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TA61 <br /> GROUNDWATER MONITORING DATA <br /> Former Beacon Station No 12419 <br /> 2350 Waterloo Road,Stockton,California <br /> ethyl Depth to TOC GW <br /> Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation <br /> Number Dale (ug1L) (uglL) (ug1L) (ug1L) (uglL) (ug/L) (ug/L) (ug1L) (ug/L) (ug/L) (ug/L) (ug1L) (uglL) (ug/L) (feet) (feet sea level) (feet sea level) Comments <br /> MW-7 11/12198 ns ns ns no ns ns ns ns ns ns ns ns no ns 2055 wellhead survey <br /> screened 12130198 340 48 1 74 22 <5 0 no no na no no no na no 4543 2488 no odor 1 no sheen <br /> interval 03/26/99 550 94 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 23 <50 <5 0 no no 4133 -2078 no odor 1 no sheen <br /> 41'-66' 06102199 230 <0 50 <0 50 <0 50 <0 50 1 1 <0 50 <0 50 <0 50 28 <50 <5 0 270 <0 50 4076 -2021 no odor 1 no sheen <br /> 08131199 120 <0 50 <0 50 <0 50 <0 50 12 <0 50 <0 50 <0 50 13 <50 <5 0 160 <0 50 4556 -2501 no comment <br /> 12109/99 130 <0 50 <0 50 <00 <br /> <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 98 <0 50 4714 -2859 <br /> 02121/00 130 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 84 <50 <5 0 96 <0 50 4556 -2501 no odor/no sheen <br /> 05118/00 120 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 6 B <50 <50 no no 4078 -2023 no odor 1 no sheen <br /> 09126/00 68 <0 50 <0 50 <0 50 <0 50 <50 na no no no na no no no 4889 2034 no odor 1 no sheen <br /> 12120100 87 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no na 4751 -2696 no odor 1 no sheen <br /> 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 <50 no no no no na no no no 4637 2582 no odor 1 no sheen <br /> 06126/01 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 33 4050 4903 2848 no odor/no sheen <br /> 09105/01 68 <0 50 <0 50 <0 50 <0 50 <50 no no na no no no no no 5406 3351 no odor 1 no sheen <br /> 11130!01 97 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na no no no no 5401 3346 no odor!no sheen <br /> 02!26102 66 <0 50 <0 50 <0 50 <0 50 <5 0 na no no no no no no no 5065 30 10 no odor 1 no sheen <br /> 05/16/02 87 <0 50 <0 50 <0 50 <0 50 0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 26 <0 50 5071 2211 -2860 no odor 1 no sheen <br /> 09112102 77 <0 50 <0 50 <0 50 <0 50 <50 no no no no na no no no 5873 -3662 no odor/no sheen <br /> 12/04/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na no no no no 5724 -3513 no odor 1 no sheen <br /> 02/17103 <50 <0 50 <0 50 <0 50 <0 50 <0 50 no no na no no na no no 5408 -31 97 no odor 1 no sheen <br /> 06/02/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 16 <0 50 5331 -31 20 no odor 1 no sheen <br /> 09/18103 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no na no no 5963 -3752 no odor 1 no sheen <br /> 11!24/03 ns ns ns ns ns ns ns ns no ns ns ns ns ns 5844 -3633 not sampled <br /> 02123104 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 12 70 <0 50 5497 3286 no odor/no sheen <br /> 06107104 ns ns ns ns ns ns ns no no ns ns ns ns ns 55 17 3306 not sampled <br /> ftied No 141947 Page 7 of 13 HORIZON ENVOtOMMENTAL LAC <br />