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Table 1 SUMMARY OF GROUNDWATER LEVELS AND CHEMICAL ANALYSIS RESULTS July 13,2004 Former 76 Station 4409 Date TOC Depth to LPH Ground- Change in TPH-G TPPH Benzene Toluene Ethyl- Total MTBE MTBE Comments Sampled Elevation Water Thickness water Elevation 8260B benzene Xylenes 8021B 8260B Elevation (feet) (feet) (feet) (feet) (feet) (µg/1) (pg/1) (µg/1) (µg/3) (µg11) (µg11) (Ag/l) (µg/1) MW-1 (Screen Interval in feet 30 0-50 0) 07/13/04 1144 3533 000 -23 89 -330 300 390 ND<2 5 ND<2 5 ND<2 5 ND<5 0 -- 580 MW-2 (Screen Interval in feet 250-450) 07/13/04 1268 3485 000 -22 17 -126 ND<50 ND<50 065 074 060 ND<1 0 - 2 2 MW-3 (Screen Interval to feet 25 0-45 0) 07/13/04 1202 34 13 000 -2211 -1 18 53 67 ND<0 50 ND<0 50 ND<0 50 ND<1 0 -- 48 MW-4 (Screen Interval in feet 25 0-45 0) 07/13/04 1149 3335 000 -21 86 -124 140 130 ND<O 50 ND<O 50 ND<O 50 ND<l 0 -- 190 MW-5 (Screen Interval in feet 700-800) 07/13/04 12 17 34 15 000 -2198 -127 1800 3100 ND<2 5 ND<2 5 140 270 -- 13 MW-6 (Screen Interval in feet 700-800) 07/13/04 1162 33 63 000 -2201 -1 12 1100 1500 180 47 6 0 21 -- 3 6 MW-7 (Screen Interval in feet 700-800) 07/13/04 1140 3343 000 -2203 -120 ND<50 ND<50 ND<O 50 ND<O 50 ND<O 50 ND<1 0 -- 15 MW-8 (Screen Interval in feet 700-800) 07/13/04 1261 3474 000 -22 13 -123 240 300 20 3 4 22 ND<l 0 -- ND<O 50 MW-9 (Screen Interval in feet 700-800) 07/13/04 1087 3281 000 -21 94 -124 1300 1100 5 4 3 2 110 68 -- 3 7 MW-10 (Screen Interval in feet 69 0-79 0) 07/13/04 1130 3321 000 -2191 -131 2100 1200 ND<5 0 ND<5 0 ND<5 0 ND<10 -- 1100 MW-11 (Screen Interval in feet 770-820) 07/13/04 1240 3487 000 -2247 -1 17 ND<50 ND<50 ND<O 50 ND<O 50 ND<O 50 1 1 -- ND<O 50 MW-12 (Screen Interval in feet 78 0-83 0) 07/13/04 1064 3248 000 -21 84 -1 18 ND<50 ND<50 ND<O 50 ND<O 50 ND<O 50 ND<1 0 -- ND<O 50 MW-13 (Screen Interval to feet 78 0-83 0) 4409 Page I of 2