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■r v <br />COAL <br />44 COMPANY G.� <br />pEOpl'E•ARODUCTION* <br />E <br />volume and storm detention volume for use in the required annual <br />inspection. CCC is setting the elevation of the lowest ungated overflow <br />(generally, the lowest hole in a perforated riser) as the sediment storage <br />volume. Comparison of the storage volume below this point to the <br />estimated annual sediment inflow calculated by SEDCAD represents in <br />our professional opinion the best way to perform this calculation on a <br />consistent basis. To the extent that the annual inspections are required to <br />be performed and certified by a professional engineer, we believe this <br />approach removes much of the ambiguity that may currently exist as a <br />result of the several approaches that have been used in the past to make <br />this calculation. <br />DRMS July 2, 2012 Follow up Comment to Comment 4 above: <br />Regarding other changes to Exhibit 7, please explain the rationale <br />behind all substantive changes. In particular, please explain the <br />reasoning for updating the sediment loading parameters in Table 6. <br />Colowyo's Second Round Response to Original and Follow up Comment 4: <br />DRMS did not address Colowyo's response to it's original comment, <br />restating the original comment in its entirety. <br />Colowyo believes that the response provided to this comment on June 25, <br />2012 was clear, informative and sufficient to address the Division's <br />concerns and requests that this be documented in the Divisions next <br />communication regarding this matter. <br />If you should have any additional questions or concerns please feel free to contact <br />me at your convenience at (970) 824 -1532. <br />Sincerely, <br />Tony Tennyson <br />Senior Engineer - Environmental <br />Cc: file CF 1.1.2.84 <br />A Western Fuels - Colorado, LLC mining property <br />