3606 W MUKILTEO BLVD 2016-01-01 MF Import

' Gcotechni.:al Enginecring Evaluation Mukiltco IIoulevard Devclopmcnt Evcrett, Washington � March 31, 2003 NGA Filc No. 3G6503 Pagc 8 for importing all-wcather material for fill, �vhich could signi6cantly raise e�rthwork costs. We therefore recommend that carth�eork bc conductcd during tlie dricr sutnmcr months. Even during the summer timc, great care should bc taken not to disturb wct subgradcs under construction traflic. Surface water should bc divcrtcd around arcas to bc cxcavated. If cartlneork is to be accomplished during wet weather, �re recommend ihat a blanket of rock spnlls be placcd in the planned acccss roadway. Thc thickness of thc spall blanket should be bascd on soil conditions at the time the sitc is dcveloped, and thc performancc under heavy equipment. We recommend using a minimum of a 1-foot thickness of spalls in traffic arcas for estimating additional wet ��eather costs. Wct wcathcr construction may rcquirc incrcased ovcrc�cavation of wct matcrial and importing all- wcather matcrial for fill. Lcvcl benches a minimum of 4 fect in width should bc crcatcd on ground inclining steeper than 20 percent that will rcccive fill. Thc bcnches shoiiid hclp kcy the ncw fill inro the nativc matcrial and rcducc sliding potential. Thc levcl benches could bc crcatcd as thc fill is being placed. Temporary and Permanent Slopes l�emporary cuts of up ta 12 fect arc anticipated for basement ��•alls 811d (IC�COlI0i1 VBLIII COf15WChOi1. Tcmporary c�cavation stability is a function o( many factors, such as Uic q�c and wnsisicncy of soils, depth of the cut, surchnrge loads adjncent to the e�cavation, Icngth of time a cut remains open, and Ihc preseuce of surfacc or grounJ �eatcr. It is exccedingly difficult undcr thcse variable conditions to estimatc a stable, icmporary, cut-slope geometry. Thereforc, it should be thc responsibility of the contracror to mnintnin safc slopc configurations, sincc thc contractor is continuously at thc job sitc, ablc to obscrvc thc nature nnd condition of lhe cut slopes, and ablc to monitor the subsurfnce matcrials and ground water Coll(�I1i0175 L'I1ColIn�CfCd. This information is provided solcy for thc bcnefit of thc owner and other design consultants and should not ba conslnied to imply that Nelson Geotcchnicil Associates Inc., assumes responsibiliry for job site safcty. Job sitc safety is thc solc responsibility ofthc projcct contractor. Por planning purposes, wc rcconuncnd that tcmporary cuts in thc on-sitc soils bc no stccper than I.5 Florizontal :l Vcrtical (I.SFL•IV). If these inclinations are not fensible due to the proximity to existing NELSON GEOTECHNICAL ASSOC/ATES, INC.