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@� LFR <br /> RESPONSE <br /> The proposed three-dimensional groundwater flow model will include simulation of groundwater <br /> flow conditions in both A- and B-zones beneath the Site. Both A- and B-zones will be modeled as <br /> distinct layers and an evaluation of the effects of aquifer pumping within one zone on the other <br /> zone will be evaluated. LFR acknowledges the importance of the storage effects of the A/B <br /> aquitard and, as such, its effects on water levels within the A- and the B-zones will be explicitly <br /> modeled. <br /> COMMENT 5 <br /> An inconsistency exists between the planned depth of B-zone wells between statements in the main body of the text(Sections <br /> 3.3.2 and 3.4.2)and Appendix A(Sections A3.1 and A3.2)of the Phase III plan. The main text states that the anticipated <br /> depth for B-zone wells is approximately 140 ft bgs, whereas Appendix A states that the anticipated depth of B-zone wells is <br /> 120 ft bgs. Because the B-zone is described as extending to a depth of approximately 145 ft bgs in Section 2.3.3 of the Phase <br /> III Plan, LPL trusts that the 140 ft depth stated in the train body of the text is most reflective of LFR's tentative plans for B- <br /> zone well completions. <br /> RESPONSE <br /> During the implementation of the Phase III IRA, B-zone extraction wells will be installed to the <br /> base of the B-zone or to the top of the B/C aquitard that separates the B-zone from the underlying <br /> C-zone beneath the Site. The actual depths and screen intervals of B-zone extraction wells will <br /> depend on field lithologic conditions. <br /> If you have questions or comments, please call the undersigned. <br /> Sincerely, <br /> Donald T. Brads <br /> Principal Hydrogeologist <br /> MAA REVISIONS-rsp-PhucIU-IRA-06752:DEH 5 <br />