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Mr. &II Rucker <br /> 25 S�ptembsr 1992 W8396 <br /> , Pape 8 <br /> material should perterally conuin less than 5 percent fine�, baaed on that soil fraction passinp ms U.S. <br /> No. 4 Sisve, and not conUin ditaete particlet preater than B incha: in diameter. It should bs noted <br /> _ that ths ptacsment of structural fill i:, in many ca:ee, wa�ther-dependant. Delays due to inclamant <br /> wsather aro �rommon, even when usinp salect pnnular fill. We recommend that site pradinp and <br /> � tubturtacs ucility vvork pe scheduled for the drier months, if at all posaible. <br /> Emb�nkmaot Fpl <br /> �' P�rtnanent fill placsd on slopes stseper than 5H:1 V(Horizonul:V�rtical► ;,houtd bs keysd and banchsd <br /> into nadve soiis of Ms undarlyinp siope. Rpure 2, Genenl Datail for Slope RII, pnphicdly prosenu ths <br /> • � co�fipundon of a keyed ��d be�chsd hillcide fill embankment. We recommend th�t ths downslops <br /> ksY be cut into undistu�bsd nadve soil. The ksy slot should ba �t least 8 feet wide and 3 fest desp. <br /> , , Th� hillsids bsnchs: cut into tha native soil shouid be at Isaet 4 feet in width. <br /> Tha faca of the embankment ahould be completad to the asme 90 percent density as the body of ths <br /> Y fill. Thit may be accomplished by o:�erbuildinp the embankment and cuttinp back to the compactsd <br /> core. Akematively, q�e s�Kace of the siope may be comp�Med aa h is built, or upon eompletion of <br /> ' the embankment fill placement. <br /> • ' <br /> � �+ In order to provida equipment accesa to the project �urinp exploration activities, the ro e <br /> • con�tructed a temporary crossinp over the ravine near the planned driveway. This temporary oss np <br /> was apparontly conatruMed by loosely placinp fill over a corrupated ADS cuivert. We recommend that <br /> . this loose m�terial be romoved at the time of construction in order to ensure that the unds�lyinp native <br /> soil io�dsquats to suppott the fiil embankment and that topaoil and other orpsnic materialt have been <br /> propsriy spippad from the foundation subprade. Followinp subprade preparation, the embrnkment <br /> ahould be constructed as described above, Additionally,we recommend that the uphill far.e of Me new <br /> embankment be provided with erosion protection in the event that it ia exposed to runninp water. For <br /> embsnkment protection, ws recommend that a one foot thick layar of Quarry spailc be appfiad to ths <br /> alops. These quarry spalls shouid conform to Washinpton Sate Depattment of Transponation <br /> � . Standard Spscifications of Road, Bridpe, and Municipal construction Seaion 9-73.6. <br /> We recommend that project desipns utilize all means possible to rn�nimize excavation cuts and filla on <br /> Me site. On sites with critical and potentially critical slopes, unnecessary or excessive cuts or fi[I can <br /> potentially contribute to reducinp slope stabiliry, repardless ot care taken durinp construction. <br /> F+ <br /> Y , AGRA <br /> farth&Environmental Group <br />