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TR04 Adequacy Review 1 <br /> Derr Pit(Permit M-2008-017) <br /> Page 2 of 2 <br /> With respect to the proposed re-contouring of the area between Phases 1-2, and Phases 5-7, <br /> DRMS will need to review additional cross-sections through this area depicting the proposed <br /> surface, and additional stability analysis. <br /> Please provide additional cross-sections depicting the surface of the proposed area of regrading <br /> and the adjacent developed water storage area in Phases 5-7 at the maximum water level. <br /> DBMS suggests at least one E-W and one N-S oriented section at a minimum. It would also be <br /> very useful to include the existing surface on these figures as a reference. <br /> Please also provide additional stability analysis showing that the proposed regrading will not <br /> have any adverse impact on the stability of the developed water storage body at maximum <br /> capacity. These stability analyses should include relevant factors that could influence stability, <br /> such as the slurry wall itself, or other subsurface structures or surface loads. Again, including a <br /> comparison to the existing conditions would be extremely useful. <br /> This concludes the Division's adequacy review of TR04. This letter shall not be construed to <br /> mean that there are no other technical issues in the submittal. Other issues may arise as <br /> additional information is supplied. <br /> If you have any questions, please contact me at (303) 866-3567 x8140. <br /> Sincerely, <br /> Eric Scott <br /> Environmental Protection Specialist <br />