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BMP C120: Temporary and Permanent Seeding <br />Puqrosc Sceding is intcnded to reducc crosion by stabilizing csposed soils. A <br />�ecll-cstablished vegctati��c covcr is one of the mosl effcctive methods of <br />rcducing �rosion. <br />Condi�inns njUcr ' Sceding may be used throu� io�t the projecl on disturbed arcas that <br />h:�vc rcachcd final cradc or th�t ���ill rcmain umvorked for more than <br />30 days. <br />• Channcls that «�ill be vegctatcd shuuld be installed before major <br />c:uth�+�ork and hyJroscedcd u�ith a Bondcd Fiher Matrix. Thc <br />veeetatimi should bc well esiablished (i.c., 7j percent cover) before <br />uatcr is alio���cd ro Ilow in the ditch. \1'ith channcls that will ha�'c <br />I�i�h (lo���s, crosion control blankets should be installcd o��cr the <br />h� drosecd. If vegeta�ion cannot be cs�ahlishcd Gom sced before water <br />is allo���ed in ihe ditch, sod stiould be inst,illed in the bottom of the <br />Jiich ovcr hydromulch and blunkets. <br />• Kclentiun�dctcntion ponds should be seeded as rcyuired. <br />• hlulch is rcquircd at all timcs bccause it protccts sccds from hcat. <br />ntois�urc loss, und transport duc to runo(T. <br />• All diswrbed arcas shall be mvie��ed in late August to carly Scp�cmbcr <br />and all seeding should be completed by thc cnd of Scptcmber. <br />Othern•ise, vegetation �cill not cstablish itself cnough to provide more <br />Ihan accrage prolcction. <br />• At final sitc siabilization, all distunc�d arcas not uthenvisc vcgctatcd or <br />stabilizcd shall bc scedcd ;md mulchcd. Pin;il stabilizatim� mcans ihc <br />completion of all soil disturbing acli��i.ics at Ihc sitc :md thc <br />cstablishmcnt of a pcmiancnt �cgciali��c co��cr. or eyuivalcnt <br />pernianent s�abilizalion nte:�sures (such as pa�•ctnent, ripr.ip, gahions <br />or gcot��xtilcs) ���hich will prcecnt crosian. <br />Desi�;u nnd • Sccding should be done during those seasons most conducicc io <br />/nslallatinn gro�sih and will vary �vith �hc clim:uc conditions of thc rcgion. <br />Spccifi�•a�ious Local cspericncc should bc uscd to dctcmiinc the appropriatc <br />sccding periods. <br />. l'hc optinmm scrding �vindows li�r �ecs�cm 1�'ashing�on arc April I <br />Ihrough Junc 30 ;md Scptembcr I Ihrou�h Octobcr I. Sccding ihal <br />occurs bci��•ccn July I and August 30 will reyuirc irrigatinn until 7i <br />perccnt gr11ti51'O\'Cf IS l'SI:IIlI15i1C(I. SCC(IIII�` 1I18I OCl'llfti I)l'IR'l'l'1� <br />Octobcr 1 and March 30 will rcyuirc a mulch or plaslic co�'cr unlil <br />7$ perccnl grass cavcr is cstablishcd. <br />• To prevent seed from bcing ���asheJ away, conlinn Iha� all rcyuircd <br />surtacc «��tcr control mc:�tiums ha��c becn installed. <br />February 2005 Volume ll - Consl�uction Stomiwater Pollution Prevenfion 4•13 <br />