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34. Section 4.2.6 <br /> Again, the text contains the unnecessarily subjective word "sporadically" to describe <br /> the detection frequency of all other chemicals of concern in OU #1. <br /> Corrective Action: Delete the word "sporadically" and refer the reader to the table to <br /> be inserted in Section 5.2, per EPA's comments. <br /> 35. Table 4.2-1, Health Related Applicable or Relevant and Appropriate Requirements <br /> This title erroneously indicates that all the standards, action levels, criteria are <br /> ARARs. Further, the table mistakenly identifies 5 µg/I TCE as a Proposed Federal <br /> Primary Drinking Water Standard, whereas it is final. It is not clear to EPA why <br /> this table presents alternative standards and criteria which are not utilized in this <br /> ROD. <br /> Corrective Action: Rename this table so that the title more accurately reflects the <br /> contents. Identify in the table the standards which are ARARs for this remedial <br /> action, i.e., 5 µg/1 for TCE (federal), 5 µg/I for PCE (federal), and 6 µg/I for DCE <br /> (state). Correct the indication that the federal TCE drinking water standard is <br /> proposed. Finally, justify why it is necessary to include the additional <br /> standards/criteria or delete them. <br /> 36. Table 4.2-2, Excess Cancer Risk for Exposure to VOCs by off-Base Residents <br /> It is not clear why this table lists the cancer risk for only TCE and PCE. The risk <br /> assessment in the FS for OU #1 evaluated many more contaminants. Further, as <br /> titled, the table is inaccurate since other VOCs are not included. <br /> Corrective Action: Include the risks associated with all the chemicals of concern <br /> evaluated in the OU #1 FS. <br /> 37. Table 4.2-2, OU #1 Chemicals of Concern Aquifer Cleanup Levels and Preliminary <br /> Effluent Treatment Standards <br /> This table erroneously indicates that both the federal and the state MCLS for TCE <br /> and PCE set the aquifer cleanup levels. However, since the state standard is not <br /> more stringent than the federal, the federal standard becomes the ARAR. <br /> Corrective Action: Delete the text "and California" after the numeric cleanup level <br /> for TCE and PCE. <br /> 38. Table 4.2-2, OU #1 Chemicals of Concern Aquifer Cleanup Levels and Preliminary <br /> Effluent Treatment Standards <br /> This table is ambiguous in determining the effluent treatment standards for carbon <br /> tetrachloride, chloroform, and dieldrin. The ROD requires a numeric standard to be <br /> EPA/R9 June 7, 1993 10/40 <br />