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TA161 r <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 Date (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (uglL) (uglL) (uglL) (uglL) (ug/L) (feet) (feet sea level) (feet sea level) Comments <br /> 8AW4 03/31/98 75 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4792 2000 -2792 <br /> screened 06/10/98 58 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4221 -2221 <br /> interval 09/08/98 50 13 14 <0 50 24 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 na na 4664 2664 no odor 1 no sheen <br /> 48'-70 11/12/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2000 wellhead survey <br /> 12/30/98 68 14 087 <0 50 1 1 <5 0 na na na na na na na na 4500 -2500 no odor!no sheen <br /> 03/26/99 74 <0 50 <0 50 <o 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <20 na na 4075 -2075 no odor 1 no sheen <br /> 06102/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 32 <0 50 4019 2019 no odor/no sheen <br /> 08/31/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 43 <0 50 4509 -2509 no comment <br /> 12/09199 <50 <0 50 <0 50 <0 5o <0 50 <0 50 <0 50 <0 50 <0 50 69 <50 <5 0 49 <0 50 4656 -2656 <br /> 02121100 68 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <o 50 <0 50 <5 0 <50 <5 0 30 <0 50 4494 -2494 no odor 1 no sheen <br /> 05118/00 62 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na na 3923 -1923 no odor 1 no sheen <br /> 09/26/00 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4855 -2855 no odor 1 no sheen <br /> 12/20/00 <50 <0 50 <0 50 co 50 <0 50 450 na na na na na na na na 4698 -2698 no odor 1 no sheen <br /> 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na no 4571 2571 no odor!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 <0 50 <0 50 4840 2840 no odor I no sheen <br /> 09105/01 <50 <o 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5355 3355 no odor!no sheen <br /> 11/30/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5339 -3339 no odor!no sheen <br /> 02/27/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5009 -3009 no odor!no sheen <br /> 05/16/02 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 43 <0 50 5027 2156 -2871 no odor I no sheen <br /> 09/12/02 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 5846 -3690 no odor I no sheen <br /> 12/04/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5660 -3504 no odor I no sheen <br /> 02/17/03 110 <0 50 <0 50 <0 50 <0 50 <0 50 nana na na na na na na 5344 -31 88 no odor!no sheen <br /> 06/02/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 74 <0 50 5284 -3128 no odor!no sheen <br /> 09/18103 ns ns ns ns ns ns ns AS ns ns ns ns ns ns nm nm not sampled <br /> 11124/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na 5791 -3635 no odor 1 no sheen <br /> 02123104 60 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 59 <0 50 5436 -3280 no odor!no sheen <br /> 06/07104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5463 -3307 not sampled <br /> 4 79gmrO4 xls <br /> PrgjW No 1419 47 Page 4 of 13 HORIZON ENVIRONMENTAL INC <br />