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• 5505 Broa�lwa�� J April S, 20J1 <br /> . Errreu H'oshingrnn _______________ k(i/1'rnjec(No_iQl/-173 <br /> it is placed. As the amount ef fines (Ihat portion passing tlte US Na 200 xicvc) incrcases, soil <br /> becomcs incn;asingly scnsitivc to small chanFcs in moisturc eontcnt xnd adcquatc compaction <br /> becomes morc difficult or im�ssible to achicve. Suils containing more than about five percrnt <br /> fines cannot bc consistently compactcd to a dense, non-yielding condition when the moislwc <br /> contcnt is more lhan two perccnt above or below optimum. Optimum moisturc contcnt is that <br /> moislure which results in the greatest compacted dry density with a specified wmpaclive effort. <br /> N�m�rganic site soils are only considered suitable for sin�clural fill provided Uiat their moisturc <br /> content is within about two percent uf the optimum moislurc Icvcl as dcicrmincd by t!ic AST�M <br /> D1557 lcsl. fxcavated sile soils may not bc suitable f'or re-use as structur.�l fill dcpending on thc <br /> moismre cantent ond wcather wnditions al the time oC construction. If soils are stockpiled for <br /> futu�c rcuse and wet weather is anticipxled, the riockpile s6ould be prmected wiUi plastic <br /> sheeling that is securely anchacd. <br /> E�cn Auring dry wcalhcr, moisturc wnditioning(i.c. windmwing and drying)of site soils to bc <br /> rcused as slructural fill m�y be required. I:vcn during [he summcr, dclays in grading can occ:ur <br /> duc to cxccssivcly high moistw•c conditions of thc soils or duc to prccipitolion. IC wet wcalhct <br /> occws, the upper wcticd pnrtion of thc sitc soils m�y nccd to bc scarificd nnd allowed to dry <br /> prior to further earthwork, or may neeJ to be wasieJ Gom the site. <br /> Ptior to use, a RGI reprcsentative should observe and tesl all materials imported lo Ihe site for <br /> use as strucwral filL Placement and compaction of sfructurnl fill should be observed by RGI. A <br /> rcprescntalive number of in-place density tests shnuld lie perfonned as thc fi!I is lx:ing placcd to <br /> continn that thc rccommcnded lcvcl ol'compaction is achicvcd. <br /> CU'1'ANU FILI,SLOPES <br /> All permenent cut and fill slopes Should be graded with a finished inclina�ion no grcaler Uian <br /> 2H:1 V. Upon complclion oC conslruction, U�e slopc face should be trnckualked, compacted and <br /> vcgctatcd, or p;ovided with other pliysical means to guard against erosion. All fill placed fur <br /> slope conshvction should mcet the stn�ctunl fill requiremcnts described above. <br /> Pinal gr;iJcs :d thc top of thc slopcs must promotc surfacc drainagc away from the slopc crest. <br /> Watcr must nnt be nllowed to Flow in an uncoMrolled fashion over lhe slope face. If it is <br /> ncccssary to dircct sudacc runoft'towards thc slopc, it should bc controlicd at U�c top of thc <br /> slopc, pipcA in a closcd conduit inslellcJ on thc slopc I'acc, and t�kcn to wi appropriatc point of <br /> discharge I>eyond Ihe toe of thc slope. <br /> �Vc trus� this information mccLs your currcnt nccds. Plcasc call us if you havc any qucstions or <br /> nced addilional informnlion a((425}A I S-O551. <br /> Sinccrcly, �M�x�� <br /> �c�'���Qp WAR��M �!_ <br /> Tnt: Ru.t;v Cei�ur,tNc. � 1� o, �� <br /> /�/- / y`� � °x <br /> .�%���/ Gf/ <br /> KristinaM. Wcllcr,P.Ii. A�'o,�Rc331�Z� �'a <br /> cisn;�v <br /> ScniorProjectLngineer SS/p�rp�,�G `1/'�//2 <br /> Attachmcnls: Figwc 1 L'colo�,y Block 1Vall Dctail <br /> Tuti Rii,e�� GKo��e,lrvc <br />