1617 EDGEMOOR LN 2016-11-10 - Laserfiche WebLink

ww N Main Office I7311-135" Ave NE, A-500 Woodinville, WA 98072 (425) 486-1669 • FAX (425) 481-2510 June 15, 2016 Mr. Bruce McKinnon 1617 Edgemoor Lane Everett, WA 98203 NELSON GEOTECHNICAL ASSo►cIATEs, INC. GmTECHNICAL ENGINEERS &'GEOL,OCISTS Engineering -Geology Branch 55261ndustry Lane, #2 East Wenatchee, WA 98802 (509) 665-7696 • FAX (509) 665-7692 Retaining Wall Installation Final Summary Letter McKinnon Residence Retaining Wall 1617 Edgemoor Lane Everett, Washington NGA File No. 9106B 15 Dear Mr. McKinnon: This letter summarizes our geotechnical construction monitoring services for the new retaining wall and slope stabilization improvements that were constructed near the top of the steep slope area below your residence located at 1617 Edgemoor Lane in Everett, Washington. Introduction The project consisted of the installation of a new pin pile retaining wall that was supported with helical tieback anchors to stabilize the yard area along the top of a steep slope area. A steep northeast -facing slope is located northeast of the existing residence below a relatively level yard area. We previously prepared a geotechnical report for the site titled "Geotechnical Engineering Evaluation — McKinnon Residence Retaining Wall — 1617 — Edgemoor Lane - Everett, Washington," dated December 2, 2015. As part of that study, we recommended a pin pile retaining wall supported with mechanical anchors be constructed along the top of the steep slope to stabilize the affected area. We also recommended drainage improvements, as well as covering the slope within the vicinity of the new wall with erosion control material and vegetation. We have since reviewed the wall design and monitored the wall installation.