2710 VIEWCREST AVE 2016-01-01 MF Import

Thomas Kelly JN 95192 June 7, 1995 Page 6 ths walis should be accomplished with hand-operated equipment to preoent the walls from being overloaded by the higher soil forces that occur during compaction. Exc.av�tLops �nd_Slopes Excavation slopes should not exceed the limits specified in local, state, and national goveinment safety regulations. Temporary cuts to a depth of about 4 feet may be �ttempted vertically. Based upon Washington Administrative Code (WAC) 296, Part N, the soil type at the subject site would be classified as Type B. Therefore, temporary cut slopes greater than 4 feet in height cannot be excavated at an inclination steeper than 1:1 ' (Horizontal:Vertical), extending continuously behveen the top and the bottom oi a cut. The above recommended temporary slope inclination is based on what has been successful • at othor sites with similar soil conditions. Temporary cuts are those that will remain unsupported tor a relatively short duration to allow tor the construction of foundations, retaining walls, or utilities. Temporary cut slopes should be protected with plastic sheeting � � ' �,+,_ - during wet weather. The cut slopes should also be backfilled or retained as soon as I � • possible to reduce the potential Tor instability. Please note that the sands can cave � '��'y�.`•. suddenly and without waming. Uti;iry contractors should be made especially aware of this � >, :�':'?� q . • :�1� ,. potential danger. � t,:F � _,_:. - .F`L` �� ,. All permanent cuts into native soils should be inclined no steeper than 2;1 (H:V). F(II slopes .., ,. - � �+ � - should also not be constructed wfth an inclinetfon greater than 2:1 (H:V). To reduce the ea.. •• potential for shallow sloughing, fill must be compacted to the face of these slopes. This � Y`•" could be accomplished by overbuilding the compacted fill, and then trimrning it back to its ' • '�' � ; final inclination. Water should not be allowed to flow uncontrolled over the top of any �. �� '' ,�. temporary or permanent slope. Also, all permanently exposed slopes should be seeded � with an appropriate species of vegetation to reduce erosion and fmprove uhe stability of the surficlal layer of soil. Any disturbance to the existing slope outside of the building limits may relduce the stabiliry of the slope. Damage to the exfsting vegetation and ground should be minimized, and any dfsturbed areas should be revegetated as soon as possible. Soil from the excavetion should not be placed on the slope, and this may require the off-site disposal of any surplus soil. LC�iIIAg�Consid e[�Sions We recommend the use of footing drains at the base of f�otings, where (1) crawl spaces or basements will be below a structure, (2) a slab is below the outside grade, or (3) the (ili0"IP.CII CONtiUI.'I'AN'IS.IN(: