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1 <br /> 17 October 2003 <br /> • AGE-NC Project No 98-0432 �Vy,i <br /> Page 3 of 4 '11 <br /> V , <br /> ' 0 003 ft/ft near the former UST locations (Figure 3) <br /> ' 32 GROUND WATER ANALYTICAL RESULTS <br /> TPH-g was detected In the ground water sample collected from well MW-1 at a concentration of <br /> ' 1,600 microgram per liter(µg/1) MTBE detected was In water samples MW-1, MW-2 and MW-3 <br /> by EPA Method 8260 at concentrations of 1,500 µg/l, 43 µg/1 and 21 µg/1, respectively <br /> No additional petroleum hydrocarbon compounds were detected In the samples analyzed Analytical <br /> results from ground water samples are summarized in Tables 2 and 3 <br /> ' The laboratory reports (CTEL Laboratory ID # 0307055), quality assurance and quality control <br /> (QA/QC) reports and chain-of-custody forms are Included In Appendix B <br /> 4 0. SUMMARY AND CONCLUSIONS <br /> ' The following conclusions were drawn from the results of this investigation <br /> 0 During the July 2003 monitoring event, the ground water flow direction was north, which <br /> ' was consistent with the prevailing northerly flow direction at the site,the gradient In the area <br /> of the former USTs was 0 0036 ft/ft <br /> 1 0 TPH-g was detected only in sample MW-1 <br /> • MTBE was detected In samples MW-1, MW-2 and MW-3 at concentrations as high as <br /> 1, 00 µg/1 The dissolved MTBE appeared to be limited to on-site monitoring wells <br /> 1 <br /> 5.0. RECOMMENDATIONS <br /> Based on the results of this Investigation, AGE recommends <br /> ' a Continuation of quarterly groundwater monitoring,the next monitoring event Is scheduled <br /> for October 2003 <br /> Preparation of corrective action plan for the remediation of MTBE-Impacted ground water <br /> Advanced GcoEnvi ro n mental,Inc <br /> 1 <br />