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ECS/MAC <br /> TR-8 <br /> April 20, 2022 <br /> REcavEo <br /> Mr. Eric Scott, P.G., R.G. <br /> Colorado DRMS MAY 16 2022 <br /> 1313 Sherman St., Room 215 DIVISION OF RECLAMATION <br /> Denver, CO 80203 MINING AND SAFETY <br /> Re: Aggregate Industries- Morrison Quarry <br /> 18129 Colorado Highway 8, Morrison, Colorado <br /> DRMS File M-1973-021-Technical Revision (TR08)for Biannual Inspections <br /> Dear Mr. Scott, <br /> On behalf of Aggregate Industries— WCR Inc. (AI), HDR Engineering, Inc. (HDR) is submitting this <br /> Technical Revision (TR)to the Colorado Division of Reclamation Mining and Safety(DRMS) 112 <br /> Construction Materials Reclamation Permit M-1973-021. This TR (TR08)summarizes the <br /> justification to change the biannual quarry face monitoring methodology from LiDAR to <br /> photogrammetry. <br /> Introduction <br /> As part of the Seventh Amendment (AM07)to the Permit M-1973-021,Aggregate Industries <br /> Morrison Quarry updated the highwall monitoring approach used to collect data summarized in <br /> the Morrison Quarry Annual Geotechnical Addendum.AM07 increased highwall monitoring to a <br /> minimum of biannual inspections and supplemented the monitoring plan to include scans of the <br /> rock face.The rock face scanning approach in AM07 utilized LiDAR mapping.Al has reviewed other <br /> scanning methodologies and will proceed with photogrammetry in lieu of LiDAR,a technology that <br /> provides high resolution scanning images and is more easily managed in the existing database. <br /> Basis for Change to Photogrammetry <br /> LiDAR techniques provide a point cloud image for the end user to measure and interpret the data <br /> points. Photogrammetry on the other hand incorporates photos of the site with the higher <br /> resolution point cloud data.This combination,especially when utilized in rock face scanning <br /> applications,creates an accurate 3D terrain model and permits the end user to more readily <br /> identify structural features within the rock, as well as lithology variations that may be present.This <br /> hdrinc.com <br /> 1670 Broadway,Suite 3400 <br /> Denver,CO 80202 <br />