Laserfiche WebLink
i` <br />6. A few of the SEDCAD+ hydrology pages appear to have been mislabeled. Cl~lvert <br />J (file name C:\SEDCAD\JCULVF2 should be labeled Culvert F. Culvert I (file <br />name C:\SEDCAD\CULVK) should be labeled Culvert K. Please revise these <br />pages accordingly. ~ <br />7. In attachment B, Colowyo used the Tipton and Kalmbach inputs in SEDCAD+. The <br />pipe slopes used in the SEDCAD+ model are different than what is currently in the <br />permit pages. Please clarify this discrepancy with the Division. <br />8. In the technical revision, Colowyo included designs for the sediment control ditch <br />located east of the 015 Auxiliary Coal Crusher. The following comments are related <br />to this ditch; <br />a. Colowyo calculated the disturbed area to be 8 acres. The Division calculated <br />roughly 12 acres in this watershed. Please reevaluate the acreage figure and <br />revise the SEDCAD+ model accordingly. <br />b. This diversion ditch should also be depicted on the Hydrology South Map 12. <br />Please revise the Hydrology South Map to include this diversion ditch. <br />c. Colowyo used a landflow condition of 7 in the SEDCAD+ model. A landflow <br />condition of 8 is normally used for diversion ditches and low flowing streams. <br />Please revise the model accordingly. <br />9. The Division is unclear as to where these revise pages should be inserted in the <br />permit once the revision is approved, and which pages will be removed from the <br />permit. Please provide the Division with insertion and removal instructions. <br />The Division's decision due date for this technical revision is November 23, 1996. Please <br />respond to these concerns prior to this date. if you have any questions, please do not <br />hesitate to call. <br />~. <br />~_~~ ~~ <br />Erica S. Crosby <br />Environmental Protection Specialist <br />Since ely, <br />~~ <br />c:\wp51\colowyo\951016 <br />