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7. Limitations <br /> This TR was prepared for the exclusive use of Al for the permitting of the revised highwall <br /> configurations within the Morrison Quarry South Quarry through the Colorado DRMS. Our <br /> analyses and recommendations may require modification if there are any changes in the <br /> nature, composition, structural characteristics, etc. of the base rock material within the <br /> highwalls exposed by mining within the South Quarry. <br /> The recommendations in this report are based in part on the data obtained from rock core <br /> borings conducted by multiple parties over the entire development phase of the South <br /> Quarry. Subsurface conditions between exploration locations may differ significantly from <br /> those encountered. Additionally, GEI Annual Report mapping data from 2015, 2016, and <br /> 2017 was utilized. This data, while developed to be as accurate and representative as <br /> possible, was obtained from a"safe distance" from the active highwall (-30 to 50 feet)to <br /> ensure field staff safety and was not obtained from final highwall locations,but rather active <br /> mining fronts. <br /> Significantly differing subsurface conditions could affect the results of our analyses and the <br /> recommendations presented herein. If variations from the anticipated conditions are <br /> encountered, it may be necessary to revise the recommendations in this TR. It is important to <br /> re-evaluate modes of failure potential with relevant geological characteristics such as <br /> discontinuities (spacing, continuity, shear strength); bench orientations relative to the <br /> highwall face; and bench properties that contribute to rock mass behavior as new geological <br /> information becomes available. Therefore, we recommend that GEI be engaged to make site <br /> visits during all phases of mining activity construction to: a) check that the subsurface <br /> conditions exposed during construction are in general conformance with our design <br /> assumptions, and b) ascertain that, in general, the geotechnical aspects of the work are being <br /> performed in compliance with this TR. <br /> Our professional services for this project have been performed in accordance with generally <br /> accepted engineering practices; no warranty, expressed or implied, is made. <br /> Aggregate Industries Morrison Quarry GEI Consultants, Inc. <br /> South Quarry Highwall Design Technical Revision 31 August 2017 <br />