2004-02-24_REVISION - M1977153 - Laserfiche WebLink

Home Browse Search

Hazeltine/Road Runners Rest II/Brinkmann-Woodward Gravel Pits Lining Project -Design Technical Memorandum Denver Water August 2003 foot-wide vertical zone of soft material located within the cross section. A surcharge loading of 200 pounds per square foot (psf) was used to model construction loading. The idealized representative cross sections are shown on Figures 3.3 and 3.4. TABLE 3.1 REPRESENTATIVE CROSS SECTIONS AND APPLICABLE STATIONING Representative Cross Section A proximate Startin and Endin Stations 35-foot-hi h Section 0+00 to 86+00 55-foot-hi h Section 86+00 to 130+00 35-foot-hi hSection 130+00 to 148+00 3.4 Material Properties for Stability Analyses Material properties, such as moist and saturated unit weights and shear strengths for different soil types were estimated based on: 1) results from laboratory tests (GEI, 2000), 2) published empirical correlations between material type and SPT blowcounts and soil shear strength, and 3) our experience in geotechnical engineering. Material properties used in the slope stability analyses are summarized in Table 3.2. The material properties are similar to those used in GEI's previous slope stability evaluation for the western portion of the reservoir (GEI, 2001 a). TABLE 3.2 SUMMARY OF MATERIAL PROPERTIES FOR SLOPE STABILITY ANALYSIS Drained Stren th Material Moist Unit Weight (pct) Saturated Unit Weight (pcf) Cohesion s Friction Angle de rees Overburden 120 125 0 30 Sand and Gravel 123 125 0 35 Soil-Bentonite Cutoff wall 115 120 0 15 Stabilization Fill 123 125 0 28 Bedrock 130 135 1000 30 3.5 Water Pressures Water pressures were estimated for two steady state seepage conditions as follows: • Full reservoir: o Reservoir at normal pool. o Water level in the South Platte River at El. 5013. o Water surface outside of the pit in areas not along the South Platte River at 8 feet below existing ground surface. GE[ Consultants, ]nc. 10 030HU U?-01-?I id-Hazehine Dalgn i\1