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' I. INTRODUCTION <br />1.01 General <br /> On behalf of CAMAS Colorado/Cooley Gravel Division (CAMAS), Haley & Aldrich, Inc. <br />' (Haley & Aldrich) has prepared [his Geotechnical Addendum to the 1998 Notice of Intent to <br /> Continue Mining Operations/Annual Report for [he subject Regular (112) Mining and <br /> Reclama[ion 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 Stipula[ion No. 4 in the Let[er of Conditional Approval of Amendment <br />' 4, dated 16 February 1995. <br />~ 1.02 Purpose and Scope <br />' T <br />" <br />" <br /> he permit Amendments describe in detail an <br />Observa[ional Method <br />to mine slope <br /> development being imp]emented at [he 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 V) slopes <br /> with maximum 80 ft highwalls and 80 ft benches everywhere, except the east side of the <br />' Cenral Quarry, are implemented wi[hou[ special geotechnical analyses based on prior <br /> analyses of global condi[ions at the quarry. In the east side of [he Central Quarry, 1.SH:1 V <br /> default slopes (40 ft highwalls and 50 to 60 ft benches) were recommended as part of a slope <br />' failure repair design included in the referenced permit amendments. <br />LJ <br /> <br />1 <br /> <br />1 <br /> <br />1 <br /> <br />' G ~PROIECT5~3@00 Alornwn Qwrry~00:~nnnutl Rcpon Gmin~M1nmy ntlaendum4998\98rpi rturtup dw Page 1 <br />