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G `I Consultants <br /> June 15, 2020 <br /> Consulting Project No. 1705051 <br /> ' <br /> Engineers and <br /> Scientists <br /> Mr. Eric Scott, P.G., R.G. <br /> ' Colorado DRMS <br /> 1313 Sherman St., Room 215 <br /> Denver, CO 80203 <br /> ' Re: Morrison Quarry; DRMS File M-1973-021-Technical Revision (TR-06) for Haul <br /> Road Construction <br /> Dear Mr. Scott: <br /> ' On behalf of Aggregate Industries—WCR Inc.(AI),GEI Consultants, Inc.(GEI)is submitting this <br /> Technical Revision (TR) to the Colorado Division of Reclamation Mining and Safety (DRMS) <br /> 112 Construction Materials Reclamation Permit M-1973-021. This TR(TR-06)summarizes plans <br /> ' to construct a haul road that will enable AI to initiate South Quarry highwall reclamation and <br /> advance plans to mine and reclaim the West Quarry. <br /> tINTRODUCTION <br /> Within the Morrison Quarry, Al is planning to initiate South Quarry highwall reclamation in the <br /> fall of 2020 and prepare to develop the West Quarry for mining in the near future, as market <br /> conditions dictate. A key component of these plans is to establish a new haul road for construction, <br /> mining access,and reclamation activities. This letter is intended to provide a TR-06 to the existing <br /> mining permit M-1973-021 AM-05 in support of haul road construction. <br /> HAUL ROAD DESIGN SUMMARY <br /> The proposed haul road configuration is shown on attached Figures 1 and 2. The haul road will <br /> start at the South Quarry (El. 6750) and end near the top of the proposed West Quarry(El. 7275). <br /> The road will be approximately 4,000 feet long, 75 feet wide, have an average grade of 13.9%, <br /> and will have 8 foot-high safety berms on the road edges. The estimated volumes for road <br /> construction include 80,000 yd3 of cut material, and 389,000 yd3 fill. The road will be built in <br /> compacted lifts using on-site materials. Backfill slopes will be placed at a slope ranging from <br /> 1 H:1 V to 1.25H:1 V. <br /> AI intends for the footprint of the road to change over time as the West Quarry is mined. The <br /> planned road spur heading to the South Quarry will be maintained until the South Quarry highwall <br /> reclamation operations above El. 7200 have been completed sufficiently. The final South Quarry <br /> road alignment is still pending, and will be finalized in conjunction with AM-07. <br />