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10/24/2016 State.co.us Executive Branch Mail - Re: TR70 and SEDCAD model <br />STATE OF Hernandez - DNR, Alysha <aIysha.hernandez@state.co.us> <br />COLORADO, <br />Thanks, Scott. You have answered my questions sufficiently. <br />Alysha, please file this as correspondence under Deserado TR -70, and name it "Discussion of SedCAD questions." (No <br />need for attachments in LF) <br />HU <br />Rob Zuber, P.E. <br />Environmental Protection Specialist 11 <br />Coal Regulatory Program <br />P 303.866.3567, extension 8113 1 F 303.832.8106 <br />1313 Sherman Street, Room 215, Denver, CO 80203 <br />rob.zuber@state.co.us I http://mining. state. co. us <br />On Thu, Oct 20, 2016 at 10:49 AM, Scott Wanstedt <swanstedt@deserado.com> wrote: <br />Rob, <br />Attached are the PDF files for the revised models we have been discussing. I'll send another email with the <br />compiled version with the models and supporting materials ordered for inclusion in our permit. <br />"111111111110 Em <br />3) The long clewatering time for Pond 4 was the result of a bug in the program related to the user defined <br />�ischarge spillway option to input values for the 0.7S' H -flume. A solution was found for this bug and the models <br />now show a more reasonable clewatering time. <br />4) The PSID is effected by the character of the various inflows. The only input we have is for the initial sediment <br />characteristics which uses the standard Deserado Mine PSID we've used for over 20 years. SedCAD calculates all the <br />values you reference internally and without doing an in-depth analysis of each inflow it is difficult to say with <br />certainty why this is happening. I would speculate it has to do with the slightly larger curve number for the native <br />watershed of Structure 5 along with the slightly greater slope resulting in a coarser sediment reaching Structure 5. <br />5) There are two drill holes on one large pad. 'SH -4' is the SAE designation for Map 147 and represents this larger <br />pad. 'SH -4a' is the hole used for air and 'SH -4d' is the hole used for clewatering. Map 160 is of a scale and detail <br />namicamallaraffmans ammomammom, sam <br />hftps://mail.google.com/mail/u/0/?ui=2&ik=e29129fcb5&view=pt&search=inbox&th= 157e32855f417db4&Siml= 157e32855f417db4 1/2 <br />