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Robert M. Pride, LLC Consulting Engineer <br /> November 3, 2021 <br /> Mr. Tony Slaughter <br /> c/o Clint Russell <br /> 310 Seven Mile Place <br /> Walla Walla,WA 98144 <br /> Re: Geotechnical Recommendations <br /> Proposed Retaining Wall ` City of Everett <br /> 1319 Pinkerton Avenue EVERETT Reviewed for Permit 01/19/2022 <br /> Everett,Washington <br /> Dear Mr. Russell, <br /> This report provides recommendations for the new rockery retaining wall at the lower <br /> side yard of the existing Slaughter residence at 1319 Pinkerton Avenue in Everett. It is <br /> understood that the existing slope on the east side of the residence has experienced <br /> surficial soil movement that requires permanent protection with a new wall. A site plan <br /> with a cross section shows the location of this existing slope that will require installation <br /> of an eight foot high rockery wall that will be about 8o feet in length to provide <br /> permanent lateral slope stability. <br /> Geotechnical Recommendations <br /> On the basis of our site investigation it is recommended that the new wall extend up 7 to <br /> 8 feet above the toe of the existing slope. The base of the new rockery wall will be <br /> supported by dense glacial soils that will be three to four feet below existing slope grades <br /> as determined by the two test pits dug at the north and south end of the proposed wall <br /> alignment. The upper fill soils as exposed in these test pits consisted of loose fill <br /> classified as silty sands, and the underlying glacial soils were dark brown and dense silty <br /> sands that will prove excellent support for the new rockery wall. <br /> We recommended that the base rocks extend down two feet below the toe of this <br /> existing slope to be supported on the dense glacial soils. A bearing value of 2000 psf <br /> will be used for support of the base rocks, and the slope face of this wall should be <br /> installed with a 1H:4V gradient from top to bottom. <br /> Summary <br /> The site plan and cross sections prepared by Clint Russell were reviewed and approved <br /> for the proposed wall installation. Appropriate filed inspections will be required during <br /> site excavation and installation of the wall system along with placement of the <br /> compacted backfill up to final grade. A final field memo will be prepared covering the <br /> wall installation details, and this memo will be submitted to the city of Everett. <br /> Robert M. Pride, LLC Page 1 <br /> 13203 Holmes Point Drive NE Kirkland, WA 98034 <br />