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• <br /> or blanket. If the erosion problem is drainage related, then the problem shall be <br /> fixed and the eroded area remulched. <br /> Table 11-4.1,.8 Mulch Standards and Guidelines <br /> Mulch Quality Application <br /> Material Standards Rates Remarks <br /> Cost-effective protection when applied with <br /> adequate thickness. Hand-application generally <br /> requires greater thickness than blown straw. The <br /> thickness of straw may be reduced by half when <br /> used in conjunction with seeding. In windy areas <br /> Air-dried; „ straw must be held in place by crimping, using a <br /> free from 2 -3 thick; tackifier, or covering with netting. Blown straw <br /> 5 bales per <br /> Straw undesirable 1,000 sf or always has to be held in place with a tackifier as <br /> seed and even light winds will blow it away. Straw, how- <br /> coarse <br /> l- tons per <br /> coarse ever, has several deficiencies that should be con- <br /> material. acre sidered when selecting mulch materials. It often <br /> introduces and/or encourages the propagation of <br /> weed species and it has no significant long-term <br /> benefits It should also not be used within the <br /> ordinary high-water elevation of surface waters <br /> _ (due to flotation). <br /> Approx. 25- Shall be applied with hydromulcher. Shall not be <br /> No growth 30 Ibs per used without seed and tackifier unless the applic- <br /> Hydromulch inhibiting 1,00� sf or ation rate is at least doubled. Fibers longer than <br /> factors. '503 about 3/4 - 1 inch clog hydromulch equipment. <br /> 1 I <br /> ,000 bs Fibers should be kept to less than 3/4 inch. <br /> per acre <br /> No visible <br /> water or More effective control can be obtained by increas- <br /> dust during ing thickness to 3". Excellent mulch for protecting <br /> handling. 2" thick final grades until landscaping because it can be <br /> Must be pro-min.; directly seeded or tilled into soil as an amend- <br /> duced per approx. 100 ment. Compost used for mulch has a coarser size <br /> Compost WAC 173- tons per gradation than compost used for BMP C125: Top- <br /> 350, Solid acre soiling / Composting (p.297)or BMP T5.13: Post- <br /> Waste (approx. Construction Soil Quality and Depth (p.911). It is <br /> Handling 800 lbs per more stable and practical to use in wet areas and <br /> Standards, yard) during rainy weather conditions. Do not use near <br /> but may wetlands or near phosphorous impaired water <br /> have up to bodies. <br /> 35% <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume II- Chapter 4 -Page 286 <br />