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T& 1 L 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) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (feet) (feet sea level) (feet sea level) Comments MW-1 03/31/98 65 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no na no 4804 2111 2693 screened 06/10/98 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 4250 2139 interval 09/08/98 230 8 1 058 <0 50 072 <0 50 <0 50 <0 50 <0 50 17 <50 <5 0 no no 4695 -2584 no odor 1 no sheen 65'-85' 11!12!98 ns ns no ns ns ns ns ns ns ns ns ns ns ns 2036 wellhead survey 12/30/98 87 <0 50 <0 5o <0 50 <0 50 <50 no no no no no na no no 4533 -2497 no odor 1 no sheen 03126!99 55 <0 50 <0 50 4050 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <10 no na 4116 2080 no odor I no sheen 06/02/99 180 74 <0 50 051 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 78 <0 50 4064 -2028 no odor 1 no sheen 08/31/99 260 <0 50 <0 50 051 <0 50 <0 50 <0 50 <0 50 <0 50 16 <50 <50 130 <0 50 4546 2510 no comment 12/09/99 <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 02/21/00 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 17 <0 50 4526 -2490 no odor I no sheen 05/18/00 <50 <0 50 27 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 C50 no no 3968 1932 no odor I no sheen 09/26/00 <50 <0 50 <0 50 <0 50 <0 50 <50 no no no no na no no no 4876 2840 no odor 1 no sheen 12/20/00 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no na no no no na no 4735 2699 no odor!no sheen 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 <50 no no no no no no no no 4613 2577 no odor I no sheen 06/26/01 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 33 <0 50 4870 2834 no odor I no sheen 09/05/01 130 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 5378 3342 no odor!no sheen 11/30/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no na no no 5378 3342 no odor!no sheen 02/26/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no na 5046 3010 no odor!no sheen 05/16/02 <50 <0 50 1 5 <0 50 <0 50 055 <0 50 <0 50 40 50 <50 <50 <5 0 14 <0 50 5062 21 93 2869 no odor I no sheen 09/12102 110 <0 50 085 <0 50 <0 50 <5 0 no na no no no no no no 5872 3679 no odor!no sheen 12/04/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no na no no no no no no 5699 3506 no odor/no sheen 02/17/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 no no no na na no no no $385 -31 92 no odor 1 no sheen 06102103 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 5o <5 0 <50 <5 0 84 <0 50 5324 31 31 no odor I no sheen 09/18/03 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 5848 3655 not sampled 02!23104 <50 <0 50 085 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 40 <0 50 5500 3307 no odor I no sheen 419gmr04 As PrgectNo 141947 Page 1 of 13 HORIZON ENVIRONMENTAL INC