4110 CLIFF DR 2022-01-26 - Laserfiche WebLink

NELSON GEOTECHNICAL ASSOCIATES,, ES,, INC. GEOTECHNICA.L. ENGINEERS & GEOLOGISTS Main Office 17311-135- Ave NE, A-500 Woodinville, WA 98072 (425) 486-1669 • FAx (425) 481-2510 February 2, 2018 Wayne Smith 22121-17th Avenue SE #109 Bothell, Washington 98012 wsmith.re@gmail.com Geotechnical Engineering Evaluation Cliff Drive Short Plat Residence Development 4110 Cliff Drive Everett, Washington NGA Job No. 1021318 Dear Mr. Smith: Engineering -Geology Branch 5526 Industry bane, #2 East Wenatchee, WA 98802 (509) 665-7696 - FAx (509) 665-7692 R kL� E"EWE APR 2 7 2018 DD CITY OF EVERETT Permit Services We are pleased to submit the attached report titled "Geotechnical Engineering Evaluation — Cliff Drive Short Plat Residence Development — 4110 Cliff Drive — Everett, Washington." This report summarizes our observations of the existing surface and subsurface conditions within the property, and provides general recommendations for the proposed site development. Our services were completed in general accordance with the proposal signed by you on December 22, 2017. The property is currently occupied by an existing single-family residence with a daylight basement within the upper eastern portion of the property. The property is generally situated on moderately sloping ground that descends from the eastern property line along Cliff Drive to the western property line along Olympic Boulevard. We understand the proposed development will consist of subdividing the property and constructing a new single-family residence within the lower western portion of the site. Final grading and stormwater plans were not available at the time this report was prepared. We explored the proposed development area and site slopes with four trackhoe excavated test pit explorations. Our explorations indicated that the site was generally underlain by undocumented fill with competent native glacial soils at relatively shallow depths. It is our opinion that the planned development is feasible from a geotechnical standpoint, provided that our recommendations are incorporated into the design and construction of this project. We have recommended that the new residence be founded on medium dense or better native glacial soils for bearing capacity and settlement considerations. These soils should generally be encountered approximately 1.0 to 3.0 feet below the existing ground surface, based on our explorations. However, deeper areas of loose soil and/or undocumented fill could also exist within unexplored areas of the site. In particular we anticipate greater depths of fill in the near vicinity of the existing sewer and water utilities extending west of the existing residence towards Olympic Boulevard. If undocumented fill is encountered in unexplored areas of the site, it should be removed and replaced with structural fill for foundation and pavement support, or foundations should be extended down to be supported directly on the native glacial soils.