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TABLE 1 SUMMARY OF GROUNDWATER MONITORING AND ANALYTICAL RESULTS Gardner Property,Thornton,CA Page 3 of 7 measured in feet MSL Re orted In u /I Well ID Date Wellhead Depth to G W Benzene Toluene Ethyl Xylenes TPHg MTBE Fuel DEssoved Elev Water Elev Benzene EPA 8020 Oxygenates Oxygen MW3 11106/90 1009 1258 -249 18 11 63 98 4 500 — — 02/19/91 1009 1131 -122 270 15 60 110 4 400 — 10/11191 1009 1253 -244 14 21 3 0 83 7 400 — - 10/29/91 987 1219 -232 — — — — — -- — 03104/92 987 1020 -033 31 17 68 52 17,000 - — 03/13/92 987 986 001 — — -- — + — -- — 09/01/92 987 1302 -315 27 11 39 10 4,100 - — 12/03192 987 1196 -209 130 14 26 45 6 000 -- — 03/24/93 9 87 658 329 230 25 45 68 13 000 — - 07/23/93 987 838 149 69 <0 50 29 17 2000 — - 12/27/93 987 921 066 31 29 330 460 9 300 — - 03/30194 987 821 166 — -- — - -- — - 06124/94 9 87 944 043 <D50 <0 50 290 190 8 400 - 09/16194 987 1177 -1 90 <0 50 11 370 230 8 300 — - 12/21/94 987 1060 -073 12 <0 50 14 17 3 400 - 03/30/95 9 87 519 468 83 60 880 400 5800 — 06/30/95 987 635 352 81 19 <0 50 15 610 — - 09129/95 987 952 035 22 14 22 19 1 900 — — • 12/29/95 987 8 83 1 04 36 <0 50 <0 50 29 460 — = 03/29196 9 87 455 532 15 27 21 5 5 940 06/28/96 987 709 278 <0 5 <05 <0 5 <0 5 <50 — 09/30/96 987 1028 -041 10 <05 <0 5 <0 5 190 -- — 12/17/96 987 924 063 48 06 <D5 17 300 — 03/25/97 987 413 574 52 <05 <05 1 9 140 — - 06/25/97 987 794 193 <0 5 <05 <0 5 20 670 — 09/18197 9 87 11 10 -123 20 <05 <0 5 <0 5 220 — <MDLs 12!16197 9 87 1014 -027 07 <0 5 <0 5 <05 160 — -- 03/20/98 987 358 629 <05 <0 5 <0 5 <05 150 — 06/30/98 987 560 427 12 <0 50 <0 50 063 85 — -- 09/29/98 987 1069 -082 11 067 <D50 21 170 — <1 000 12/23198 987 9 62 025 1 0 056 <0 50 086 140 <25 - — 04/05/99 9 87 788 199 <0 5 <05 <05 <0 5 110 <50 — 07/09199 987 944 043 <0 5 <05 <05 <0 5 <50 <2 5 — - 10107/99 987 11 25 -138 <0 500 <0500 <0 500 <0 500 <50 0 — — 12/28/99 987 1042 -055 <0 500 <0 500 <0 500 <0 500 <50 0 — — 03/21/00 967 780 207 <0 500 <0500 <0 50D <0 500 <50 0 <2 50 — - 07/13/00 9 87 939 048 <0 500 <0 500 <0 500 <0 500 <50 — -- 09/27100 9 87 1080 -093 <0 5 <0 5 <05 <0 5 <50 -- <MDLs 12120/00 987 1062 -075 <0 5 <0 5 <05 <0 5 <50 <50 — 03!29101 9117 9 64 1123 <0 5 411 <0 5 <0 5 <50 <5 0 06118/01 9 87 1082 -095 <0 5 <05 <0 5 <0 5 <50 <5 0 09/24101 987 1194 -207 <0 5 <0 5 <0 5 <05 <50 <5 0 — — 01/15/D2 987 1058 -071 <G5 <0 5 <0 5 <1 0 <50 <5 0 - — 04/03/02 987 j 9 90 0 03 <0 5 <05 1 <05 I <10 I <50 <5❑ — — W%625B2WABLMtA8LEGW.Is 18/21120021