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h� { TABLE 1 SUMMARY OF GROUNDWATER MONITORING AND ANALYTICAL RESULTS Gardner Property,Thornton,CA Page 3 of 7 (measured in feet MSL) (Re orted rn ug/1) Well ID Date Wellhead Depth to G W Benzene Toluene Ethyl Xylenes TPHg MTBE Fuel Dissoved Elev Water Elev I Benzene (EPA 8020) Oxvaenates Ox en MW3 11/06/90 1009 1258 -249 18 11 63 98 4,500 — — 02)19l91 1009 1131 -122 270 15 6D 110 4,400 — — -- 10/11/91 1009 1253 -2 44 14 21 30 83 7,400 — — 10129/91 987 1219 -2 32 — -- — — -- - - -- 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 1196 -209 130 14 26 45 6,000 — — 03/24/93 987 658 329 230 25 45 68 13,000 — — - 07/23/93 9 87 838 149 69 <0 50 29 17 2,000 — — 12/27/93 987 921 066 31 29 330 460 9,300 — — -- 03/30/94 987 821 166 — — — — — — — -- 06124/94 9 87 944 043 <0 50 <0 50 290 190 8,400 — -- -- 09/16/94 987 1177 -190 <0 50 11 370 230 8,300 — -- 12121/94 987 1060 -073 12 <0 50 14 17 3,400 -- — 03/30/95 987 519 468 83 60 880 400 5,800 — — 06/30/95 987 635 3 52 81 19 <0 50 15 610 — — -- 09129/95 987 9 52 035 22 14 22 19 1,900 — -- -- 12/29/95 987 883 104 36 <0 50 <0 50 29 480 — — -- 03/29/96 987 455 532 15 2 7 21 55 940 -- — -- 06/28/96 987 709 2 78 <05 <0 5 <0 5 <0 5 <50 -- - -- 09/30/96 987 1028 -041 10 <0 5 <0 5 <0 5 190 — — - 12/17/96 9 87 924 063 48 06 <0 5 1 7 300 — — - 03/25/97 987 413 574 5 2 <05 <0 5 19 140 — — - 06/25/97 987 7 94 193 <0 5 <05 <0 5 20 670 — — -- 09/18/97 987 1110 -123 2 0 <05 <0 5 <0 5 220 — <M DL.s 12/16/97 987 1014 -027 0 7 <0 5 <05 <0 5 160 — — -- 03/20/98 987 358 629 <0 5 <0 5 <05 <0 5 150 — -- - 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 12123/98 1 9 87 1 9 62 1 025 10 056 <0 50 086 140 <2 5 — • W 191�C17ABLE917AgLE6W X18[11111841