3610 W MUKILTEO BLVD Geotech Report 2022-10-25

NELSON GEOTECHNICAL � ASSOCIATES, INC. GEOTECHNICAL ENGINEERS&GEOLOGISTS Main Office Engine inB-Geology Branch 1731 1-135a Ave NE,A-500 5526 Industry.Lane,42 Woodinville,WA 98072 East Wenatchee,WA 98802 (425)486-1669•FAX(425)481 2510 (509)665-7696.FAX(509)665-7692 October 14,2019 Mr. Anthony Zahler 4515-78t Place SW Mukilteo,WA 98275 VIA Email: azahler02(cr�,gmail.com Geotechnical Engineering Evaluation Zahler Residence Development 36XX West Mukilteo Boulevard Everett,Washington NGA File No. 1129119 Dear Mr.Zahler: We are pleased to submit the attached report titled "Geotechnical Engineering Evaluation — Zahler Residence Development—36XX West Mukilteo Boulevard—Everett, Washington." The parcel number for the subject property is 00433600004400. 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 September 3,2019. The site consists of a relatively level to gently sloping parcel covering approximately 0.44-acres. The site is currently undeveloped and is generally vegetated with grass-covered areas and few young to mature trees bordering the property. We understand that the proposed development will consist of constructing a new single-family residence within the central portion of the property. Final development and grading plans have not been prepared at the time this report was issued. Final stormwater plans have also not been developed; however, we understand that stormwater may be directed to on-site infiltration systems, if feasible. We should be retained to review final development plans, including plans for site grading, retaining walls,and drainage prior to construction. We monitored the excavation of six trackhoe excavated test pits at the site on September 19, 2019. Our explorations indicated that the site was underlain by surficial undocumented fill with competent, native glacial soils at depth. It is our opinion that the proposed site development is feasible from a geotechnical engineering standpoint, provided that our recommendations for site development are incorporated into project plans. In general, the native glacial soils underlying the site should adequately support the planned structures. Foundations should be advanced through any loose soils down to the competent bearing glacial material interpreted to underlie the site, for bearing capacity and settlement considerations. These soils should generally be encountered approximately two to three feet below the existing ground surface,based on our explorations. If loose soils or undocumented fill are encountered in unexplored areas of the site, they should be removed and replaced with structural fill for foundation and pavement support. NELSON GEOTECHNICAL ASSOCIATES, INC.