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i <br /> � f3MP C120: Temporary and Permanent Seeding <br /> � I'u���u.�c Sccding is inl�ndcd t��rcducc crotiion h� stahili;:inr cxpc�scd soi!�. ,� <br /> w�l l-cstablishcd vcgctativc covcr is onc of�hc must cliccti�c metho�� o( <br /> rcducing crosiun. <br /> � Cnnditinn.�� n/'L'sc� • Secding may bc uscd throughoul thc projcct on dislunc�d arcas that <br /> have rcached �inal gradc or that �vill rem�in um�orkcd fi�r morc than <br /> 30 days. <br /> � • Channcls thal ���ill bc �-cgct�tcd should Uc instnllcd beforc m�jor <br /> cm-thwork and h��drosccdcd ���ith a Bondcd Pibcr Malris. Thc <br /> vegetation should be �t�cll established (i.c., 75 percent co��er) beforc <br /> � ���ater is allo���cd to flow in thc ditch. 1'Vith channcls that �+�ill havc <br /> high Ilows, crosion conuol blankets should be inslallcd over ihc <br /> liydrosecd. If��egetation cannot be cstablished from secd bcforc �oatcr <br /> � is allowcd in the ditch, sod should Ue installed in the bouom of thc <br /> ditch ovcr hydromulch and blankets. <br /> 1 • Retention/dc�ention ponds should be seedcd as rcyuired. <br /> • Mulch is required at all times hecausc il protccts sccds li'om hcat. <br /> moisturc loss, and transport due to �vnoff. <br /> � • All diswrbcd arcas shall be rcviewed in latc August to carly Scptcmhcr <br /> and all sccding should be complcted by the cnd uf Scptembcr. <br /> � Otherwisc, vegctation will not cstablish itself enough to provide morc <br /> than avcragc prolection. <br /> • At finnl site stabilization, all disturbed areas not othen��ise vcgetated ��r <br /> � stabilized shall be secded and mulched. Pinal stabilization means thc <br /> complction of all suil disturUing ac�ivities at thc sitc and thc <br /> cstablishmcnt of a pcnnanent vegetative cover, or equivalent <br /> � pemianent staUili•r.ation measures(such as pavement, riprap, gabions <br /> or gco�extiles) which wi11 prevent erosion. <br /> De.si�n nnd • Secding should be donc during thosc seasans most conducive to <br /> � Iu�7nNnrinii growth and will vaiy with the climatc conditions of thc rcgion. <br /> SpeciJicntinrrs Local cxpericnce should be used to detcnnine the appropriate <br /> sceding periods. <br /> � • The optimum seeding windows for western Washington arc April I <br /> through Junc 30 and Scptcmbcr I thmugh Octobcr I. Secding that <br /> � occurs behveen July 1 and August 30 will reyuire ireigation until 75 <br /> percent g�ass co��er is established. Sceding Ihat occws bctwecn <br /> October 1 and March 30 will require a mulch or plastic covcr untit <br /> I 75 perccnt brass cover is established. <br /> • To prevent seed f'rom being washed away, cunlniu iiiai uli icyuirc.l <br /> surlacc walcr caitrol mcasures havc bccn installcd. <br /> I <br /> i <br /> i �ebruary 2005 Volume ll- ConsVuction S(ormwafer Pollufion Prevenfion 4-13 <br /> I <br /> � �� <br /> I <br />