3322 KROMER AVE Geotech Report 2023-05-25

� GeoTest Services, Inc.—Revision 1 April 10,2020 Kikuchi Retaining Wall, Everett,Washington Project No.20-0344 PURPOSE AND SCOPE OF SERVICES The purpose of this evaluation is to establish general subsurface conditions beneath the site from which conclusions and recommendations pertaining to the project design can be formulated.Our scope of services includes the following tasks: • Explore soil and groundwater conditions underlying the site by advancing three exploration test pits and four Dynamic Cone Penetrometer(DCP)tests. • Perform laboratory testing on representative samples to classify and evaluate the engineering characteristics of the soils encountered. • Provide a written report containing a description of subsurface conditions and exploration logs. The findings and recommendations in this report pertain to the geotechnical parameters in order to assist the structural engineer in the design of a cast-in-place retaining wall. • Assess Geologically Hazardous Areas (if present) per Everett Municipal Code. PROJECT DESCRIPTION The subject property (Parcel No. 00583978301402) consists of four lots located within an established residential neighborhood in the City of Everett.An existing single-family residence is located on the upper, southern half the of the subject property and the lower, northern half of the subject property is currently undeveloped. A moderately steep, northern-to northwestern- facing slope, with approximately 20 to 25 vertical feet of elevation differential separates the upper half of the property from the lower half. During an initial site visit, GeoTest was shown two locations on the lower portion of the site where retaining walls will likely be needed.The first location would be an east-west trending wall at the toe of the slope. Currently, a three- to five-foot tall bulkhead consisting of timber "dead man" anchors extends into the slope. The bulkhead appears to be decaying and in need of replacement. The second location will require a north-south running wall along the western boundary of the subject property. At present, about six to ten feet of vertical separation exists between the subject property and the adjacent neighboring residential property. GeoTest anticipates that a retaining wall, six to nine vertical feet in height will be needed at the second location. Our current scope of services excludes infiltration feasibility. Our services are restricted to considerations for new retaining wall/s and a review of municipal code with respect to construction adjacent to an existing steep slope. 1