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June 13, 2023 <br />HWA Project No. 2022-188-21 <br />Table 1: Ground Motion Values, Site Class C* <br />Mapped MCE <br />Adjusted MICE <br />Period <br />Spectral <br />Site <br />Spectral <br />Design Spectral <br />(sec) <br />Response <br />Coefficients <br />Response <br />Response <br />Acceleration <br />Acceleration (g) <br />Acceleration (g) <br />0.0 <br />PGA <br />0.225 <br />FPGA <br />1.200 <br />PGAM <br />0.270 <br />- <br />- <br />0.2 <br />S, <br />0.512 <br />Fa <br />1.295 <br />sm, <br />0.663 <br />SDI <br />0.442 <br />1.0 <br />Sr <br />0.208 <br />F, <br />1.500 <br />SMI <br />0.312 <br />Sw <br />0.208 <br />Transition <br />Point <br />Period <br />(sec) <br />To <br />0.094 <br />Ts <br />0.470 <br />IL—TL <br />16 <br />Notes. *2% Probability of Exceedance in 50 years for Latitude 47.0151 ° and Longitude-120.5912° <br />PGA = Peak ground acceleration <br />FPGA = PGA site coefficient <br />PGAM = Maximum considered earthquake geometric mean peak ground acceleration adjusted for Site Class effects <br />Ss = Short period (0.2 second) Mapped Spectral Acceleration <br />Si = 1.0 second period Mapped Spectral Acceleration <br />SMs = Spectral Response adjusted for site class effects for short period = Fa • Ss <br />SM) = Spectral Response adjusted for site class effects for I -second period = F • S) <br />SIDS = Design Spectral Response Acceleration for short period =2/3 • SMs <br />SDI = Design Spectral Response Acceleration for 1-second period =2/3 • SMi <br />F,1 = Short Period Site Coefficients <br />F = Long Period Site Coefficients <br />To= 0.2•SDI/SDs <br />T, = SDI/SDs <br />TIL = Long Period Transition period <br />Based on Tables 11.6-1 and 11.6-2 (of ASCE 7-16), the Seismic Design Category for the site is <br />«D„ <br />4.3 LIQUEFACTION POTENTIAL <br />The native fine-grained and coarse -grained alluvial deposits that underlie the project site are <br />either moderately to highly plastic or dense to very dense and are not generally susceptible to soil <br />liquefaction. Based on this HWA considered the site soil to have a low susceptibility to soil <br />liquefaction. <br />4.4 FOUNDATIONS <br />We recommend that foundations for the transfer station, the MRW building, the administration <br />building, and the scale facility be supported on spread footings founded on the underlying <br />medium dense to dense, coarse -grained alluvium, or properly compacted structural fill placed <br />directly on native coarse -grained soils. The following sections provide our recommendations for <br />design and construction of the foundations. <br />2022-188-21 KCTS — Final Geotechnical Report 9 HWA GEOSCIENCES INC. <br />