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s TA61 • 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 D1PE ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug/L) (u /L) (uglL) (ug1L) (ug1L) ug/L) (uglL) (u 1L) (ug/L) (ug1L) (u !L) (uglL) (u !L) (ug1L) (feet) (feet sea level) (feet sea leve!) Comments MW-3 03131/98 780 22 2 32 7 <5 0 na n8 na no no na no no 4827 2138 2689 screened 46110/98 220 26 18 056 18 <5 0 no no na na na no no na 4267 2129 interval 09108/98 3800 420 180 260 280 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 na no 4721 2583 etroleurn 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 12130198 620 18 099 17 14 <50 no na na na no no no na 4556 -2491 slight odor I no sheen 03126/99 63 <0 50 <0 50 <0 50 <0 50 <0 50 <0 54 <0 50 <0 50 56 <50 <5 0 no no 4126 2061 slight odor 1 no sheen 06/02/99 74 1 7 1 3 23 078 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 31 <0 50 4076 2011 slight odor 1 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 12/09/99 <50 1 7 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 12 <0 50 4722 2657 0212110D 1600 160 350 43 140 <0 50 <0 50 <0 50 <0 50 <5 0 <50 t0 14 64 4569 2504 slight odor I no sheen 05/18/00 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 no no 4087 2022 no odor 1 no sheen D9126100 270 02 28 15 16 <50 na no na no na no no na 4899 2834 no odor I no sheen 12121100 830 45 19 45 <0 50 <5 0 na na na no na na na no 4759 2694 slight odor 1 no sheen 03/27101 280 6 096 072 25 <50 no na no no no na na no 4654 2589 slight odor 1 no sheen 06/26101 2900 270 55 160 330 <0 50 <0 50 <0 50 <0 50 56 <50 <50 12 <0 50 4953 2888 slight odor I no sheen 09/05/01 18000 2700 2000 860 2200 <25 no no na na no no no na 5431 -3366 slight odor 1 no sheen 11/30/01 3500 550 23 100 270 <25 no no na no na no na na 5393 -3334 no odor Ino sheen 02/27/02 290 73 36 44 37 <50 no na no na na no no no 5080 3021 no odor 1 no sheen 05/16/02 350 42 26 7 1 10 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 89 <0 50 5098 2222 2876 no odor I no sheen 09/13/02 23000 3300 1600 12DU 3200 <5 0 no no na na no no na na 5917 3695 odor lno sheen 12104/02 2000 340 42 20 74 <20 no no na no no no no na 5725 3503 odor 1 no sheen 02/17/03 1100 51 11 17 45 <0 50 no no na na no no na no 5427 3205 no odor 1 no sheen 06/03103 1400 100 92 51 77 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 14 <0 50 5379 3157 no odor I no sheen 09118/03 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 02/23/04 720 33 37 20 30 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 29 <0 50 5523 3301 odor 1 no sheen 06/07/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5565 3343 not sampled 09107!04 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 03/09105 760 50 61 42 49 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 30 <0 50 56 10 3388 odor 1 no sheen 419gmrU5 AS Project No 141948 Page 3 of 13 HORIZON ENVIRONMENTAL INC