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T1 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 ethanol DCA EDB GW Elevation Elevation Number Date (ug/L) (uglL) (ug1L) (ug1L) (uglL) (ug1L) (uglL) (ug1L) (uglL) (ug/L) (ug/L) (ug1L) (ug/L) (uglL) (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 12/30/98 180 <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 03/26/99 140 064 <0 50 <0 50 072 <0 50 <0 50 <0 50 <0 50 92 <50 <5 0 na na 4165 2078 no odor 1 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 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 <5 0 65 <0 50 4574 2487 no comment 12/09/99 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 I no sheen 05118/00 <50 <0 50 31 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 na na 41 11 2024 no odor/no sheen 09126/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm well access blocked 12/20100 <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 03/27101 <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 06/26101 <50 <0 54 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 <0 50 <0 50 4905 2818 no odor I no sheen 09/05/01 <50 <0 50 1 4 <0 50 <0 50 <5 0 na na na na na na na na 5405 3318 no odor!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 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!no sheen 09/12/02 58 <0 50 -050 <0 50 <0 50 <50 na na na na na na na na 5891 -3649 no odor!no sheen 12104/02 <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 02117/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na 5444 -3202 no odor 1 no sheen 06/02/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 092 <0 50 5353 -31 11 no odor I no sheen 09/18103 670 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 5981 3739 no odor/no sheen 11/24/03 <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 4i9grnrOS ifs Page 10 of 13 HORIZON ENVIRONMENTAL INC