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TABLE 1 SUMMARY OF GROUNDWATER MONITORING AND ANALYTICAL RESULTS Gardner Property,Thornton,CA Page 3 of 7 {measured 1n fest MSL) (Reported in ug/l) Well ID Date Wellhead Depth to G W Benzene Toluene Ethyl Xylenes I TPNg MTBE Fuel Dissoved Elev Water Elev Benzene I(EPA 8020) Oxygenates Oxygen MW3 11/06/90 1009 1258 -249 18 11 63 98 4 500 - 02/19/91 1009 11 31 -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 -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 1 49 69 <0 50 29 17 2000 - 12/27/93 987 921 066 31 29 330 460 9 300 - 03/30/94 987 821 166 -- -- -- -- -- 06124194 987 944 043 <0 50 <0 50 290 190 8 400 - 09/16/94 987 1177 -190 <0 50 11 370 230 8 300 12/21/94 987 1060 -073 12 <0 50 14 17 3 400 - 03/30/95 987 5 19 468 83 60 880 400 5 800 06/30195 987 635 352 8 1 19 <0 50 15 610 09/29/95 987 952 035 22 14 22 19 1900 12/29/95 987 883 1 04 36 <0 50 <0 50 29 480 - - 03/29/96 987 455 532 15 27 21 55 940 06/28/96 9 87 709 278 <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 - - 03/25l97 987 413 574 52 <0 5 <0 5 1 9 140 - 06/25/97 987 794 1 93 <0 5 <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 <0 5 160 - 03/20/98 987 358 629 <0 5 <0 5 <0 5 <0 5 150 06/30/98 987 560 4 27 1 2 <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 1 0 056 <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 <0 5 <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 -- 03121/00 987 780 207 <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 -- - 09/27/00 987 1 1080_1 0 931 <0 5 1 <0 5 1 <0 L_L <0 5 <50 <MDLs W M58ZTA8LE%T.hi.gw 1102612000]