1210 W MARINE VIEW DR Geotech Report 2022-10-25

Proposed Port Gardner Substation (� Project No. 1779.01 . , V 0 15 November 2017 Geoprofessional Consultants Geologic Hazard Environmentally Critical Areas Chapter 37.080 of the Everett Municipal Code (EMC) describes geologically hazardous areas including seismic/liquefaction, landslide, and erosion hazard areas. A summary of geologic hazard critical areas is presented below. Seismic/Liquefaction Hazard: EMC 19.37.080.A.2 defines a seismic hazard area as the following: • Those areas mapped as seismic/liquefaction hazards per the Dames and Moore Methodology for the Inventory,Classification and Designation of Geologically Hazardous Areas,City of Everett, Washington:July 1, 1991. • Those areas mapped as high and moderate to high liquefaction susceptibility on the Liquefaction Susceptibility Map of Snohomish County,Washington,Washington State Department of Natural Resources, Palmer,Stephen,et al.,September 2004. The project site is included within designated seismic/liquefaction hazard areas on the two maps referenced above. This is due to the presence of relatively low-density fill material and shallow groundwater present along the Everett waterfront. The seismic performance of the site was evaluated relative to seismic hazards resulting from ground shaking associated with the Maximum Considered Earthquake Geometric Mean (MCEG) Peak Ground Acceleration and the Risk-Targeted Maximum Considered Earthquake (MCER) Ground Motion Response Acceleration in accordance with the 2015 International Building Code (IBC). Conformance to the above criteria for seismic excitation does not constitute any kind of guarantee or assurance that significant structural damage or ground failure will not occur if a maximum considered earthquake occurs. The primary goal of the IBC seismic design procedure is to protect life and not to avoid all damage,since such design may be economically prohibitive. Following a major earthquake, a structure may be damaged beyond repair,yet not collapse. Ground Surface Rupture We evaluated the potential for seismic ground surface rupture at the site by reviewing the USGS Quaternary Fault Web Mapping Application.The mapping application indicates that there are no mapped Quaternary faults within 5 miles of the site. It is our opinion that the risk of ground surface rupture at the site is low. La ndsliding Based on the relatively level topography of the site and surrounding vicinity, the risk of earthquake- induced landsliding is low. PageJ4