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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 C O L O R A D O <br />Phone: (303) 866-3567 DIVISION O F <br />RECLAMATION <br />FAX: (303) 832-8106 MINING <br /> -&- <br /> SAF SAFETY <br />MEMO <br /> Bill Ritter, Jr. <br /> Governor <br />Date: November 29, 2010 <br /> Mike King <br /> Executive Director <br />To: File <br /> <br />Carbon Junction Mine (C-92-080), SL-4 Loretta E. Pineda <br />Director <br />Determination of Drainage Area of <br />Triple Culvert in East Collection Ditch <br />From: Tom Kaldenbach f"r-- <br />Beginning with the DRMS inspection of March 25, 2009, several DRMS inspection <br />reports have noted the lack of positive drainage at the inlet end of the triple culvert in the <br />East Collection Ditch. Inspection reports since that time have noted that additional <br />permit boundary markers are needed in the area of these culverts. Markers would enable <br />an inspector to determine the location of the triple culvert relative to the coal permit <br />boundary and the sand and gravel permit boundary. <br />The operator installed a permit boundary marker on October 6, 2010 near the inlet end of <br />the triple culvert. The marker appears to be located at the sharp turn in the permit <br />boundary at that location. Although impounded water at the inlet end of the triple <br />culvert appears to be in the sand and gravel permit area, at least 40% of the drainage area <br />that reports to the culvert inlet area is in the coal permit area (see attached sketch map). <br />cc: Dan Hernandez <br />Office of Office of <br />Mined Land Reclamation Denver - Grand Junction - Durango Active and Inactive Mines