3000 SR 529 2016-01-01 MF Import

. Jutc mattin5 must bc uscd in conjunction with nwlch (H11P C121). Excclsior, �eoacn stra��• blankets and coir (coconut fibcr) blankets may be installed without mulch. Thcrc are many other types of crosion coNrol nets and blankets on the market ihat may be appropriate in ccrtain circumstanccs. . In gcnenl, most ects (c.g., iute mattine) requirc mulch in or�!cr to prevent erosion because ihcy haee a fairly opcn struaure. Blankcts t}7>ically do not rcquire mulch bccausc thcy usually providc complctc protcction o(thc surface. • I:�trcmcly srecp, unstablc, wct, or rocky slopcs arc oficn appropri�ic candidates for use nf synthetic hlankets, as arc riverbanks, beaches and othcr high-cnergy� cnvironnrents. If synth�tic blankcts arc uscd, thc soil should bc hqdromulched first. • 100 percenl bioJegndable blankets are available for use in sensitivc arcas. Thcsc oreanic blankcts are usually held togcthcr �aith .� paper or fibcr mesh and stitching which may last up to a ycar. . �1ost netting used «•ith blankcts is phowdcgradable, meaning they, break do�+�n under sunlight (not UV slabilized). Ho��rcer, this proccss can takc months or years eeen under bright sun. Once vegetation is established, sunlight daes not reach the mesh. It is not uncommon to find non•dcgraded nettinc still in place scveml ycars afier insiallation. This can be a prohlem if maintenance requires the use of mo�cers or ditch clr�ning cquipmcnt. In addition, birds and small animals can hecome tnppcd in thc nctting. �11ain�rnanrc • Good contact «iih thc ground must hc m:iintaincJ, and crosian must Smndard,s not occ�r bcnr.rth thc ncl or blankct. . Any areas of the net or hlanket that arc damaged or not in close contact �� ith thc ground sh.dl bc rcpaircd cu�J staplcd. • If crosion occurs duc to poorly controllcd drainagc, thc problcro sh;ill bc fi�ed and thc crodcd arc;� protcctcd. 4-24 Volume ll - ConsWction Sformwafe� Pollution Prevenfion February 2005