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To 1 0 r 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 (ug/L) (ug/L) (ug/L) (ug/L) (ugIL) (ug1L) (ug/L) (ug1L) (ug/L) (ug/L) (ug1L) (ug/L) (ug1L) (ugIL) (feet) (feet sea level) (feet sea level) Comments MW 9 11112!98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2065 wellhead survey screened 12130/98 1500 73 18 160 64 <25 0 no no na na no na no na 4559 -2494 slight odor 1 no sheen interval 03!26199 1300 54 58 110 15 <0 50 <0 50 <0 50 <0 50 11 <50 <5 0 na na 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 <5 0 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 9 3 <50 <5 0 42 <0 50 062 -2497 no comment 12/09/99 1600 86 65 200 62 079 <0 50 <0 50 <0 50 10 <50 <5 0 13 <0 50 4726 2661 02/21/00 1900 50 18 100 60 055 <0 50 <0 50 <0 50 10 <50 B 8 9 5 <0 50 4581 25 16 slight odor I no sheen 05116!00 790 96 081 76 21 <0 50 <0 50 <0 50 <0 50 12 <50 <50 no no 4089 2024 slight odor 1 no sheen 09126100 680 1 1 <0 50 31 087 <5 0 no na no no no na na no 4895 28 30 slight odor 1 no sheen 12121100 1400 16 1 1 40 120 <5 0 no na no na no na na no 4762 -2697 slight odor 1 no sheen 03127/01 1700 61 14 23 220 <5 0 no no no na no no no na 4637 2672 slight odor!no sheen 06!26!01 390 51 065 44 27 <0 50 <0 50 <0 50 <0 50 8 5 <50 <5 0 68 <0 50 4899 28 34 slight odor!no sheen 09/05/01 410 1 1 <0 50 <0 50 46 <5 0 no na no no na na no na 5411 3346 no odor I no sheen 11/30101 750 72 14 31 15 <5 0 no no na na na na no na 54 11 3346 no odor I no sheen 02/27/02 850 12 35 1 4 23 <5 0 no na na no na no na no 5078 30 13 no odor 1 no sheen 05/16/02 1100 72 1 0 3 1 67 <0 50 <0 50 <0 50 <0 50 58 <50 <5 0 12 <0 50 5092 2221 2871 no odor I no sheen 09/13/02 2800 110 33 130 200 <5 0 not no no na na na na no 5908 -3687 slight odor 1 no sheen 12!04/02 989 31 15 21 39 <5 0 no no na no na no na no 6734 35 13 odor lno sheen 02/17/03 900 20 1 4 4 2 26 <0 50 no na no na no no no no 5408 31 87 no odor 1 no sheen 06103103 2800 140 1 7 130 120 <0 50 <0 50 <0 50 <0 50 58 <50 <5 0 15 <0 50 5347 31 26 no odor 1 no sheen 09118/03 2800 430 23 79 170 <5 0 na no na na na no no na 5991 3770 no odor I no sheen 11/24/03 1800 190 27 19 76 <0 50 ne no no na no na na no 5866 -3645 no odor I no sheen 02/23/04 1200 40 075 77 59 <0 50 <0 50 <0 50 <0 50 67 <50 <5 0 26 <0 50 55 15 3294 odor I no sheen 06/07/04 2200 420 57 44 92 <10 no na no no no no no no 5557 33 36 odor lno sheen 09/07/04 1800 230 25 51 140 <1 5 no na no no no no no no 61 96 -3975 odor lno sheen 419gmfO4-is Project No 1419 47 Page 9 0!13 HORIZON ENVIRONMENTAL INC