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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 In u /1) Well ID Date Wellhead Depth to G W Benzene Toluene Ethyl Xylenes TPHg MTBE Fuel Dlssoved Elev Water Elev I Benzene EPA 8020 OxyEenates Oxygen MW2 11/06/90 981 1234 -253 44 <0 5 <0 5 <0 5 <50 -- 02/19/91 981 1107 -126 17 <0 5 <0 5 1 2 70 - 10111l91 981 1229 -248 <0 5 <0 5 <0 5 <0 5 <50 - 10129l91 959 1196 -237 -- -- -- - -- 03/04/92 959 997 -038 19 1 0 <0 5 10 310 - 03113l92 959 962 -003 -- -- -- — -- 09101l92 959 1275 -316 50 <0 5 <0 5 06 110 12/03/92 959 11 72 -213 38 28 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 59 1 2 <0 50 36 210 -- 03/30/94 959 797 162 -- -- -- -- 06124/94 959 922 037 <0 50 069 <0 50 21 140 — 09/16/94 959 11 51 -192 65 079 <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 - 06/30/95 959 614 345 <0 50 <0 50 <0 50 80 <50 - — 09/29/95 959 932 027 <0 50 <0 50 <0 50 <0 50 <50 - 12/29/95 959 1164 095 <0 50 <0 50 <0 50 1 9 <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 <0 5 <0 5 <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 <05 <0 5 <0 5 <0 5 <50 -- 09/18/97 959 1093 -134 <05 <0 5 <0 5 <0 5 <50 — <MDLs 12/16/97 959 996 037 <05 <0 5 <0 5 <2 <50 -- 03l02198 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 50 <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 -- 04/05/99 959 765 194 <0 50 <0 50 <0 50 <0 50 <50 <5 0 - 07l09199 959 925 034 <0 50 <0 50 <0 50 <0 50 <50 <2 5 10/07/99 959 11 05 -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 -- 09/27/00 959 1062 -103 <0 5 <0 5 <05 <0 5 <50 <MDLs 12/20/00 959 1045 -086 -- -- -- - -- -- 03129/01 959 945 014 <0 5 <0 5 <0 5 <0 5 <50 <5 0 06/18/01 959 1065 -106 <0 5 <0 5 <0 5 <0 5 <50 <5 0 =_ 09/24/01 959 11 76 -2 17 <0 5 <0 5 <0 5 <0 5 <50 <5 0 01/15/02 959 1 1039 0 80 <0 5 <0 5 1 <0 5 1 <1 0 <50 1 <5 0 W\82582%TA9LE5\Tab1e9w[1/24/02]