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5.4.7. A Draft Final Version 3.0 of the subject document was issued for agency review in <br /> February 2001 and will be finalized before the IRAR. Please cite the newer version of <br /> the Comprehensive Field Work Plan or explain why the older version will continue to be <br /> followed for Operable Unit 1. <br /> 4. Table 5-1, page 5-5: The table lists many samples with mercury concentrations of 0.01 <br /> ug/L as exceedances of the effluent standard, but the effluent standard for mercury is <br /> 0.012 ug/L. Please add another significant figure to the exceedance values to clarify that <br /> they exceed 0.012 ug/L,or delete the posted values that are less than 0.012 ug/L. <br /> 5. Section 9.3, page 9-1: The text states that scale has affected the air stripping towers, <br /> extraction systems, and injection wells at DDJC-Sharpe. However, the response in <br /> Appendix B to Marcus Pierce's General Comment 2 on the Draft IRAR states that "Scale <br /> buildup, at least at visible levels, has not been observed at DDJC-Sharpe." We concur <br /> with Mr. Pierce's concern for scale buildup as a factor in limiting the effectiveness of the <br /> injection wells at DDJC-Sharpe and reiterate his request for a discussion of scale removal <br /> in the Final IRAR. <br /> 2 <br />