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I <br /> ITable 4.7 <br /> Mulch Standards and Guidelines <br /> I Mulch Application _�__ <br /> Material Quality Standards Rates Remarks <br /> Straw Air-dried;free from 2"-3"thick;5 Cost-effective protection when applied with adequate <br /> I undesirable seed and bales per 1000 sf thickness. Hand-application generally requires greater <br /> coarse material. or 2-3 tons per thickness than blown straw.The thickness of straw may be <br /> acre reduced by half when used in conjunction with seeding. In <br /> windy areas straw must be held in place by crimping,using a <br /> I tackifier,or covering with netting. Blown straw always has <br /> to be held in place with a tackifier as even light winds will <br /> blow it away.Straw,however,has several deficiencies that <br /> should be considered when selecting mulch materials.It <br /> I <br /> often introduces and/or encourages the propagation of weed <br /> species and it has no significant long-term benefits. Straw <br /> should be used only if mulches with long-term benefits are <br /> I unavailable locally. It should also not be used within the <br /> ordinary high-water elevation of surface waters(due to <br /> flotation). <br /> Hydromulch No growth Approx.25-30 Shall be applied with hydromuicher. Shall not be used <br /> I <br /> inhibiting factors. lbs per 1000 sf without seed and tackifier unless the application rate is at <br /> or 1500 -2000 least doubled. Fibers longer than about 3A-1 inch clog <br /> lbs per acre hydromulch equipment. Fibers should be kept to less than 3 <br /> I inch. <br /> Composted No visible water or 2"thick min.; More effective control can be obtained by increasing <br /> Mulch and dust during approx. 100 tons thickness to 3". Excellent mulch for protecting final grades <br /> I Compost handling. Must be per acre(approx. until landscaping because it can be directly seeded or tilled <br /> purchased from 800 lbs per yard) into soil as an amendment. Composted mulch has a coarser <br /> supplier with Solid size gradation than compost.It is more stable and practical <br /> Waste Handling to use in wet areas and during rainy weather conditions. <br /> I Permit(unless <br /> exempt). <br /> Chipped Site Average size shall 2"minimum This is a cost-effective way to dispose of debris from <br /> I Vegetation be several inches.Gradations from thickness clearing and grubbing,and it eliminates the problems <br /> associated with burning. Generally,it should not be used on <br /> fines to 6 inches in slopes above approx. 10%because of its tendency to be <br /> length for texture, transported by runoff. It is not recommended within 200 <br /> I variation,and feet of surface waters. If seeding is expected shortly after <br /> interlocking mulch,the decomposition of the chipped vegetation may tie <br /> properties. up nutrients important to grass establishment. <br /> I Wood-based No visible water or 2"thick;approx. This material is often called"hog or hogged fuel." It is <br /> Mulch dust during 100 tons per acre usable as a material for Stabilized Construction Entrances <br /> handling. Must be (approx.800 lbs. (BMP C105)and as a mulch. The use of mulch ultimately <br /> purchased from a per cubic yard) improves the organic matter in the soil. Special caution is <br /> I <br /> supplier with a Solid advised regarding the source and composition of wood- <br /> Waste Handling based mulches. Its preparation typically does not provide <br /> Permit or one any weed seed control,so evidence of residual vegetation in <br /> I <br /> exempt from solid waste regulations. its composition or known inclusion of weed plants or seeds <br /> should be monitored and prevented(or minimized). <br /> I <br /> I <br /> IFebruary 2005 Volume II—Construction Stormwater Pollution Prevention 4-21 <br />