4704 HARBOR LN 2018-01-02 MF Import

' Geolechnical Engineering Evaluation Anderson Landslide Repairs 4704 Harbor lane Everett, Washington September 15, 2009 NGA Pile No. 816909 Page 6 Borings 2 and 3, we encountered light brown to brown -gray, silty fine sand to fine sand with silt and varying amounts of gravel and iron -oxide staining. Borings 2 and 3 were both tenninated in the sand with silt at a depth of 31.5 feet below the existing ground surface. Boring 4 was drilled within the upper backyard area behind the residence. At the surface, we encountered approximately 7.0 feet of medium dense, brown and gray -brown, fine sand with silt and roots. We interpreted this material to be fill. Below the fill, we generally encountered approximately 8.0 feet of medium dense, brown -gray, fine to medium sand with silt, with a layer of brown -gray silt, interpreted to be native glacial soil. This sand with silt material was underlain by medium dense to dense, brown -gray, fine to medium sand. Boring 4 was tenninated in the sand at a depth of 31.5 feet below the existing ground surfitce. Boring 5 was drilled in front of the residence. Below approximately 4.0 feet of medium dense, brown silty fine sand interpreted to be fill, we encountered approximately 3.0 feet of medium dense, orange - gray, fine sand with iron -oxide staining. We interpreted this material to be native outwash. Below the sand, we cncountered approximately 10.0 feet of very stiff to hard, gray to brown silt with fine sand and ennd layers. Below the silt, we encountered approximately 5.0 feet of very dense, brown -gray fine to medium sand with silt grading into fine to medium sand. Boring 5 we tenninated in the sand at a depth of 27.5 feet below the existing ground surface. lNand Auerrc: Hand Augers I, 2, and 3 were located on the slope within the landslide area. At the surface of all of the hand augers, we encountered approximately 1.0 to 2.5 feet of loose, brown -gray, silty fine to Imedium sand to fine sand with silt with varying amounts of gravel and cobbles. We interpreted this material as landslide debris. Below the landslide debris, we encountered dense, brown -gray, silty tine l sand, to fine to coarse sand with silt and varying amounts of gravel. We interpreted this material as native l glacial soil. Hand Auger I was tenninated in the silty sand at a depth of 7.0 feet, and band Auger 2 was terminated in the fine to coarse sand with silt at a depth of 7.0 feet below the existing ground surface. Below the fine to coarse sand in Band Auger 3, we encountered very stiff to hard, blue -gray silt with fine sand. Hand Auger 3 was tenninated in the silt at a depth of 3.5 feet. NELSON GEOTECHNICAL ASSOCIATES, INC.