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TABLE 1 GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road,Stockton,California ethyl Depth to FOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date u IL u IL u A- u R u u u IL (u IL u ✓L (uSIL) u L u !L [U21) u IL feet feet sea levet feet sea level Comments MW 3 03/31198 780 22 2 32 7 <5 0 no no no no no na no no 4827 21 38 26891 screened 06/10198 220 26 1 a 056 18 <5 0 no no no na no no no na 4267 2129 interval 09108!98 3800 420 180 260 280 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 no no 4721 25 83 etroleum odor 1 no sheen 65 85 11/12/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2065 wellhead survey 12/36198 620 18 099 17 14 <50 na no no no no na no no 4556 2491 slight odor I no sheen 03/26199 63 4 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 56 <50 <5 0 no na 4126 2061 slight odor f no sheen 06102M 74 17 13 23 078 <0 50 <D 50 <0 50 <0 50 <50 <50 <50 31 <0 50 4076 2011 slight odor I no sheen 08131199 3000 270 120 260 25D <0 50 <0 50 <0 50 -050 59 <50 <50 48 <0 50 4570 2505 no comment 12/09199 <50 1 7 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 56 <50 <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!no sheen 05118100 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5o <50 <5 0 no na 4087 2022 no odor 1 no sheen 09/26100 270 92 28 15 16 <5 0 no no no no no no no no 4899 2834 no odor 1 no sheen 12/21100 830 45 1 9 45 <0 50 -50 no no na na no no no no 4769 2694 slight odor 1 no sheen 03127101 280 6 096 072 25 <5 0 no no no no no no no no 4654 2589 slight odor I no sheen 06/26101 2900 270 55 160 330 <0 50 <0 50 <0 50 <0 50 56 <50 <5 0 12 <0 50 4953 2888 slight odor 1 no sheen 09105701 18000 2700 2000 860 2200 <25 no no no no no no no no 5431 3366 slight odor 1 no sheen 11/30/01 3500 550 23 100 270 <25 no no na no no na no no 5393 3334 no odor)no sheen 02/27102 290 73 36 44 37 <5 0 no no no no no no no no 50 80 3021 no odor 1 no sheen 05/16102 350 42 26 71 10 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 89 <0 50 5098 2222 2876 no odor 7 no sheen 09/13102 23000 3300 1600 1200 3200 <5 0 no no no no no na no no 5917 3695 odor 1 no sheen 12/04102 2000 340 42 20 74 <20 no no no no no no no no 5725 3503 odor 1 no sheen 02717103 1100 51 11 17 45 <0 50 no no na na no no no no 5427 3205 no odor 1 no sheen 06103103 1400 100 92 51 77 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 14 <0 50 5379 31 57 no odor 1 no sheen 09/18163 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 3651 not sampled 02123104 720 33 37 20 30 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 29 <0 5D 5523 3301 odor 1 no sheen 06107/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5555 3343 not sampled 09107104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6214 3992 not sampled 12/10/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5974 3752 not sampled 03/09/05 760 50 61 42 49 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 30 <0 50 5610 3388 odor 1 no sheen 05/24/05 ns ns ns ns no ns ns ns ns ns ns ns ns ns 51 21 2899 not sampled 08/31/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5645 3423 not sampled 1r%W No� PPJ*13 HORIZON BNVIROSAL INC r