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O TETRA TECH Updated Tucson South Proposed Gravel Mine Slope Stability Analysis <br /> November 8 2019 <br /> 5.0 LIMITATIONS <br /> The findings presented in this memorandum are based on information from previous geotechnical investigations <br /> at the site and strength parameters of the modeled materials provided by the Colorado Division of Minerals and <br /> Geology in 2004. Tetra Tech should be contacted if the mining plans change or if the subsurface conditions vary <br /> from the descriptions here as reevaluation may be necessary to the investigate potential effects of the changes on <br /> the factors of safety for the critical structures determined in this evaluation. Factors of safety for this evaluation <br /> were limited to effects at the critical manmade structures and were not an evaluation of the mining highwall and/or <br /> reclamation slopes. <br /> Please do not hesitate to contact us with any questions or comments. <br /> Sincerely, <br /> Jeffrey Butson, PE <br /> Project Engineer <br /> Tetra Tech <br /> 1900 S Sunset St, Ste 1-E <br /> Longmont, CO 80501 <br /> 720-864-4566 <br /> Jeff.Butson(c tetratech.com <br /> REVISION HISTORY <br /> 9/16/2019 <br /> • Revised offset table <br /> • Revised CAD cross section exhibits to add more detail <br /> • Revised Slope/W cross section exhibit to add more detailed dimensions <br /> o Computer analysis changed for Section M only <br /> o Computer analysis not changed for all other cross sections <br /> 11/8/2019 <br /> • Revised Figure 1 for amended project phasing <br /> Page 8 <br />