Laserfiche WebLink
INTRODUCTION <br /> ' On behalf of CAMAS Colorado/Cooley Gravel Division (CAMAS), Haley & Aldrich, Inc. <br /> (Haley & Aldrich) has prepared this Geotechnical Addendum to the 1997 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 with <br /> the conditional approval of Permit Amendments Nos. 3 and 4. Specifically, this exhibit provides <br /> supplemental data required by the Division of Minerals and Geology (DMG) per Stipulation No. <br /> ' 4 in the Letter of Conditional Approval of Amendment 4, dated 16 February 1995. <br /> The permit amendments describe in detail an "Observational Method" to mine slope <br /> development being implemented at the quarry whereby conservatively designed "default" slope <br /> 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 slope <br /> ' angles consist of 1H:1V slopes with maximum 80 ft highwalls and 80 ft benches everywhere <br /> except the East Highwall of the Central Quarry and these are implemented without special <br /> geotechnical analyses based on prior analyses of global conditions at the quarry. In the Central <br /> Quarry, 1.5H:1V default slopes (40 ft highwalls and 50 to 60 ft benches) were recommended as <br /> part of a slope failure repair design included in the referenced permit amendments. <br /> 1 GAP ROJ ECTS\-202 00V002V97AN N R PT.W PP <br />