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CITY OF EVERETT STOfLNWATER MANAGEMENT MANUAL <br /> 2. Any areas that experience erosion shall be re-mulched and/or protected with a net or blanket. (f <br /> the erosion problem is drainagc related, then the problem shall be fixed and the eroded area rc- <br /> mulched. <br /> Table 3.7 Muleh S!andards and Guidelines <br /> Mulch Appiieation <br /> Materlal DualitySWndards Rates Ramarks <br /> Straw Air-dried; frer, From 2°-3"thick; Cost-eftective prolection when applied with adequate <br /> undesireble seed 5 bales per thickness. Handapplication generatly requires greater <br /> and coarse material. 1,000 sf or thickness than blown straw.The thickness of slraw may be <br /> 2-3 tons per reduced by hal(when used in conjunction with seeding. In <br /> acre. windy areas straw must be held in place by cdmping,using a <br /> lackifier,or covenng with netting. Blown sVaw always has to <br /> be held in place with a lackifier as even light winds wiil blow it <br /> away. SUaw should be used only if mulches with long-term <br /> benefits are unavailable locally. Il should also not be used <br /> within the ordinary high-water elevation o(surface waters <br /> (due to flotation). <br /> Hydro• No growth inhibiting Approx. 2530 Shall be applied with hydromulcher. Shall not be used <br /> mulch factors. Ibs per 1,000 without seed and tackifier unless the application rate is at <br /> sf or 1,500— least doublad. Fibers longer than about 0.75 to 1-inch clog <br /> 2,000 Ibs per hydromulch equipment. Fiters should be kept to less than <br /> acre. 0.75 inch. <br /> Com- No visible water or 2'thick min.; More eHective a-.rol can be obtained by increasing <br /> posled dusl during approx. 100 thickness to 3 inches. Excellent mulch for protecting final <br /> Mulch and handling. tons per acre grades until landscaping becauce il can be direclly seeded or <br /> Composl (approx.800 tilled into soil as an amendmenl. Composted mulch has a <br /> (see note) Ibs per yard), coarser size gradation than composl. It is more stable and <br /> practicat to use in wet areas and during rainy weather <br /> conditians. <br /> Chipped Average size shall 2"minimum This is a cost�effective way to dispose of debds fram clearing <br /> Site be several inches. fhickness. and grubbing,and it eliminates the problems associated with <br /> Vegetation Gradations From burning. Generally,it shoutd not be used on siopes above <br /> fines to 6 inches in approx. 10 per�ent because of its tendency to be Iransported <br /> lenglh for texture, by runoff. It is not recommended within 200 feet of surface <br /> variation, and waters. If seeding is expected shortly afler mulch,the <br /> interlocking decomposition r„the chipped vegetation may tia up nulrients <br /> properties. important to grass establishment. <br /> Wood- No visible waler or 2"lhick; This malerial is oRen called°hog or hogged(uel.' Il is usable <br /> Based dust during approx. 100 as a material for S'abilized Construction E�trances(BMP <br /> Mulch(see handling. tons per acre C105)and as a mulch. Special caulion is advised regarding <br /> noie) (approx.800 the source and composition oi wood-based mulches. <br /> Ibslcubic yd). <br /> iJote: these mulches must be purchased from a supplier with a Solid Waste Iiandling Pcrout!or one cxempt Gom <br /> solid w�ste regulations) <br /> 3.2.9 BMP C122; Nets and Blankets <br /> Purpose <br /> Erosion conhol nets and blankels are intended to prevent erosion and hold seed and mulch in place on <br /> steep slopes and in channcls so that vegetetion can become well established. In addition,some nets and <br /> blankets can be used to permanenAy reiuforce wrf to protcct drainage ways during high flows. Nets <br /> (commonly callcd matting)aze shands of matenal wocen into an open,but high•tcnsilc strength ncl((or <br /> Volume ll—Construction SformwaterPolfution Preven!ion <br /> 3-15 <br />