1915 W MUKILTEO BLVD 2018-01-02 MF Import

�` NELSON GEOTECHNICAL N ,• A ASSOCIATES, INC. GEOTECHNICAL ENGINEERS & GEOLOGISTS Main Office 17311 — 135" Avenue NE, A-500 Woodinville, WA 98072 (425) 486-1669 • FAX (425) 481-2510 (425) 337-1669 Snohomish County December I, 2006 John and Dolores Robinson 1915 West MLkiltco Boulevard Everett, WA 98203 Plan Review Letter 1915 West Mukilteo Boulevard Everett, Washington NGA File No. 743206 Engineering -Geology Branch 112 Olds Station Road, Suite C Wenatchee, WA 98801 (509) 665-7696 (Phone/Fax) PWOG IJ--Vcj Dear Mr. and Mrs. Robinson: This letter presents the results of our geotechnical engineering review of the planned slide repairs at the residence located at 1915 West Mukilteo Boulevard in Mukilteo, Washington. INTRODUCTION We have previously prepared a geotechnical engineering report for the project site titled "Geotechnical Engineering Evaluation and Slide Repairs — 1915 W Mukilteo Boulevard — Mukilteo, Washington," dated July 26, 2006. We have been provided with Plan Sheets S1.1 through S4.1, titled, "Robinson Residence Slope Stabilization — 1915 W Mukilteo Blvd, Everett, NVA 98203," dated October I, 2006, prepared by CG Engineering. The City of Mukilteo has requested that we review geotechnical aspects of the provided plans and prepare this letter documenting our opinions regarding plan compliance with our previous report. Plans include constructing a light retaining wall to protect the top of the slope within the western portion of property north of the existing residence. In our geotechnical report, we provided recommendations for retaining wall construction, permanent erosion controls and slope drainage. We also recommended a combination of drainage improvements and erosion control measures to improve the stability of the slopes situated to the northeast and cast of the residence, which are also showing signs of movement. We also