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T& 1 , 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 DIPE ETBE TAME TBA methanol ethanal EDC EDB GW Elevation Elevation Number Dale (ugll-) (ug1L) (ug1L) (ugll-) (ug/L) (ug1L) (ug1L) (ugll-) (ug1L) (ug1L) (ugll-) (uglL) (ug1L) (ug1L) (feet) (feet sea level) (feet sea level) Comments MW-9 1111219a ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2065 wellhead survey screened 12/30/98 1500 73 18 160 64 <25 0 na na na na na na na na 45 59 2494 slight odor 1 no sheen interval 03/26/99 1300 54 58 110 15 <0 50 <0 50 <0 50 <0 50 11 <50 <5 0 na na 4139 20 74 no odor!no sheen 41 -66' 06/02/99 1300 16 25. 76 24 <0 50 <0 50 <0 50 <0 50 13 <50 <5 0 16 <0 50 4074 2009 no odor 1 no sheen 08/31/99 2400 140 21 460 260 055 <0 50 <0 50 <0 50 93 <50 <5 0 42 <0 50 4562 2497 no comment 12/09/99 1600 86 65 200 62 079 <0 50 <0 50 <0 50 10 <50 <5 0 1 3 <0 50 4726 2681 02/21/00 1900 50 18 100 60 055 <0 50 <0 50 <0 50 10 <50 88 95 <0 50 4581 2516 slight odor I no sheen 05/18/00 790 96 081 76 21 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 na na 4089 2024 slight odor 1 no sheen 09126/00 680 1 1 <0 50 31 087 <5 0 na na na na na na na na 4895 2830 slight odor I no sheen 12/21/00 1400 16 1 1 40 120 <50 na na na na na na na na 4762 -2697 slight odor/no sheen 03127/01 1700 61 14 23 220 <50 na na na na na na na na 4637 2572 slight odor!no sheen 06/26/01 390 51 065 44 27 <0 50 <0 50 <0 50 <0 50 85 <50 <5 0 68 <0 50 4899 2834 slight odor!no sheen 09105/01 410 1 1 <0 50 <0 50 46 <5 0 na na na na na na na na 5411 -3346 no odor I no sheen 11/30/01 750 72 14 31 15 <50 na na na na na na na na 5411 3346 no odor!no sheen 02/27102 850 12 35 14 23 <5 0 na na na na na na na na 5078 -3013 no odor 1 no sheen 05/16/02 1100 72 10 31 67 <0 50 <0 50 <0 50 <0 50 58 <50 <5 0 12 <0 50 5092 2221 2871 no odor I no sheen 09/13/02 2800 110 33 130 200 <5 0 na na na na na na na na 5908 3687 slight odor 1 no sheen MW-10 12/02/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 1 2087 wellhead survey screened 12/30/98 180 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4584 -2497 no odor/no sheen interval 03126!99 140 064 <0 50 <0 50 072 <0 50 <0 50 <0 50 <0 50 92 <50 <5 0 na na 4165 2078 no odor I no sheen 41 66 06!02!99 160 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 <50 94 <0 50 4096 2009 no odor l no sheen 08/31/99 120 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 93 <50 <50 65 <0 50 4574 -2487 no comment 12109199 56 <0 5o <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 26 <0 50 4746 -2659 no comment 02121/00 55 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 33 <0 50 4591 -2504 no odor I no sheen 05/18/00 <50 <0 50 31 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 na na 41 11 -2024 no odor/no sheen 09/26/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm well access blocked 12/20/00 <50 <0 50 70 <0 50 <0 50 <50 na na na na na na na na 4789 2702 no odor 1 no sheen 03127101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4762 2675 no odor 1 no sheen 06/26/01 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 4905 28 18 no odor I no sheen 09105/01 <50 <0 50 1 4 <0 50 <0 50 <5 0 na na na na na na na na 5405 3318 no odor I no sheen 11/30/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5437 3350 no odor 1 no sheen 02/26102 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5101 3014 no odor 1 no sheen 05/16/02 1000 10 110 22 130 270 <0 50 <0 50 25 56 <150 <50 066 <0 50 5099 2242 2857 no odor 1 no sheen 09/12/02 58 <0 50 <0 50 <0 50 <o 50 <5 0 na na na na na na na na 5891 -3649 no odor 1 no sheen 419gmrO2ids Project No 1419 45 Page 5 of 7 HORIZON ENVIRONMENTAL INC I