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1 <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 <br />Quality <br />Application <br />Remarks <br />Material <br />Standards <br />Rates <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; <br />„- <br />2 3„ thick; <br />straw must be held in place by crimping, using a <br />free from <br />5 bales per <br />tackifier, or covering with netting. Blown straw <br />Straw <br />undesirable <br />1,000 sf or <br />always has to be held in place with a tackifier as <br />seed and <br />2-3 tons per <br />even light winds will blow it away. Straw, how - <br />coarse <br />ever, has several deficiencies that should be con - <br />material. <br />acr <br />acre <br />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- <br />Shall be applied with hydromulcher. Shall not be <br />No growth <br />30 Ibs per <br />1,000 sf or <br />used without seed and tackifier unless the applic- <br />Hydromulch <br />inhibiting <br />11500 - <br />ation rate is at least doubled. Fibers longer than <br />factors. <br />2,000 Ibs <br />about 3/4 - 1 inch clog hydromulch equipment. <br />Fibers should be kept to less than 3/4 inch. <br />per acre <br />No visible <br />water or <br />More effective control can be obtained by increas- <br />dust during <br />ing thickness to 3". Excellent mulch for protecting <br />handling. <br />2" thick <br />final grades until landscaping because it can be <br />Must be pro <br />in.; <br />directly seeded or tilled into soil as an amend- <br />duced per <br />approx. 100 <br />ment. Compost used for mulch has a coarser size <br />Compost <br />WAC 173- <br />tons per <br />gradation than compost used for BMP C125: Top- <br />350, Solid <br />acre <br />soiling / Composting (p.297) or BMP T5.13: Post - <br />Waste <br />(approx. <br />Construction Soil Quality and Depth (p.911). It is <br />Handling <br />800 Ibs per <br />more stable and practical to use in wet areas and <br />Standards, <br />yard) <br />during rainy weather conditions. Do not use near <br />but may <br />wetlands or near phosphorous impaired water <br />have up to <br />bodies. <br />35% <br />2414 Stormwater Management Manual for Westem Washington <br />Volume 11 - Chapter 4 - Page 286 <br />1 <br />1 <br />1 <br />F� <br />it <br />1 <br />Ll <br />r- <br />I� <br />1 <br />1 <br />1 <br />1 <br />1 <br />