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' I. INTRODUCTION <br />' 1.01 General <br /> On behalf of Aggregate Industries West Central Region, Inc. (Aggregate Industries), Haley & <br />' Aldrich, Inc. (Haley & Aldrich) has prepared this Geotechnical Addendum to the 2002 Notice <br /> of Intent to Continue Mining Operations/Annual Report for the subject Regular (112) Mining <br /> and Reclamation Permit. This conforms to Rule 6, Section 6.5 and is also required to comply <br />' with Permit Amendment No. 5, carried over from Permit Amendment Nos. 3 and 4. <br /> Specifically, this exhibit provides supplemental data required by the Division of Minerals and <br /> Geology (DMG) per Stipulation No. 4 in the Letter of Conditional Approval of Amendment <br />' 4, dated 16 February 1995. <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:1~ slopes <br /> with maximum highwalls not exceeding MSHA regulation requirements, except the east side <br /> of the Central Quarry, are implemented without special geotechnical analyses based on prior <br /> analyses of global conditions at the quarry. In the east side of the Central Quarry, the default <br />' slopes are 40 feet (fr) highwalls and 50 to 60 fr benches. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />G9PROlECTS\20200 Morrison Quarry\008\2002\2002 ~eotechnical addendum.doc <br />