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TABLE 1 SUMMARY OF GROUNDWATER MONITORING AND ANALYTICAL RESULTS Gardner Property,Thornton,CA Page 3 of 7 (measured 1n feet MSU (Re rted1n u /0 Well ID Date Wellhead Depth to G W Benzene Toluene Ethyl Xylenes TQ MTBE Fuel Dlssoved Elev Water Elev Benzene (EPA 8020) Oxygenates O en MW3 11106!90 1009 1258 -249 18 11 63 98 4,500 — — - 02/19/91 1009 1131 -122 270 15 60 110 4,400 -- — -- 10/11/91 1009 1253 -244 14 21 30 83 7,400 — — -_ 10/29/91 987 1219 -232 — — — — — — -- -- 03/04/92 987 1020 -033 31 17 68 52 17,000 — — -- 03/13/92 987 986 001 — — — — — — — - 09/01/92 987 1302 -315 27 11 39 10 4,100 -- -- - 12/03/92 9 87 1196 -2 09 130 14 26 45 6,000 — — - 03/24/93 9 87 658 329 230 25 45 68 13,000 — — -- 07/23/93 987 838 149 69 <0 50 29 17 2,000 — — - 12/27/93 11117 9 21 066 31 29 330 460 9,300 — — -- 03/30/94 9 87 821 166 — — — -- — — — -- 06/24/94 987 944 043 <0 50 <0 50 290 190 8,400 — — - 09/16/94 987 1177 -190 <0 50 11 370 230 8,300 — — - 12121/94 987 1060 -073 12 <0 50 14 17 3,400 — — 03130/95 987 519 468 83 60 880 400 5,800 -- -- 06/30/95 9 87 635 352 81 19 <0 50 15 610 — -- -- 09/29/95 9 87 9 52 035 22 14 22 19 1,900 — — -- 12/29/95 987 883 1 D4 36 <0 50 <0 50 2 9 480 — — - 03/29/96 987 455 532 15 2 7 21 55 940 — — 06/28/W 9 87 709 278 <0 5 <0 5 <05 <0 5 <50 — — 09/30/96 987 1028 -041 10 <05 <0 5 <0 5 190 — -- - 12/17/96 987 924 0 63 48 06 <05 1 7 300 -- — 03/25/97 987 413 574 5 2 <0 5 <0 5 19 140 -- — - 06/25/97 9 87 7 94 193 <0 5 <0 5 <0 5 2 0 670 — — -- 09/18/97 987 1110 -123 2 0 <0 5 <0 5 <0 5 220 — <MDLe -- 12/16/97 987 1014 -027 0 7 <05 <0 5 <0 5 160 — — - 03/20/98 987 358 629 <0 5 <0 5 <0 5 <05 150 — 06/30/98 987 560 427 12 <0 50 <0 50 063 85 — — 09/29/W 9 87 10 69 -082 1 1 067 <0 50 21 170 — — <1,000 r� 11 19492M"BUMIABLEOW 70.8 1121111901