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r <br /> r <br /> r <br /> 26 April 2004 k 3 <br /> AGE-NC Project No 9710333 ` <br /> Page 9of12 ` <br /> r <br /> 4 5 1 3 Third Zone_Aquifer <br /> Ground water elevation data collected in the Third Zone Aquifer (102 to 120 feet bsg) inferred a <br /> ' south-southeast ground water flow direction Ground water gradients were approximately 0 001 ft/ft <br /> oriless near the site (Figure 6) <br /> , <br /> 1 4 5 1 4 Primary Aquifer Zone <br /> ' Ground water elevation data collected in the Primary Aquifer Zone (128 to 150 feet bsg) inferred a <br /> south-southwest ground water flow,direction Ground water gradients were approximately 0 001 ft/ft <br /> or less near the site (Figure 7) <br /> 4 5 2 Laboratory Results of Ground Water Samples <br /> During the November 2003 sampling event, TPH-g was detected in water samples collected from <br /> wells MW-1 through MW-4, MW-6, MW-7 (A-E), MW-8 (A-D), MW-9 B, MW-10 (B-E), <br /> r <br /> MW-11E, MW-12 (A-D) and MW-13C at concentrations as high as 33,000 µg/l (MW-2) <br /> Various BTEX constituents were detected in water samples collected from wells MW-1, MW-2, <br /> MW-3 and MW-6 at maximum concentrations of 500 ugd (toluene,MW-6) Benzene was detected <br /> from wells MW-1, MW-2, MW-3 and MW-6 at concentrations as high as 250 gg/l (MW-2) <br /> 1 ! <br /> `MTBE (utilizing EPA Method 8260M) was detected in water samples collected from monitoring <br /> 'wells MW <br /> -1 MW-2 MW-3 MW-6 MW-7(A-E),MW-8 A and C and MW-12B at concentrations <br /> as high as 28,000 µg/l(MW-2),iso-concentration maps displaying the estimated extent of dissolved k <br /> 'MTBE in First Zone and Second Zone aquifer are depicted in Figures 8 and 9 <br /> TAME wvas detected in water samples collected from monitoring wells MW-1, MW-2, MW-3, , <br /> ' <br /> 'MW-6, MW-7 (A and B), MW;8A at concentrations as high as 2,300 µg/l (MW-2), 1,2-DCA was <br /> detected in water samples collected from monitoring wells MW-7 (B-D), MW-8 (B and C} and <br /> MW-10B at concentrations as high as 15 µg/l'(MW-8B), EDB,was detected in a'.water sample <br /> collected from well MW-8A at a concentration of 4 µg/l <br /> PCE was detected in 39 of 47 water samples collected frommonitoringwells MW-1 through MW- <br /> 13 at,concentrations as high as 1,000 µg/l from MW-1 OB and 1,400 µg/l from well MW-12A TCE <br /> was detected in sample MW-lOB at 78 µ.g11 An iso-concentration map displaying the estimated <br /> extent of dissolved PCE,in First Zone water is depicted in Figure 10 <br /> t Er <br /> E I Advanced GeoEnrironmental,lnc <br /> r i r <br /> 4 4 <br />