215 DORN AVE Geotech Report 2022-10-25

NELSON GEOTECHNICAL N ,. A. ASSOCIATES, INC. GEQTECHNICAL ENGINEERS&GEOLOGISTS Main Office Engineering-Geology Branch 1 731 1-135u'Ave NE,A-500 5526 industry Lane,02 Woodinville,WA 98072 East Wenatchee,WA 98802 (425)486-1669•FAX(425)481-2510 (509)665-7696•FAX(509)665-7692 April 19,2018 Eduardo Avendano EFI Properties,LLC 205 East Casino Road Suite 12 Everett,WA 98208 Geotechnical Engineering Evaluation Multi-Family Residential Development 215 Dorn Avenue Everett,Washington NGA File No. 1031018 Dear Mr.Avendano: We are pleased to submit the attached report titled "Geotechnical Engineering Evaluation — Multi- Family Residential Development—215 Dorn Avenue—Everett,Washington." This report summarizes our observations of the existing surface and subsurface conditions within the site, and provides general recommendations for the proposed site development. Our services were completed in general accordance with the proposal signed by you on March 9,2018. We visited the site on March 23,2018 to observe the current site conditions and complete explorations of the subsurface conditions. The proposed development area consists of a rectangular parcel covering approximately 0.3 acres, located at the above address. The proposed development areas of the site are relatively level to gently sloping. The site is currently vacant, except for a detached shed structure along the southeastern property line. We understand that the proposed development plan will include construction of two new multi-family residential structures as well as associated utilities and pavement areas throughout the property. We were provided with preliminary grading and stormwater handling plans at the time this report was prepared. We understand that stormwater generated within the property may be directed to onsite infiltrations systems,if feasible. We monitored the excavation of three test pit explorations and two infiltration test pits within the site on March 23,2018. Our explorations indicated that the site was underlain by competent,native glacial soils at shallow depths,below a surficial layer of topsoil and/or undocumented fill. We have concluded that the site is generally compatible with the planned development. We have recommended that the new structures be founded on the medium dense or better native glacial soil for bearing capacity and settlement considerations. These soils should generally be encountered approximately one to three feet below the existing ground surface,based on our explorations. 81