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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 inu /I Well ID Date Wellhead Depth to G W Benzene Toluene Ethyl Xylenes TPHg MTBE Fuel Mssoved Elev Water Elev Benzene EPA 8020 bx enates Oxygen MW3 11/06/90 1009 1258 -249 18 11 63 98 4 500 -- - 02119/91 1009 1131 -122 270 15 60 110 4 400 — — 10/11191 1009 1253 -244 14 21 30 83 7 400 — — 10/29/91 9 87 1219 -232 -- -- -- -- -- - — 03/04/92 987 1020 -033 31 17 68 52 17 000 - - 03/13/92 9 87 986 001 -- -- -- -- - — 09/01/92 9 87 13 02 -315 27 11 39 10 4 100 - - 12/03/92 987 11 96 -209 130 14 26 45 6 000 -- -- 03/24/93 987 658 329 230 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 — 03/30/94 987 821 166 — — — -- -- 06/24194 987 944 043 <0 50 <0 50 290 190 8 400 — 09/16/94 987 11 77 -1 90 <0 50 11 370 230 8 300 — 12/21194 9 87 1060 -073 12 <0 50 14 17 3 400 — - 03/30/95 987 519 4 68 83 60 880 400 5 800 — — 06/30/95 987 635 3 52 81 1 9 <0 50 15 610 — — 09/29/95 987 952 035 22 1 4 22 19 1 900 — - 12/29/95 987 $83 104 36 <0 50 <0 50 29 480 — — 03/29/96 9 87 465 5 32 15 27 21 55 940 — — 06128/96 987 709 2 78 <0 5 <0 5 <0 5 <05 <50 — — 09/30/96 9 87 1028 -041 1 0 <0 5 <0 5 <0 5 190 — — 12/17/96 987 924 063 4 8 0 6 <0 5 1 7 300 — 03/25/97 9 87 4 13 574 5 2 <0 5 <0 5 1 9 140 — 06/25/97 987 7 94 1 93 <05 <0 5 <0 5 20 670 — — 09/18/97 9 87 11 10 -123 2 0 <05 <05 <05 220 — <MDLS 12/16/97 9 87 1014 -027 0 7 <0 5 <05 <0 5 160 — 03/20/98 9 87 358 629 <0 5 <0 5 <0 5 <0 5 150 — — 06/30/98 987 560 427 1 2 <0 50 <0 50 063 85 — — -- 09/29/98 9 87 1069 -082 1 1 067 <0 50 21 170 — — <1 000 12/23/98 9 87 962 025 1 0 0 56 <0 50 0 86 140 <2 5 — -- 04/05199 987 7 88 1 99 <0 5 <0 5 <05 <05 110 <5 0 -- 07/09/99 9 87 944 043 <0 5 <0 5 <0 5 <0 5 <50 <2 5 -- - 10/07/99 987 11 25 -138 <0 500 <0 500 <0 500 <0 500 <50 0 -- — - 12I28/99 9 87 1042 -056 <0 500 <0 500 <0 500 <0 500 <50 0 — 03/21/00 987 7 80 207 <0 500 <0 500 <0 500 <0 500 <50 0 <2 50 — - 07/13/00 987 939 048 <0 500 <0 500 <0 500 <0 500 <50 — - — 09/27/00 9 87 1080 -0 93 <0 5 <05 <05 <05 <50 -- <MDLs - 12/20/00 967 1062 -075 <0 5 <0 5 <0 5 <05 <50 <5 0 -- 03/29/01 9 87 964 023 <0 5 <0 5 <0 5 <0 5 <50 <50 — - 06/18/01 9 87 1082 -095 <0 5 <0 5 <0 5 <0 5 <50 <50 — _ 09/24/01 9 87 11 94 -207 <0 5 <0 5 <0 5 <0 5 <50 <5 0 01/15/02 9 87 10 58 -071 <0 5 <0 5 <0 5 <1 0 <50 <5 0 — 04/03102 1 987 1 9 90 L -0 03 1 <0 5 1 <0 5 1 <a:5 <1 0 <50 <5 0 — — W�62982lTABLE5 TABLEGW As(8/21/2002