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<br />' I. INTRODUCTION <br />1.01 General <br />' On behalf of CAMAS Colorado, Inc. (CAMAS), Haley & Aldrich, Inc. (Haley & Aldrich) <br /> has prepared this Geotechnical Addendum to the 1999 Notice of Intent to Continue Mining <br /> Operations/Annual Report for the subject Regular (112) Mining and Reclamation Permit. <br />' This conforms to Rule 6, Section 6.5 and is also required to comply with Permit Amendment <br /> No. 5, carried over from Perntit Amendment Nos. 3 and 4. Specifically, this exhibit <br /> provides supplemental data required by the Division of Minerals and Geology (DMG) per <br /> Stipulation No. 4 in the Letter of Conditional Approval of Amendment 4, dated 16 February <br />' L995. <br /> 1.02 Purpose and Scope <br /> The permit Amendments describe in detail an "Observational Method" to mine slope <br /> development being implemented at the quarry whereby conservatively designed "default" <br />' slope angles may be modified to steeper configurations based on ongoing observation of slope <br /> performance, collection of rock mass property data, and slope stability evaluations. Default <br /> slope angles consist of a one to one ratio of highwall height to bench width (1H:lV) slopes <br />with maximum 80 ft highwalls and 80 ft benches everywhere, except the east side of the <br /> Central Quarry, are implemented without special geo[echnical analyses based on prior <br /> analyses of global conditions at the quarry. <br />' <br /> In the east side of the Central Quarry, the default slopes are between 1.25H:1V and 1.5 H:1V <br /> (40 ft highwalls and 50 to 60 ft benches above elevation 6,520. The default slope below <br /> elevation 6,520 is IH:IV (40 ft highwalls and 40 ft benches). <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />(. \PROI COTS\2020D Murnwn Qu:uryVgF\1900\ncx0(hnarkup.Ja <br />