4704 HARBOR LN 2018-01-02 MF Import

From 10/30/2009 12:30 #230 P.002/003 N G� Main Office 17311 — 135" Avenue NE, A-500 Woodinville, WA 90072 (425) 406-16G9 FAX (425) 401-2510 (42b) 337.1669 Snohomish County DATE: October 30, 2009 NELSON GEOTECH N ICAL ASSOCIATES, INC. GEOTECHNICAL ENGINEERS & GEOLOGISTS TO: Kick and Holly Anderson Fngincenng-Geology Branch 437 East Penny Road Wenatchee, WA 98801 (509) 665 7696 FAX (509) 665-7692 MEMORANDUM CC: John Dippold— Carney Bartley Spellman Eileen Mattes — Pemco Insurance FROM: Khaled M. Shawish, PE Bala Dodoye-Alali RE: Anderson Landslide Repairs Erosion Control System 4704Ilarbor Lane Everett, Washington NOA File No. 816909 This memo suuuuarizes our observations of the installation of the recent erosion control measures at the Anderson property in Everett as recommended in our memo dated October 6, 2009. We visited the site as the contractors were prepping the area that would receive the erosion control matting. We observed that a silt fence was installed near the property line within the landslide scarp area. fhc silt fence was buried into the ground and secured by metal stakes. We also observcc as the erosion control matting was placed on the slope. The recommended CONTEChI TRM C-45 was not available, and we approved the use of Vivax} C350 matting. The matting was secured at the top by embedding it in a shallow trench and staking it using metal stakes. The matting was rolled out and laid down as (lush with the ground as possible, and was generally staked at intervals of G feet, based on the contours of the underlying ground. Based on sonic areas of loose soil, the stakes varied in length from 3 feet to 5 feet long. Smaller pins were also used in difficult areas, such as around existing tree and stumps to ensure a tighter fit.