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t � r TABLE 1 SUMMARY OF GROUNDWATER MONITORING AND ANALYTICAL RESULTS Gardner Property,Thornton,CA Page 2 of 7 (measured in feet MSL) (Re orted in u /l} Well ID Date Wellhead Depth to G W Benzene Toluene Ethyl Xylenes TPHg MTBE Fuel Dissoved Elev Water Elev Benzene (EPA 8020) Oxygenates Oxygen MW2 11/06/90 9 81 1234 -253 44 <0 5 <O 5 <0 5 <50 — 02/19/91 981 1107 -128 17 <05 <0 5 12 70 — --10/11/91 981 1229 -2 48 <0 5 <0 5 <0 5 <0 5 <50 — — 10/29/91 959 11 96 -237 -- -- — — _ 03/04/92 9 59 997 -0 38 19 1 0 <0 5 10 310 — -- 03/13/92 959 962 -003 -- -- — — — 09/01/92 959 1275 -316 5 0 <0 5 <0 5 06 110 12/03/92 959 1172 -213 38 2 8 08 44 830 — 03/24/93 959 634 325 120 72 22 94 1,700 — — - 07/23/93 959 810 149 21 1 2 <0 50 3 9 270 -- — 12/27/93 959 896 063 5 9 1 2 <0 50 3 6 210 — — 03130/94 959 7 97 162 — — — — _ _ -- 06/24194 959 922 037 <0 50 069 <0 50 21 140 — -- 09/16/94 959 1151 -192 65 079 <0 50 17 160 -- — 12121/94 959 1034 -075 <0 50 <0 50 <0 50 077 50 — 03/30/95 959 497 4 fit <0 50 <0 50 <0 50 <0 50 <50 — 06/30/95 959 614 345 <0 50 <0 50 <0 50 so <50 — — 09/29/95 959 932 027 <0 50 <0 50 <0 50 <0 50 <50 — 12/29/95 959 864 095 <0 50 <0 50 <0 50 19 <50 — — 03/29/96 959 434 525 <0 5 <0 5 <05 <0 5 <50 — 06128/96 959 690 269 <0 5 <0 5 <0 5 <05 <50 — - 09/30/96 959 1011 -052 <0 50 <0 50 <0 50 <0 50 <50 -- - 12/17/96 959 905 054 <0 50 <0 50 <0 50 <0 50 <50 — - 03/25/97 959 392 567 <0 50 <0 50 <0 50 <0 50 <50 — — 06/25/97 959 778 181 <0 5 <0 5 <05 <0 5 <50 — — 09/18/97 959 1093 -134 <0 5 <0 5 <0 5 <0 5 <50 — <MDLs 12/16/97 959 996 -037 <05 <05 <0 5 <2 <50 -- — 03/02/98 9 59 336 623 <05 <05 <0 5 <2 <50 <5 06/30/98 959 540 419 <0 50 <0 50 <0 50 <0 50 <50 — — - 09129l98 959 1045 -086 <0 50 <0 50 <0 50 <0 50 <50 — -- -1,000 12123/98 9 59 9 42 0 17 <0 50 1 <0 50 <0 50 <0 50 1 <50 1 <2 5 1 -- — i W 49a32E\rABLE%TA8LEGW%LS[I MASI