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. TA01 0 <br /> GROUNDWATER MONITORING DATA <br /> Former Beacon Station No 12419 <br /> 2350 Waterloo Road, Stockton, California <br /> ethyl Depth Y ept to TOC GW <br /> Well TPH9 benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation <br /> Number Date (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (uglL) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) ug1L) (ug/L) (ug/L) (feet) (feet sea level) (feet sea level) Comments <br /> MW-7 11112/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2055 wellhead survey <br /> screened 12!30!98 340 48 1 74 22 <5 0 no no no no no no no na 4543 2488 no odor I no sheen <br /> interval 03/26199 550 94 <0 50 <0 50 4050 <0 50 <0 50 <0 50 <0 50 23 <50 <5 0 no na 4133 2078 no odor I no sheen <br /> 41 66 06!02!99 230 <0 50 <0 50 <0 50 <0 50 1 1 <0 50 <0 50 <0 50 28 <50 <50 270 <0 50 4076 2021 no odor I no sheen <br /> 08/31199 120 <0 50 <0 50 <0 50 <0 50 12 <0 50 <0 50 <0 50 13 <50 <50 160 <0 50 4556 25 01 no comment <br /> 12!09!99 130 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 98 <0 50 47 14 2659 <br /> 02/21/00 130 <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 68 <50 <50 na no 4078 2023 no odor!no sheen <br /> 09126/00 68 <0 50 <0 50 <0 50 <0 50 <5 0 no no na na no na no no 4889 2834 no odor I no sheen <br /> 12120/00 87 <0 50 <0 50 <0 50 <0 50 <5 0 no na no no no no no na 4751 2696 no odor I no sheen <br /> 03127/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no na no no na no no na 4637 -2582 no odor I no sheen <br /> 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 4903 -2848 no odor!no sheen <br /> 09/05101 68 <0 50 <0 50 <0 50 <0 50 <50 no no na na na na na no 5406 3351 no odor!no sheen <br /> 11/30101 97 <0 50 <0 50 <0 50 <0 50 <50 na no na na no no no no 5401 3346 no odor I no sheen <br /> 02x26102 fib <0 50 <0 50 <0 50 <0 50 <5 0 na na no no na no no na 5065 3010 no odor I no sheen <br /> 05116102 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 I no sheen <br /> 09112!02 77 <0 50 <0 50 <0 50 <0 50 <5 0 no no na na na no no no 5873 3662 no odor 1 no sheen <br /> 12x04102 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no na na no na no na na 5724 3513 no odor I no sheen <br /> 02/17/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 no no na na no na no no 5408 3197 no odor!no sheen <br /> 06/02103 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 16 <0 50 5331 3120 no odor!no sheen <br /> 09/18103 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na no no na no no na 5963 3752 no odor!no sheen <br /> 11/24/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5844 3633 not sampled <br /> 02/23/04 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 12 70 <0 50 5497 3286 no odor 1 no sheen <br /> 06/07/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 55 17 3300 not sampled <br /> 09/07104 <50 <0 50 <0 50 <0 50 <0 50 070 na no no no na na na no 6062 3851 no odor I no sheen <br /> 12/10104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5942 -3731 not sampled <br /> 03/08105 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 57 <0 50 5585 -3374 odor I no sheen <br /> 1 <br /> Project <br /> PNo 1 s R47948 Page 7 of 13 HORIZON ENVIRONMENTAL INC <br /> IBct 7 <br />