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The groundwater in the vicinity of the site is unconfined Groundwater elevation at the isite 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, 12/2/99 WEGE and Pittman Well Purging (PWP) personnel collected quarterly groundwater samples from the five monitor wells at the site on December 2, 1999 See Appendix A for QA/QC, details, methods, procedures, abbreviations, and acronyms used in sampling and analysis DEPTH TO WATER MEASUREMENTS Depth to "ater was measured at all wells on December 2, 1999 The measurements were 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 Atter 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 The samples were delivered with accompanying chain of custody documentation to North State Environmental Laboratories (NSE) The certified laboratory (DHS 41753) analyzed the water samples from 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 approximately 50 gallons of wastewater that was purged from the monitor wells was contained on-site in labeled 55 gallon DOT approved drums 2 Sanchez QM 10-12 1999