2710 VIEWCREST AVE 2016-01-01 MF Import

Thomas Kelly JN 95192 Ju�e 7, 1995 Page 6 the walls should be accomplished with hand•operated equipment to prevent the �valls from being overloaded by the higher soil torces that occur during compaction. �Xc_�y�YLop��Sl.opg� Excavation slopes should not exceed the limits specified in local, state, and national government safety regulatlons. Temporary cu's to a depth of about 4 feet may be attempted vertically. Based upon Washington Administrative �ode (WACj 296, Pari N, the soil rype at the subject site would be classified as Type ki. "fherefore, temporary cut slupes greater than 4 teet in height cannot be excavated at an inclination steeper than 1:1 (Horizontal:Vertical), extending continuously between the top and the bottom of a cut. The above recommended temporary slope inclinatfon is based on what has been successful at other sites with similar soil conditions. Temporary cuts are those that will remain unsupported tor a ralatively 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 possible to reduce the potential for instability. Please note tnat the sands can cave suddenly and without warning. Utility contractors should be made especially aware of this potential danger. All permanent cuts into native soils should be inclined no steeper than 2:1 (H:V). Fill slopes should also not be constructed with an inclinatfor greater than 2:1 (H:�. To reduce the potential for shallow sloughing, fill must be compacted to the face of those slopes. This could be accomplished by overbuilding the compacted fill, and then trimrning it back to its tinal inclination. Water should not be allowed to flow uncontrolled ove; the top of any temporary or permanent siope. Also, all permanently exposed slopes shiould be seeded with an appropriate species of vegetation to reduce erosion and improve ihe stability of the suriicial layer of soil. Any disturbance to the existing slopa outsido of the building limits may reduce the stability ot the slope. Damage to the existing vegetation and ground should be minimized, and any disturbed azeas should be revegetated as soon as possible. Soil from the oVcavat�on should not be placed on the slope, a�d this may require the oK-site dfsposai of any surplus soil. A[aiaagg Considerati2n& We recommend the use of tooting drains at the base of footings, where (t) crawl spaces or basements will be below a structure, (2) a slab is below the outside grade, or (3) the .iI:Ol7:Cli CnNtiUI'I'AN'IC,INC