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t <br /> I <br />' 07 June 2000 <br /> AGE-NC Protect No 99-0657 <br /> Page 6 of 7 <br />' 3 5 HYDROCARBON-IMPACTED GROUND WATER <br /> After the installation and development of the four ground water wells on the site, each ground water <br /> monitoring well was sampled Each sample was analyzed for TPH-g, TPH-d,BTEX,EDB, 1,2 DCA, <br /> and each sample was analyzed for the suite of five fuel additives <br /> IThe analytical results from the April sampling event are as follows <br /> TPH-g was detected in the water samples collected from monitoring wells MW1 through MW4 at <br />' concentrations as high as 90,000 micrograms per liter (µg/1) TPH-d was detected in the water <br /> samples collected from monitoring wells MW 1 through MW-4 at concentrations as high as 1,700 <br />' µg/1 The highest concentration of hydrocarbon-impacted ground water resides in the area of the <br /> former USTs and downgradient of the former UST area (MW-4) <br />' BTEX compounds were detected in the water samples at concentrations as high as 13,000 ,ug/l, <br /> 12,000µg/1, 980µg/1 and 8,900µg/1,respectively MTBE was detected by EPA Method 8260 in the <br /> ground water samples from wells MW1 through MW4 at concentrations of 4,900 µg/l, 1,700 µg/l, <br />' 11 µg/1 and 2,300µg/l,respectively TAME was detected in the ground water sample collected from <br /> MW2 at a concentration of 9 0µg/1 TBA was detected In the ground water samples collected from <br /> MW1 through MW4 at concentrations of 1,500µg/l, 190µg/l, 20µg/1 and 1,000 µg11, respectively <br />' EDB was detected by EPA Method 8021A in the ground water samples collected from MW1,MW2, <br /> MW4 at concentrations of 82µg/1, 0 86µg/1 and 82 µg/1, respectively 1,2 DCA was detected In the <br /> ground water samples collected from all four monitoring wells at concentrations as high as 800µg/l <br /> Analytical results of water samples collected in April 2000 are summarized on Table 3 The <br />' laboratory report (AAL Order No A00040611), QA/QC report and chain-of-custody form are <br /> included in Appendix F <br /> 1 <br /> 4 0. SUMMARY AND CONCLUSIONS <br />' The following conclusions were drawn from the results of this investigation <br />' Saturated soil samples were encountered at approximately 35 feet bsg The static water level <br /> was determined to be approximately 34 50 feet below the well casing tops The prevailing <br /> ground water flow direction in Apnl in this area was toward the southwest <br />' The most intensely hydrocarbon-impacted soil was encountered in the area of the former <br /> USTs, at a depth of 30 feet bsg <br /> I <br /> Advanced CeoEnuronmental,Inc <br />