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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 /1 Well ID Date Wellhead Depth to G W Benzene Toluene Ethyl Xylenes TPHg MTBE Fuel Dissoved Elev Water Dev Benzene EPA 8020 Oxygenates Oxygen MW3 11/06/90 1009 1258 -249 18 11 63 98 4 500 -- 02/19/91 1009 1131 -122 270 15 60 110 4 400 10/11/91 1009 1253 -244 14 21 30 83 7 400 10/29/91 987 12 19 -232 -- -- - -- 03/04/92 987 1020 -033 31 17 68 52 17 000 03/13/92 987 986 001 -- -- -- - -- 09/01/92 987 1302 -3 15 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 1 66 -- -- -- - -- 06/24/94 987 944 043 <0 50 <0 50 290 190 8 400 09/16/94 987 11 77 1 90 <0 50 11 370 230 8 300 12/21/94 987 1060 -073 12 <0 50 14 17 3 400 - 03130/95 987 5 19 468 63 60 880 400 5 800 06/30/95 967 635 352 81 1 9 <0 50 15 610 09/29/95 967 952 035 22 1 4 22 19 1 900 12/29/95 9117 8113 1 04 313 <0 50 <0 50 29 480 03/29/96 987 455 532 15 27 21 55 940 06/28/96 987 709 278 <0 5 <0 5 <0 5 <0 5 <50 09/30/96 987 1028 -041 1 0 <0 5 <0 5 <0 5 190 12/17/96 987 924 063 48 06 <0 5 1 7 300 -- 03/25/97 987 4 13 574 52 <05 <05 1 9 140 — 06/25/97 987 794 1 93 <05 <0 5 <0 5 20 670 - 09/18/97 987 11 10 -1 23 20 <0 5 <0 5 <0 5 220 <MDLs 12/16/97 987 1014 -027 07 <0 5 <0 5 <05 160 03/20/98 987 358 629 <0 5 <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 1 1 067 <0 50 21 170 -- <1 000 12/23/98 987 962 025 10 056 <0 50 086 140 <2 5 -- 04/05/99 987 788 1 99 <0 5 <0 5 <0 5 <0 5 110 <5 0 07/09/99 987 944 043 <0 5 <0 5 <0 5 <05 <50 <2 5 10/07/99 987 11 25 1 38 <0 500 <0 500 <0 500 <0 500 <50 0 -- 12/28/99 987 1042 055 <0 500 <0 500 <0 500 <0 500 <50 0 -- 03/21/00 987 780 207 <0 500 <0 500 <0 500 <0 500 <50 0 <2 50 - 07/13100 987 939 048 <0 500 <0 500 <0 500 <0 500 <50 -- 09/27/00 987 1080 -093 <0 5 <0 5 <0 5 <0 5 <50 -- <MDLs 12/20/00 987 1062 -075 <0 5 <0 5 <0 5 <0 5 <50 <5 0 03/29/01 987 964 023 <0 5 <0 5 <0 5 <0 5 <50 <5 0 . 06/18/01 987 1082 -095 <0 5 <0 5 <0 5 <0 5 <50 <50 09/24/01 987 11 94 -207 <0 5 <0 5 <0 5 <0 5 <50 <5 0 01/15/02 987 1058 -071 <0 5 <0 5 <0 5 <1 0 <50 <50 04/03/02 1 987 1 990 -0 03__L_ <0 5 1 <0 5 1 <05 1 <10 1 <50 1 <5 0 W\G25B2\TA8LES\7ABLEGW xls[8/21/2002]