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OL TETRA TECH Updated Tucson South Proposed Gravel Mine Slope Stability Analysis <br /> ■ti July 3,2019, 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 /> L 1 <br /> Jacob Jansen, El Derek Foster, PE <br /> Geotechnical Engineer Tetra Tech <br /> Tetra Tech Senior Project Manager <br /> 1560 Broadway, Suite 1400 1560 Broadway, Suite 1400 <br /> Denver, CO 80202 Denver, CO 80202 <br /> 720-931-9363 720-931-9344 <br /> Jacob. derek.foster(a-)tetratech.com <br /> Page 8 <br />