Laserfiche WebLink
explored section at the site consisted of light brown silty clay with lenses of sandy clays <br /> and silts <br /> The groundwater in the vicinity of the site is unconfined Groundwater elevation at the <br /> site vanes 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 1217198 <br /> WEGE and Lawrence Tank Testing (LTT) collected quarterly groundwater samples from <br /> the three monitor wells at the site on December 7, 1998 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 December 7, 1998 The measurements <br /> were 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, Lawrence Tank Testing (LTT) purged three <br /> well volumes of water from each well using a truck mounted vacuum lift pump and <br /> dedicated one inch diameter PVC tubing The purged wastewater was temporarily <br /> contained on-site in labeled 55 gallon DOT approved drums Evergreen Environmental <br /> Services transported this wastewater to their recycling center under a non-hazardous <br /> manifest on January 5, 1999 (see Appendix 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 41753) The certified laboratory <br /> analyzed the water samples from each morutor 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, DIPE, 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 December 7, 1998 <br /> 2 Arc Pump QM 10-12 1998 <br />