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On page Exh 13A-T3-1 Colowyo lists a cost for reseeding (including discing the <br />area, seed costs and seeding costs) at $184.21/acre. This cost is a weighted <br />average of the grassland seed mix and the sagebrush steppe seed mix. Based on <br />the Division's calculations, the cost for reseeding the grassland seed mix is <br />$497.83/acre and the cost for reseeding the sagebrush steppe seed mix is <br />$810.29/acre. Please review the Division's reseeding cost sheets (attached) <br />and revise the cost estimate as necessary. <br />Rule 4.05.4 - Stream Channel Reconstruction <br />12. Response Accepted. Colowyo has added flow direction arrows to Map 41 A as <br />requested. <br />Rule 4.09.2 - Excess Spoil <br />16. Response Accepted. Colowyo has provided revised page South Taylor/Lower <br />Wilson - Rule 4, Page 19 as requested. <br />New Adequacy Questions Based on Colowyo's 1 June 2010 Responses <br />35. Response partially accepted. <br />a. Tributary ditch B empties onto the undisturbed area on the side of a ridge and was <br />not present in the pre-mining topography. Please route tributary ditch B so that <br />it empties into a natural drainage. <br />b. All issues with tributary D have been resolved. <br />c. Tributary E empties into no apparent existing channel and appears to be <br />unnecessary as no drainage was present in the pre-mining topography. Tributary <br />E can be eliminated. <br />d. Tributary G appears to be misaligned based on the post-mining topography and/or <br />may need an additional branch to the west. Please review tributary G and <br />make corrections as necessary. <br />e. Tributary H appears misaligned to the east due to the flat 7900 foot contour <br />bench. !Please review tributary G and make corrections as necessary. <br />This concludes the Division's fourth adequacy review of the Colowyo TR-81. The <br />proposed decision date for this revision is 31 May 2011. Colowyo's prompt responses to <br />this letter will ensure meeting this proposed decision date. The Division believes that, in <br />the interest of an expedited review, a short conference call may be warranted to address <br />the new cost estimate and remaining tributary issues. Please call me at (303) 866-3567 if <br />you have any questions or comments regarding this letter or if you would like to schedule <br />a conference call. <br />