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m <br />June 2s, 20G <br />David und Judy King <br />I.&A ]ob No. 5A07G <br />Pagc 9 <br />F.XCAVATION AND FILL SLOPF.S <br />Undcr no circumstancc should cxcavation slopcs be grcatcr than the limits specificd by local, <br />state nnd fcderal safety regulations if workcrs hnvc to perform conswction work in excttvntcd <br />tveas. Unsupported tcmporary cuts grcater than 4 fect in height should be no steeper than 1- <br />1/41i:IV in the surficial fill, no stecper than 11L•1V in the topsoil nnd loose to medium-dense <br />weathercJ �spc:ance SanJ soils, and no stceper than I/2li:l V in Uie underlying dcnse Esperancc <br />Sand and 'nard Whidbcy formation soils. Pcrmancnt cut b.�nks, ii rcquircd, should bc na stecper <br />thnn 2-1/2FI:1V in fill, topsoil and loosc to mcdium-dcnsc wcathtrcd Hsperance Sand soils nnd <br />no stceper than 211:1 V in densc Espc;rance Sand and harJ Whidlxy fonnation soils. The soils <br />and thc stability of cut slores should be obscrvcd and ecrificd by a gcotechnical engincer during <br />cxcavation. <br />Pcnnancnt fill cmhankments rcyuircd to support structural or tra�c loads sR�ould be constructcd <br />wilh compactcd swctural fill placcd over proof-rolled undisturbcd, nativc, dense Esperancc Sand <br />or hard Whidbcy lormation dcposits aflcr lhc surficial unsuitablc soils are strippcd. Pcrtnanent <br />fill to bc placed on slopcs stceper Uian 15% gmdc should bc tLlaincJ sttucturally. Slopin� <br />gmund stecper tliln 20% grade mer which f II is to be placeJ should be benchcd •.r'th veriir.d <br />slcps no morc tha�i 4 fcct high allcr stripping of unsuitablc surficial soils. Thc slopc ol' <br />pcnnancnt fill cmhankmcnts shauld not bc stc�:per lh:m 211:1 V. [ ipon complction, .lic sloping <br />facc ofprrm;incnt lill rmhankmrnts shut�ld hr ihuruughly cwnr,ictc�l to a nun-yiclding statc �sith <br />❑ h��r-�rick. <br />1 hr ;ih���r rr�uinmrn�lcil :ul ;�n�l fill tilu�••cs �rc undcr thr ;issumptiun that gruundwatcr sccpagc <br />�sill not bc encountcrcd Juring constniction. If groundwater seepage is encountered, thc <br />cunstniction shouW M: immediatcly hulted nnd lhc slope stability rc-evaluate.l. The slopcs may <br />havc to bc flattcncd ard olher mcasures taken to stabilize ihe slopcs. Surface runoff should not <br />LIU & ASSOCIATES, INC. <br />