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TABLE 1 SUMMARY OF GROUNDWATER MONITORING AND ANALYTICAL RESULTS Gardner Property,Thornton,CA Page 4 of 7 measured in feet MSL Re orted in ug/1) Well ID Date Wellhead Depth to G W Benzene Toluene Ethyl Xylenes TPHg MTBE Fuel Drsso,.ed Elev Water Elev Benzene EPA 8020 Ox enates Oxygen MVV4 10/29/91 895 1130 -235 110 79 640 1 700 19 000 -- 03/04/92 903 934 -031 1 2 32 91 38 3 700 03/13/92 903 900 003 - - -- - - 09/01192 903 1216 -313 38 80 1 100 590 40 Ooa — — 12/03/92 903 11 10 207 26 110 490 1 100 15,000 - - 03/24/93 903 573 330 72 19 56 190 7,100 - -- 07/23/93 9 03 754 149 <0 50 <0 50 540 140 3,100 - 12/27/93 903 836 067 <0 50 76 700 840 15,000 - - 03/30/94 903 738 165 -- -- -- - -- 06/24/94 903 859 044 <0 50 <0 50 780 1200 16 000 - - 09116/94 903 1092 -1 89 <0 50 <0 50 240 200 2 800 - 12/21/94 903 975 -072 -.050 13 330 270 7 000 - _ - 03/30/95 903 436 467 47 23 80 13 2 100 - 06/30/95 903 553 350 38 47 270 300 12,000 - - 09/29/95 903 875 028 10 15 240 280 8,800 - 12/29/95 903 803 1 00 66 30 380 420 11 000 03/29/96 903 377 526 18 16 220 110 8 600 - - 06/28/96 903 630 273 34 42 140 100 8200 - 09/30/96 903 944 -041 24 28 470 540 10 000 - 12117/96 903 844 059 21 28 390 520 9 600 - -- 03125197 903 337 566 34 24 180 210 9200 06125/97 903 710 1 93 12 23 230 240 7 800 - 09/18/97 903 1030 -1 27 38 32 10 550 9 900 - <MDLs 12/16/97 903 934 -031 28 10 420 510 6200 - 03l20/98 903 283 620 26 23 170 110 4 400 30 06/30/98 903 481 422 13 <10 230 150 4 600 - <MDLs -- 09/29/98 903 992 -089 59 <50 42 41 1 600 - - <1 000 12/23/98 903 883 020 12 48 78 23 3 000 <10 - 04105/99 903 711 1 92 6 13 <5 0 508 175 2 650 <50 0 -- 07/09/99 903 864 039 <10 <10 <10 37 2 500 <50 0 - 10/07/99 903 1046 -143 11 1 11 3 575 646 2 700 - - 12/28/99 903 960 -057 <100 <10 0 847 102 4 920 - - 03/21/00 903 703 200 <0 500 257 202 943 2200 <2 50 - 07113/00 903 862 041 <0 500 0 661 192 393 704 -- - 09/27/00 903 1001 -098 <1 0 74 84 51 6 000 -- <MDLs - 12/20/00 903 983 -080 94 82 77 41 7 600 <50 - - 03/29/01 903 885 018 10 84 65 23 3 400 <2 0- 06/18101 903 1002 -099 12 94 170 52 7 500 34 - 09/24/01 903 11 14 -2 11 69 14 140 140 5 400 <10 - 01/15/02 903 978 -075 18 15 71 180 5 600 <2 0" <MDLs - 04/03102 903 1 911 -0 08 fi 5 L__6 7 93 1 49 1 5,700 1 <2 0" <MDLs - W\625821TABLE55TABLEGW xis[VZ112=1