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metals have been detected sporadically in several soil <br /> borings at DDRW-Tracy. Modify the text accordingly. <br /> 65. Page 3-180, Section 3.8.3.0 <br /> Explain the rationale for using the upper limit of <br /> background concentration as the mean value plus 3 times the <br /> standard deviation. <br /> 66 . Page 3-183, Section 3.11 <br /> All reports, including progress reports, should be made <br /> available to EPA and to all regulatory agencies in order to <br /> keep up with the progress of investigations. <br /> 67 . Pages 3-183 through 3-185, Section 3. 12 <br /> What is the tentative schedule for reports on each OU? <br /> Explain how soils contamination on northern DDRW-Tracy is to <br /> be modeled into the groundwater (OU 1) for baseline risk <br /> assessment. (See also General Comment No. 28 . ) <br /> I-18 <br />