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.1 III IIIIIIIIIIIIIIII~ <br />~~ STATE OF COLORADO <br />DIVISION OF h11NERALS AND GEOLOGY oe~co~ <br />Department o(Natural Resources ,~c: 44FFpp~~~~11~~----~ <br />Ne~O <br />171 1 Sherman bl., Ruom 215 „~, ~•y', <br />Denver, CO BU_03 ' `r e'~~ <br />Phone: 1303) 866-7567 <br />FA,I': 1 }031 83 2-8 1 Ob Rov Romer <br />Governor <br />Michael B. Long <br />Division Director <br />MEMO <br />DATE: February 24, 1993 <br />TO: Janet Binns <br />ti~ <br />FROM: Susan Momson '~~ <br />RE: Deserado Mine (C-S1-018) <br />Technical Revision 31 <br />I have reviewed information pertaining to the hydrologic feasibility of the above mentioned <br />revision. Specifically, I reviewed the sizing of the SDH#4 flow cell and process pond, SDH#4 <br />discharge conveyance structures, and the sizing of the culvert which will be placed in the dry <br />wash for access to SDH#4. I did not review information regarding the temporary bridge, <br />power line extension, access to the ventilation holes, or the bonding requirement for any of <br />the proposed activities. Attached are my comments and questions concerning the sump <br />dewatering system and culvert. If you or the operator have any questions, let me know. <br />SLM\022493.WP <br />