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February 12, 2020 <br /> Mr. Tim Cazier, PE, Environmental Protection Specialist <br /> Colorado Division of Reclamation, Mining and Safety <br /> 1313 Sherman Street Rm 215 <br /> Denver, CO 80203 <br /> RE: TECHNICAL REVISION--PERMIT M-1991-083 ULA PIT, CUSTER COUNTY <br /> This Technical Revision to Permit #M-1991-083 is to address pit highwalls exposed <br /> during active mining operations not referenced in original <br /> Exhibit D—Mine Plan <br /> Active pit development as described in the original mine plan initiated in the northeast <br /> quadrant of the —40 acre parcel and to date has resulted in a —10 acre disturbed area <br /> including stockpiles, loading and gravel pit floor progressing westward. Near vertical <br /> highwalls are developed and progress to the west as the operating face. <br /> During active mine status, the pit may have up to 400 linear feet of highwall (10'- <br /> 12"high) exposed at maximum pit development prior to backfilling and grading north <br /> and south highwalls to final grade of 3:1, H:V. This equates to a fill volume of <br /> approximately —500 cubic yards of cut and fill material sourced from adjacent terrain. <br /> Fill material would be sourced from directly behind the highwall area pushed down with <br /> bulldozer. An estimated cost to fill this volume would be in the range of $0.501 cubic <br /> yard. <br /> While all other conditions noted in Exhibit D—Mine Plan, type of mining equipment <br /> used, short term location of crushing and screening plant as well as temporary asphalt <br /> plant siting will continue, the site may also be used for concrete waste recycling via <br /> crushing of spent concrete waste from mixer trucks as well as masonry waste materials <br /> crushed and blended into gravel products. Up to 250 tons of waste concrete may be <br /> stored on site between scheduled active crushing operations. <br />