5107 SOUND AVE 2017-01-14 - Laserfiche WebLink

7uly 21, 2014 'I'wo Single-Family residen�es L&A Job Na 14-065 Page 10 SITE PREPARATION AND GENERAI� GRADING Vegetation within construction limits should be cleared and grubbed, while vegetation outside of �onstruction areas shouid be protected and rnaintained. Loose topsoil, disturbed soil, and weak weathered s�il should be completely stripped down to hard silt and/or medium-dense sand deposit within building pads of the proposed new residences. The exposed soils should be compacted to a non-yielding state with a vibratory co.tnpactor and proof-rolled with a piece of heavy earthwork equipment. EXCAVATION ANI) FILL SLOPES �J�,�,�� ;;r�,��.�� sl�s��l�l �x��v�tion slopes be steep�r than the limits specified by local, s�ate and feclei-aI sale�y regu�laiic�r�s. �T��sup�o�tecl ier��ora�y� ��ts b�ea#�r �h�n � fee? in height should be no steeper than 1H:1V in topsoil, disturbed soil, and weathered soil, no steeper than 3/4H:1V in the medium-dense advance outwash sand soil, and no steeper than 1/2H:1V in the hard Whidbey formation silt soil. Permanent cut banks should be no steeper #han 2-1/4H:1V in topsoil, disturbed soil and weathered soil, and no steeper than 1-1/2H:1V in the underlying medium-dense advance outwash and hard silt soils. The soil units and the stabiliiy of cut slopes should be observed and verified by a geotechnical engineer during excavation. Permanent fill embankments required to support structural or traffic load should be constructed with compacted structural fill placed over undisturbed, proof-rolled, firm, native soil after the surficial unsuitable soils are completely stripped. Permanent fill to be placed over slopes steeper than 15 percent grade should be retained structurally. The exposed ground exceeding 20 percent grade should be benched with vertical steps not LIU � ASSOCIATES, INC.