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y The groundwater in the vicinity of the site is unconfined Groundwater elevation at the site varies from a wet year high of 25 feet bgs to at least 50 feet bgs during the previous drought period Groundwater flow direction at the site has generally been to the east QUARTERLY GROUNDWATER MONITORING, 5112199 WEGE and Pittman Well Purging (PWP) collected quarterly groundwater samples from the three monitor wells at the site on May 12, 1999 See Appendix A for QA/QC, details, methods, procedures, abbreviations, and acronyms used in sampling and analysis See Appendix B for copies of the field data sheets DEPTH TO WATER MEASUREMENTS WEGE measured depth to water in all wells on May 12, 1999 The measurements were made from the surveyed elevation datum 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, PWP purged three well volumes of water from each well using a truck mounted vacuum lift pump and dedicated one inch diameter PVC tubing The purged wastewater was temporarily contained on-site in labeled 55 gallon DOT approved drums Evergreen Environmental Services transported this wastewater to their recycling facility under a non-hazardous manifest on July 13, 1999 (see Appendix C) 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 disposable polyethylene bailer and decanted with no head space into two 40 ml VOA vials containing 0 5 ml HCL acrd as a preservative The samples were delivered with accompanying chain of custody documentation to North State Environmental Laboratories (DHS Certification #1753) The certified laboratory analyzed the water samples from each morutor well for concentrations of TPH-G, BTEX and MTBE GROUNDWATER GRADIENT AND FLOW DIRECTION Figure 4 shows the groundwater elevation gradient and flow direction determined from depth to water measurements at the three on-site monitor wells on May 12, 1999 The groundwater elevation has increased by an average of 0 60 feet at the three monitor wells since the previous quarterly monitoring round on March 3, 1999 The flow direction is to the southeast The overall gradient is 0 006 feet/linear foot 2 Are Pump QM 4-6 1999