Laserfiche WebLink
i <br /> Subsurface Explorauan, Geologic Hazard, and <br /> P�eliminary Geo�ech'u�°�E"g°1Qering Repon <br /> Sno-Isle Sktlk Cente�Addition (',¢ologic Namrds an�%Mitigations <br /> Everen, Washingron <br /> 6.2 SeismicallY Induced Landslides <br /> There were no significant slopes on the site. Therefore, shallow anu deep-seated, seismically <br /> induced landsliding �s unl�kely, and no mitigation efforts are recommended. <br /> 6 3 Li`��1OII <br /> The encountered stratigraphy has a low potential for liquefaction due to the high strength of�e <br /> glacially consolidated near-surface lodgemcnt till soils, and the lack of widespread ground <br /> water. No liquefaction mitigation efforts aze recommended. <br /> 6.4 Gro�p° <br /> Structural design of the buildings should follow 2006 IBC standazds using Site Class "C", as <br /> defined in Table 1613.5.2• The 2006 IBC seismic design p��eters for short period (Ss) and <br /> 1-second period (Si) spectral acceleration values were determined by �e 1��pio ect�webste <br /> of the project site using the USGS National Seismic Hazard Mapp g .l <br /> (bttp //earthQualce usgs vov/hazmaPs�). 'I'he USG e ods lof 0.2 andale0 secondsm espetiveye <br /> project site to be 1.256g and 0.44g for building p <br /> with a 2 percent chance of exceedence in 50 years• Using the mapped spectral acceleration in <br /> conjunction with the identified site cIass, informauon Presented in Tables 1613.53(1) and <br /> 1613.53(2) indicates site coefficients Fa = 1.0 and F� = 1.356 ue recommended for use in <br /> site seismic design and analysis. � <br /> 7.0 E_ R�r�AZARDS AND MITIGATION <br /> As of October 1, 2006, the WasUington State Depariment of Ecology (Ecology) Construction <br /> Storm Water Genera] Pemut (also ���'n Temeor�azy EroPon'uandt Dedim ntation�Conirol <br /> System [NPDFS� permit) requires weeklY P <br /> (TESC) inspections for all sites 1 or more acres in size that dischuge storm water to surface <br /> waters of the state. The TESC inspections must be completed by a Certified Erosion and <br /> Sediment Control Lead (CFSCL) for the durationeodf�o��p��n�st�Wa�o p aution <br /> need to be sent to Ecology, but shouid be logg <br /> Prevention Plan (SWPFP). If the proeec�t d�oldert f[here s uof acilitY on�e re�O°gy also <br /> be kept in a fde on-site, or by the P <br /> requires weeklY turbidity monitoring by a CESCL of storm water leaving a site for all sites <br /> 5 acres or greater. Ecology requires a monthly summary report of the turbidity monito ag <br /> results (if performed) sig�ed bY �e NPDES pemut holder. I�C�azk s°��d) �� P 1e� <br /> or exceeds 25 nephelomeuic turbidity units (NTin (E�°logy <br /> �iest management practices (BMPs) should be modified to decrease t6e turbidity of storm water <br /> leaving the site. Changes and upgrades to the BMPs should be contiaued until che weekly <br /> nssocurEn�rK sct�cPage 6 <br /> Iune 11, 2008 <br /> FGild-fECQ02i3A5-Piajeas120PB03131EE�WP <br />