3214 BROADWAY Geotech Report 2022-10-25

American Property Development ES-0599.06 June 9, 2016 Page 4 Revised October 16, 2017 Geologically Hazardous Areas and Environmental Sensitive Features Review As part of our report preparation, we reviewed available maps and resources to identify designated geological hazardous areas for the site. Specifically, we reviewed the city of Everett's municipal code regarding Environmental Sensitive Features (37.40) and Geological Hazardous Areas (37.080). Everett's municipal code designates slopes of 40 percent or greater, landslide hazard areas, seismic hazard areas and erosion hazard areas to be geological hazardous areas. Wetlands, flood plains and known erosion sensitive areas are listed as sensitive environmental features. A review of the Everett Department of Public Works and Planning (DPWP) records did not uncover any documentation indicating the subject property (or adjacent properties) possess geological hazardous areas or sensitive environmental features. Nor did interviews with departmental personnel reveal any oral record or known history of geologically hazardous activities or environmental sensitive features in the subject property's vicinity. Furthermore, ESNW has researched the subject's property's history back to 1894 and did not uncover any incidents indicating a geological hazard impacting the subject property. Based on our review of the available resources, the subject site is not located within any DPWP designated geologically hazardous areas or environmentally sensitive features. DISCUSSION AND RECOMMENDATIONS General Based on the results of our study, construction of the proposed apartment complex at the subject site is feasible from a geotechnical standpoint. The primary geotechnical considerations associated with the proposed development include temporary slope excavations, excavation support, and foundation support. Based on the results of our study, the proposed building structure can be supported on conventional spread and continuous footings bearing on competent, undisturbed native soil. Based on the proposed excavation, we anticipate competent native soils suitable for support of foundations will be exposed at the foundation subgrade elevation. Where loose or unsuitable soils are exposed at the foundation subgrade elevation, the soils should be overexcavated and replaced with a suitable crushed rock material in foundation areas. Where sufficient space is available, a portion of the lower level excavation may be completed using temporary open cut excavations. Temporary shoring or a combination of shoring and temporary slopes will be necessary where the building will be sited in close proximity to the property limits. In our opinion, where shoring is necessary, the use of a conventional cantilever or tieback shoring system is feasible for temporary support of excavations. In our opinion, soil nailing is also a feasible alternative for excavation shoring. For purposes of this study, recommendations for conventional shoring and soil nailing are provided. Earth Solutions NW,LLC