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01 October 2004 <br /> AGE-NC Project No 97-0333 <br /> Page 8 of l l i <br /> s <br /> 3 5 2 Laboratory Results of Ground Water Samples I <br /> 1 ` <br /> During the March 2004 sampling event,TPH-g was detected in twenty-four water samples collected E <br /> 1 from wells MW-1 through MW-4, MW-7 (A-E), MW-8 (A-D), MW-9 B, MW-10 (B-D),MW-11 <br /> (C and D), MW-12 (A-D) and MW-13C at concentrations as high as 52,000 µg11 (MW-2) <br /> { <br /> 1 Vanous BTEX constituents were detected in three water samples collected from wells MW-2, <br /> MW-3 and MW-4 at maximum concentrations of 410 µg/l benzene (MW-2), 140 µg/1 toluene <br /> (MW-2), 36 µg/1 ethylbenzene (MW-2) and 370 µg/1 xylenes (MW-2) <br /> MTBE(utilizing EPA Method 8260M)was detected in ten water samples collected from monitoring <br /> wells MW-1,MW-2,MW-3,MW-7(A-E)and MW-8(A and C)at concentrations as high as 47,000 <br /> ' µg/l (MW-2), iso-concentration maps displaying the estimated extent of dissolved MTBE in First <br /> Zone and Second Zone aquifer are depicted on Figures 8 and 9 <br /> ' TAME was detected in four water samples collected from monitoring wells MW-1,MW-2,MW-3, <br /> and MW-7A at concentrations as high as 1,400 µg/1 (MW-2), 1,2-DCA was detected in eight water <br /> samples collected from monitoring wells MW-7 (B-E), MW-8 (B and C) and MW-10 (B and C)at <br /> concentrations as high as 9 3 µg/l (MW-10B), EDB was detected in a water sample collected from <br /> well MW-8A at a concentration of 4 µg/1 <br /> ' PCE was detected in 39 of 46 water samples collected from monitoring wells MW-1 through <br /> MW-13 at concentrations as high as 1,600µg/1 from MW-3,TCE was detected in 21 water samples <br /> ' collected from wells MW-3, MW-4, MW-7 (A-E), MW-8 (B-D), MW-9 (A-B), MW-10 (B-D), <br /> MW-11 (C and D)and MW-12(A-D)at concentrations as high as 170 µg/1 from well MW-10B An <br /> iso-concentration map displaying the estimated extent of dissolved PCE in First Zone water is <br /> depicted in Figure 10 <br /> No other constituents of concern were detected above laboratory reporting limits in the water y <br /> samples collected during the first quarter 2004 sampling event Analytical results of ground water <br /> monitoring well samples are summarized in Tables 3 and 4 The laboratory reports (Cal Tech <br /> Environmental Laboratories Project Nos 0404-034 and 0404-012) and chain-of-custody forms are <br /> ' presented in Appendix E <br /> 1 <br /> ' Advanced GeoEnviron mental,Inc <br /> 1 <br />