Laserfiche WebLink
Subject: <br />Job No.: 149259 Made by: P.Thomas Date: 1/19/2015 <br />Ref:Foothill LF Checked: L.Yamamoto Reviewed: L.Yamamoto <br />OBJECTIVE: <br />APPROACH: <br />REFERENCES:1. <br />2. <br />3. <br />4. <br />5. <br />GIVEN: <br />User Input Calculated <br />CALCULATIONS:Using the Bray procedure (Ref. No. 1): <br />1. <br />From Fig. 2: <br />62 <br />0.20 g <br />0.61 s <br />21.80 s <br />Seismic Slope Displacement for the MPE Event <br />Estimate the possible deformation of the Foothill Landfill final landform caused by the near-field MPE. <br />MHA rock = <br />T m = <br />D5-95 = <br />"Simplified Seismic Design Procedure for Lined Solid-Waste Landfills," by J. D. Bray, E. M. Rathje, A. J. Augello and S. M. Merry, 1998, <br />Geosynthetics International, Vol. 5, Nos. 1 - 2. <br />Using the Bray et al. (1998) method for estimating seismic displacements, quanitfy possible deformation caused by the MPE seismic event. <br />Given the MPE inputs below, use Fig 2(b) to estimate the mean period of <br />acceleration-time history, Tm, and Fig. 2(c) to estimate significant duration of <br />shaking-time history, D5-95. <br />Foothill Landfill yield acceleration (Ky = 0.1399g) determined by SLIDE (v.6.032) slope stability computer program (see attached). <br />The MPE ground motion at the landfill was based on the 2014 USGS National Seismic Hazard Map of the United States — specifically, the PHGA <br />of 0.200g was determined from the referenced seismic hazard map, as provided in attached pages (Note: PHGA = Peak Horizontal Ground <br />Acceleration (MHA) for rock.) <br />The average global waste fill height, based on the stability section, is approximately 180 feet. According to Kavazanjian et al. (1995), Figure 3 <br />below, the shear wave velocity for an approximately 55 m (180 ft) fill is estimated to be 385 m/s. <br />The yield acceleration, Ky = 0.1399g, for the global slope was iterativley solved for using the SLIDE slope stability software. <br />Distance to nearest fault (62 km ) obtained from Appendix A of the 2012 Updated Slope Stability Analysis for Foothill Sanitary Landfill. <br />Event Distance <br />(km) <br />Peak Horizontal Ground Acceleration (PHGA) of 0.200g was obtained from the 2014 USGS National Seismic Hazard Map of the U.S. <br />"Evaluation of MSW Properties for Seismic Analysis," by E. Kavazanjian, N. Matasovic, R. Bonaparte, G. Schmertmann, 1995. <br />NotUsed:PGA <br />obtainedfromUSGS <br />2014NationalSeismic <br />HazardMap. <br />62 m <br />385 m/s <br />62 km <br />21.8 <br />0.61 <br />1 of 3