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To 1 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 DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (uglL) (ug1L) (uglL) (uglL) (uglL) (ug1L) (uglL) (uglL) (ug1L) (uglL) (uglL) (ug1L) (uglL) (uglL) (feet) (feet sea level) (feet sea level) Comments MW 9 11/12/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2065 wellhead survey screened 12/30/98 1500 73 18 160 64 <25 0 no no no no no no no no 4559 2494 slight odor 1 no sheen interval 03126/99 1300 54 58 110 15 <0 50 <0 50 <0 50 <0 50 11 <50 <50 no no 41 39 2074 no odor 1 no sheen 41'-66' 06102/99 1300 16 25 76 24 <0 50 <0 50 <0 50 <0 50 13 <50 <50 16 <0 50 4074 -2009 no odor 1 no sheen 08/31/99 2400 140 21 460 280 055 <0 50 <0 50 <0 50 93 <50 <50 42 <0 50 4562 -2497 no comment 12/09/99 1600 86 65 200 62 079 <0 50 <0 50 <0 50 10 <50 <50 13 <0 50 4726 2661 02/21/00 1900 50 18 100 60 055 <0 50 <0 50 <0 50 10 <50 Be 95 <0 50 4581 2516 slight odor 1 no sheen 05/18/00 790 96 061 76 21 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 no no 40 89 2024 slight odor 1 no sheen 09/26100 680 1 1 <0 50 31 087 <5 0 no no no no no na na na 4895 2830 slight odor!no sheen 12/21100 1400 16 1 1 40 120 <5 0 no no no no no no no no 4762 2697 slight odor!no sheen 03/27101 1700 61 14 23 220 <5 0 no no no no na no no no 4637 2572 slight odor/no sheen 06/26/01 390 51 065 44 27 <0 50 <0 50 <0 50 <0 50 85 <50 <5 0 68 <0 50 4899 2834 slight odor 1 no sheen 09105101 410 1 1 <0 50 <0 50 46 <5 0 no no no no no no no no 5411 3346 no odor 1 no sheen 11/30/01 750 72 1 4 31 15 <5 0 no no no no na no no no 5411 3346 no odor 1 no sheen 02/27/02 850 12 35 1 4 23 <5 0 no no no no no no no no 5078 3013 no odor 1 no sheen 05/16/02 1100 72 10 31 67 <0 50 <0 50 <0 50 <0 50 58 <50 <5 0 12 <0 50 5092 2221 2871 no odor!no sheen 09/13/02 2800 110 33 130 200 <5 0 no no no no no no no no 5908 3687 slight odor 1 no sheen 12/04/02 980 31 15 21 39 <5 0 no no no no no no na no 5734 -3513 odor 1 no sheen 02/17/03 900 20 14 42 26 <0 50 no no no no no na no no 5408 -3187 no odor 1 no sheen 06/03/03 2800 140 1 7 130 120 <0 50 <0 50 <0 50 <0 50 58 <50 <5 0 15 <0 50 5347 3126 no odor 1 no sheen 09/18/03 2800 430 23 79 170 <5 0 no no no no na no no no 5991 -3770 no odor/no sheen 11/24/03 1800 190 27 19 76 <0 50 no no no no no no no no 5866 -3645 no odor 1 no sheen I i9grniG3 Page 9 of 13 HORIZON ENVIRONMENTAL INC