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BENZENE CONCENTRATON VS.TIME <br /> STOCKTON MAINTENANCE YARD <br /> 3,000 <br /> 2,600 <br /> 2,000 <br /> O <br /> 1,500 <br /> z <br /> Lu <br /> O 1,000 - <br /> 500 <br /> .. .. .. .. .. ... <br /> 4/1/96 6/1/96 811/96 10/1196 12/1/96 2/1/97 4/1/97 611/97 8/1197 1011/97 12/1197 211/98 4/1/98 611/98 8/1/98 10/1/98 1211/98 <br /> DATE ENVIRONMENTAL <br /> GEOTECHNICAL <br /> CO,VSULTI,VC-E,VCI,VEE,9iNC-rRSTI,VO <br /> FIGURE 3 <br />