4812 HARBOR LN 2018-01-02 MF Import

Geotechnical Engineering Study Mahan Residence 4800 Block of Harbor Lane Everett, Washington 1.0 PROJECT DESCRIPTION The proposed Mahan Residence is planned to be 7 )rated in an existing single-family residential subdivision in the 48M block of Harbor Lane in Everett, Washington. We understand that the proposed residence will be a three-story, wood -framed structure stepped into the existing natural grade. The lot configuration and building location is shown on the attached Fxploration Location Plan, Figure 2. This plan is based on a drawing prepared by Mead Gilman and Associates, dated October 24, 1998. Driveway access to the site will be from the west side of Harbor Lane. Finish building elevations were not available at the time of our study. However, we understand the structure will be stepped into the native grade with lower foundation walls approaching heights of 12 feet. Also, based on our previous experience with similar structures, we expect that perimeter load -bearing walls will cant' between 2 and 4 kips per lineal foot and that isolated spread footings may carry loads of up to 50 kips. The steep, west -facing slope outside of the building site will be reserved as open space. T'he recommendations contained in the following sections of this report are based on preliminary site development inform-ttion. We should review final design drawings and specifications to verify that our recommendations have been properly interpreted and incorporated into project design. 2.0 SCOPE OF WORK On November 13, 1998, we drilled 2 test borings to depths of 14.0 and 10.5 feet below existing surface grades and made a reconnaissance of the immediate area. Using the information obtained from the subsurface exploration and site reconnaissance, we performed analyses to develop preliminary geotechnical recommendations for project design and construction. Specifically, this report addresses the following: • Soil and groundwater conditions • Site preparation and grading • Geologic hazards • Foundation design • Lateral earth pressures • Surface and subsurface drainage • Pavements