1135 CRAFTSMAN WAY 2018-01-02 MF Import

� Prcliminar}� FinJings from Rcvicw uf Gcotcchnical Reports North Marina llcvclopmcnt � L'•verett, VVashington l�larch 24, 2004 CG Projcct No. 1576 � ''�� ' Somc rcnovation of the marina to thc south is planncd wilh a nc�v marina to thc north. "l hc marn:� and bulkhc�d � improvcments ��ill be dcsigned LY the Yort of[verctt and its consultants. Nc arc not currently in�olvc� with tl�ose improvcments. 1 � SCOPti 1Vc havc bccn authorizcd to rcvicw thc gcot�chnical icports and pro��idc a summ��y of gcotcchnical intpacts to Uic B sitc. Thc intcnt of thcs� scrviccs is to pro�•idc prclimina�} input into projcct dcsign, and also to providc a basis Cor 11 a morc dctailcd gcotcchnical stucly. � � S1�135UIi1�ACI? UA'f:� Litcraturc Rescarcl� � The suUsurface conditions at the sitc ��ary, in gencral, Gom east to west. The westcrn edge of the site ncar Alarinc View Drive is belicved to be underlain by vcry dense glacial soils at a shallo�v dep[h. In the vicinity of the Marinc p Spill Response Corporation (b1SRC) building, these soils are on the order of 30 to 40 (eet decp. At about Nic casa t �acst mid-point of the site, this dcpth is closc to ]00 fect (plus or minus) and Qiis depth scems to be consistent to the westem extent of thc site. �Ve expect some variation of thc depth to fimi native soils. The 2002 URS rcport � for the south bulkhcad wall includes an exaggcrated cross-section that illustrates the subsurface conditions. }lo�vcver, thcir cxplorations do not extend to the dense glacial soils from about thc eastem third point of thc site to � thc west. 1Ve havc attached a copy of this cross-section to this Iettcr. � The upper 20 fcct of soil at the sitc has been interpreted as fill. Therc is some nood debris in this zone, rcportcdl�� from a IumUcr mill previously located on the south side of the site. Thc next I S to 20 feet could be native alluvial , soils or hydraulic filL It is difficult to differentiate behveen these soils as the site is close to the mouth of thc Snohomish River and sand and silt very similar to hydraulic fill are continually being placed by the river. IIclo�v f these soils the explorations encountered 30 feet or more of so8 to medium stiff silt. \Ve note that the URS cross I scction classifies this material as medium stiff to stiff, but that one boring had almost all zcro blo�v coont material ! for 30 feet. Thc blow coimts in this material varicd from 0 to 12. This e�tends past a depth oCabout 70 fcet in the mo;t rccent 6orincs. Re��ic�aing the old borings, it appears that these soils could extend to depths of plus or minus Cornerstone Geotechnical, Inc. 3/`�