml VOA vials containing 0 5 nil HCL <br /> acid as a preservative <br /> The samples were delivered with accompanying chain of custody documentation to North <br /> State Environmental Laboratories (NSE) The certified laboratory (DHS 41753) <br /> analyzed the water samples from each monitor well for concentrations of TPH-G using <br /> EPA method 8015 modified and BTEX and MTBE using EPA method 8020 <br /> DISPOSITION OF WASTEWATER <br /> The 81 gallons of wastewater that were purged from the monitor wells were temporarily <br /> contained on-site in labeled 55 gallon DOT approved drums On April 11, 2000 the <br /> wastewater was transported by M P Environmental Services, Inc via a non—hazardous <br /> waste manifest to Seaport Environmental Services in Redwood City, a licensed <br /> wastewater recycler The wastewater from the previous December 2, 1999 quarterly <br /> monitoring round was transported and recycled by the same methods on February 10, <br /> 2000 See Appendix D for copies of the non-hazardous waste manifests <br /> 2 Sanchez QM 1-3 2000 <br />