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TABLE 7 SUMMARY OF GROUNDWATER MONITORING AND ANALYTICAL RESULTS Gardner Property,Thornton,CA Page 3 of 7 measured in feet MSL Re orted in u /1) PWW311106190 Date Wellhead Depth to G W Benzene Toluene Ethyl Xylenes TPHg MTBE Fuel Dissoved Elev Water Elev Benzene EPA 8020 oxygenates Ox en 10 09 1268 -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 9 87 1020 -033 31 17 68 52 17,000 - - 03/13/92 9 87 986 001 -- -- -- -- — -- — 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 9 87 658 329 230 25 45 68 13 000 -- — 07/23/93 9 87 838 149 69 <0 50 29 17 2000 -- — 12/27/93 987 921 066 31 29 330 460 9 300 03/30/94 9 87 821 166 -- — — -- -- — - 06/24194 9 87 944 043 <0 50 <0 50 290 190 8 400 — — 09/16/94 9 87 11 77 -190 <0 50 11 370 230 8 300 — - 12/21/94 987 1060 -073 12 <0 50 14 17 3 400 — t ' 03/30/95 987 5 19 468 [ 83 60 BBV 40u 5 ao0 — — 06/30/95 987 635 352 81 19 <0 50 15 610 — — 09/29/95 987 952 035 22 14 22 19 1 900 — 12/29/95 9 87 883 104 36 <0 50 <0 50 29 460 — - 03129/96 987 455 532 15 2 7 21 55 940 - 06/28196 987 709 275 <0 5 <0 5 <05 <0 5 <50 09/30/96 9 87 1028 -041 1 0 <0 5 <0 5 <0 5 190 -- — 12/17/96 9 87 924 063 48 06 <0 5 1 7 300 -- 03/25/97 9 87 413 574 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 1110 -123 20 <0 5 <05 <0 5 220 -- <MDLs 12/16/97 987 1014 -027 07 <05 <05 <0 5 160 -- 03/20/98 987 358 629 <0 5 <0 5 <05 <0 5 150 -- — 06/30/98 987 560 427 1 2 '4050 <0 50 063 85 — -- 09/29/96 987 1069 082 1 1 067 <050 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 <05 <0 5 <05 <0 5 110 <5 0 07/09/99 987 944 043 <05 <0 5 <05 <0 5 <50 <2 5 — 10/07/99 987 11 25 -1 3B <0 500 <0500 <0 500 <0 500 <50 0 -- 12128199 987 1042 -055 <0 500 <0 500 <0 500 <0 500 <50 0 — — 03/21100 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 9 87 1080 -093 <0 5 <0 5 <0 5 <0 5 <50 — <MDLs -- 12120/00 9 87 1062 -075 <05 <05 <0 5 <0 5 <50 <5 0 — — 03/29/01 987 964 023 <0 5 <0 5 <05 <0 5 <50 <5 0 06/18/01 987 1082 -095 <0 5 <0 5 <05 <05 <50 <50 — 09/24/01 987 11 94 -207 <0 5 <0 5 <0 5 <0 5 <50 <50 N = 01/15/02 987 1058 071 <0 5 <0 5 <05 <1 0 <50 <5 0 04/03102 9 87 1 9 90 1 003 1 <05 1 <05 <05 1 <1 0 1 <50 I <5 0 — W\62582\TABLESITABLEGW d1 [SaIaMl