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Table 11-4.1.8 Mulch Standards and Guidelines (continued) <br /> Mulch Quality Application <br /> Material Standards Rates Remarks <br /> biosolids. <br /> Average <br /> size shall This is a cost-effective way to dispose of debris <br /> be several from clearing and grubbing, and it eliminates the <br /> inches. problems associated with burning. Generally, it <br /> Chipped Gradations should not be used on slopes above approx. 10% <br /> Site Veget- from fines 2" thick because of its tendency to be transported by run- <br /> to 6 inches min.,• off. It is not recommended within 200 feet of sur- <br /> ation in length for face waters. If seeding is expected shortly after <br /> texture, vari- mulch, the decomposition of the chipped veget- <br /> ation, and ation may tie up nutrients important to grass estab- <br /> interlocking lishment. <br /> properties. _ <br /> No visible <br /> water or <br /> dust during <br /> handling. <br /> Must be pur-2" thick This material is often called "hog or hogged fuel". <br /> The use of mulch ultimately improves the organic <br /> Wood- chased min.; matter in the soil. Special caution is advised <br /> based from a sup- approx. 100 regarding the source and composition of wood- <br /> Mulch or wood- <br /> plier with a torts per based mulches. Its preparation typically does not <br /> Wood Solid acre provide any weed seed control, so evidence of <br /> Waste (approx. <br /> Straw Handling 800 lbs. per residual vegetation in its composition or known <br /> inclusion of weed plants or seeds should be mon- <br /> Permit or cubic yard) itored and prevented (or minimized). <br /> one exempt <br /> from solid <br /> waste reg- <br /> ulations. <br /> A blend of Cost-effective protection when applied with <br /> loose, long, adequate thickness. A minimum of 95-percent of <br /> thin wood the wood strand shall have lengths between 2 <br /> Wood pieces and 10-inches, with a width and thickness <br /> Strand derived 2" thick min. between 1/16 and 3/8-inches. The mulch shall not <br /> Mulch from native contain resin, tannin, or other compounds in <br /> conifer or quantities that would be detrimental to plant life. <br /> deciduous Sawdust or wood shavings shall not be used as <br /> trees with mulch. (WSDOT specification (9-14.4(4)) <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume ll- Chapter 4 -Page 287 <br />