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2. FIELD INVESTIGATION <br /> Sampling began with vapor sampling point V1 next to the <br /> location of the fuel tank ( see Figure 1 -2.) . In order to assess <br /> possible differences in vapor constituent concentrations at <br /> different depths, vertical profile was made at V1 at depths of 3 , <br /> 5 . 5 , 8 , and 9 . 5 feet- as no detectable compounds were observed <br /> the SVA survey proceeded to V2 . Vapor constituents were detected <br /> at a depth of 7 . 5 feet at V2, and all of the remaining samples <br /> were taken at that depth. <br /> The soil vapor samples were collected with a microsyringe and <br /> in)ected into the chromatograph. The instrument was standardized <br /> with prepared standards containing 10 Ppm of benzene and toluene. <br /> These compounds could be distinguished from each other on the <br /> chromatograms by their differences in retention time. <br /> Points were chosen on the four sides of the tank area so as to <br /> estimate the migration direction, if any, of soil vapor <br /> constituents. Vapor points were driven at 13 locations in the <br /> northwest area of the property ( see Figure 1 -2 ) . In the course <br /> of the sampling day, four standards and three system blanks were <br /> run on the Photovac. <br /> F <br /> 6 <br />