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David Wang, P.E. <br /> Page 3 <br /> picture concerning contamination in Area 4 sketchy. There is <br /> not sufficient data available to define the extent of <br /> contamination. <br /> AREA 5: <br /> Area 5 is located near the center of the Depot. Soil and soil <br /> gas samples did not detect TCE or PCE at levels of concern. <br /> It is thought that past handling and storage practices are <br /> responsible for the presence of groundwater contamination. <br /> AREA 6: <br /> Area 6 is located at the eastern most corner of the Depot. <br /> Aerial photography indicated stained soil . It is thought that <br /> open storage at or near Area 6 is the source of contamination. <br /> Review of the draft report comprises 3 parts: 1) an overview <br /> with specific comments, 2) a hydrogeologic evaluation <br /> completed by the technical services unit (attachment to this <br /> memo) , and 3) an evaluation of the endangerment assessment. <br /> The endangerment assessment is being conducted by the <br /> Departments' toxicology section and will be forwarded when <br /> completed. <br /> SPECIFIC COMMENTS <br /> 1) Page 2-1 Section 2.0.1: <br /> The project QA/QC requirements used to screen data from <br /> previous reports is not defined. The Department requests <br /> clarification of QA/QC requirements used. <br /> 2) Page 2-2 and Figure 2. 1-1: <br /> The draft engineering report summarizes the previous work <br /> of both the Jefferson Associates (June 1982) and the <br /> Radian Corporation (August 1986) . Listed in these <br /> reports are a number of potential hazardous waste sites. <br /> The status of these sites has not been clearly defined. <br /> The Department recommends that these potential sites and <br /> any others be listed together in one common reference. <br /> The listing should include their status as source <br /> locations (ie. has sufficient characterization been <br /> conducted to determine: 1) they are contamination <br /> sources, 2) they are not contamination sources, or 3) <br /> further characterization is needed) . <br /> 3) Page 5-20,21 Section 5.3.2.1 and Table 4. 6-1: <br /> The report calculates the amount of TCE and PCE residing <br /> in the soil . These calculations were not provided in the <br />