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December 21, 2022 <br /> Job No. 4031.101 <br /> Page 8 <br /> <br />BERLOGAR STEVENS & ASSOCIATES <br /> <br /> POST-TENSIONED SLAB FOUNDATIONS <br /> <br />Post-tensioned (PT) slab foundation design criteria should be developed after grading. Selective <br />Sampling, Atterberg Limits and sieve analysis testing will need to be performed to develop the <br />criteria. In our experience with area, we estimate the PT slab foundations will be approximately <br />11 inches thick. The following is preliminary PT Slab Design Criteria: <br /> <br />PT Slab Design Criteria <br />Allowable Bearing Capacity (may be increased <br />by 1/3 for seismic and wind loads at the <br />discretion of the structural engineer) <br />1,200 psf <br />Passive Equivalent Fluid Pressure <br />(neglect the upper 2 feet) <br />250 pcf <br />Base Friction Coefficient 0.25 <br />Edge Moisture Variation Distance <br /> Center Lift <br /> Edge Lift <br /> <br />9.0 feet <br />4.9 feet <br />Differential Swell <br /> Center Lift <br /> Edge Lift <br /> <br />0.55 inches <br />1.00 inches <br /> <br /> SEISMIC DESIGN PARAMETERS <br /> <br />We are providing the following 2019 California Building Code seismic design criteria for the site <br />using the SEAOC/OSHPD Seismic Design Maps Tool: <br /> <br />2019 California Building Code <br />Latitude (Degrees North) 37.6682 <br />Longitude (Degrees West) -121.9138 <br />Risk Category I/II/III <br />Peak Ground Acceleration (PGAM) 0.91 <br />Mapped Spectral Acceleration for Short Periods, Ss 1.992 <br />Mapped Spectral Acceleration for 1-Second Period, S1 0.733 <br />Site Class D <br />Site Coefficient Fa (for Site Class D) 1.0 <br />Site Coefficient Fv (for Site Class D) null* <br />Acceleration Parameter SMS (adjusted for Site Class C) 1.899 <br />Acceleration Parameter, SM1 (adjusted for Site Class C) 0.84 <br />Acceleration Parameter, SDS (adjusted for Site Class C) 1.266 <br />Acceleration Parameter, SD1 (adjusted for Site Class C) 0.56 <br />Seismic Design Category D