406 PECKS DR Geotech Report 2025-07-14

December 30th, 2021 G-5593 4730—Seahurst Ave,Washington 98203 Page 3 was met in the fill material at approximately 1.7 feet in HA-1. Soils encountered are characteristic of glacial till profiles which typically consist of weathered, medium dense to dense silty sand with subrounded gravel underlain with very dense material of the same composition. Our findings are consistent with the local geologic mapping in our opinion. Groundwater was not encountered in the borings during our investigation. For information about the soils encountered, please refer to the boring log in Appendix A. GEOLOGICALLY HAZARDOUS AREAS EVALUATION Landslide Hazard-Medium We understand that the City of Everett has designated the western margin of the project site as a medium landslide hazard. The designation also includes the immediate west-adjacent property to the site. The area is illustrated on the Site Geologic Hazards Map, attached as Plate 4 to this report. Per Everett Municipal Code (EMC) 19.37.080,these areas are described slopes between twenty-five (25)percent and forty(40)percent in Qvt(Glacial Till) geologic units. Per the mapping available via the Everett Property Tool GIS,the medium landslide hazard area exists at the western margin of the project site and is a minimum of approximately 35 feet from the proposed garage addition footprint. The proposed garage is approximately 63 feet away from the slope crest. Based on our observations and the available topographic GIS mapping,the hazard area slopes down approximately 10 feet in vertical height westwardly at moderate inclinations until reaching a levelled terrace at the west property line. West of the property line,the topography continues to slope westward at moderate to steep inclinations. During our investigation,we probed the steep slope areas at the site and encountered dense soils at depths of 3 to 4 feet beneath the ground surface. We interpret the slopes as underlain with native glacial till,which we encountered at similar depths in the borings of our investigation. We observed the slopes at the site to be vegetated with native trees, shrubs, and various other forms of groundcover. We find the existing vegetation and the dense to very dense soil conditions present at the site to be mitigating factors regarding slope stability and potential landsliding of the hazard areas at the site. In our opinion,the mapped landslide hazard area is stable at this time and the risk of adverse effect to the areas due to the proposed development is negligible. Our opinion is that the buffer from building footprints to the steep slope hazard areas on the site can be reduced to a minimum of 25 feet. When including the 10-foot building setback,the total minimum distance from building GEO Group Northwest,Inc.