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TABLE 1 SUMMARY OF GROUNDWATER MONITORING AND ANALYTICAL RESULTS Gardner Property,Thornton,CA Page 2 of 7 measured in feet MSL Re orted to u /I Well ID Date Wellhead Depth to G W Benzene Toluene Ethyl Xylenes TPHg MTBE Fuel Dtssoved Elev Water Elev Benzene EPA 8020 Ox enates Oxygen MW2 11/06/90 981 1234 -253 44 <0 5 <0 5 <0 5 <50 — 02/19/91 981 1107 -126 17 <05 <0 5 1 2 70 —10111/91 981 1229 -248 <0 5 <0 5 <0 5 <0 5 <50 — -- 10l29191 959 1196 -237 — -- — — — — 03/04/92 959 997 -038 19 1 0 <0 5 1 0 310 - -- 03/13/92 959 962 -003 -- -- — -- '-- — - 09/01/92 959 1275 -316 50 <0 5 <0 5 06 110 - 12/03/92 959 1172 -213 38 28 08 44 830 — -- 03/24/93 959 634 325 120 72 22 94 1 700 07/23/93 959 810 1 49 21 1 2 <0 50 39 270 — 12!27193 959 896 063 59 1 2 <0 50 36 210 — 03/30/94 959 797 1 62 -- — -- -- — - — 06124/94 959 922 037 <0 50 069 <0 50 21 140 09/16/94 959 1151 -192 66 079 <0 50 1 7 160 — 12/21/94 959 1034 -075 <0 50 <0 50 <0 50 077 50 — 03/30/95 959 497 462 <0 50 <0 50 <0 50 <0 50 <50 06/30195 959 614 345 <0 50 <0 50 <0 50 80 <50 09/29/95 959 932 027 <0 50 <0 50 <0 50 <0 50 <50 -- 12129195 959 864 095 <0 50 <0 50 <0 50 1 9 <50 03129/96 959 434 525 <05 <0 5 <0 5 <05 <50 06/28/96 959 690 269 <0 5 <0 5 <05 <0 5 <50 09/30/96 959 1011 -052 <0 50 <0 50 <0 50 <0 50 <50 — 12117/96 959 905 054 <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 <0 5 <0 5 <50 09/18/97 959 1093 -1 34 <0 5 <0 5 <0 5 <0 5 <50 - <MDLs 12/16/97 959 996 -037 <0 5 <0 5 <0 5 <2 <50 -- 03/02/98 959 336 623 <0 5 <0 5 <0 5 <2 <50 <5 06/30/98 959 540 419 <0 50 <0 50 <0 50 <0 56 <50 — -- -- 09/29/98 959 1045 -086 <0 50 <0 50 <0 50 <0 50 <50 -- — <1 000 12/23/98 959 942 017 <0 50 <0 50 <0 50 <0 50 <50 <2 5 — -- 04/05/99 959 765 1 94 <0 50 <0 50 <0 50 <0 50 <50 <5 0 — 07/09/99 9 59 925 034 <0 50 <0 50 <0 50 <0 50 <60 <2 5 — 10/07/99 959 1105 -146 <0 500 <0 500 <0 500 <0 500 <50 0 -- - 12/28/99 959 1024 -065 <0 500 <0 500 <0 500 <0 500 <50 0 -- 03/21/00 959 759 200 <0 500 <0 500 <0 500 <0 500 <50 0 <2 50 07/13100 959 923 036 <0 500 <0 500 <0 500 <0 500 <50 -- 09/27/00 959 1062 -103 <0 5 <0 5 <0 5 <0 5 <50 — <MDLs - 12120/00 959 1045 -086 — — -- -- -- — 03/29/01 959 945 014 <0 5 <0 5 <0 5 <0 5 <50 <50 — 06/18/01 9 59 1065 -116 <0 5 <0 5 <0 5 <0 5 <50 <5 0 - 09/24/01 959 1176 -217 <0 5 <0 5 <05 <05 <50 <5 0 — — 01115/02 959 1039 -060 <0 5 <0 5 <0 5 <1 0 <50 <5 0 -- — 04/03/02 1 959 1 971 1 -012 1 <0 5 1 <05 I <05 I <1 0 1 <50 1 <5 0 — W 162592%TA8LE5%TA8LEGW As[3/21/20021