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r Table 2 HISTORIC GROUNDWATER LEVELS AND CHEMICAL ANALYSIS RESULTS July 2003 Through October 2003 Circle K Store 01205 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 8021E 8260B Elevation (feet) (feet) (feet) (feet) (feet) (µg/1) (41) (pg/1) (pg/1) (41) W/l) (Ng/1) W/1) MW-1 (Screen Interval in feet 6 0-26 0) 7/25/2003 1762 14 65 000 2 97 -- 70000 110 1600 3200 23000 -- ND<400 10/9/2003 1762 1585 000 177 -120 - 3100 34 34 260 820 ND<20 MW-2 (Screen Interval in feet 60-260) 7/25/2003 1750 14 56 000 294 -- -- 170 072 ND<0 50 3 6 2 9 35 10/9/2003 17 50 1590 000 170 -124 76 ND<0 50 ND<0 50 ND<0 50 ND<l 0 -- 37 MW-3 (Screen Interval in feet 80-280) 7/25/2003 18 16 15 19 000 2 97 -- — 2500 ND<0 50 ND<0 50 25 13 -- ND<2 0 10/9/2003 1816 1639 000 1 77 -120 - 260 ND<0 50 ND<0 50 ND<0 50 ND<1 0 -- ND<2 0 MW-4 (Screen Interval in feet 8 0-28 0) 7/25/2003 1775 1477 000 298 -- 2500 30 27 57 89 -- 32 10/9/2003 1775 1589 000 1 86 -1 12 1000 ND<0 50 ND<0 50 75 ND<1 0 ND<2 0 MW-5 (Screen Interval in feet 4 0-24 0) 7/25/2003 1648 13 55 000 293 -- -- 6400 200 990 2700 11000 ND<400 10/9/2003 1647 1475 000 172 -121 - 4500 79 54 600 710 -- ND<20 MW-6 (Screen Interval in feet 4 0-24 0) 7/25/2003 1668 13 83 000 2 85 — 6400 30 200 510 1700 - 320 10/9/2003 1667 15 10 000 157 -128 - 1700 2 9 17 80 300 -- 180 MW-7 (Screen Interval in feet 4 0-24 0) 7/25/2003 17 81 1490 000 291 -- 31000 ND<25 310 1400 4800 ND<100 10/9/2003 1781 1618 000 1 63 -128 7000 ND<10 65 240 1200 ND<40 MW-8 (Screen Interval in feet 4 0-24 0) 7/25/2003 1726 1423 000 303 -- - ND<50 ND<0 50 ND<0 50 ND<0 50 ND<1 0 - ND<2 0 10/9/2003 1725 1536 000 189 -1 14 -- ND<50 ND<0 50 ND<0 50 ND<0 50 ND<1 0 ND<2 0 MW-9 (Screen interval in Leet DNA,) 7/25/2003 1634 1338 000 296 — 28000 22 120 2000 6000 ND<40 01205 Pagel of 2