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I~1 <br />' t. INTRODUCTION <br />1.01 Genera{ <br />' On behalf of Aggregate Industries West Central Region, Ina (Aggregate Industries), Haley & <br />Aldrich, Inc. (Haley & Aldrich) has prepared this Geotechnical Addendum to the ?000 Notice <br />of Intent to Continue Mining Operations/Annual Report for the subject Regular (I l2) 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. S and 4. <br />Specifically, this exhibit provides supplemental data required by the Division of Minerals and <br />t 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:IV) 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 (ft) highwalls and 50 to 60 ft benches. <br />i <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />G9PROlECTSV0200 Morrison Quarry~008~2pJ04epon V000 geamchnical addendum.doc <br />