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r <br /> NELSON GEOTECHNICAL <br /> N19�A AssociATEs, INC® <br /> GEOTECHNICAL ENGINEERS & GEOLOGISTS <br /> Main Office Engineering-Geology Branch <br /> 17311—1351 Ave NE,A-500 5526 Industry Lane,#2 <br /> Woodinville,WA 98072 East Wenatchee,WA 98802 <br /> (425)486-1669• FAX(425)481-2510 (509)665-7696 FAX(509)665-7692 <br /> February 17,2015 <br /> Mr.Robert Packer <br /> 1209 Madrona Avenue <br /> Everett,Washington 98203 <br /> Retaining Wall Installation Final Summary Letter <br /> Packer Residence Retaining Wall <br /> 1209 Madrona Avenue <br /> Everett,Washington <br /> NGA File No. 87101314 <br /> Dear Mr. Packer: <br /> This letter summarizes our geotechnical construction monitoring services for the shotcrete retaining wall <br /> and slope stabilization improvements that were constructed within the steep slope area below your <br /> residence located at 1209 Madrona Avenue in Everett, Washington. <br /> Introduction <br /> The project consisted of the installation of a new shotcrete retaining wall that was supported with pin <br /> piles and grouted tieback anchors to stabilize the previous landslide area and existing block retaining <br /> walls within the vicinity of the landslide. <br /> A steep northwest-facing slope is located north of the existing residence. A series of retaining walls had <br /> been constructed on the property above a ravine and partially on the property to the west within the steep <br /> slope area. A landslide occurred on the slope below the walls in November 2012. We were retained to <br /> evaluate the steep slope, landslide, and existing walls, and provide mitigation measures to stabilize the <br /> steep slope, landslide area and existing block walls. We prepared a geotechnical report titled <br />