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Hernandez, Alpha <br />From: Burgmaier, Susan <br />Sent: Thursday, July 05, 2012 10:39 AM <br />To: DRMS - Coal -Admin <br />Cc: Bowles, Brock <br />Subject: FW: Bowie No. 2 Mine (C1996083) MR -131 Adequacy Review <br />For Laserfiche. <br />Susan L. Burgmaier <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver CO 80203 <br />303 - 866 -3567 x 8111 <br />From: Burgmaier, Susan <br />Sent: Thursday, July 05, 2012 10:17 AM <br />To: Bowles, Brock <br />Subject: Bowie No. 2 Mine (C1996083) MR -131 Adequacy Review <br />Brock— I have completed my adequacy review of the materials submitted in support of the MR 131 application for the <br />Bowie No. 2 Mine. I have the following comments, and request that you forward them to the operator. <br />The newly revised page EXH. 8 -29i does not coincide with the currently approved page. The currently approved pages <br />EXH. 8 -29 and 8 -29i have ditches C10 and C11 at the bottom of page 8 -29, and C11 and C12 at the top of page 8 -29i. <br />The new page 8 -29i starts off with C13, so C12 is omitted. Please revise page 8 -29i to include C12. <br />The rip rap sizing calculations on pages EXH. 8 -252 and EXH. 8 -253, resulting in a required D50 of 0.83' for Ditch D3 -1 <br />and D3 -2 and 1.17' for Ditch D -3 -3 appear to be in error. Using the same equation, DRMS calculations show a required <br />D50 of 1.64 for Ditch D3 -1 and D3 -2 and 2.55' for Ditch D3 -3. Please review the calculation to verify and correct the <br />calculations and revise the pages accordingly. <br />Should you or the operator have questions or need additional information, let me know. <br />Susan L. Burgmaier <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver CO 80203 <br />303 - 866 -3567 x 8111 <br />