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TABLE 4 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 TPNg MTBE Fuel Dissoved Etev Water Elev Benzene (EPA 8020 Ox enates Ox en MW2 11106/90 981 1234 -253 44 <0 5 <0 5 <0 5 <50 -- 02119191 981 11 07 -1 26 17 <0 5 <0 5 1 2 70 — - 10111/91 981 1229 -248 <05 <0 5 <0 5 <05 <50 10/29/91 9 59 1196 -237 — — — -- — 03/04/92 959 997 -038 19 1 0 <05 10 310 - 03113l92 959 962 003 -- -- — — I-- 09/01/92 9 59 1275 316 50 <05 <0 5 06 110 12103192 959 11 72 -213 38 28 08 44 830 — 03124/93 959 634 325 120 72 22 94 1,700 07123193 959 BID 1 49 21 12 <0 50 39 270 — 12/27/93 959 896 063 59 1 2 <0 50 36 210 03130/94 959 797 1 62 — -- -- — — - — 06/24194 959 922 037 <0 50 069 <0 50 21 140 - 09/16/94 959 1151 -192 65 079 <0 50 1 7 160 12121/94 959 1034 075 <050 <050 <0 50 077 50 — 03/30/95 959 497 462 <0 50 <0 50 <0 50 <0 50 <50 - - 06130/95 959 614 345 <050 <0 50 <0 50 so <50 ' 09129/95 959 932 027 <0 50 <050 <0 50 <0 50 <50 -- - 12/29/95 9 59 864 095 <0 50 e010 <0 50 1 9 <50 " 03/29/96 959 434 525 <0 5 <05 <0 5 <05 <50 06128196 959 690 269 <0 5 <0 5 <0 5 <05 <50 — 09130196 959 1011 -052 <0 50 <050 <0 50 <0 50 <50 - — 12/17/96 959 905 054 <050 <050 <0 50 <050 <50 - 03125197 959 392 567 <050 <0 50 <0 50 <0 50 <50 - 06/25197 959 778 181 <0 5 <0 5 <0 5 <05 <50 09/18/97 959 1093 -134 <0 5 <0 5 <05 <0 5 <50 — <MDLs 12/16197 959 996 -037 <0 5 <0 5 <0 5 <2 <50 -- 03102198 03102/98 9 59 336 623 <0 5 <0 5 <0 5 <2 <50 <5 06/30/98 959 540 419 <050 <050 <050 <0 50 <50 -- 09129/98 959 1045 -086 <050 <0 50 <0 50 <050 <50 — <1 000 12/23198 959 942 017 <0 50 <0 50 <0 50 <050 <50 <2 5 - 04/05/99 959 765 1 94 <0 50 <0 50 <050 <0 50 <50 <50 - — 07/09199 959 925 034 <0 50 <0 50 <0 50 <050 <50 <2 5 — 10107/99 959 1105 -1 46 <0 500 <0 500 <0 500 <0 500 <50 0 12/28199 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 09127/00 959 1062 -1 03 <0 5 <0 5 <0 5 <05 <50 <MDLs 12/20100 959 1045 -086 -- -- -- - — 03/29/01 959 945 014 <0 5 <0 5 <05 <05 <50 <50 — i06/18/01 959 1065 -1 06 <0 5 <0 5 <05 <05 <50 <50 - 09/24/01 959 1176 -211 <0 5 <0 5 <0 5 <05 <50 <50 — 01/15/02 959 1039 -080 <0 5 <0 5 <0 5 <10 <50 <5 0 -- 04/03/02 9 59 971 -0 12 <0 5 1 <0 5 1 <0 5 1 <10 I <50 <5 0 W\62532\TABLEVTABLEGW:la(8/2I12G02)