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TAO 1 M 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) (u 1L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ugIL) (uglL) (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 na no no no na na no na 4804 2111 -2693 screened 06110M <50 <0 50 <0 50 <0 50 <0 50 <50 no na na na no na na na 4250 2139 interval 09108!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 ns ns, ns ns ns ns ns ns ns ns ns ns 2036 wellhead survey 12/30/98 87 <0 50 <0 50 <0 50 <0 50 <50 na no no no no na na na 4533 -2497 no odor 1 no sheen 03/26/99 55 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <10 no no 4116 -2080 no odor 1 no sheen 06102!99 180 74 <0 50 0 51 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 78 <0 50 4064 2028 no odor 1 no sheen 06!31199 260 <0 50 <0 50 0 51 <0 50 <0 50 <0 50 <0 50 <0 50 16 <50 <5 0 130 <0 50 4546 25 10 no comment 12/09199 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 59 <0 50 4695 -2659 02121100 <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 45 26 2490 no odor 1 no sheen 05/18100 <50 40 50 2 7 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 no no 3968 19 32 no odor 1 no sheen 0912660 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na no no no no na no no 4876 28 40 no odor 1 no sheen 12120/00 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no na na na na no na no 4735 2699 no odor 1 no sheen 03127/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no na no na na na no no 46 13 2577 no odor 1 no sheen 06126/01 <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 28 34 no oda 1 no sheen 09/05/01 130 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na no 5378 -3342 no oda 1 no sheen 11130/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na na no no na 5378 3342 no odor 1 no sheen 02126102 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na no na na na no no no 5046 30 10 no odor 1 no sheen 05116102 <50 <0 50 15 <0 50 <0 50 0 55 <0 50 <0 50 <0 50 <5 0 <50 <5 0 14 <0 50 5062 2193 2869 no odor 1 no sheen 002102 110 <0 50 0 85 <0 50 <0 50 <5 0 na na na no na na na no 5872 3579 no odor 1 no sheen 12/04102 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no na na no no no no 5699 3506 no odor!W sheen 02/17103 <50 <0 50 <0 50 <0 50 <0 50 <0 50 no no no no no no no na 5385 3192 no odor 1 no sheen 06/02103 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 8 4 <0 50 5324 31 31 no odor 1 no sheen 09/16103 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 02123104 <50 <0 50 085 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 4 0 <0 50 5500 3307 no odor 1 no sheen 06/07104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5538 3345 not sampled 09107!04 ns ns ns ns ns ns as ns ns ns ns ns ns ns 13189 3996 not sampled 12110104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 59 51 37 58 not sampled 03108!05 <50 <0 50 077 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 13 <0 50 5589 33 96 oda 1 no sheen 419gmie5 As ProjwtNo 141948 Page 1 of 13 HORIZON ENVIRONMENTAL INC