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TABLE 1 SUMMARY OF GROUNDWATER MONITORING AND ANALYTICAL RESULTS Gardner Property,Thornton,CA Page 5 of 7 (measured in feet MSL) (Reported in ug/1) Well ID Date Wellhead Depth to G W Benzene Toluene Ethyl Xylenes TPHg MTBE Fuel Dissoved Elev Water Elev Benzene (EPA 8020) Oxygenates Oxygen MW5 10/29/91 925 11 62 -237 2 1 <0 30 <0 30 <0 30 <30 - -- 03/04/92 925 963 -038 <0 5 <0 5 <0 5 <0 5 95 -- 03/13/92 925 930 -005 -- -- -- - 09/01/92 925 1239 -314 <0 5 <05 <0 5 <0 5 <50 - — 12/03/92 925 11 37 -212 <0 5 <0 5 <0 5 <0 5 <50 - -- 03/24/93 925 5 99 326 <0 5 <0 5 <0 5 <0 5 <50 -- 07/23/93 925 778 147 <0 50 <0 50 <0 50 <0 50 <50 12/27/93 925 8 61 064 -- -- -- 03/30/94 925 7 62 163 -- -- - -- - -- 06/24/94 925 8 87 038 - - 09/24/94 925 11 19 -194 — -- - 12/21/94 925 9 99 -074 -- -- -- - 03/30/95 925 4 62 4 63 <0 50 <0 50 <0 50 <0 50 <50 - -- 06/30/95 925 5 78 347 - - -- -- - 09/29/95 925 900 025 <0 50 <0 50 <0 50 <0 50 <50 — - 12/29/95 925 828 097 -- — -- - - 03/29/96 925 3 96 529 <0 5 <0 5 <0 5 <05 <50 -- 06/28/96 925 655 270 -- -- -- -- -- -_ -_ ,_ 09/30/96 925 975 -050 <0 50 <0 50 <0 50 <0 50 <50 12/17/96 925 870 055 - -- 03/25/97 925 3 55 570 <0 50 <0 50 <0 50 <0 50 <50 - -- 06/25/97 925 742 1 83 - 09/18/97 925 1058 -1 33 <0 5 <0 5 <0 5 <0 5 <50 -- <MDLs - 12/16/97 925 9 62 -037 - - — - - 03/20/98 925 2 98 627 <0 5 <0 5 <0 5 <2 <50 <5 -- 06/30/98 925 503 422 - - -- -- 09/29/98 9 25 1007 -082 <0 50 <0 50 <0 50 <0 50 <50 -- <1 000 12/23/98 925 905 020 — -- -- 04/05/99 925 728 1 97 <0 50 <0 50 <0 50 <0 50 <50 0 <5 0 - -- 07/09/99 925 8 87 038 -- - -- -- 10/07/99 925 1070 -1 45 <0 500 <0 500 <0 500 <0 500 <50 0 12/28/99 925 989 -064 - - -- 03/21/00 925 724 201 <0 500 <0 500 <0 500 <0 500 <50 0 <2 50 -- 07/13/00 925 888 037 - -- -- 109/27/001 925 1 10 27 -1 021 <0 5 1 <0 5 1 <0 5 1 <0 5 1 <50 I <MDLs W18256211,11M SITaWeg j1pfXWOGi