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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) (Reported in ug/l) Well ID Date Wellhea Depth to GW Benzene Toluene Ethyl Xylenes TPHgMTBE Fuel D[ssoved Elev Water Elev Benzene {EPA 8020)IOxygenatesi Oxygen MW3 11lOfi/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 3 0 83 7,400 -- -- -- 10/29l91 9 87 1219 -232 -- — __ _ __ - 03l04/92 987 1020 -033 31 17 68 52 17,000 -- - -- 03/13/92 9 87 986 0 01 -- -- __ _ — 09/01/92 987 1302 -315 27 11 39 10 4,100 -- -- -- 12/03l92 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 2,000 -- - -- 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 1177 -1 90 <0 50 11 370 230 8,300 — -- -- 12/21/94 9 87 1060 -073 12 <0 50 14 17 3,400 -- . 03/30/95 9 87 519 4 68 83 60 880 400 5,800 — — — 06/30l95 987 635 352 81 1 9 <0 50 15 610 — 09/29/95 987 952 0 35 22 1 4 22 19 1,900 -- -- — 12/29/95 9 87 883 104 36 <0 50 <0 50 2 9 480 -- -- 03/29/96 987 455 532 15 2 7 21 5 5 940 06/28/96 987 7 09 278 <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 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 06/25/97 987 794 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 1014 -027 0 7 <0 5 <0 5 <0 5 160 -- — -_ 03/20/98 987 358 629 <0 5 <0 5 <0 5 <0 5 150 -- -- -- 06/30/98 987 560 427 1 2 <0 50 <0 50 0 63 85 -- -- -- 09/29/98 987 1069 -082 1 1 067 <0 50 2 1 170 -- — <1,000 12/23/98 987 962 025 1 0 0 56 <0 50 086 140 <2 5 -- -- D4/05/99 987 788 1 99 <0 5 <05 <05 <05 110 <5 0 -- -_ W M5821TABLES%Tab1egw[8125189[