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June 13,2023 <br />HWA Project No. 2022-188-21 <br />Tabte 1: Ground Motion Values, Site Class C* <br />Period <br />(sec) <br />Mapped MCE <br />Spectral <br />Response <br />Acceleration <br />(e) <br />Site <br />Coefficients <br />Adjusted MCE <br />Spectral <br />Response <br />Acceleration (g) <br />Design Spectral <br />Response <br />Acceleration (g) <br />0.0 PGA 0.225 Fpct 1.200 PGArra 0.270 <br />0.2 S"0.stz Fo 1.295 .lu"0.663 ,Sp"0.442 <br />1.0 Sr 0.208 F,1.s00 Svt 0.312 Sol 0.208 <br />Notes *20% Probability ofExceedance in 50 yearsfor Latitude 47.0151" and Longihde -120.5912" <br />PGA : Peakground acceleration <br />Fpce, : PGA site coeffrcient <br />PGAv : Maximum considered earthquake geometric mean peak ground acceleration adjusted for Site Class effects <br />S5 : Short period (0.2 second) Mapped Spectral Acceleration <br />Sr : 1.0 second period Mapped Spectral Acceleration <br />Svs = Spectral Response adjusted for site class effects for short period: Fu ' Ss <br />Srr,rr = Spectral Response adjusted for site class effects for 1-secondperiod = Fu'Sr <br />Sos = Design Spectral Response Acceleratiou for short period:2/3 ' Sr',rs <br />Sor = Design Spectral Response Acceleration for l-second period =2/3 ' Srr,rr <br />F": Short Period Site Coeffrcients <br />Fu: Long Period Site Coefficients <br />To = 0.2'SDl/SDs <br />T.: SDI/SDs <br />TL = Long Period Transition period <br />Based on Tables 11.6-1 and 11.6-2 (of ASCET-16), the Seismic Design Category for the site is <br />,.Drr. <br />4.3 LrqumLcrloNPorENTIAL <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 Foumra,rroxs <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 />9 <br />Transition <br />Point <br />Period <br />(sec) <br />To 0.094 <br />Ts 0.470 <br />Tr t6 <br />2022-188-21 KCTS - Final Geotechnical Report HWAGEOSCIENCES INC.