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1Im' 1777 Snre, o Co.J t.04/~Jll1' ` 1 a¢d 1 Lnt Srdinren;a/iou Pond O1? Sh,Gdi9 .-trio/cnt •'_ <br />• <br />• <br />TABLET <br />SEDIMENTATION POND 012 SOILS DATA <br />SOIL No. SOIL NASIE ATTERBERG PARTICLE SIZE USCS <br /> LIMITS DATA CLASSIFICATION <br /> (LL - Pq l% assin No. 200) <br />6B Zohav Varian 3U to 35 - 10 to 20 58 - 76%n CL <br />IIC.IID Binco 35 to 60-IS 1o 35 7'---9?%n CL-CH <br />103 Ustorthents- No data 76%r CL <br /> Crvoborolls Com lex <br />Tn order to estimate engineering properties of foundation materials and the materials w be used in <br />constructing the Sedimentation Pond O1? embankment, field data collected for Sedimentation Pond 010, <br />and haul roads Y-A and Y-B were reviewed (Northwest Colorado Consultants, 1994 and 1996). This data <br />was compared to NRCS index data (NRCS. 1999) for [he mapped soils type in the area of Pond 012 <br />(Nvenhuis, 1993-aj. The soils data collected for Pond 010 compares well with NRCS index data for <br />available soil and subsoil materials in the Pond 012 area. The following table summarizes the index <br />properties of the materials from the Pond O10 area tested fer strength parameters. <br />TABLE 2 <br />SEDIMENTATION POND 010 LABORATORY VERIFIED DATA <br />MATERIAL TYPE ATTERBERG LIMITS <br />(LL - PI} PARTICLE SIZE DATA <br />(% Passin No. 200) USCS <br />CLASSIFICATION <br />Sandv Cla 38 - 22 86 CL <br />Sliahtl Sand Cla ~? - 31 96 CH <br />for Pond 012, it was assumed that the pond embankment would be constructed of sandy clay materials <br />similar to the Zoltay Variant and upper stratum of the Binco Series as characterized by Table I. The <br />foundation subgrade was evaluated as a slightly sandy clay, common to deeper stratums of the Binco <br />Series. The following soil properties and strength data were used in the analysis: <br />TABLE 3 <br />MATERIAL DENSITY AND STRENGTH PROPERTIES <br />MATERIAL TYPE WET DENSITY SATURATED COHESION INTERNAL <br /> (pcp DENSITY (psQ FRICTION <br /> (pcq ANGLE <br /> (de ) <br />Sand Cla I?0 130 385 131 <br />Sliehtl Sandv Cla RO 130 760 3.8 <br />The parameters described above were input into the XS'CABL program to evaluate stability and static <br />safety factor for the Pond 012 structure. The accompanying XSTABL printouts document input parameters <br />and analysis calculations and results. <br />2.0 RESULTS <br />• <br />Using the analysis inputs described in the previous section, the following stability analysis results were <br />obtained: <br />Jlam7gomrry IF~ntrar .9mrn<nt Irrc. IGS Sou(b Unro~r Bou/trorA, Sui7r J70 * L~keu~oarl, Co%rmlo 80??8 * /103J iG3-i 1-1 t7 <br />f:\.Yi 1 \re(wrl\Fondli nuGiG9' <br />qi/Ii/7%rJ~ <br />