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The groundwater in the vicinity of the site is unconfined Groundwater elevation at tine site varies from a wet year high of 7 feet bgs to about 35-40 feet bgs during the previous drought period Groundwater flow direction at the site has generally been to the west since December 1997 QUARTERLY GROUNDWATER MONITORING, 618/00 WEGE and Pittman Well Purging (PWP) personnel collected quarterly groundwater samples from the five monitor wells at the site on June 8, 2000 See Appendix A for QA/QC, details, methods, procedures, abbreviations, and acronyms used in sampling and analysis DEPTH TO WATER MEASUREMENTS Depth to water was measured at all wells on June 8, 2000 The measurements wei e made from the surveyed elevation 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 and PWP personnel used a truck mounted vacuum lift pump and dedicated one inch diameter PVC tubing to purge each well of three volumes of water After purging, the wells were allowed to recover to at least 80% of their original well volumes A groundwater sample was then collected from each well with a polyethylene bailer and decanted with no headspace into two 40 ml VOA vials containing 0 5 ml HCL acid as a preservative "I he samples were delivered with accompanying chain of custody documentation to North State Environmental Laboratories (NSE) The certified laboratory (DHS 91753) analyzed the water samples fiom each monitor well for concentrations of TPH-G using EPA method 8015 modified and BTEX and MTBE using EPA method 8020 DISPOSITION OF WASTEWATER The 67 gallons of wastewater that were purged from the monitor wells were temporarily contained on-site in labeled 55 gallon DOT approved drums • 2 Sanchez QM 4-6, 2000