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TA01 . 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 TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug1L) (ugly") (ugll-) (ug1L) (ugll-) (uglL) (ug/L) (ug1L) (ug1L) (ug1L) (ug1L) (uglL) (ugll-) (ug1L) (feet) (feet sea level) (feet sea level) Comments MW-10 12102!98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2087 wellhead surrey screened 12/30/98 180 <0 50 <0$0 <0 50 <0 50 <50 na na na na na na na na 4584 -2497 no odor!no sheen interval 03/26/99 140 064 <0 50 <0 50 072 <0 50 <0 50 <0 50 <0 50 92 <50 <5 0 na na 4165 -2078 no odor!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 <5 0 94 <0 50 4096 2009 no odor/no sheen 08131/99 120 1 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 93 <50 <5 0 65 <0 50 4574 -2487 no comment 12/09/99 56 eo 50 <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 02121100 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 25 04 no odor 1 no sheen 05/18/00 <50 <0 50 3 1 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na na 41 11 -2024 no odor/no sheen 09126100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm well access blocked 12120100 <50 <0 50 70 <0 50 <0 50 <5 0 na na na na na na na na 4789 -2702 no odor!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 I no sheen 06126/01 <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 -2818 no odor!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!no sheen ""0101 <" <0 50 <0 5o <0 50 <0 50 <5 0 na na na na na na na na 5437 -3350 no odor!no sheen 02!26102 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 51 01 -3014 no odor 1 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 09/12/02 58 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5891 -3649 no odor I no sheen 12/04/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na ns na na na 5756 3514 no odor 1 no sheen 02117103 <50 <0 50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na 5444 3202 no odor I no sheen 06/02/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 5o <0 5o <5 0 <50 <5 0 092 <0 50 5353 -31 11 n0 odor 1 no sheen 09/18/03 670 <o 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5981 -3739 no odor 1 no sheen 11/24103 <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 50 <0 50 <0 50 <50 <50 <5 0 1 1 <0 50 6628 -3286 no odor I no sheen 06/07/04 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5639 3297 no odor 1 no sheen 419gmr04)ds Pmpd No 1419 47 Page 10 of 13 HORIZON BRVIRONMENTAL APC