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TAW 1 GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road, Stockton, California ethyl- Depth to TOCW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation El evGation Number Date (uglL) (u IL) (u IL) (u lL) (uglQ (ug1L) (ug1L) (u2l ) (u IL) (uglL) (u IL) (u IL) (u IL) (u IL) (feet) (feet sea level) (feet sea level) Comments MW 9 11112/98 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 <250 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 <050 <0 50 11 <50 <50 na na 41 39 2074 no odor 1 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!no sheen 08/31199 2400 140 21 460 260 055 <0 50 <0 50 <0 50 93 <50 <50 42 <0 50 4562 2497 no comment 12/09199 1600 86 65 200 62 079 <0 50 <0 50 <0 50 10 <50 <50 1 3 <0 50 4726 2661 02/21100 1900 50 18 100 60 055 <0 50 <050 <0 50 10 <50 11 95 <0 50 4111 -2511 slight odor l no sheen 05118/00 790 96 081 76 21 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 na na 4089 2024 slight odor l no sheen 09126100 680 1 1 <0 50 31 0 B7 <5 0 na na na na na na na na 4895 2830 slight odor l no sheen 12/21/00 1400 16 1 1 40 120 <50 na na na na na na na na 4762 2697 slight odor I no sheen 03/27101 1700 61 14 23 220 <5 0 na na na na na na na na 46 37 2172 slight odor I no sheen 06/26/01 390 5 1 065 44 27 <0 50 <0 50 <0 50 <0 50 85 <50 <50 68 <0 50 4e.09 2834 slight odor I no sheen 09/05/01 410 1 1 <0 50 <0 50 46 <5 0 na na na na na na na na 5411 -3346 no odor 1 no sheen 11/30101 750 72 14 31 15 <5 0 na na na na na na na na 5411 -3346 no odor I no sheen 02/27/02 850 12 35 14 23 <50 na na na na na na na na 5078 3013 no odor 1 no sheen 05/16/02 1100 72 1 0 31 67 <0 50 <0 50 <0 50 <0 50 58 <50 <5 0 12 <0 50 5092 2221 2871 no odor 1 no sheen 09/13102 2800 110 33 130 200 <50 na na na na na na na na 5908 3687 slight odor 1 no sheen 12/04/02 980 31 15 21 39 <50 na na na na na na na na 5734 3513 odor I no sheen MW 10 12/02/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2087 wellhead survey screened 12/30/98 180 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 45 84 2497 no odor 1 no sheen interval 03/26/99 140 064 <0 50 <0 50 072 <0 50 <0 50 <0 50 <0 50 92 <50 <50 na na 4165 2078 no odor 1 no sheen 41' 56 06/02199 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 1 no sheen 08/31199 120 <o 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 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 26 <0 50 4746 2659 no comment 02/21/00 55 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 33 <0 50 4591 -2504 no odor l no sheen 05118100 <50 <0 50 31 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na na 41 11 2024 no odorino 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 <5 0 na na na na na na na na 4789 2702 no odor I no sheen 03/27/01 <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 <50 <50 <50 <0 50 <0 50 4905 2818 no odor 1 no sheen 09/05101 <50 <0 50 14 <0 50 <0 50 <50 na na na na na na na na 5405 3318 no odor 1 no sheen 11/30101 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 5437 3350 no odor l no sheen 02/26/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5101 3014 no odor I no sheen 05/16/02 1000 10 110 22 130 270 <0 50 <0 50 25 56 <150 <5 0 066 <0 50 5099 2242 -2857 no odor I no sheen 09/12102 58 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5891 -3649 no odor 1 no sheen 12/04/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 ria na na na na na na na 5756 3514 no odor I no sheen 419gmr02 As Probed No 1419 45 Page 5 of 7 HORIZON ENVIRONDKENTAL INC