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SPECIFIC COMMENTS <br /> 1.1 Section 4.3.2, page 4-6, sixth paragraph, third sentence. This sentence <br /> states that the results for the soil samples analyzed by DI-WET were compared <br /> to groundwater concentrations requiring evaluation presented in the ROD. The <br /> ROD presents groundwater concentrations requiring evaluation but does not <br /> specify the use of those concentrations to evaluate soil concentrations that <br /> exceed the ROD-specified soil cleanup standards. Please discuss the <br /> regulatory basis for the use of groundwater concentrations requiring evaluation <br /> to evaluate soils above ROD-specified soil cleanup standards. This comment <br /> also applies to a similar discussion for SWMU 20 on page 4-7. <br /> 1.2 Section 4.3.2, page 4-6, sixth paragraph,fourth sentence. The results for <br /> the DP0093 and DP0094 are presented in ug/kg, but it appears the units should <br /> be ug/L, as shown on the sample results table for SWMU 6 (Table 4-2A). <br /> Please correct the units in the text. <br /> 1.3 Section 4.3.2, page 4-8, second paragraph. This sentence presents DP0096 <br /> twice, first as a sidewall sample and then as a bottom sample. Please revise the <br /> sentence to present the correct sample numbers for sidewall and bottom <br /> samples. <br /> 1.4 Table 3-1. The table shows no ROD-specified groundwater concentrations <br /> requiring evaluation for tetrachloroethene (PCE), ethylbenzene, trichloroethene <br /> (TCE), or xylenes at SWMU 20. However, the ROD (page 9-18) specifies <br /> concentrations for these compounds ranging from 2 ug/L to 29 ug/L. In <br /> addition, the TCE concentration for SWMU 27 is presented as 23 ug/L on <br /> Table 3-1 but is 2.3 ug/L in the ROD. Please correct Table 3-1 to present <br /> correct concentrations. <br /> 1.5 Table 4-2B. The table incorrectly lists the groundwater concentrations <br /> requiring evaluation (50) as soil cleanup standards for 2,4-dinitrophenol and <br /> pentachlorophenol. Revise the soil cleanup standard row of the table to <br /> contain the correct soil cleanup standards (830) for these two compounds. <br /> 1.6 Table 4-213. The units for all methods appear to be the same, but the cleanup <br /> standards and results for EPA Method 8015M are three orders of magnitude <br /> too low. Please specify on the table that the units for EPA Method 8015M are <br /> mg/kg, as was done for the other tables, or increase all the EPA Method <br /> 2 <br />