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Table II-3.6: Mulch Standards and Guidelines Mulch Mater- Guideline Description ial Quality Air-dried;free from undesirable seed and coarse material. Standards Application 2"-3"thick; 5 bales per 1,000 sf or 2-3 tons per acre Rates Cost-effective protection when applied with adequate thickness. Hand- application generally requires greater thickness than blown straw. The Straw thickness of straw may be reduced by half when used in conjunction with seeding. In 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 Remarks place with a tackifier as even light winds will blow it away. Straw, however, has several deficiencies that should be considered when selecting mulch materials. It often introduces and/or encourages the propagation of weed species and it has no significant long-term benefits It should also not be used within the ordinary high-water elevation of surface waters(due to flot- ation). Quality No growth inhibiting factors. Standards Application Approx. 35-45lbs per 1,000 sf or 1,500-2,000 lbs per acre Hydromulch Rates Shall be applied with hydromulcher. Shall not be used without seed and Remarks tackifier unless the application rate is at least doubled. Fibers longer than about 3/4-1 inch clog hydromulch equipment. Fibers should be kept to less than 3/4 inch. Quality No visible water or dust during handling. Must be produced per WAC 173- Standards 350, Solid Waste Handling Standards, but may have up to 35% biosolids. Application 2"thick min.; approx. 100 tons per acre(approx. 750 Ibs per cubic yard) Rates More effective control can be obtained by increasing thickness to 3". Excel- Compost lent mulch for protecting final grades until landscaping because it can be dir- ectly seeded or tilled into soil as an amendment. Compost used for mulch Remarks has a coarser size gradation than compost used for BMP C125:Topsoiling /Composting or BMP T5.13: Post-Construction Soil Quality and Depth. It is more stable and practical to use in wet areas and during rainy weather conditions. Do not use near wetlands or near phosphorous impaired water bodies. Quality Gradations from fines to 6 inches in length for texture, variation, and inter- Chipped Standards locking properties. Include a mix of various sizes so that the average size Site Veget- is between 2-and 4-inches. ation Application 2"thick min.; Rates 2019 Stormwater Management Manual for Western Washington Volume 11-Chapter 3-Page 291