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Table 1 = <br /> Groundwater Monitoring Data <br /> Beacon Station No 494 <br /> Stockton,California <br /> Monitoring Date TPHg Benzene Toluene Ethyl Xylenes MTBE Depth to Depth to Groundwater Comments <br /> Well No benzene GW Screen Elevation <br /> 05/26/95 <50 <0 50 <0 50 <0 50 <0 50 NA 6323 6800 4506 no odor/sheen <br /> 08/15/95 <50 064 082 <0 50 26 NA 6405 4588 no odor/sheen <br /> 10/11/95 <50 <0 50 <0 50 <0 50 <0 50 NA 6393 -4576 DTW on 10/24 <br /> 01/16/96 <50 <0 50 <0 50 <0 50 <0 50 NA 6063 -4246 no odor/sheen <br /> 02/21/96 NS NS NS NS NS NS 5922 -41 05 DTW remeasure <br /> 05/30/96 <50 <0 50 <0 50 <0 50 <0 50 <5 0 5590 -3773 Draw down @ 75' <br /> 05/26/95 240 094 <0 50 <0 50 <0 50 NA 6383 6800 -4409 no odor/sheen <br /> 08/15/95 65 <0 50 <0 50 <0 50 <0 50 NA 6465 -4491 no odor/sheen <br /> 10/11/95 <50 <0 50 <0 50 <0 50 <0 50 NA 6273 -4299 DTW on 10124 <br /> 01/16/96 <50 <0 50 <0 50 <0 50 <0 50 NA 6120 -4146 no odor/sheen <br /> 02/21/96 NS NS NS NS NS NS 5979 -4005 DTW remeasure <br /> 05/30/96 58` <0 50 <0 50 <0 50 <0 50 <5 0 5681 -3707 Draw down @ 75' <br /> 05/26195 <50 1 30 <0 50 <0 50 <0 50 NA NR 6800 NR pumping well <br /> 08/15/95 66 1 10 <0 50 <0 50 <0 50 NA 7920 -6005 DTW taken w/pump on <br /> 10/11/95 <50 <0 50 <0 50 <0 50 <0 50 NA 6390 -4475 DNI!on 10124 <br /> 01/16196 <50 <0 50 <0 50 <0 50 <0 50 NA 6256 -4341 pumping well <br /> 02/21/96 NS NS NS NS NS NS 5910 -3995 DTW remeasure <br /> 05/30/96 <50 1 2 <0 50 <0 50 <0 50 <5 0 5587 -3672 Draw down @ 76' <br /> 05/26/95 <50 <0 50 <0 50 <0 50 <0 50 NA 6225 7200 -4413 no odor/sheen <br /> 08/15/95 <50 <0 50 <0 50 <0 50 <0 50 NA 6307 -4495 no odor/sheen <br /> 10/11/95 <50 <0 50 <0 50 <0 50 <0 50 NA 6290 -4316 DTW on 10124 <br /> 01/16/96 <50 <0 50 <0 50 <0 50 <0 50 NA 5973 -4161 no odor/sheen <br /> 02/21196 NS NS NS NS NS NS 5822 -4010 DTW remeasure <br /> 05/30/96 <50 <0 50 12 <0 50 <0 50 <50 5496 -3684 Draw down @ 75' <br /> 05/26/95 66 <0 50 <0 50 <0 50 <0 50 NA 6405 7250 -4397 no odor/sheen <br /> 08/15/955 <50 070 10 <0 50 35 NA 6500 -4492 no odor/sheen <br /> 10/11195 <50 <0 50 <0 50 <0 50 <0 50 NA 6486 -4478 DTV on 10124 <br /> 01/16/96 <50 <0 50 <0 50 <0 50 <0 50 NA 6145 -41 37 no odor/sheen <br /> 02/21/96 NS NS NS NS NS NS 6009 -4001 DTW remeasure <br /> 05/30/96 <50 <0 50 072 <0 50 <0 50 <5 0 5664 -3656 Draw down @ 74' <br /> Notes TPHg=Total Petroleum Hydrocarbons as gasoline MTBE=Methyl-t-butyl-ether <br /> Analytical results reported in parts per billion{ppb} <br /> GW=Groundwater TOC=Top of Casing NS=not sampled <br /> Elev =Elevation referenced to arbdrary datum above sea level <br /> Depths and elevations recorded in feet <br /> HORIZON ENVIRONMENTAL INC <br />