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?y Mr. Ross Gubka, P.E. <br />Western Fuels-Colorado <br />January 28, 2008 <br />Page 4 <br />minimum of between 0.5 to 1.0 ft between the top of sediment storage and the <br />low-hole spillway. Please revise the As-Built Certification report and if <br />appropriate other permit text as needed to clearly explain how Pond 013 will <br />be operated. The revised Certification report and permit text shall provide <br />a demonstration of compliance with Rules 4.05.6(3) (b) and 4.05.2(7). This <br />demonstration should identify the maximum sediment storage volume, <br />cleanout level, and the estimated periodic sediment removal interval. <br />Compliance with these permit commitments including documentation of the <br />existing storage capacity shall be provided annually in the Annual <br />Certification for Impoundments required by Rules 4.05.9(14) and (15). <br />3. Please provide the Division with an updated NPDES Discharge Permit for <br />inclusion in the permit document. The copy currently in the permit <br />application package is expired (March 31, 2007) and does not have Outfall <br />013 in the approved permit. <br />If you have any questions or require additional information please call me. <br />Sincerely, <br />/7l; c11' f 50xhp? <br />Michael P. Boulay <br />Environmental Protection Specialist <br />Cc: Denver File <br />Marcia Talvitie