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i� TABLE 1 GROUNDWATER MONITORING DATA Former Beacon Station No 12419 I2350 Waterloo Road,Stockton,California I ethyl- Depth to TOC GW Well TPH9 benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date u IL u IL All-) u u 1L u u R u 11 u 1L u 1L u !G u 1L u u !L feet feet sea leve! feet sea level Comments MW 3 03/34/98 780 22 2 32 7 <50a no na na na na no no 4827 2138 26 89 screened 06110198 220 26 48 056 16 <50 Ina no no na na na na no 4267 2129 Interval 09!08198 3800 420 180 260 280 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 no no 4721 2583 etroleum odor 1 no sheen 65 85 11!12198 ns ns ns as ns ns 'n' ns ns ns ns ns ns 2065 wellhead survey 12!30198 620 18 099 17 14 <5 0 Ina no na na na no na no 4556 2491 slight odor 1 no sheen 03126!99 63 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 56 <50 <5 0 na no 41 26 2061 slight odor!no sheen 06102199 74 1 7 13 23 078 <0 50 <0 50 <Q 50 <0 50 <5 0 <60 <5 0 31 <0 50 4076 2011 slight odor!no sheen 08131!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 42!09199 <50 1 7 <0 50 c0 50 <4 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 12 <0 50 4722 2657 02121/00 1600 160 350 43 140 <0 50 <0 50 <0 50 <0 50 <50 <50 10 14 64 4569 2504 slight odor 1 no sheen 05118MO <50 <0 50 4050 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 no no 4087 2022 no odorno sheen 09126/00 270 92 28 15 46 <5 0 Fna na no no no no na na 4899 2834 no odor!no sheen 12121/00 830 45 19 45 <0 50 <5 0 Ina na no na na no na no 4759 2694 slight odor 1 no sheen r 03/27/05 2806 096 072 25 <5 0 'no na no na na no na no 4654 2589 slight odor J no sheen I 06/26/01 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 ' 09/05101 18000 2700 2000 860 2200 X25 Ina no no no na no na no 5431 3366 slight odor 1 no sheen 11130101 3500 550 23 100 270 X25 Ina no no na na na no no 5393 3334 no odor!no sheen 02/27102 290 73 30 44 37 <5 0 'no na ria na na na no na 5080 3021 no odorno sheen 05!16/02 350 42 26 71 t0 <0 50 <0 50150 0 <450 <o 50 <50 <50 .50 89 <0 50 5098 2222 2876 no odor!no sheen 09113!02 23000 3300 1600 1200 3200 <5 0 Ina ina no na na no na no 5917 3695 odor!no sheen 12/04102 2000 340 42 20 74 <20 Ina na na na no no na na 5725 3503 odor 1 no sheen 02117103 1100 51 11 17 45 <0 50 no no no no na na no no 5427 3205 no odor)no sheen 06/03103 1400 100 02 51 77 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 14 <0 50 5379 31 57 no odor!no sheen 09118143 ns ns ns ns ns ns Ins nu s ns ns ns ns ns ns nm nm not sampled 11124!03 ns ns ns ns ns ns ins 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 <5 0 <50 <5 0 29 <0 50 5523 3301 odor 1 no sheen 06107104 ns Its ns ns ns ns Ins 'ns ns ns ns ns ns ns 5565 3343 not sampled 09/07/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6214 3992 not sampled 12110/04 ns ns ns ns ns ns ins ns ns ns ns ns ns ns 5974 3752 not sampled 03109105 760 50 61 42 49 <0 50 0 50 <0 50 <0 50 <5 0 <50 e60 30 <0 50 5610 3389 odor 1 no sheen 1 11 05124/05 ns ns ns ns his ns Ins ns ns ns ns ns ns ns 5121 -2899 not sampled 08/31105 ns ns ns ns ns ins �ns ,Is ns ns ns ns ns ns 6645 3423 not sampled I t 1 � � I i l I II 411os r Prgecl Wo' I Pie 13 HORIZON ENVIRO AL INC I I if i