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surrounding elevation (El. 6500). Al has continued to stockpile material stripped from <br /> mining activities within the Central Quarry in addition to jade air fines created during <br /> aggregate production in stockpiles above El. 6500. Al plans to utilize this material in future <br /> reclamation slopes within the South Quarry. <br /> Al is actively mining the South Quarry and hauling excavated material to the processing <br /> facility near the North Quarry for sale as commercial aggregate. During various visits to the <br /> site for this TR and for 2013-2016 Annual Reporting, GEI observed that mining activities in <br /> the South Quarry have occurred primarily on the western (east facing) mountain slopes. <br /> Three below-grade benches have been excavated down to about El. 6600 on the eastern side <br /> of the quarry. Al has begun reclamation on some areas within the South Quarry, primarily at <br /> the high elevation benches (El. 7450 up to El. 7550) on the west side of the quarry. Mine <br /> haul roads are frequently modified within the South Quarry to accommodate the changing <br /> highwall configuration. <br /> 1.2 Scope of Work <br /> GEI performed a field survey of the South Quarry using Unmanned Aerial Systems (UAS) <br /> flights to capture geo-oriented photography of the existing conditions. Geo-oriented <br /> photographs were used to generate a photogrammetric model and to generate contours of the <br /> existing topographic conditions within the South Quarry. All UAS flights were performed in <br /> accordance with Federal Aviation Administration (FAA) regulations by licensed remote <br /> pilots. A spotter was used during UAS operations to maintain a visual line-of-sight with the <br /> Unmanned Aerial Vehicle(UAV). Multiple flights were necessary to obtain the required <br /> photographs to generate topographic contours. <br /> Control points were established at the time of the aerial survey to rectify the <br /> photogrammetric model and to provide a reference benchmarks to assist with the <br /> photogrammetry. Control points are discernable landmarks or visible marks on the ground <br /> made with marking paint. <br /> After the site visit, GEI uploaded photos of the South Quarry into Pix4D software for <br /> generation of the photogrammetric model. Pix4D uses matching keypoints in overlapping <br /> photographs to tie the information together and develop a three-dimensional (313) mosaic of <br /> the site photographs. The 3D model is used to generate elevation contours from the <br /> photogrammetric model, which are exported for use in AutoCAD C1v113D. Elevation <br /> contours will be used to develop a surface within Civil3D and will be used to create <br /> representative site topography for use in stability analyses, highwall design <br /> recommendations, and reserve estimations. <br /> At various times during the project, the GEI project manager and/or a GE1 staff engineer or <br /> geologist traveled to the site to observe conditions within the South Quarry and to monitor <br /> drilling activities. <br /> Aggregate Industries Morrison Quarry GEI Consultants, Inc. <br /> South Quarry Highwall Design Technical Revision 2 August 2017 <br />