ARCHIVED REPORTS XR0001660 - Laserfiche WebLink

Home Browse Search

Y 15 November 2004 ' i AGE-NC Project No 96-0235 Page 4 of 5 ' laboratory reporting limits in any of the water samples collected during,the August 2004 monitoring g Analytical results of water samples collected durlrig the thirdcarter of 20 q 04 are summarized in r Tables 2 and 3,analytical results from previous monitoring events are summarized in Tables 4 and 5 ' Figures S and 6111ustrate the gond water contamination plumes in upper and lower ground water' intervals,respectively The laboratory report(CTEL Project No CT214-0408175),chain ofcustod forms and the laboratory duality assurance/quality control y (QA/QC) reports are included in Appendix C GeoTracker confirmation pages of the submitted laboratory electronic deliverable format (EDF) files are included in Appendix D ri 4.0• SUMMARY AND CONCLUSIONS t Based on the data collected from the former northern UST cluster area, AGE finds • The shallow-screened data infer a net flow towards then ortheast at a the'deep-screened data delineated a ground water flow direction toward the south-sou0 kiweflst at a gradient of 0 006 ft/ft Ground wateradient observed was similar to the previous quarter However,the flow direction observed during he third 00uarter rotated 180 degrees compared to the flow direction observed during the second quarter • TPH-g was detected in the samples collected from MW-9 and MW-14B at a concentration of 100 µg/1 • MTBE was not detected in the shallow-screened wells sampled during the third quarter 2004 MTBE was detected by EPA Method 8260B in the deep-screened wells MW-9, MW-10', MW-11B,MW-12B;MW_13' 13and MW-14B at concentrations as high as 110µg/l(MW-9) The reported MTBE concentrations were above the DHS' Prim drinking water Primary MCL of 13 µfill in 1,2-DCA was detected in ground water samples collected from wells, MW-118, MW-12$, Y MW-13B and MW-I4B, the detected concentration exceeded the DHS' MCL , The most impacted ground water appears to be centered around the former UST dispenser location The vertical extent ofthe contamination plume,as well as the lateral extent east and H south of the former UST cluster, is not well defined Based on the data collected from the former southern UST No '3 area, AGE finds ' • The ground water flow direction at the shallow-screened level was inferred to lie towards the southeast at a gradient of 0 003 ft/ft, ground water flow direction at the deep-screened a E level w Advanced GeoEnviro.FARI,Inc 4 r