Laserfiche WebLink
Cobalt Geosciences,LLC <br /> - COBALT <br /> -.4 GEOSCIENCES P.O.Box 82243 <br /> Kenmore,Washington 98028 <br /> June 9,2022 <br /> Dave Nolan <br /> Dave.nolan214 rwgmail.com <br /> RE: Geotechnical Evaluation <br /> Proposed Residence <br /> 18xx Holbrook Avenue <br /> Everett,Washington <br /> In accordance with your authorization, Cobalt Geosciences, LLC has prepared this letter to <br /> discuss the results of our geotechnical evaluation at the referenced site. <br /> The purpose of our evaluation was to provide recommendations for foundation design, grading, <br /> and earthwork. <br /> Site Description <br /> The site is located at 18xx Holbrook Avenue in Everett, Washington. The site consists of one <br /> rectangular parcel(No.00549400501500)with a total area of 0.27 acres. <br /> The remainder of the property is undeveloped and vegetated with grasses, ivy, ferns, blackberry <br /> vines,bushes,and variable diameter evergreen and deciduous trees. <br /> The site slopes downward from west to east at magnitudes ranging from 5 to 150 percent and total <br /> relief of about 20 feet. The steeper slopes are near the east property line. These slopes have likely <br /> been created or modified through prior grading (cuts and fills) and are locally faced concrete <br /> walls. The steeper slopes are adjacent to the residence to the east and decrease in magnitude to <br /> the north. The slope relief is generally 8 feet or less. <br /> There are local rockery walls along the north and west property lines. These walls are about 2 to <br /> 4.5 feet tall and face to the north and west,respectively. <br /> The site is bordered to the north and east by residential properties, to the west by Darlington <br /> Lane,and to the south by Holbrook Avenue. <br /> The proposed development includes a new multi-story residence with basement areas. <br /> Stormwater will include infiltration or other systems depending on feasibility. Site grading may <br /> include cuts and fills of 9 feet or less and foundation loads are expected to be light. <br /> We should be provided with the final plans to verify that our recommendations remain valid and <br /> do not require updating. <br /> Area Geology <br /> The Geologic Map of the Everett Quadrangle, indicates that the site is near the contacts between <br /> Transitional Beds,Vashon Advance Outwash,and Vashon Glacial Till. <br /> Vashon Glacial Till includes mixtures of silt, sand, gravel, and clay deposited during glacial <br /> advance. These deposits are typically dense below a weathered zone. <br /> www.cobaltgeo.com (206)331-1097 <br />