Laserfiche WebLink
4 4 <br /> lie 10 October 1997 <br /> AGE-NC Project No 95-0142 <br />' Page 3 of 4 <br /> was detected in the sample at a concentration of 16 ppb However MTBE was not detected in the <br />' same sample by EPA method 8260 Detectable concentrations of BTE&X compounds were present <br /> in the sample from MW-4 , <br /> Analytical results of allround water sam les are summarized in Table 2 -Analytical Results o <br /> g Pf <br /> Ground Water Sample -Analyzed by EPA methods 8015 and 8020 Analytical results of all ground <br />' water samples are summarized in Table 3 -Analytical Results of Ground Water Sample -Analyzed <br /> by EPA methods 8260 Analytical results of all ground water samples are summarized in Table-4 - <br /> Analytical Results of Ground Water Sample -Analyzed by EPA methods 8240 The laboratory report <br />' (MAI Laboratory I D Nos 80576 through 80582), chain-of-custody and QA/QC report are <br /> included in Appendix B <br /> 4 0 SUMMARY/CONCLUSIONS <br /> Based upon data collected from the site, AGE has made the following conclusions <br /> • The ground wafer surface at the site has remained approximately eight feet above the tops <br /> of the screened casings in ground monitoring wells MW-1 through MW-3 for the past year, <br /> therefore, samples collected from these wells may not be representative of the upper aquifer <br />' conditions where the maximum impact of fuel hydrocarbons would be expected <br /> • Ground water flow direction is generally toward the northeast in the vicinity of the <br /> hydrocarbon release (TK 1-90), therefore well MW-4 represents the down-gradient well at <br /> the site <br /> • Detectable concentrations of hydrocarbons were present in both down gradient wells MW-4 <br /> and,MW-5 'Concentrations in both wells,have remained constant ovei the past quarter <br /> The highest concentration of dissolved petroleum hydrocarbons were detected in vapor well <br /> VW-1, located immediately adjacent to the former TK1-90 UST Concentrations of <br /> hydrocarbons detected in the sample_collected from this well remained similar to the ' <br /> previous quarters sampling results Concentrations of TPI -g and BTE&X in the ground 5 <br /> water samples collected from vapormells VW-2 and VW-4 have remained similar to the <br /> I concentrations in samples also collected during the previous quarter, while hydrocarbon <br /> concentrations decreased in the sample collected from VW-3 <br /> 5 5 <br /> Advanced GeoEnvironmental,Inc <br />