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<br />Ill 1111111111111111 <br />MEMORANDUM <br />TO: Dan Mathews <br />FROM: Mike Boulay <br />DATE: November 13, 2000 <br />SUBJECT: Deserado Mine; Permit No. C-8]-018; Technical Revision No. 51 and Technical <br />Revision No. 51 Amendment <br />I have reviewed the TR-51 and TR-51 amendment responses to our adequacy questions regarding <br />the East Portal Area, the Railroad Loop Area, and the Refuse Area Ponds at Deserado. I have the <br />following additional comments regarding BME's categorical responses. <br />TR-51 Adequacy Review Comments <br />1. The use of an average annual R of 16.6 is acceptable based on the documentation provided. <br />As requested, SEDCAD demonstrations for the 10-year, 24-hour precipitation event were submtted <br />for the East Portal Area and the Railroad Loop Area. The Division has the following adequacy <br />concerns regarding the new SEDCAD demonstrations for each area. <br />East Portal Area <br />la. Please provide the assumptions used in selecting the runoff curve numbers utilized in each <br />of the SEDCAD runs. This information should include the Hydrologic Soil Group, Hydrologic <br />Condition, and Cover Type. <br />Ib. Please provide justification and/or the assumptions used in selecting the C and P factors <br />utilized in each of the SEDCAD runs. This should include a description of the soil condition and <br />support practices to be used. <br />~~~ •% c-lde~ r~.SIC..I~/se~iiw.f4.-~yr°^`./...,,cn.+.l~`' <br />5.~,;,,~.~.w <br />lc. Two new ponds are proposed for the East Portal Area. The 25-year, 24-hour ~.~ ,~, <br />precipitation event SEDCAD demonstration needs to be submitted for Pond #1 and Pond #2. ~ `h <br />{~'f <br />~v`' <br />