3815 SHORE AVE 2020-05-20 - Laserfiche WebLink

INTRODUCTION This report presents the results of our geologic evaluation at your proposed single-family residential project, in the Everett area of Snohomish County, Washington. The site is parcel number 00433600001800, located at 3815 Shore Avenue, as shown on the Vicinity Map in Figure 1. You have requested that we complete this report to evaluate subsurface conditions and provide recommendations for site development. For our use in preparing this report, we have been provided with a Site Plan by Omega Engineering dated October 24, 2017 and a Drainage Report by Omega Engineering dated October 27, 2017 PROJECT DESCRIPTION The development will consist of demolishing the existing single family residence, driveway, and pool and.then constructing a new two-story single-family residence and driveway on the footprint of the existing residence in the central portion of the site. We have not been provided with a grading plan, but understand that you plan to fill the existing pool and that you plan to include a basement in the construction of the single family residence, which will require temporary cuts down approximately 12 feet from the existing ground surface. You also plan to improve drainage by collecting surface water prior to it flowing over the slope and tightline it down the slope. The project site is mapped by the City of Everett as a landslide hazard critical area,with areas of medium (<15% slope) and very high (>15%slope) risk. SCOPE The purpose of this study is to explore and characterize the subsurface conditions and present recommendations for site development. Specifically, our scope of services as outlined in our Services Agreement, dated April 19, 2017, includes the following: 1„ Review available geologic maps for the site. 2. Explore the subsurface soil and groundwater conditions in the area of the planned residence and steep slope. 3. Evaluate pertinent physical and engineering characteristics of the soils encountered in two test pits excavated at the site, 4. Prepare a geotechnical letter containing the results of our subsurface explorations, and our conclusions and recommendations for geotechnical design elements of the project. SITE CONDITIONS Surface Conditions The project site is about 0,51 acres in size and has maximum dimensions of approximately 280 feet in the northwest to southeast direction and 75 feet in the northeast to southwest direction. Access to the site is provided by Shore Avenue to the east. The site is also bordered by existing residential acreage to the northeast and southwest. To the northwest, the lot,is bordered by BNSF right-of-way adjacent to Puget Sound waterfront. A layout of the site is shown on the Site Plan in Figure 2. The ground surface within the site is generally,level to gently sloping down to the northwest with an abrupt steep slope dropping approximately 90 feet down along the northwestern side Robinson Noble, Inc.