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March 30,2009 <br /> • HWA Yrojcct No. 2009-030-21 <br /> fincs sliould be non-pinstic. Note,thesc azc additional restrictions on the <br /> structural fill materials described in Section 3.G.1; <br /> • The ground surfnce witl�in thc construction ares should be gradcd to promotc <br /> rApid runoff of precipitation,and lo prcvent surlace water from ponding; <br /> • No soil should be Ieft uncompacted so it can absorb water. 7�he grotmd <br /> surface within thc construction area should be sealed by a smootl�drum <br /> y vibrntory roller or equivnlent. Soils which Uccome too wet for compaction <br /> should bc removed nnd repinced with cican granulnr matcriuls; <br /> • Gxcavation and placement of fill should be observed by the geotcclmicul <br /> cmisultant to verify that all unsuit�blc materials are removed and suitable <br /> compaction and site drainage is achieved;��nd � <br /> • 13ales ofstruw und/or geotextile silt fenccs sliould'be slrutcgicuily locuted to <br /> control erosion. <br /> �, <br /> 3.GA Underground Ulilitics <br /> We miticipate lhal the projecl will includc rclocation of some existing underground <br /> utilitics,as wcll us installntion of new underground utilitics. Wc recommend thnt any <br /> existing utility lincs bcncath proposed structural elements bc rcmoved rathcr than <br /> abfmdoued. If,aftcr tlie removal of such utilitics, there m•e nny loose or soR areas within <br /> tlic utility trcuch backfill,thcy should be over-excnvatcd and replaced with structural fill. <br /> . . <br /> 3.6.5 Pipc 13edding and l3uckfill <br /> Genernl recommcndutions rolativc to ncw pipe bcdding nnd utility trcnch buckfill includc: <br /> • Pipe Ueddiug mnterial,plsiccmcnt,compaction,and shaping should bc iu <br /> smcord,u�ce with the project specificntions und the pipe manufacturer's <br /> recomnieuded ons. As n minimwn, tUe pipe bedding should mect thc gradalion <br /> requirements f� Gravel iiuckfill for Yipc Zone Bedding, Section 9-03.12(3)oP <br /> tha 2006 WSUOT Stnndt�rd Specifications. <br /> • Pipc Ucddiug�untcrials should be pinced on relntively undisturbcd nutivc soils, <br /> or compacted fill soils. If thc native subgrade soils are disturbed,the disturbed <br /> mtacrial should be removed and replaced�sith compucted bedding muterial. <br /> • ]n urcas whcrc thc trcncii hottom encountcrs very sott or organic-rich subgrade <br /> soils, it may be ncccssnry to ovcr-cxcavoie the unsuitnble materiel and backfill <br /> zoo9�o�0:i n�,n«,e 12 �nvn Geoscn:rvcis�nc <br /> /�� <br />