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0 <br /> TABLE 1 <br /> Groundwater Monitoring Data <br /> Former Beacon Station No 12419 <br /> 2350 Waterloo Road, Stockton, California <br /> f.lhyl Depth to roc GW <br /> Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation <br /> Number Date (uglL) (uglL) (uglL) (ug1L) (ug1L) (ug1L) (uglL) (uglL) (ug1L) (uglL) (ugll-) (uglL) (uglL) (uglL) (feet) (feet sea level) (feet sea level) Comments <br /> MW-5 03/31/98 75 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4846 2043 -2803 <br /> screened 06/10/98 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4272 -2229 <br /> Interval 09/08/98 <50 1 2 091 <0 50 094 <0 50 <0 50 <0 50 <0 50 <60 <50 <5 0 na na 4692 -2649 no odor I no sheen <br /> 48 -71 11/12/98 2043 wellhead survey <br /> 12/30/98 110 067 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4545 -2502 no odor I no sheen <br /> 03/26/99 67 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <20 na na 4126 -2083 no odor I no sheen <br /> 06102/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 71 <0 50 4061 -2018 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 <50 <50 <5 0 16 <0 50 4549 -2506 no comment <br /> 12/09/99 140 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 200 <0 50 4704 -2661 <br /> 02/21/00 140 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 190 <0 50 4547 -2504 no odor I no sheen <br /> 05/18/00 <100 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 12 <100 <10 na na 4071 -2028 no odor 1 no sheen <br /> 09/26/00 64 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4882 -2839 no odor 1 no sheen <br /> MW-6 03/31/98 110 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4836 2066 -2770 <br /> screened 06/10/98 79 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4268 -2202 <br /> Interval 09/08/98 <50 086 077 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 na na 4697 -2631 no odor 1 no sheen <br /> 48'-71 5' 11/12/98 2065 wellhead survey <br /> 12/30/98 53 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4557 -2492 no odor/no sheen <br /> 03/26199 84 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 na na 41 25 -2060 no odor I no sheen <br /> 06/02/99 59 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 <0 50 <0 50 4071 -2006 no odor I no sheen <br /> 08/31199 63 <0 50 <0 50 <0 54 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 <0 50 <0 50 4557 -2492 no comment <br /> 12/09/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 50 50 <0 50 4729 -2664 <br /> 02/21/00 690 29 120 20 87 <0 50 <0 50 <0 50 <0 50 <50 <50 20 1 1 16 4569 -2504 no odor I no sheen <br /> 05/18/00 <50 <0 50 23 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 na na 4084 -2019 no odor I no sheen <br /> 09/26/00 <50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na na 4892 -2827 no odor I no sheen <br /> 419gmrOO xis <br /> 141941 Page 3 of 6 HORIZON ENVIRONMENTAL INC <br />