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+ F - - - - <br /> soil, and the soil matrix must 'have sufficient permeability to <br /> allow migration ;+of the volatile constituents. for sampling and <br /> analysis. Diesei fuel generally contains a low volatile content <br /> and, especially in the case of an old spill, may not be detected 'by <br /> i. <br /> the soil vapor technique. , In :.addition, the soils in the study <br /> i� <br /> region are :predominantly clay-rich with some sand .and silt. ' The <br /> low permeability„ .of such soils' may also interfere with the soil <br /> vapor method. However, it is likely that any. fuel released from <br /> the pipeline would be mostly confined to the trench backfill and <br /> the backfill may have sufficient; permeability to allow detection of <br /> i - <br /> any volatiles that may be present. <br /> The applicability of the soil vapor method to this <br /> . PP Y P <br /> problem needs to be establishe.d. i This will be accomplished by <br /> I'4 .testing the method in an area of a known leak. A tight grid of <br /> sampling points will be established along the length of the aline in <br /> ` the leak. area. If petroleum 'hydrocarbons are detected ''iby the <br /> technique, the soil will be sampled directly to verify the presence <br /> of diesel fuel. , The sample grid will be extended outside. of the <br /> contaminated zone to determine that the limits of contamination can <br /> E be established by the method. Samples will also betaken -in this <br /> case to verify the absence of contamination. Given the depths of <br /> the line, it is likely that the soil can be sampled with, a hand <br /> auger. If diesel contamination is verified, the soil vapor <br /> sampling grid will be extended laterally away from the line to test <br /> if the method can assess the extent of contamination. <br /> wpipeprop.doe 2 <br />