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which have been used as hazardous waste storage areas and <br /> for other purposes which would seem to put the runoff in <br /> jeopardy of collecting a measurable amount of a large <br /> variety of contaminants with the potential for human health <br /> and environmental risk. The proposal for sampling the <br /> unlined holding pond is included in this Work Plan, however <br /> no mention of sampling of the drainage ditch is made. This <br /> ditch should be considered a possible route of migration of <br /> contaminants off the site and into the subsurface. Propose <br /> appropriate sampling. <br /> 11. Page 2-12, Section 2 .1. 6. 1.1 <br /> State the percentage of potential sensitive individuals, <br /> those aged 65 and older that live within the Tracy city <br /> limits. State what sources of information were used to <br /> determine the demographic profile for Tracy. <br /> 12 . Page 2-12 and 2-13, Section 2. 1. 6.4 <br /> State if there are any informational sources regarding <br /> future development plans for the land surrounding the base. <br /> 13 . Page 2-15, Section 2. 1.7.3 <br /> State whether DDRW-Tracy is in the historical range of any <br /> endangered species (e.g. , the San Joaquin kit fox, the <br /> Valley Elderberry Longhorn Beetle, . or the Fresno kangaroo <br /> rat) . <br /> 14 . Page 2-16, Section 2. 1.8.2 <br /> State whether the area of the Prisoner of War camp could <br /> become an historical monument. <br /> 15. Page 2-20, Section 2 .2 .2 .4.3 <br /> The conclusion, (first by Radian and later by WCC) that <br /> "with the possible exception of arsenic, metal <br /> concentrations in the groundwater do not appear to have been <br /> significantly impacted by present and past waste disposal <br /> practices at DDTC" (now DDRW-Tracy) has been altered by the <br /> August 1991 well monitoring analysis for total metals on <br /> northern DDRW-Tracy. Maximum concentrations for these total <br /> metals were clearly greater than background concentrations: <br /> arsenic, barium, boron, chromium, lead, manganese, mercury, <br /> nickel and vanadium. These conclusions must be revised. <br /> 16. Page 2-23, Section 2 .2.2 .8. 1, second bullet <br /> Arsenic was also detected in each soil boring in which it <br /> was analyzed. Metals were also detected in several other <br /> soil borings. This study of mostly soils contamination is <br /> focused too heavily on VOCs. Revise the text. <br /> 17 . Page 2-32, Section 2 .2.3. 1. 16 <br /> The text does not mention the results of the Telic 1991 soil <br /> study. Please summarize them. <br /> I-10 <br />