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HazeltinelRoad Runners Rest II/Brinkmann-Woodward Gravel Pits Lining Project -Design Technical Memorandum <br />Denver Water <br />August 2003 <br />foot-wide vertical zone of sofr material located within the cross section. A surcharge loading <br />of 200 pounds per square foot (psf) was used to model construction loading. The idealized <br />representative cross sections are shown on Figures 3.3 and 3.4. <br />TABLE 3.1 <br />REPRESENTATIVE CROSS SECTIONS AND APPLICABLE STATIONING <br />Re resentative Cross Section A roximate Startin and Endin Stations <br />35-foot-hi h Section 0+00 to 86+00 <br />55-foot-hi h Section 86+00 to 130+00 <br />35-foot-hi hSection 130+00 to 148+00 <br />3.4 Material Properties for Stability Analyses <br />Material properties, such as moist and saturated unit weights and shear strengths for different <br />soil types were estimated based on: 1) results from laboratory tests (GEI, 2000), 2) published <br />empirical correlations between material type and SPT blowcounts and soil shear strength, and <br />3) our experience in geotechnical engineering. Material properties used in the slope stability <br />analyses are summarized in Table 3.2. The material properties are similar to those used in <br />GEI's previous slope stability evaluation for the western portion of the reservoir (GEI, 2001 a). <br />TABLE 3.2 <br />SUMMARY OF MATERIAL PROPERTIES FOR SLOPE STABILITY ANALYSIS <br /> Drained Stren th <br />Material Moist Unit Weight <br />(pct Saturated Unit Weight <br />(pcf7 Cohesion <br />s Friction Angle <br />de rees <br />Overburden 120 125 0 30 <br />Sand and Gravel 123 125 0 35 <br />Soil-eentonite Cutoff wall 115 120 0 15 <br />Stabilization Fill 123 125 0 28 <br />Bedrock 130 135 1000 30 <br />3.5 Water Pressures <br />Water pressures were estimated for two steady state seepage conditions as follows: <br />• Full reservoir: <br />o Reservoir at normal pool. <br />o Water level in the South Platte River at El. 50] 3. <br />o Water surface outside of the pit in areas not along the South Platte River at 8 feet <br />below existing ground surface. <br />GEI Consultants, Inc. 10 0?OYO 03-Oi-)1 IA Haxdiine Dsipn T\t <br />