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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 (Reported in u /1) Well ID Date Wellhead Depth to G W Benzene Toluene Ethyl Xylenes TPHg MTBE Fuel Dlssoved Elev Water Elev Benzene EPA 8020) Oxygenates Oxygen MW2 11/06/90 981 1234 -253 44 <0 5 <05 <0 5 <50 -- 02119/91 981 1107 -126 17 <0 5 <0 5 1 2 70 10/11/91 981 1229 -248 <0 5 <0 5 <0 5 <0 5 <50 — — 10/29/91 959 1196 -237 — — — — — — 08104/92 959 997 -038 19 1 0 <05 1 0 310 - - 03/13/92 959 962 -003 -- — — -- '— 09101/92 959 1275 -316 so <0 5 <05 06 110 — 12103/92 959 11 72 -213 38 28 08 44 830 — - 03124l93 959 634 325 120 72 22 9 4 1 700 - — 07/23/93 959 810 149 21 12 <0 50 3 9 270 — — 12/27/93 969 896 063 59 12 <0 50 36 210 -- — 03/30/94 959 797 162 — — — — -- -- - 06/24/94 959 922 037 <0 50 069 <0 50 2 1 140 - 09/16/94 959 11 51 -192 6 5 079 <0 50 1 7 160 — — 12/21/94 959 1034 -075 <0 50 <0 50 <0 50 077 50 — - 03l30195 959 497 462 <0 50 <0 50 <0 50 <0 50 <50 - 06/30/95 959 614 345 <0 50 <0 50 <050 8 0 <50 - - 09/29/95 959 932 027 <0 50 <0 50 <050 <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 -- = 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 — 12l17/96 959 905 054 <0 50 <0 50 <0 50 <0 50 <50 - -- 03/25/97 959 392 567 <0 50 <0 50 <0 50 <0 50 <50 -- 06/25/97 959 776 181 <05 <0 5 <05 <0 5 <50 -- - 09/18/97 959 1093 -134 <05 <0 5 <05 <0 5 <50 - <MDLs 12/16/97 959 996 -037 <0 5 <0 5 <0 5 <2 <50 -- 03102198 959 336 623 <0 5 <0 5 <0 5 <2 <50 <5 06/30/96 959 540 419 <0 50 <0 50 <0 50 <0 5o <50 -- -- - 09/29/98 959 1045 -036 <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 — 04/05/99 959 765 194 <0 50 <0 50 <0 50 <0 50 <50 <50 -- 07/09/99 959 925 034 <0 50 <0 50 <0 50 <0 50 <50 <25 — 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 - — 07/13/00 959 923 036 <0 500 <0 500 <0 500 <0 500 <50 -- 09/27100 959 1062 -103 <05 <0 5 <05 <0 5 <50 - <MDLs 12/20/00 959 1045 -086 -- -- -- -- — — - 03/29/01 959 945 014 <0 5 <0 5 <0 5 <0 5 <50 <50 -- — 06/18/01 959 1065 -106 <0 5 <0 5 <0 5 <0 5 <50 <50 i 09/24/01 959 11 76 -217 <0 5 <0 5 <05 <0 5 <50 <5 0 — 01/15/02 959 1039 -060 <0 5 <0 5 <0 5 <1 0 <50 <50 -- 04/03/02 1 959 971 1 -012 <0 5 1 <0 5 1 <0 5 1 <10 I <50 <5 0 W\62582\TA13LES\TABLEGW.Is(4/21/2002]