1215 MADRONA AVE 2016-08-24 - Laserfiche WebLink

NELSON GEOTECHNICAL ��A ASSOCIATES, INC. GEOTECHNICAL ENGINEERS & GEOLOGISTS '�tain Office 17311 — 135°'' Avc 1�E, A-500 Woodim�ille, VJA 98072 (425)48G•1669 FAX(425)481-2510 June 12, 2015 Mr. and Mrs. Dennis and Kathy Gustafson 1215 Madrona Avenue Everett, Washington 98203 Geotechnical Engineering Evaluation Gustafson Residence Retaining Wall 1215 Madrona Avenue Everett, Washington NGA File No. 924115 Dear Mr. and Mrs. Gustafson: Enginccring-Gcology Branch 5526 lndustry I.anc, �2 East 4Vcnatchcc, �VA 988�2 (509) 665-7696 PAX (509) 665-7692 This letter summarizes the results of our geotechnical engineering evaluation and stabilization recommendations for the existing concrete rubble retaining walls and top of slope area located below your residence at 1215 Madrona Avenue in Everett, Washington, as shown on the Vicinity Map in Figure 1. Our services were coinpleted in general accordance with our proposal signed by you on April 17, 2015. INTRODUCTION The purpose of this study is to explore and characterize the surface and subsurface conditions within the vicinity of the existing concrete rubble retaining walls and the top of the steep slope, in order to provide our opinions with respect to the existing stability within this area and provide recominendations for improving the stability conditions of the this area. We understand that you recently had some landscaping work performed and uncovered some tiered concrete rubble retaining walls along the top of a steep north- facing slope below the residence supporting a grass yard area. We observed that the walls appeared to have settled somewhat and were in serious disrepair. We understand that you wish to replace these existing walls with engineered retaining walls along with additional slope stabilization measures, and have requested our opinions and recommendations for design and installation of a new engineered retaining wall.