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~u~ 1997 Snrem Canl ComDmg~ * Yoatt dlrne Sedt'mrnmkon Pond 013 S!oln'!il~~ Ano/ltit •1 <br /> <br />r1 <br />LJ <br />r 1 <br />TABLE 1 <br />SEDBI1ENTATION POND 013 SOIL DATA <br />SOIL No. SOIL NAb1E ATTERBERG PARTICLE SIZE USCS <br /> LIMTTS DATA CLASSff'ICATION <br /> (LL-PD (%n assin No. 200) <br />I 1 C Binco 35 w 60 - 15 to 35 72 - 92%n CL-CH <br />35E Aaber No data 60-9~% CL <br />In order to estimate the engineering properties of the available soil, field data collected for Sedimentation <br />Pond 010, and haul roads Y-A and Y-B were reviewed (Northwest Colorado Consultants, 1994 and 1996). <br />The data were compared to the NCRS index data (NCRS, 1999) available for the area of Pond 013 <br />according to the Yoast Mine soil survey (Nyenhuis, 1993-a). The soil data collected for Pond O10 compares <br />well to the soil available in the Pond 013 area. The following [able summarizes the index properties of [he <br />materials tested for strength parameters. <br />TABLE 2 <br />SEDIINENTATION POND 010 LABORATORY VERIFIED DATA <br />MATERL4L TYPE ATfERBERG LIh1FiS <br />(LL-Pq PARTICLE SIZE DATA <br />(%n Passin No. 200) USCS <br />CLASSIFICATION <br />Sand Cla 38 - 32 86 CL <br />Sli htly Sand Clav 52 - 31 96 CH <br />For Pond 013, it was assumed [hat [he embankment material would be consvucted out of a sandy clay <br />material similar to the upper stratum of the Binco Series described in Table I. The subgrade was evaluated <br />as a slightly silty and sandy clay, common to deeper stratums of the Binco and Aarbero Series. The <br />following soil properties and strength data were used in the analysis: <br />TABLE3 <br />MATERIAL DENSITY AND STRENGTH PROPERTIES <br />MATERIAL TYPE WET DENSITY SATURATED COHESION INTERNAL <br /> (pcQ DENSITY (ps0 FRICTION <br /> (pcf) ANGLE <br /> (de <br />Sandv Cla 120 130 485 14.2 <br />Sli htl Sandv Clav 120 13(7 760 3.8 <br />The parameters described above were input into the YSTABL program to evaluate static stability of the <br />Pond 013 structure and are shown in the attached program printouts with associated results. <br />Afoetgome~~ Ib~udan Americo, Inr. 1G) South Union Boulevard, Suilr 410 * I~keavod, Co/orado 80118 * (303) i6J-5140 <br />f'\8i l \re{art\jnnd! Atdln'Gry <br />0%/!G/99 nh <br />