5402 25TH AVE W 2016-01-01 MF Import

• ' City of Everett ( • • Go Ron and Kelly Krueger • August 22, 2007 Page 6 (Horizontal:Vertical) from tfie top of the slope to the bottom of the excavation. Under specific recommendations by the geotechnical engineer, excavation cuts may be mod�ed for site conditions. All permanent cuts into native soils should be inclined no steeper than 2:1 (H:V). Fill slopes should not exceed 2H:1�. It is important to note that sands do cave suddenly, and without waming. The contractors should be made aware of this potential hazard. Water should not be a�lo�ved to flow uncontrolled over the top of any temporary or permanent slope. All pemianently exposed slopes should be seeded with an appropriate species �f vegebation to reduce erosion and improve stability of the suficial layer of soil. DRAINAGE CONSIDERATIONS: Footing drains are recommended at the base of all footings and retaining walls. These drains should be surrounded by at least six (6) inches of one-inch-minus washed rock wrapped in non-woven geotextile filter fabric (Mirafi 140N, Supac 4NP, or similar material). At the highest point, the perfurated pipe invert shouid be at least as low as the bottom of the fuoting and it should be sloped for drainage. Ali roof and surface water drains must be kept separate from the foundation drain system. No groundwater was observed in either of the 2 test holes during the fieldwork, however, recent rains created an upper soil "moist" zone. This engineer recommends improved perimeter footing drains during the house addition and lower level project. Seepage into the planned excavation is possible, and likely if exr,avation occurs during winter months, and if ancountered should be drained away from the site by use of drainage ditches, perforated pipe, French drains, or by pumping from sumps interconnected by shallow connector trenches at the bottom of the excavation. The excava!ion of the site should be graded so tl�at surface water is directed off the site and away from the tops of slopes. NJater should not be allowed to stand in any area where foundations, slabs, or pavements are to be constructed. Any exposed slope� to be covered with plastic to minimize erosion. Final site grading in areas adjacent to buildings should be sloped at least two (2) percent away from the building, except where the area adjacent to the building is paved. GENERAL EARTHWORK AND STRUCTURAL FILL: The proposed building and pavement areas should be stripped and cleared of all surface vegetation, all organic matter, and other deleterious material. The stripped or removed materials should not be mixed with any materials to be used as structural fili. Y�Z