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. TABL! GROUNDWATER M01RfORING DATA Former Beacon Station No 12419 2350 Waterloo Road,Stockton,California ethyl Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (uglL) (uglL) (uglL) (uglL) (ug1L) (ugly (ug1L) (uglL) (uglL) (ug1L) (uglL) (uglL) (ug/L) (uglL) (feet) (feet sea level) (feet sea level) Comments MW 3 03131!98 780 22 2 32 7 <5 0 na na na na na na na na 4827 21 38 2689 screened 06/10/98 220 26 18 056 1 8 <50 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 <5 0 <50 <5 0 na na 4721 25 63 Petroleum odor 1 no sheen 65 85 11/12198 ns As ns ns ns ns ns ns ns ns ns ns ns ns 2065 wellhead survey 12/30198 620 18 099 17 1 4 <5 0 na na na na na na na na 4556 2491 slight odor 1 no sheen 03/26199 63 <0 50 <0 50 <0 50 <0 50 4 50 <0 50 <0 50 <0 50 56 <50 <50 na na 41 26 2061 slight odor 1 no sheen 06102!99 74 17 13 23 078 <0 50 <0 50 4 50 <0 50 <5 0 <50 <5 0 31 <0 50 4076 2011 slight odor 1 no sheen 08/31199 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 1 7 <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 1 no sheen 05/18/00 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 na na 4087 2022 no odor 1 no sheen 09/26/00 270 92 28 15 16 <5 0 na na na na na na na na 4899 2834 no odor 1 no sheen 12/21100 830 45 19 45 <0 50 <5 0 na na na na na na na na 4759 2694 slight odor I no sheen 03/27/01 280 6 0 96 072 25 <5 0 na na na na na na na na 4654 2589 slight odor/no sheen 06126!01 2900 270 55 160 330 <0 50 <0 50 <0 50 <0 50 5 6 <50 <5 0 12 <0 50 4953 2888 slight odor 1 no sheen 09/05101 18000 2700 2000 860 2200 <25 na na na na na na na na 5431 3366 slight odor 1 no sheen 11/30101 3500 550 23 100 270 <25 na na na na na na na na 5393 3334 no odor 1 no sheen 02/27102 290 73 36 44 37 <5 0 na na na na na na na na 5080 3021 no odor 1 no sheen 05/16/02 350 42 26 71 to <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 89 <0 50 5090 2222 2876 no odor 1 no sheen 09/13/02 23000 3300 1600 1200 3200 <5 0 na na na na na na na na 5917 3695 odor lno sheen 12/04/02 2000 340 42 20 74 <20 na na na na na na na na 5725 3503 odor Ino sheen 02/17/03 1100 51 11 17 45 <0 50 na na na na na na na na 5427 3205 no odor Ino sheen 06/03/03 1400 100 92 51 77 <0 50 <0 50 4 50 <0 50 <5 0 <50 <5 0 14 <0 50 5379 31 57 no odor 1 no sheen 09118/03 ns ns ns ns ns ns ns as ns ns ns ns ns ns nm nm not sampled I W4103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5873 3651 not sampled 02/23/04 720 33 37 20 30 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 29 -050 5523 3301 odor 1 no sheen 06/07/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5565 33 43 not sampled 09/07104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6214 3992 not sampled 12/10104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5974 3752 not sampled 419gmfD4 xis Prgecl No 141947 Page 3 of 13 HORIZON ENVIRONNENTAL INC