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August 1999 Seneca Con1 Cornparn' * Yonst Mine Hnal Road U Smbitin' Anah~sis ~ 2 <br />f ~ <br />~_~ <br />TABLE 1 <br />MATERIAL DENSITY AND STRENGTH PROPERTIES <br />MATERIAL TYPE WET DENSITY SATURATED COHESION INTERNAL <br /> (pcn DENSITY (psn FRICTION <br /> (pcQ ANGLE <br /> de ) <br />Sandv Clav 120 130 485 14.2 <br />Sliehtly Sand Cla 120 110 760 3.8 <br />For Haul Road D, it cvas assumed that the till would be composed of sandt~ cla}' materials. The cut <br />slope was evaluated as a shghdv sand}' clan. The sod properties and strength data shown on Table l <br />were used in the anaksis. <br />The anahsts was conducted assurmng thece were no springs or seeps in the area. If springs or seeps <br />are encountered during construction a new analyses my be required. <br />The parameters described above were input into the XSTABL program to evaluate stability and static <br />safety factors for the Haul Road D cut and fill slopes. The accompanying XSTABL printouts document <br />input parameters and analysis calculations and results. <br />2.0 RESULTS <br />Using the described inputs, the stabthn' analyses indicates a static FOS of 2.1 and 2.6 for the cut and <br />fill slopes respectively. The XSTABL computer printouts located in Appendix ,~, document all <br />• inputs and stabiGn' analrsis results. <br />3.0 RECOMMENDATIONS <br />In order to achieve the design paramerers, it is recommended that the steep portions oC the haul road <br />be constructed according to the recommendations Cound in Attachment 13-5, Geotectnical <br />Investieauon, Haul Roads Y-A and Y-B and sedimentation Pond 010, Yoast Mine. <br />4.0 REFERENCES <br /> <br />Leidich, Tom (1998). Proposed Haul Roads C and D. Echibit 1?-/1.4, Seneca //W1 Permit. Prepared for <br />Seneca Coal Company. <br />Northwest Colorado Cusultants (1994 ). Geotectnical Investigation, Haulroads Y-A and Y-B and <br />sedimentation Pond 010, Yoast Mine. Attachment 13-5, Yoast Mine Permit , <br />11omlgomrp~ IYa1;on ,--1menre;, (er. lGi Soufh Unron Bouhmrd, Smlr-170 * lykemood, Colorado 80??8 • (303) -63 i 1J0 <br />/: \5 i 1 \m/nvr\Houlrrwd D i ~~~hi/i~~ <br />lbv/7i/97 ch <br />