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ti <br /> for setting the standard at the stated levels (i.e. , 0.5 Max. Daily <br /> Conc. and 1.0 Monthly Median Conc. ) . Modify the ARARs tables to reflect <br /> the addition of this standard. <br /> 5. Section 4.2.5 <br /> The text refers to "BAT" as criteria to be met to satisfy the State's <br /> Resolution 68-16, however, the correct terminology is "BPT." It is <br /> EPA's understanding that a balancing criteria is used to determine BPT. <br /> The balancing criteria are site conditions, treatment technologies, and <br /> cost (reference EPA Region 9 Regional Administrator decision of July 9, <br /> 1993, regarding the FFA dispute at Mather AFB) . <br /> Corrective Action: Please search the ROD for all uses of BAT and the <br /> criteria for 68-16 and correct to "BPT." Include text which explains <br /> the balancing criteria to be utilized. <br /> 6. Section 4.2.6 <br /> EPA requested that the text which implies that metals concentrations are <br /> naturally occurring be deleted. As was discussed on June 16, 1993, text <br /> was added that states that metals will be further evaluated in the <br /> comprehensive RI/fs, however, the implication that metals are naturally <br /> occurring remains. <br /> Corrective Action: Delete the statement which implies that metals are <br /> naturally occurring. <br /> 7. Figure 5.1-1 <br /> The potential source map omits SWMU 113 (at the present location of the <br /> subsistence warehouse) . <br /> Corrective Action: Revise the figure to include SWMU 113. <br /> S. Section 5.2.5.2 <br /> The text erroneously indicates that MCLs exist for dieldrin. <br /> Corrective Action: Please correct the text and provide the correct <br /> citations. <br /> 9. Table 5.2.1 <br /> This table has been added to the draft final ROD at the request of EPA. <br /> a. The decision rationale regarding DCE states "detected levels <br /> possibly base related." DCE is a degradation product of TCE and <br /> text,PCE. Contrary to the there <br /> the relationship between thepresence nofuDCE rand nty with rd to <br /> base-related <br /> contamination. <br /> Corrective Action: Revise the text to state that DCE is base <br /> related chemical (as stated for TCE and PCE) . <br /> b. The table indicates that carbon tetrachloride was not detected. <br /> While this may be true for the database utilized in the <br /> development of this table (WCC data) , it does not explain the <br /> inclusion of carbon tetrachloride on the list of constituents not <br /> the calculation of risks, and it does not acknowledge the <br /> detection of carbon tetrachloride at the private downgradient <br /> wells. Further , the footnote which states that the chemical has <br /> 2/7 <br /> EPA/R9 Juty 28, 1993 <br />