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Jared Ebert <br /> July 8, 2019 <br /> Page 3 of 18 <br /> 8. Page D-5 discusses procedures to be followed for sloping within the regulatory floodplain. It is <br /> unclear if the applicant is proposing to maintain 3H:1V slopes within the floodplain during the flood <br /> season (April 1 through September 30), please clarify? <br /> The applicant will maintain 3H:1V slopes in each of the mine areas cells during the flood <br /> season (April 1-September 30). The 3H:1V slopes would be limited to the south and west <br /> slopes because this is the anticipated direction from which flood waters would enter any <br /> cell. If any area along the south or west highwall is mined at a slope steeper than 3H:1V <br /> during the flood season, the applicant will use concurrent reclamation to restore the slopes <br /> to 3H:1V as they mine the material. <br /> 9. The Table on page D-6 describes when in the mining process the disturbance could be at its <br /> maximum. The active mining area is shown to have a near vertical face of 800 feet and the highwall <br /> with adjacent cells walls will be 1,500 feet in length. However, page D-4 indicates the mining <br /> highwall may extend no more than 4,000 feet in length. Please explain the large difference in the <br /> highwall lengths discussed on page D-6 and D-4. At what point during the mining operation would <br /> the highwall reach 4,000 feet? <br /> All tables have been revised to reflect a maximum of 1500 feet of highwall at any given time <br /> during the mining and reclamation process. <br /> Rule 6.4.5, Exhibit F — Reclamation Plan <br /> 10. Condition number 1 of the Mined Land Reclamation Board's ("MLRB" or"Board") approval of the <br /> original application for the site required the Applicant to provide the Division a copy of the final <br /> version of the specifications of the slurry wall if they differed from the draft specifications approved. <br /> Page E-4 indicated the Applicant is working with another consultant on the final design of the slurry <br /> wall. Please commit to providing a Technical Revision to revise the slurry wall design and add <br /> language to Page E-4 of the reclamation plan for this commitment. <br /> Aggregate Industries will provide a Technical Revision to revise the Slurry Wall design. <br /> Exhibit F has been revised to reflect this commitment. <br /> 11. The temporary stockpile stabilization mixture shown on Page E-6 is different than the proposed <br /> mixture on Page D-5 of the Mining Plan. Please clarify this discrepancy and revise these pages so <br /> a consistent seed mixture is proposed for soil stockpile stabilization. <br /> The mixture on page D-5 has been revised to be consistent with the mixture shown on Page <br /> E-6. <br /> 12. Page E-2 indicates cottonwood trees and shrubs will be planted along the eastern side of the east <br /> cell. For the cottonwood trees please indicate the number of trees to be planted and the type of <br /> nursery stock to be planted (bare root, containerized, tubling, etc.). Please specify the species of <br /> shrubs to be established and the type of nursery stock to be planted. Also, please provide <br /> information on when and how trees and shrubs will be planted. Please revise the reclamation plan <br /> exhibit to include this information. <br /> Aggregate Industries—WCR,Inc <br /> 1687 Cole Blvd Suite 300 <br /> Golden,CO 80401 <br />