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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 <br />1319 Pinkerton Avenue <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 />