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Mulch is nhvays rcyuircd for sceding. Mulch can bc applicd on tap of <br />the seed orsimultaneously hy hydroseeding. <br />On stecp slopcs, Bonded I�it:er Matrix (BFMI or Mcehanically Boi�dcd <br />Piber A4atrix (MEFD1) products should bc uscd. E3I�M/MBFM <br />productc arc applicd at a minimum ratc of 3,OUQ pounds per acrc of <br />mulch ���ith approsimately 10 perceni tackitier. Application is madc <br />so that a minimum af 95 percent soil co��cngc is achic�•cd. Numcmus <br />products xrc a��ailable commcrcially and should bc installcd per <br />manufacturer's inslructions. Most products requirc ?4-36 hours to <br />cure beforc a rainfall and c;mnot be instaRcd on wet c�r satur.ucd soils. <br />Generally, thes�: products cume in 40-if' pound bags and include all <br />necess�ry ingrcdicnts except for secd ai,d fertilizer. <br />HPMs and MBF11s have some ad�:mtages over blankets: <br />• No surface prep:�n�ion required; <br />• Can b� installcd via hclicoptcr in rcmotc arcas; <br />• On slopes stccper than 2.5:1, blankci ins�allcrs may nccd to hr ropcd <br />end harncssed for saCcty; <br />•"fhcy arc at Icast S I,000 per acrc chcaper installcd. <br />In most cases, the shcar streng!h of blankets is not a factor µ•hen used on <br />slopcs, only u•hcn used in channcis. BF�1s and MBIT1s are good <br />allematives to blankets in most siluations whcre vcgetatiou establishmcnt <br />is thc goal. <br />• \1'hcn installing sced via hydrosccding oper,uions, anly about 1/3 of <br />the secd acmaliq ends up in contact ��•ith the soil surface. This reduces <br />thc .ihility to establish a good st:md of gr.iss yuickly. Onc way to <br />m�ercome diis is W incrcasc secd quantities hy up to 50 percent. <br />• \'cgetation cstahlishment can also bc cnhanccd hy dividing the <br />h�dromulch oper.�tion into twu phascs: <br />I. Phasc I• Insrill all secd and 1'crtilir.cr ���ith 25-30 perccni mulch <br />and utckificr onto soil in thc tirs� lifl; <br />'_. Phasc 2- Install the rcst of thc mulch anJ tackificr ovcr thc first lifl. <br />An al�cmaii�•c is to inst:ill Ihc mulch, sced, Ccrtilir.cr. and tackificr in onc <br />lifl. '1'h�n, sprcad or bla�v str,nv ovcr �hc top of thc hydromulch at a ntc o( <br />ab�ut 500-1000 pounds per acrc. Hold sira�v in placc �vith a standard <br />����;�r��. u���i, ��r�i��s� ��n��aches will increasc cost roodcratcly but will <br />grc:��l}' improvc and cnh:mcc vcgctativc cs�ablishmcul. Thc incrc;iscd cost <br />may bc offsct by ihc mduccd nced for: <br />I. Irrigation <br />2. Kcapplication of midch <br />3. Rcpair oC failcd slopc surf;iccs <br />Fe6ruary 2005 Volume ll — Construcfion Sformwafer Pollution Prevention 4-15 <br />