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In our review of the study, we noted that historical aerial photography indicates that <br /> Pool 1 is not present prior to the September 2013 flooding and that the short <br /> history of the pool would indicate that additional pools could be established as part <br /> of floodplain reclamation, even if the water rights issues require the retention pond <br /> to be backfilled as part of the pit and highwall reclamation. <br /> BCPOS also states that it is currently unclear how this reach of the St. Wain will be <br /> restored, that any effort to construct replacement habitat will take multiple years, <br /> and that the reach is currently unfunded. <br /> Similar to our response to Comment No. 1, given that the plan for restoration of the <br /> Lyons Quarry "meadow"area will not be implemented until sometime in the future, <br /> our approach will be to collaborate with Boulder County in maintaining the desired <br /> frog and bat habitat, understanding that water rights issues must be resolved and <br /> that the replacement habitat will take multiple years to construct. Our approach <br /> again will be to submit a future Technical Revision based on a collaborative plan <br /> for the future reclamation. <br /> 6.5 Geotechnical Stability Exhibit <br /> 2. The final grading plan presented in Technical Revision No. 2 (TR02) does not <br /> appear to follow the recommendations in the Engineering Stability Analysis <br /> prepared by Kleinfelder in 2008. In order to proceed with the review of the <br /> Geotechnical Stability Analysis, the Division will require verification from Kleinfelder <br /> that the grading plan presented in TR02 meets the geotechnical specifications of <br /> the Engineering Stability Analysis (2008). The documentation from Kleinfelder shall <br /> include a P.E. seal. If the proposed grading plan does not meet the geotechnical <br /> specifications of the Engineering Stability Analysis, then a new analysis will need <br /> to be prepared. <br /> Response: <br /> The 2008 Kleinfelder Engineering Stability Analysis summary report states that the <br /> existing highwall and rock slopes can be left in place with no modifications where <br /> they will be completely covered by stable fill slopes. Regarding the fill slopes, the <br /> summary report states that existing fill slopes and future constructed fill slopes can <br /> be graded to a final configuration as follows: <br /> • Bench Slope Angle 26.6 degrees or 2H:1 V <br /> • Maximum Bench Height 50 feet <br /> 13 <br /> hdrinc.com <br /> 1670 Broadway, Suite 3400, Denver,CO 80202-4824 <br /> (303)764-1520 <br />