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C- 1981 -008 TR -60 <br />PAR No. 2 <br />10- Nov -2011 <br />Page 4 of 4 <br />The Division has no adequacy concerns with the new discharge permit. However, the title of <br />Attachment 2.05.3(3) -18 has been altered with the addition of "JUNE 30, 2013 ". Please delete this <br />date from the title; it does not appear to correlate with any dates associated with the discharge <br />permit, and is confusing and unnecessary. Item resolved <br />6. Attachment 2.05.3(3) -24 —Pond 015 As -Built <br />a) Under the "Design" section on page 1, the three -year projected sediment accumulation is given <br />as 0.002 acre -feet. The volume anticipated in the Pond 015 design [Attachment 2.05.3(3) -22] <br />was 0.04 acre -feet. Please provide an explanation for the 95 % percent reduction in predicted <br />three -year sediment accumulation for Pond 015. Explanation provided; response accepted <br />b) As- built parameters for Pond 015 are provided on page 4. The Curve Number (CN) has been <br />reduced to 75.5 from the 83.5 presented in the original design for Pond 015. LISLE inputs are <br />tabulated on page 6, and an "Erodibility" value of 0.37 is used for each of the different land use <br />categories in this table. Please provide an explanation as to how this number was derived. <br />Explanation provided; response accepted. <br />7. Map 2.05.33) -19 Pond 015 As -Built —Contours and Cross Section <br />a) Please identify the limit of sediment storage elevation on the Cross Section. Item resolved. <br />b) Please generate an additional cross section running through the low point on the outer berm. <br />Item resolved. <br />c) The table in the upper right -hand corner appears to duplicate the Stage - Storage Report on page <br />6 of Attachment 2.05.3(3) -24. Please delete the table from this map, to avoid any future <br />confusion. Item resolved. <br />8. Map 2.05.3(3) -20 Pond 015 As-Built— Ditches and Culverts <br />The watershed area acreages on this map are shown in very small font. Please increase the font to <br />an appropriate size. Item resolved <br />This concludes the Division's second preliminary adequacy review for TR -60. Please contact me with <br />any questions you may have as you prepare your response to this review. <br />Sincerely, <br />Marcia L. Talvitie, P.E. <br />Environmental Protection Specialist <br />xc: Ross Gubka, P.E., Western Fuels — Colorado <br />Sandra Brown, DBMS <br />