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1 <br />' 04 June 2003 <br /> AGE-NC Project No 95-0141 <br />' Page 4 of 5 <br />' At the time of the March 2003 ground water monitoring event, ground water elevations at <br /> the site ranged from 12 74 feet to 13 41 feet The shallow ground water was inferred to flow <br /> generally toward the east-southeast, at a gradient of 0 003 foot/foot while the deeper ground <br />' water zone was inferred to flow generally toward the east-southeast, at a gradient of 0 002 <br /> foot/foot Wells MW-3 through MW-5 were "drowned", and likely did not yield samples <br /> fully representative of ground water conditions near the top of saturated zone,where fuel <br />' hydrocarbons would be expected to have the greatest impact <br /> • During the first quarter 2003, TPH-g was detected in ground water samples collected from <br /> seven of the fifteen wells at the site at concentrations as high as 140,000 gg/l TPH-g- <br />' impacted shallow ground water has been defined (Figure 5),however,the TPH-g-impact to <br /> the deeper ground water zone has not been defined toward the south, cast and north (Figure <br /> 6) <br />' During the first quarter 2003, one or more BTE&X constituent was detected in seven of the <br /> fifteen wells ground water wells The benzene concentrations in all seven wells exceeds the <br /> DHS's Maximum Contaminant Level (MCL) for benzene in drinking water The <br /> concentrations of toluene, ethylbenzene and total xylenes in well EX-1 were significantly <br /> above their respective MCLS <br /> TBA was detected in five ground water samples at concentrations as high as 20 gg/1 Other <br /> fuel oxygenates were not detected in any of the ground water samples collected during first <br /> quarter 2003 <br /> • During the first quarter 2003, 1,2-DCA was detected in ground water samples collected from <br /> ten of the fifteen wells at the site at concentrations as high as 340 gg/l(EX-1) EDB was also <br /> detected in the ground water sample collected from well EX-1 at a concentration of 88 gg/l <br /> The detected concentrations of 1,2-DCA and EDB were either at or above the respective <br /> MCLS 1,2-DCA-impacted shallow ground water has not been defined toward the east, and <br /> 1,2-DCA-impacted deeper ground water zone has not been defined toward the south,east and <br /> north A map illustrating the approximate extent of 1,2-DCA in shallow and deep ground <br /> water is presented in Figures 5 and 6 <br /> 5.0. RECOMMENDATIONS <br /> i <br /> I <br /> • <br /> � 1 <br /> I <br /> I <br />