5114 33RD AVE W 2018-01-02 MF Import

Novaek Property 510 Place Everett, Wa. 99-11-10 I. All run-off from any impervious surfaces and the residential structure needs to be collected into a drain system and tightlined into an approved drainage system or down to the bottom of the slope for discharge. This will help insure that no additional water is added into the .slope area. 1. The .site slopes .should be protected from erosion. We do highly recommend that care be taken during and after construction to insure that the vegetation on all slopes is not disturbed outside of the excavation limits. !f it is disturbed, it should be protected using either visqueen or straw. This will help to cut down on surface erosion and prevent any future deterioration of the slopes. All exposed surfaces should be seeded and remained covered until strong growth of the plants/grass has taken place. 3. On a long term basis, the property owner should monitor the slope for any change in vegetation or vegetative matter that could result in erosional problems. 1f these conditions arise, a qualified geotechnical engineer should be notified to assess the situation. 4.5 Seismic Considerations Geotechnical input is commonly sought for the following criteria: • Selection of an earthquake acceleration coefficient (A). • Determination of a site coefficient (S) based on a generalized soil profile type. • Addressing the liquefaction potential of the foundation bearing soil. • Development offoundation and foundation wall criteria. A map of horizontal acceleration prepared by the U.S. Geological Survey for the 1988 NEHRP Recommended Provisions for the Development of Seismic Regulations for new Buildings gives a value of A=0.30 for the Seattle area. Other ground motion coefficient maps have been generated through an extensive study by 13 GES, Inc.