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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL 2. Any areas that experience erosion shall be re -mulched and/or protected with a net or blanket. If the erosion problem is drainage related, then the problem shall be fixed and the eroded area re - mulched. Table 3.7 Mulch Standards and Guidelines Mulch Application Material Quality Standards Rates Remarks Straw Air-dried; free from 2"-3" thick; Cost-effective protection when applied with adequate undesirable seed 5 bales per thickness. Hand -application generally requires greater and coarse material. 1,000 sf or thickness than blown straw. The thickness of straw may be 2-3 tons per reduced by half when used in conjunction with seeding. In acre. windy areas straw must be held in place by crimping, using a tackifier, or covering with netting. Blown straw always has to be held in place with a tackifier as even light winds will blow it away. Straw should be used only if mulches with long-term benefits are unavailable locally. It should also not be used within the ordinary high-water elevation of surface waters (due to flotation). Hydro- No growth inhibiting Approx. 25-30 Shall be applied with hydromulcher. Shall not be used mulch factors. Ibs per 1,000 without seed and tackifier unless the application rate is at sf or 1,500 — least doubled. Fibers longer than about 0.75 to 1-inch clog 2,000 Ibs per hydromulch equipment. Fibers should be kept to less than acre. 0.75 inch. Com- No visible water or 2" thick min.; More effective control can be obtained by increasing posted dust during approx. 100 thickness to 3 inches. Excellent mulch for protecting final Mulch and handling. tons per acre grades until landscaping because it can be directly seeded or Compost (approx. 800 tilled into soil as an amendment. Composted mulch has a (see note) Ibs per yard). coarser size gradation than compost. It is more stable and practical to use in wet areas and during rainy weather conditions. Chipped Average size shall 2" minimum This is a cost-effective way to dispose of debris from clearing Site be several inches. thickness. and grubbing, and it eliminates the problems associated with Vegetation Gradations from burning. Generally, it should not be used on slopes above fines to 6 inches in approx. 10 percent because of its tendency to be transported length for texture, by runoff. It is not recommended within 200 feet of surface variation, and waters. If seeding is expected shortly after mulch, the interlocking decomposition of the chipped vegetation may tie up nutrients properties. important to grass establishment. Wood- No visible water or 2" thick; This material is often called "hog or hogged fuel." It is usable Based dust during approx. 100 as a material for Stabilized Construction Entrances (BMP Mulch (see handling. tons per acre C105) and as a mulch. Special caution is advised regarding note) (approx. 800 the source and composition of wood -based mulches. Ibs/cubic yd). Note: these mulches must be purchased from a supplier with a Solid Waste mandiing Fermit (or one exempt from solid waste regulations) 3.2.9 BMP C122: Nets and Blankets Purpose Erosion control nets and blankets are intended to prevent erosion and hold seed and mulch in place on steep slopes and in channels so that vegetation can become well established. In addition, some nets and blankets can be used to permanently reinforce turf to protect drainage ways during high flows. Nets (commonly called matting) are strands of material woven into an open, but high -tensile strength net (for Volume 11— Construction Stormwater Pollution Prevention 3-15 7 11