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Design and • Scc Figurc �t.d �nd Figurc 4.5 for typical orienta�ion :uid installation ot� <br />/ns►alla�iou blankets used in channcls and as slopc protection. Notc: �hese arc <br />Specifrratinns typical only; all blankcts must be installcd per manuf:xturer's <br />installation instructians. <br />. Installation is critic;�l to lhe e(Teclivencss of �hese products. If good <br />ground comact is not achie��cd, nmoR'can concenirate under �he <br />product, resulting in significant crosion. <br />• Installation of F3lankcts on Slopcs: <br />I. Complctc final gradc and track �ealk up and down thc slopc. <br />2. Install hydrontulch aith seed and fenilizer. <br />3. Dig a smail trench, approximately 12 inches ���ide hy fi inrhes deep <br />alon;; thc top of the slopc. <br />4. Install ihc Icading cdgc of thc blunk�t into thc small :rench and <br />staplc approximately c�•cry I R inches. NOTE: Staples are <br />mctal;'U"-shaped, and .i minimum of 6 inchcs long. Longcr <br />sd+ples are uscd in sandy soils. F3iodcgradable stakes are alsn <br />available. <br />5. Roll the blanket slowly down the slope as installer u�alks <br />hackwards. NOTI:: Thc blankc[ rests agains� thc installer's Icgs. <br />Staples arc installed as the blanket is unrolled. It is critical that thc <br />proper staplc pattcrn is used fur thc blankct bcing installcd. Thc <br />blankct is not to bc allo�a'ed to rall down thc slopc on its o�tn as <br />ihis suctchcs thc blanket making it impossiblc to maintain soil <br />contacl. In additiun, no one is alloucd to walk on thc blankzt �flcr <br />it is in placc. <br />6. If thc blankct is not long cnough to covcr thc cntire slopc Icngth. <br />thc trailing cdgc of �hc upper blankct shuuld occrlap �he Icading <br />�ds� �r�n� i������ niankct and be stapled. On steeper slopes, ihis <br />overlap should be inst:dled in a small trench, siapled, anJ covered <br />with soil. <br />1Vith thc varicty of products avail�hlc, it is impossiblc to cm�cr all thc <br />details oCappropriatc usc:md installation. Thcrcforc, i� is critical that <br />thc design cnginccr consuhs thc manufacttircr's infortnation and that a <br />,ilc visi� uikcs placc in ordcr to insurc thal thc produci spccified is <br />appropriata Infornialion is also availablc ai ihc following �ecb sitcs: <br />l. 1VSDOT: h�://ww�v.wsdot.��:�.�o��/ecsc/cnvironmcn�al/ <br />2. 'I'cxas Transportation Institufc: <br />hitn://www.doi.st.ite.h.us/insdtdoUorechan/cmd/erosion/contems. <br />hun <br />February 2005 Volume 11— Consfrucfion Sformwater Pollution Prevenfion 4-2� <br />