Laserfiche WebLink
1 <br /> 17 July 2001 <br /> 16 <br /> AGE-NC Project No 98-0497 <br />' Page 3 of 4 <br /> The ground water gradient for the May 2001 monitoring event was inferred to be 0 002 feet/feet with <br /> a flow direction toward the east-northeast <br />' 3 2 ANALYTICAL RESULTS FROM GROUND WATER SAMPLES <br /> The analytical results from the 31 May 2001 ground water sampling event are as follows <br /> • TPH-g was detected in MW-1 at a concentration of 490 micrograms per liter (gg/l) No <br /> BTEX compounds were detected in the ground water samples analyzed <br /> • TPH-d was detected at a concentration 21,000 �ig/l in the sample from well MW-1 <br /> tFuel oxygenates, EDB and 1,2-DCA were not detected in the three ground water samples <br /> collected The laboratory report notes the presence of a sheen in the sample from MW-1 <br />' Laboratory results of water samples analyzed for petroleum hydrocarbons are summarized in <br /> Tables 2 and 3 Copies of the laboratory reports for the quarterly monitoring event (MAI Lab IDs <br /> 68792 through 68794), QA/QC reports and cham-of=custody form are in Appendix B <br /> 4.0. SUMMARY AND CONCLUSIONS <br />' The findings of the 31 May 2001 ground water monitoring event include the following <br /> • Contamination by TPH-g and TPH-d was encountered in groundwater samples collected and <br />' analyzed from MW-1 Concentrations of TPH-g and TPH-d were significantly lower than <br /> encountered during the previous monitoring event Detected concentrations of TPH-g and <br /> TPH-d have consistently decreased since monitoring began in August 2000 <br /> • MTBE and other fuel additives were not detected in samples collected from the ground water <br /> monitoring network Fuel additives have not been detected in ground water samples since <br />' monitoring began in August 2000 <br /> • Measured ground water elevation is approximately 33 0 feet below msl, and was within the <br /> screened interval of each monitoring well Ground water flow direction was toward the east <br /> northeast with a gradient of 0 002 feet/feet Historically, flow direction at the site has been <br /> toward the east or has had no observable gradient <br />' • The east and west limits of the petroleum hydrocarbon-impacted ground water plume have <br /> not been delineated The north and south limits of the plume appear to be defined, samples <br /> Advanced GeoEnvironmental,Inc <br />