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I. INTRODUCTION <br /> On behalf of CAMAS Colorado/CooleyGravel Division(CAMAS), Hale &Aldrich, Inc. <br /> Y <br /> ' (Haley & Aldrich) has prepared this Geotechnical Addendum to the 1996 Notice of Intent to <br /> Continue Mining Operations/ Annual Report for the subject Regular (112) Mining and <br /> Reclamation Permit. This conforms to Rule 6, Section 6.5 and is also required to comply <br /> with the conditional approval of Permit Amendments Nos. 3 and 4. <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 1H:1V slopes with 80 ft highwalls and 80 ft benches everywhere <br /> except the East Highwall of the Central Quarry where 1.511:1V slopes (40 ft highwalls and 60 <br /> ft benches) were recommended as part of a slope failure repair included in the referenced <br /> permit amendments. Specifically, this exhibit provides supplemental data required by the <br /> ' Division of Minerals and Geology (DMG)per Stipulation No. 4 in the Letter of Conditional <br /> Approval of Amendment 4, dated 16 February 1995. <br /> 1 G:\PROJEM\20200\002\96ANNRPr.WPD <br />