Laserfiche WebLink
I <br /> 1 <br />' 14 February 2003 <br /> • <br /> AGE-NC Project No 98-0497 <br />' Page 3 of 4 <br />' 3 2 ANALYTICAL RESULTS FROM GROUND WATER SAMPLES <br /> The analytical results from the 27 December 2002 ground water sampling event are as follows <br />' • TPH- and TPH-d were detected in well MW-1 at concentration of 450 micrograms per liter <br /> g � <br />' (µg/1)and 36,000 gg/l,respectively The laboratory report noted that strongly-aged gasoline <br /> or diesel compounds were significant <br /> • BTEX compounds were not detected in the five ground water samples analyzed Lg <br />' • Fuel additives were not detected in the rive ground water samples analyzed �� IG' d 1F� <br /> 54 L <br /> Laboratory results of water samples analyzed for petroleum hydrocarbons are summarized in <br /> Table 2 Copies of the laboratory reports for the quarterly monitoring event (MAI Lab IDs <br /> 0212472-001 through 0212472-005),QA/QC reports and chain-of-custody form are in Appendix B <br /> 1 <br />' 4 0. SUMMARY AND CONCLUSIONS <br /> The findings of the 27 December 2002 ground water monitoring event include the following <br /> vin <br /> • Measured ground water elevation was approximately 40 feet below MSL, and was within <br />' the screened interval of each monitoring well Ground - ater flow direction near the former <br /> UST location was to the southeast with an average gradient of 0 001 foot/foot Historically, <br />' flow direction at the site has been toward the east or has had no observable gradient <br /> • Contamination by TPH-g and TPH-d was encountered in the ground water sample collected <br />' and analyzed from MW-1 Concentrations of TPH-g appeared to have stabilized since the <br /> March 2001 monitoring event The detected concentrations of TPH-d in samples collected <br /> from MW-1 have fluctuated significantly during the past four monitoring events, pnor to <br />' March 2002,the TPH-d concentrations in well MW-1 had exhibit an overall declining trend <br /> TPH-g and TPH-d were not detected in wells MW-2 through MW-5 <br />' BTEX compounds and fuel additives were not detected in any of the ground water samples <br /> analyzed <br /> • The hydrocarbon-impacted groundwater plume appears to be limited to the area immediately <br />' <br /> -surrounding MW-1 The inferred areal_extent of hydrocarbon-impacted ground water is - <br /> illustrated in Figure 4 <br /> 1 <br />' Advanced GeoEnvironmental,Inc <br />