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