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1 <br />' TABLEI <br />JOINT SETS MAPPED: CENTRAL QUARRY AND NORTH QUARRY <br />2000 GEOTECHNICAL ADDENDUM <br />MORRISON QUARRY <br />MORRISON. COLORADO <br /> <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br /> <br /> <br />1 <br /> <br /> <br /> <br />1 <br />Joint Set Range of Range Effects to Localized and Overall Slope Stability <br /> Strike Bearing of Dip <br />Benches B,C, and D of the Central Quarry <br />Primary 125 205 25 ~ 60 Localized: When in conjunction with secondaryjointing: loose <br />(oriented ~ ~ blocks, wedges, and slabs exist on these joint surfaces, resulting <br />along in local instability on the outside edges of individual benches. <br />foliation) <br /> Overall: On the east side, primary jointing geometry is typically <br /> I adverse for slope stability. However, because joint surfaces <br /> i appear to be discontinuous and undulating within the overall <br /> I slope, and rock mass conditions at lower elevations on the slope <br /> ~ l are "competent", the overall slope appears stable. Historical the <br /> ' i only slope instability was encountered near the ground surface <br /> and had continuous joint surfaces and "poor" rock mass <br /> I ~ characteristics. <br />Secondary 105 ', 115 70 i 90 Localized: May result in relatively small, unstable toppling blocks <br /> on edges of individual benches. Otherwise no apparent effects. <br /> i Overall: No apparent effects. <br /> 060 ~I 090 90; 90 Localized: May result in relatively small, unstable toppling blocks <br /> ' i on edges of individual benches. Otherwise no apparent effects. <br /> Overall: No apparent effects. <br /> 345 360 35 i 60 Localized: Jointing at northwest end creates adversely oriented <br /> I i blocks on individual benches, however joint surfaces are fresh to <br /> slightly weathered. <br /> j I Overall: No apparent effects, joint surfaces are tight and <br /> ~ discontinuous. <br />Benches 4, 5, 6, 7, and 8 of the North Quarry <br />Primary 135 I 180 20 i, 50 Localized: No apparent effects. <br />(oriented <br /> <br />along <br />foliation) i <br />Overall: No apparent effects. <br />Secondary 090 j 130 70 190 Localized: May result in relatively small, unstable toppling blocks <br /> ! on edges of individual benches. Otherwise no apparent effects. <br /> Overall: No apparent effects. <br /> 000 ~ 050 60 90 Localized: May result in relatively small, unstable toppling blocks <br /> on edges of individual benches. Otherwise no apparent effects. <br /> I Overall: No apparent effects. <br />Notes: "Localized" slope refers to the slope associated with an individual bench and associated highwall. <br />"Overall" slope refers to the entire slope of a mined area. <br />1 <br />