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TA 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 DIPS ETBE TAME THA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug1L) (ug1L) (uglL) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (uglL) (uglL) (ug1L) (ug1L) (feet) (feet sea level) (feet sea level) Comments MW-10 12/02/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2087 wellhead survey screened 12/30/98 100 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4584 -2497 no odor 1 no sheen interval 03/25/99 140 064 <0 50 <0 50 072 <0 50 <0 50 <0 50 <0 50 92 <50 <50 na na 41 65 2076 no odor 1 no sheen 41'-66' 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 08/31/99 120 <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 12109/99 56 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 26 <0 50 4746 2659 no comment 02/21100 55 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 33 <0 50 4591 -2504 no odor 1 no sheen 05/18100 <50 <0 50 31 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 na na 4111 2024 no odorino sheen 09/26/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm well actress 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 1 no sheen 03127/01 <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 06126101 <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 -2818 no odor 1 no sheen 09/05/01 <50 <0 50 14 <0 50 <0 50 <5 0 na na na na na na na na 5405 3318 no odor 1 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 02/26/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5101 3014 no odor 1 no sheen 05/16/02 1000 10 110 22 130 270 <0 50 <0 50 25 56 4150 <5 0 066 <0 50 5099 2242 2857 no odor I no sheen 09/12102 58 40 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 na na na na na na na na 5756 3514 no odor/no sheen 02/17103 <50 <0 50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na 5444 3202 no odor!no sheen 06/02/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 092 <0 50 5353 -31 11 no odor!no sheen 09118/03 670 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 59 B1 -3739 no odor 1 no sheen 11124/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na 5862 3620 no odor 1 no sheen 02/23/04 67 <0 50 <0 50 <0 50 <0 50 <0 50 <0 5o <0 50 <0 50 <5 0 <50 <50 1 1 <0 50 5528 3286 no odor I no sheen 419gmr04 AS Project No 141947 Page 10 of 13 HORIZON ENVIRONMENTAL INC