1618 47TH ST SE 2016-01-01 MF Import

Gcotecimical Lncinecring Rcpnrt Singlc-Fantily Rcsidcncc Evcrett, AVashineton Dccemhcr 9. 2005 CG I�ilc No. 2017 Pa�c 7 � will nro��idc adcquatc scthsck from thc slu�ic for thc dcsien lffc oi ihc structurc and if proper c�re of thc I slope is maintaincd. , Site Preparations and Gradin� � Thc first step of sitc prcpara�io» sliould b: to strip thc ��cectatiun. topsoil, �ill ur lur�su suils to csposc medium dense to very dense native soils in pacement and building areas. This material should bc removed from the sitc, or stockpiled for laie.- use as landscaping fill. The nsulting subgrade should bc � compaeted to a firm, non-yiclding condition. Arcas obscr��ed to pump or wca��c should bc rcpaired prior to placing hard surfaccs. � The glaeial outwash is considcrod slichtk moi;turc �ensit�cc. AVic expcci thcsc sui!; �t�ould hc morc � difficult to compact to �,uuclural 611 spccifcations in �cct �ticathcr. \\'c rccommend th�t carth�cork hc conducted during the drier months. Additional expcnscs of•.vet ��eather or u�inter construction would � include extra excavation and use of imported fill or rock spalls. During wet weather, alternati��e site preparation methods may Ue nccessary. These methods may include utilizing a smoodi-bucket trackhoc � to complete site stripping and divertine construction tral7ic around prepared subgrades. DisWrbance to the prepared sub��rade may bc minimized by placin{�,a blanket of rock spalls or imported sand and gravcl in traffic and roadway areas. Cutoff drains or ditchcs can also bc hclpfid in rcducing grading custs durine � the wet season. These methods ean Ue evaluated at the time ot consuuction. � Structural Fill GeneraL• All 511 placed bencath buildings, pavemcnts or ather settlement sensiti�e fcatures should hc placed as structural fill. Structural fill,Uy definition, is placed in accordance with prescribed methods and standards, and is monitorcd by an cxpericnced geotechnical professional or soils technician. Field- monitoring procedures�vould include the perfortnance of a represcntatice nu�nber ot in-p!acr dcnsity tcsts to document the attainment of the dcsircd degree of relative compaction. �Iaterials: Imporled structural fill should consist of a good quality, irce-draining granular soil, (�ee of organics and other deletcrious material, and be �eell graded to a ma�imum size of about 3 inches. Imported, all-�veather structural fill should contain no more than � percent fines(soil finer th:m a Standard U.S. No. 300 sic�'e),b�sed on that fraction passing the U.S. 3/�3-incl�sie�r. Cornerstone Geotechnical, Inc. �/2� �