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i TAO • J 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 DIPS ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug1L) (ug1L) (ugIL) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug/L) (feet) (feet sea level) (feet sea level) Comments MW 3 03!31198 780 22 2 32 7 <5 0 na na ria na na na na na 4827 2138 -2689 screened 06/10/98 220 26 1 8 056 1 8 <5 0 na na na na na na na na 4267 -2129 interval 09108/98 3800 420 180 260 280 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 na na 4721 -25 B3 etroleum odor 1 no sheen 65' 85 11112!98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2065 wellhead survey 12/30/98 620 16 099 17 1 4 <5 0 na na na na na na na na 4556 -2491 slight odor I no sheen 03/26199 63 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 56 <50 <5 0 na na 4126 -2061 slight odor 1 no sheen 06/02199 74 17 13 23 078 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 31 <0 50 4076 -2011 slight odor 1 no sheen 08/31/99 3000 270 120 260 250 <0 50 <0 50 <0 50 <0 50 69 <50 <50 48 <0 50 4570 -2505 no comment 12109199 <50 17 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 12 <0 50 4722 -2657 02121100 1600 160 350 43 140 <0 50 <0 50 <0 50 <0 50 <5 0 <50 10 14 64 4569 -2504 slight odor I no sheen 05118/00 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 na na 4087 2022 no odor 1 no sheen 09/26/00 270 92 28 15 16 <50 na na na na na na na na 4899 2834 no odor 1 no sheen 12/21/00 830 45 19 45 <0 50 <5 0 na na na na na na na na 4759 2694 slight odor 1 no sheen 03127/01 280 6 098 072 25 <50 na na na na na na na na 4654 2589 slight odor 1 no sheen 06126101 2900 270 55 160 330 <0 50 <0 50 <0 50 <0 50 56 <50 <50 12 <0 50 4953 -2880 slight odor I no sheen 09/05/01 18000 2700 2000 860 2200 <25 na na na na na na na na 5431 3366 slight odor 1 no sheen 11130/01 3500 550 23 100 270 <25 na na na na na na na na 5393 3334 no odor 1 no sheen 07127/02 290 73 36 44 37 <5 0 na na na na na na na na 5080 3021 no odor!no sheen 05116/02 350 42 26 71 10 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 89 <0 50 5098 2222 2876 no odor!no sheen 09113/02 23000 3300 1600 1200 3200 <5 0 na na na na na na na na 5917 -3695 odor Ino sheen 12104/02 2000 340 42 20 74 <20 na na na na na na na na 5725 -3503 odor 1 no sheen 02117/03 1100 51 11 17 45 <0 50 na na na ne na na na na 5427 3205 no odor I no sheen 06/03103 1400 100 92 51 77 <0 50 <0 50 <0 5o <0 50 <5 0 <50 <5 0 14 <0 50 5379 3157 no odor/no sheen 09/18/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 11/24/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5873 3651 not sampled 13a � Page 3 o'13 HOMON ENVIRONMENTAL INC