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<br />WMU FINAL WMU FU-23 DESIGN REPORT 2-18-23 3-3 <br /> <br />TABLE 3-1 <br />Material Properties Used for Stability Analysis <br />Forward Landfill <br />Stockton, California <br />Material/Shear Surface <br />Friction <br />Angle <br />(degrees) <br />Apparent <br />Cohesion <br />or Shear <br />Stress <br />(psf) <br />Unit <br />Weight <br />(pcf) <br />WMU FU-23 Base Liner <br />Clay liner/textured geomembrane interface (Normal Stress 0 to 6,500 psf) 18 0 120 <br />Clay liner/textured geomembrane interface (Normal Stress 6,500 to 17,000 psf) 10 1,000 120 <br />Textured geomembrane/cushion geotextile (Normal Stress 2,000 psf) - 700 120 <br />Textured geomembrane/cushion geotextile (Normal Stress 4,000 psf) - 1,110 120 <br />Textured geomembrane/cushion geotextile (Normal Stress 8,000 psf) - 1,950 120 <br />Textured geomembrane/cushion geotextile (Normal Stress 12,000 psf) - 2,780 120 <br />Textured geomembrane/cushion geotextile (Normal Stress 16,000 psf) - 3,550 120 <br />Side Slope Liner <br />GCL/Geomembrane/GDN (Normal Stress 0 to 17,000 psf) 7 0 120 <br />Waste Materials <br />Wastea (Normal Stress 0 to 770 psf) 0 500 75 <br />Wastea (Normal Stress 770 to 17,000 psf) 33 0 75 <br />Notes: <br />a Waste properties based on literature values (Kavazanjian, 1999). <br />bBased on previous soil investigations (CH2M HILL, 1994e), the foundation materials are relatively strong. Critical shear surfaces therefore <br />occur within the lining system and refuse and do not extend through the foundation <br /> <br /> <br />3.2.2 Results of Slope Stability Analyses <br /> <br />As shown on the Construction Drawings (Appendix A), WMU FU-23 is located east of WMUs 17 <br />and 19. The southern slope of WMU FU-23 is a permanent slope but will not achieve final grades <br />until future modules to the east and north are constructed and is, therefore, not a critical slope for <br />WMU FU-23 slope stability analysis. The Joint Technical Document (JTD; Lewis Engineering 2020) <br />provides site development plans that depict the development of future modules to the east and north <br />of WMU FU-23. <br /> <br />EASTERN SLOPE <br />A slope stability analysis was performed for an east-west cross section through the eastern interim <br />refuse fill slope. The eastern slope grades to a maximum 110-ft fill elevation with a 3:1 slope and 20- <br />ft wide roads or benches every 50 vertical feet.