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56. Page 3-158, Section 3.4.3.3 <br /> This section number with heading "Contaminant Transport <br /> Models" should be 3 . 4 . 4 . 3 . <br /> 57 . Page 3-161, Section 3.5.3. 1.2 and 3.5.3.2.1 <br /> In the first referenced section, DDRW-Tracy production wells <br /> 3 , 4, 5 and 6 are identified as the wells being evaluated <br /> and proposed for abandonment in this Work Plan. However, in <br /> the second referenced section and in Table 3 . 5-1 "depot <br /> water supply wells 3 through 7" are discussed. State which <br /> wells are actually being addressed in this Work Plan. <br /> 58 . Pages 3-163 and 164, Sections 3.5.3.4 .2 and 3.5.3.5. 1 <br /> There is a discrepancy in the sequence of events; state if <br /> televideo logs will be run prior to or following sampling. <br /> 59 . Page 3-167, Section 3. 6.3. 1. 1 <br /> DDRW-Tracy should sample for heavy metals around the heavy <br /> equipment degreasing around Building 206. Also, 1988 point <br /> source sampling by Canonie and later AEPCO results indicated <br /> the presence of many heavy metals in and around the north <br /> end of Building 10. Propose additional sampling. <br /> 60. Pages 3-167 and 3-168, Sections 3. 6.3. 1 through 3. 6.3.3 <br /> Explain what products or wastes were contained in the drums. <br /> Is it likely that only VOCs or SVOCs were stored in the <br /> drums at DDRW-Tracy? <br /> 61. Page 3-168, Section 3. 6.3 .3. 1 <br /> Explain then, what was shown in these photos in the EMSL <br /> report if not drums. <br /> 62 . Pages 3-168 and 3-169, Section 3 . 6.3. 4 <br /> Advise EPA as to actual sample locations prior to actual <br /> sampling. <br /> 63 . Pages 3-177 and 3-178, Section 3.7.4 <br /> The preferred strategy to characterize the IWPL appears to <br /> be adequate provided that any "rush" soils analyses <br /> performed in Section 3 .7 .4 . 5 must still reflect the same <br /> data quality as the other RI/FS data. EPA must be kept <br /> apprised of anticipated remedial actions. (See also General <br /> Comment No. 11. ) <br /> 64 . Pages 3-178 through 3-181, Section 3.8 <br /> EPA recognizes the critical importance for risk assessment <br /> purposes of background levels especially for metals and for <br /> the various classes of pesticides. Provide the schedule for <br /> this background sampling. State if it is to be given <br /> priority, or to occur concurrently with other RI field work. <br /> It should be noted that low levels of arsenic have been <br /> detected in nearly every previous WCC soil boring and other <br /> I-17 <br />