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Table 11-3.6: Mulch Standards and Guidelines (continued) <br /> Mulch Mater- Guideline Description <br /> ial <br /> This is a cost-effective way to dispose of debris from clearing and grub- <br /> bing, and it eliminates the problems associated with burning. Generally, it <br /> should not be used on slopes above approx. 10% because of its tendency <br /> to be transported by runoff. It is not recommended within 200 feet of sur- <br /> Remarks face waters. If permanent seeding or planting is expected shortly after <br /> mulch, the decomposition of the chipped vegetation may tie up nutrients <br /> important to grass establishment. <br /> Note:thick application of this material over existing grass, herbaceous spe- <br /> cies, and some groundcovers could smother and kill vegetation. <br /> Quality No visible water or dust during handling. Must be purchased from a supplier <br /> Standards with a Solid Waste Handling Permit or one exempt from solid waste reg- <br /> ulations. <br /> Application 2"thick min.; approx. 100 tons per acre(approx. 750 lbs. per cubic yard) <br /> Wood- Rates <br /> Based This material is often called"wood straw"or"hog fuel". The use of mulch <br /> Mulch ultimately improves the organic matter in the soil. Special caution is <br /> Remarks advised regarding the source and composition of wood-based mulches. Its <br /> preparation typically does not provide any weed seed control, so evidence <br /> of residual vegetation in its composition or known inclusion of weed plants <br /> or seeds should be monitored and prevented(or minimized). <br /> Quality A blend of loose, long, thin wood pieces derived from native conifer or <br /> Standards deciduous trees with high length-to-width ratio. <br /> Application 2"thick min. <br /> Rates <br /> Wood <br /> Strand Cost-effective protection when applied with adequate thickness.A min- <br /> Mulch imum of 95-percent of the wood strand shall have lengths between 2 and <br /> 10-inches,with a width and thickness between 1/16 and 1/2-inches.The <br /> Remarks mulch shall not contain resin, tannin, or other compounds in quantities that <br /> would be detrimental to plant life. Sawdust or wood shavings shall not be <br /> used as mulch. [Specification 9-14.4(4)from the Standard Specifications <br /> for Road, Bridge, and Municipal Construction(WSDOT, 2016) <br /> 2019 Stormwater Management Manual for Western Washington <br /> Volume 11-Chapter 3-Page 292 <br />