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EW009B from Figure 33-1; it is already shown on Figure 3.3-2,which displays Dieldrin <br /> Reported in the Middle Hydrologic Zone Well Samples. <br /> Additionally, the concentration for Well LM028A of 0.074 ug/L should be highlighted in <br /> bold type, as it exceeds the ACL of 0.05 ug/L. Please revise the figure accordingly. <br /> 4. Section 3.3.5, Upper Hydrologic Zone, Page 3-8: The first sentence of Section 3.3.5 <br /> states that a total of nine wells contained concentrations above the ACL for dieldrin of <br /> 0.05 ug/L. Based on the information presented in Figure 3.3-1, there were ten wells (11 <br /> well samples) that contained dieldrin concentrations equal to or greater than the ACL of <br /> 0.05 ug/L. Please revise the first sentence of Section 3.3.5 to contain this information. <br /> 5. Section 3.3.6, Middle Hydrologic Zone, Page 3-8 and Figure 3.3-2,Dieldrin <br /> Reported in Middle Hydrologic Zone Well Samples Third Quarter 2006: Section <br /> 3.3.6 states that three samples (LM029B, LM134AB, and EW029B) contained dieldrin <br /> concentrations above the ACL; however, only two of these results (LM029B and <br /> EW028B) are shown on Figure 3.3-2. Please remove the reference to EW029B,which <br /> did not contain reportable concentrations of dieldrin, and replace it with EW028B. Well <br /> LM134AB, which is discussed in Section 3.3.6 Middle Hydrologic Zone, is presented on <br /> Figure 3.3-1, which shows dieldrin reported in the Upper Hydrologic Zone. Please <br /> resolve this discrepancy and modify the text and/or figures for consistency. <br /> The last sentence of Section 3.3.6 states that the results from the 2006 dieldrin natural <br /> attenuation cone penetrometer test(CPT)investigation are shown on Figure 3.3-2. A <br /> review of Figure 3.3-2 indicates that a 0.05 ug/L isopleth has been drawn to represent <br /> approximate dieldrin concentrations based on Hydropunch data collected during this CPT <br /> investigation. However, CPT sample locations and dieldrin concentrations are not <br /> presented on this figure. As a result, it is somewhat misleading to state that the results <br /> from the CPT investigation are presented on Figure 3.3-2. Please consider adding CPT <br /> investigation sample results to Figure 3.3-2, or rephrase the text of section 3.3.6 to <br /> indicate a concentration isopleth, rather than sampling results, has been added to Figure <br /> 3.3-2. <br /> 6. Section 6.2.1, Page 6=1: The statement"the dieldrin groundwater ACL of 0.005 ug/L <br /> [note - should be 0.05 ug/L] is recognized to be unachievable" is premature. Until an <br /> Amendment to the Record of Decision providing an alternate ACL is signed by all <br /> parties, the existing ACL of 0.05 ug/L for dieldrin will apply. Please qualify the <br /> statement regarding the dieldrin ACL. <br /> 2 <br />