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TABLE 1 SUMMARY OF GROUNDWATER MONITORING AND ANALYTICAL RESULTS Gardner Property,Thornton,CA • Page 3af7 (measured in feet MSL) (Reported in ug/1) Well ID Date Wellhead Depth to G W Benzene I Toluene Ethyl Xylenes TPHg MTBE Fuel Dissoved Elev Water Elev I Benzene I I(EPA 8020)1 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 10 09 1253 -244 14 21 30 83 7 400 - -- -- 10/29/91 9 87 12 19 -232 -- -- -- -- — 03/04/92 987 1020 -033 31 17 68 52 17 000 - -- - 03/13/92 987 9 86 0 01 -- -- -- -- __ 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 - -- 03124/93 987 6 58 329 230 25 45 68 13 000 -- - 07/23/93 9 87 838 1 49 69 <0 50 29 17 2000 - -- - 12/27/93 987 921 066 31 29 330 460 9 300 03/30/94 9 87 8 21 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 -- - -- 03/30/95 987 5 19 4 68 83 60 880 400 5 800 -- -- • 06/30/95 987 635 3 52 8 1 1 9 <0 50 15 610 == - 09/29/95 9 87 9 52 035 22 1 4 22 19 1 900 12/29/95 9 87 8 83 1 04 3 6 <0 50 <0 50 2 9 480 -- -- 03/29/96 9 87 4 55 532 15 2 7 2 1 5 5 940 - — - 06/28/96 987 7 09 2 78 <0 5 <0 5 <0 5 <0 5 <50 -- - 09/30/96 9 87 1028 -0 41 1 0 <0 5 <0 5 <0 5 190 — -- -- 12/17/96 9 87 924 063 4 8 0 6 <0 5 1 7 300 -- - 03/25/97 987 413 574 5 2 <0 5 <0 5 1 9 140 - 06/25/97 987 7 94 1 93 <0 5 <0 5 <0 5 2 0 670 -- - 09/18/97 987 11 10 -1 23 2 0 <0 5 <0 5 <0 5 220 - <MDLs -- 12/16/97 987 10 14 -027 0 7 <0 5 <0 5 <0 5 160 -- 03/20/98 9 87 358 629 <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 9 87 1069 0 82 1 1 067 <0 50 2 1 170 <1 000 12/23/98 9 87 962 025 1 0 0 56 <0 50 0 86 140 <2 5 -- -- 04/05/99 9 87 7 88 1 99 <0 5 <o 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 9 87 1042 -0 55 <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 -- - 09/27/00 987 1080 -0 93 <0 5 <0 5 <0 5 <0 5 <50 -- <MDLsIL - 12/20/00 987 10 62 -0 75 <0 5 <0 5 <0 5 <0 5 <50 <5 0 L03/29/0111 9 87 L__!!L 023 <0 5 <0 5 <0 5 <o 5 <5o <5 0 - -- W16258ZT/BLMTg8LEGW A.(04ROf1W1)