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n <br /> 1 { <br /> 08 March 2004 <br /> i AGE-NC Project No 98-0432 <br /> Page 3 of 4 <br /> The ground water flow direction was inferred to be towards the northwest, at a gradient of <br /> approximately 0 004 ft/ft near the former UST locations (Figure 3) <br /> 32 GROUND WATER ANALYTICAL RESULTS <br /> ' TPH-d and BTEX compounds were not detected in the ground water sample collected this quarter <br /> TPH-g was detected in the sample from well MW-I with a concentration of 270 microgram per liter <br /> (pg/1) MTBE was detected in water samples MW-1 and MW-2 at concentrations of 270 µg/1 and <br /> 25µg/1,respectively No additional petroleum hydrocarbon compounds were detected in the samples <br /> analyzed Analytical results from ground water samples are summarized in Tables 2 and 3 The <br /> laboratory reports (CTEL Laboratory ID 0402074), quality assurance and quality control (QA/QC) <br /> ' reports and chain-of-custody forms are included in Appendix)X <br /> ' 4.0 SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br /> ' Dunng the February 2004 monitoring event,ground water was 2 feet low�efr than the previous <br /> quarterly sampling event, the ground water flow direction was nortli at gradient in the area <br /> ' of the former USTs was 0 004 ft/ft ,which was consistent with the prevailing northwesterly <br /> flow direction at the site <br /> ' TPH-g was detected only in sample MW-1 <br /> • MTBE was detected in samples MW-1 and MW-2 Figure 4 depicts the dissolved MTBE <br /> distribution and further MTBE concentrations in well MW-1 and MW-2 have consistently <br /> ' declined since initiation of ground water monitoring at the site <br /> • The dissolved MTBE appeared to be limited to on-site monitoring wells <br /> ' 5.0. RECOMMENDATIONS <br /> Based on the results of this investigation, AGE recommends <br /> ' • Continuation of quarterly ground water monitoring, the next monitoring event is scheduled <br /> for May 2004 <br /> ' • If warranted, preparation of remedial action work plan or based on stable dissolved MTBE <br /> concentrations a closure summary report <br />' Advanced GeoEnvironmental,Inc <br />