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TA& r T GROUNDWATER MONITORING DATA Former Beacon Station No 12449 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 (ug1L) (uglL) (ug1L) (uglL) (ug1L) (uglL) (ug1L) (uglL) (ug1L) (ug/L) (uglL) (ug1L) (ug/L) (uglL) (feet) (feet sea level) (feet sea level) Comments MW-3 03/31/98 780 22 2 32 7 <5 0 no no no no no no na no 4827 2138 2689 screened 06110/98 220 26 18 056 1 8 <5 0 no no no na no no no no 4267 2129 interval 09/08/98 3800 420 180 260 280 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 no no 4721 2583 etroleum odor!no sheen 65 -85 11/12/98 i ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2065 wellhead survey 12!30198 620 18 099 17 14 <5 0 no na no no no no no na 4556 2491 slight odor!no sheen 03/26/99 63 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 56 <50 <5 0 no no 4126 -2061 slight odor/no sheen 06/02/99 74 17 1 3 23 078 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 31 <0 50 4076 -2011 slight odor/no sheen 08/37/99 3000 270 120 260 250 <0 50 <0 50 <0 50 <0 50 69 <50 <5 0 48 <0 50 4570 -2505 no comment 12/09/99 <50 17 <0 50 <0 50 <0 50 <o 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 12 <0 50 4722 -2657 02!21100 1600 160 350 43 140 <0 50 <0 50 <0 50 <0 50 <5 0 <50 10 14 64 4569 -2504 slight odor 1 no sheen (15118100 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na no 4087 -2022 no odor I no sheen 09/26100 270 92 28 15 16 <5 0 no no no no na no no no 4899 2834 no odor/no sheen 12/21100 830 45 19 45 <0 50 <5 0 no no no na na no no no 4759 2694 slight odor 1 no sheen 03/27/01 280 6 096 072 15 <5 0 na na no na na na na no 4654 2589 slight odor 1 no sheen 06/26/01 2900 270 55 160 330 <0 50 <0 50 <0 50 <0 50 56 <50 <50 12 <0 50 4953 -2888 slight odor 1 no sheen 09/05/01 18000 2700 2000 860 2200 <25 na na na no na no no na 5431 3366 slight odor I no sheen 11/30/01 3500 550 23 100 270 <25 no no no no na no no na 5393 3334 no odor Ino sheen 02/27/02 290 73 36 44 37 <5 0 no no no no no no no no 5080 3021 no odor!no sheen 05/16/02 350 42 26 7 1 10 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 89 <0 50 5098 2222 2876 no odor I no sheen 09/13/02 23000 3300 1600 1200 3200 <50 no na na no no no no na 5917 -3695 odor Ino sheen 12/04/02 2000 340 42 20 74 <20 no no na no na na no na 5725 -3503 odor 1 no sheen 02/17/03 1100 51 11 17 45 <0 50 no no no na no no no no 5427 -3205 no odor I no sheen 06/03/03 1400 100 92 51 77 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 14 <0 50 5379 -31 57 no odor I no sheen 09/18/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 11124103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5873 -3851 not sampled 02/23704 720 33 37 20 30 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 29 <0 50 5523 -3301 odor I no sheen 06/07104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5565 3343 not sampled 419ymn)4 ids PMJeCt Na 141947 Page 3 of 13 HORIZON INMONMBATAL IIfC