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26. Section 4.2.2 <br /> The text contains the unnecessarily subjective word "sporadically" to describe the <br /> 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 /> 27. Section 4.2.2 <br /> The text provides an incomplete listing of the chemicals of concern found in the <br /> groundwater of OU #1 (e.g., it does not list arsenic, chromium, lead, and manganese). <br /> Corrective Action: Provide a complete listing of the other chemicals of concern in <br /> the text. <br /> 28. Section 4.2.2 <br /> The last sentence in this section implies that only a subset of the chemicals of <br /> concern will be addressed in the Comprehensive RI/FS, whereas all chemicals of <br /> concern will be addressed in the Comprehensive RI/FS. <br /> Corrective Action: Revise the text to state that all chemicals of concern will be <br /> addressed in the Comprehensive RI/FS. <br /> 29. Section 4.2.3 <br /> The text in this section and in Table 4.2.1 modifies the term "ARARs" with the <br /> phrase "health based" or "health related." However, these modifiers are unnecessary <br /> and confusing. <br /> Corrective Action: It is more accurate to specifically identify the ARAR being <br /> referenced (e.g., the federal MCLS for PCE and TCE or the state MCL for DCE). <br /> Review the ROD for similar instances of non-specific text referring to ARARs and <br /> revise. <br /> 30. Section 4.2.4 <br /> This text states that the objective of this remedial action is to reduce contamination <br /> of TCE, PCE [and DCE] to "less than" the respective MCLS. However, the MCLs are <br /> the standards for this ROD, not "less than" the MCLS. <br /> Corrective Action: Revise this text accordingly. Search the entire ROD for any <br /> similar misstatement of the standards and correct. <br /> EPA/R9 June 7, 1993 8/40 <br />