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• To 1 f GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road,Stockton,California ethyl Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE RIPE ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug1L) (uglL) (ug1L) (uglL) (uglL) (uglL) (ug/L) (uglL) (ug1L) (ug1L) (ugll-) (ug1L) (ug1L) (uglL) (feet) (feet sea level) (feet sea lever Comments MW 7 11112/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2055 wellhead survey screened 12130/98 340 48 1 74 22 <5 0 no no no no no no na no 4543 + 2488 no odor/no sheen interval 03/26199 550 94 <0 50 <0 5o <0 50 <0 50 <0 50 <0 50 <0 50 23 <50 <5 0 no na 41 33 2078 no odor 1 no sheen 41 -66 06/02/99 230 <0 50 <0 50 <0 50 <0 50 1 1 <0 50 <0 50 <0 50 28 <50 <5 0 270 <0 50 4076 2021 no odor 1 no sheen 08/31/99 120 <0 50 <0 50 <0 50 <0 50 1 2 <0 50 <0 50 <0 50 13 <50 <5 0 160 <0 50 4556 2501 no comment 12/09/99 130 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 98 <0 50 4714 2659 02/21100 130 40 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 84 <50 <5 0 96 <0 50 4556 -2501 no odor 1 no sheen 05/18/00 120 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 68 <50 <50 no no 4078 2023 no odor 1 no sheen 09/26/00 68 <0 50 <0 50 <0 50 <0 50 <5 0 na no no na no no no no 4889 2834 no odor/no sheen 12/20/00 87 <0 50 <0 50 <0 50 <0 50 <5 0 na no na na no no na na 4751 2696 no odor!no sheen 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 4637 2562 no odor!no sheen 06!26101 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 33 <0 50 4903 2848 no odor 1 no sheen 09/05/01 68 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 54 06 -3351 no odor 1 no sheen 11130/01 97 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 5401 -3346 no odor I no sheen 02126/02 66 <0 50 <0 50 <0 50 <0 50 <5 0 na no no no no na na no 5065 30 10 no odor 1 no sheen 05/16/02 87 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 26 <0 50 5071 2211 2860 no odor 1 no sheen 09112/02 77 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no na $873 3662 no odor 1 no sheen 12/04102 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no na no no no no no na 5724 35 13 no odor!no sheen 02/17/03 <50 <0 50 <0 50 <0 50 <0 50 <0 5o no no no no no no na no 5408 31 97 no odor!no sheen 06/02/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 16 <0 50 5331 31 20 no odor!no sheen 09/18/03 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na no no na no 5963 3752 no odor!no sheen 11/24/03 AS ns ns ns ns ns ns ns ns ns ns ns ns ns 5844 -3633 not sampled 02/23104 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 o <50 12 70 <0 50 5497 -3286 no odor 1 no sheen 06/07/04 ns ns ns ns ns ns as ns ns ns ns ns ns ns 5517 -3306 not sampled 09/07/04 <50 <0 50 <0 50 <0 50 <0 50 070 no no no na no no no no 6062 -3851 no odor 1 no sheen 419gmrD4 xis Protect No 141947 Page 7 of 13 HORIZON ENVIRONMENTAL INC