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' I I December 2000 AGE-NC Project No 97-0333 ' Page 3 of 5 ' calculated to be between 15 48 feet and 15 67 feet above mean sea level Ground water elevation at the site increased an average 1 30 feet between the July 2000 and the October 2000 ground water monitoring events The ground water elevation data for MW-1, MW-2, MW-3, MW-4 and MW-5 ' during the October 2000 ground water monitoring event is depicted in Figure 3 Ground water flow direction for the area bound by wells MW-1,MW-2, MW-3,MW-4 and MW-5 was generally toward the northeast at a gradient of 0 001 ft/ft, or approximately 5 feet per mile (Figure 3) 1 32 LABORATORY RESULTS OF MONITORING WELL GROUND WATER SAMPLES ' A total of five ground water samples were submitted to a D P HS-certified laboratory in October 2000 TPH-g was detected in water samples collected from wells MW-2, MW-3 and MW-4 at concentrations as high as 140,000 micrograms per liter(,ag/l), respectively, TPH-d was detected in water samples collected from MW-2, MW-3, MW-4 and MW-5 at concentrations as high as 3,000 ' µg11, however, the laboratory reported the TPH-d sample chromatograms to contain significant gasoline range compounds ' BTEX compounds were detected in the ground water samples collected from wells MW-1, MW-2, MW-3 and MW-4 at concentrations ranging as high as 28,000 ug/l (MW-2 toluene) The a eatest I-)cnzcnc was detected in the water sample collected from well MW-2 at a concentration of 18,000 ' ug/1 MTBE, was detected at concentrations as high as 210,000 ug/l in water samples collected at M"'-1, MW-2 and MW-3 by the CPA 8020 analysts ' MTBE was detected in ground water samples collected from MW-1, MW-2, MW-3 and MW-4 utilizing EPA Method 8260 Modified at concentrations as high as 180,000 ug/l TAME. %Gas detected in a water sample collected from MW-1 at aconcentration of 1,100 ug/1 No other fuel oxygenated ' compounds were detected above the respected laboratory reporting limits Analytical results of the ground water samples are summarized in Table 2 The laboratory reports (McCampbell Analytical Inc l D No 51899 through 51903) and chain-of-custody forms are presented in Appendix B 40 SUMMARY kND C'ONCLUSIONS 1 hr implications from the Octohcr 2000round wat er g 'n monitoring eNcnt aic as lollows L1101-Ind «ater llo« direction at thr stir appeaied to be onentcd gcn�raI1N tm%ards JIL northeast at a gradient oft} 001, due to the log} gradient at the. site, slight vanations to ground �\dirt I11Ca Uren]rnts of rhange5 of re.chai gr dischargr ofthr IOraI giuund atrr could greatly 111nd1 fX, t;10017d ,iii ilov d=rrrtMP °rnrr�nuf cnHnF�uainui[i 1n i