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ATTACHMENT II <br /> Subject: Geohydrological Investigations Draft Engineering Report <br /> Defense Depot Tracy - Tracy, California <br /> The comments below list areas of discussion that should be added <br /> to the second phase of the investigation. <br /> THEORY OF OPERATION <br /> - Data on soil permeability and moisture content during soil-gas <br /> sampling. <br /> - Information on any geologic path distortion that could affect <br /> the results. <br /> - Information on how existing structures and roads might affect <br /> the concentration gradient. <br /> RATIONALE FOR PROBE. LOCATIONS AND DEPTH <br /> - Basis for determining areas of known or suspected <br /> contamination. <br /> - Information to show that the chosen sampling depth allows <br /> proper mapping of the plumes considering the physical proporties <br /> of the native soil. <br /> SOIL VAPOR SAMPLING FOR ON-SI'T'E ANALYSIS <br /> Information on the analytical apparatus: <br /> (a) Rationale for the type of stationary phase used in column. <br /> Specify type of packing used. <br /> (b) Type of detector used. <br /> (c) Range of capabilities of the installed system <br /> (d) Adequacy of the system for this particular investigation. <br />