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ZUSGS Design Maps Detailed Report <br /> ASCE 41-13 Retrofit Standard, Custom, 2% in 50 year values (38.65891N, 104.895°W) <br /> Class E - "Soft Clay Soil" <br /> Section 2.4.1 - General Procedure for Hazard Due to Ground Shaking <br /> From Section 2.4.1.5 Ss,curtor, = 0.209 g <br /> From Section 2.4.1.5 Sl,custom = 0.071 g <br /> Section 2.4.1.6 - Adjustment for Site Class <br /> The authority having jurisdiction (not the USGS), site-specific geotechnical data, and/or <br /> the default has classified the site as Site Class E, based on the site soil properties in <br /> accordance with Section 2.4.1.6.1. <br /> SITE SOIL PROFILE Soil shear wave Standard penetration Soil undrained shear <br /> CLASS NAME velocity, vs, (ft/s) resistance, N strength, su, (psf) <br /> A Hard rock vs > 5,000 N/A N/A <br /> B Rock 2,500 < vs <- 5,000 N/A N/A <br /> C Very dense soil 1,200 < vs <- 2,500 N > 50 >2,000 psf <br /> and soft rock <br /> D Stiff soil profile 600 -< vs < 1,200 15 <_ N <- 50 1,000 to 2,000 psf <br /> E Stiff soil profile vs < 600 N < 15 <1,000 psf <br /> E — Any profile with more than 10 ft of soil having the characteristics: <br /> 1. Plasticity index PI > 20, <br /> 2. Moisture content w >- 40%, and <br /> 3. Undrained shear strength s. < 500 psf <br /> F — Any profile containing soils having one or more of the following <br /> characteristics: <br /> 1. Soils vulnerable to potential failure or collapse under seismic loading such <br /> as liquefiable soils, quick and highly sensitive clays, collapsible weakly <br /> cemented soils. <br /> 2. Peats and/or highly organic clays (H > 10 feet of peat and/or highly <br /> organic clay where H = thickness of soil) <br /> 3. Very high plasticity clays (H > 25 feet with plasticity index PI > 75) <br /> 4. Very thick soft/medium stiff clays (H > 120 feet) <br /> For SI: 1ft/s = 0.3048 m/s 11b/ft2 = 0.0479 kN/m2 <br />