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• TAB* 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) (ug/L) (ug/L) (ugly (ugly (ug/L) (ug1L) (ugly (ug/L) (ug/L) (ugly (ugly (ug/L) (ug/L) (feet) (feet sea level) (feet sea level) Comments MW 1 03131/9B 65 <0 50 .050 c0 50 4 50 -50 na na na na na na na na 4804 21 11 2693 screened 06/10198 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4250 2139 interval 09/08/98 230 81 058 <0 50 072 <0 50 <0 50 <0 50 <0 50 17 <50 <50 na na 4695 2584 no odor 1 no sheen 65 85 11/12/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2036 wellhead survey 12130/98 87 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4533 2497 no odor/no sheen 03126199 55 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 440 na na 41 16 2080 no odor I no sheen 06/02/99 160 74 <0 50 051 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 78 <0 50 4064 2028 no odor I no sheen 08/31/99 260 <0 50 <0 50 051 <0 50 <0 50 <0 50 <0 50 <0 50 16 450 <50 130 <0 50 4546 2510 no comment 12109/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 59 <0 50 4695 2659 02121/00 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 17 <0 50 4526 2490 no odor 1 no sheen 05118/00 <50 <0 50 27 .050 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na na 3968 1932 no odor 1 no sheen 09/26/00 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4876 2840 no odor 1 no sheen 12120/00 <50 4 50 4 50 <O 50 <0 50 <5 0 na na na na na na na na 4735 2699 no odor/no sheen 03127/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4613 2577 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 <5 0 33 <0 50 4870 2B 34 no ado(]no sheen 09/05101130 <0 50 <0 50 <0 50 <0 50 <50 na na ria na na na na na 5378 3342 no odor I no sheen 11/30101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5378 3342 no odor I no sheen 02126!02 <50 <0 50 <0 50 <0 50 c0 50 <50 na na na na na na na na 5046 3010 no odor 1 no sheen 05/16/02 <50 <0 50 1 5 <0 50 <0 50 055 <0 50 <0 50 <0 50 <50 <50 <50 14 <0 50 5062 21 93 2869 no odor I no sheen 09/12/02 110 <0 50 085 <0 50 <0 50 <5 0 na na na na na na na na 5872 3679 no odor/no sheen 12/04/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5699 3506 no odor!no sheen 02/17/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na 5305 3192 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 84 <0 50 5324 3131 no odor 1 no sheen 09/18103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 11/24/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5840 3655 not sampled 02!23/04 <50 e0 50 085 <0 50 4 50 4 50 <0 50 <0 50 <0 50 <5 0 <50 <50 40 <0 50 5500 3307 no odor 1 no sheen 06107/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 55 38 3345 not sampled 09/07/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6189 3996 not sampled 12/10/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5951 3758 not sampled 419gmrO4 Rrs ProjwtNo 141947 Page 1 of 13 HORIZON ENVIRONMENTAL.INC