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1 <br /> BMP C124: Sodding <br /> Purpose The purpose of sodding is to establish permanent turf for immediate <br /> erosion protection and to stabilize drainage ways where concentrated <br /> overland flow will occur. <br /> Conditions of Use Sodding may be used in the following areas: <br /> • Disturbed areas that require short-term or long-term cover. <br /> • Disturbed areas that require immediate vegetative cover. <br /> • All waterways that require vegetative lining. Waterways may also be <br /> seeded rather than sodded, and protected with a net or blanket. <br /> Design and Sod shall be free of weeds, of uniform thickness (approximately 1-inch <br /> Installation thick), and shall have a dense root mat for mechanical strength. <br /> Specifications <br /> The following steps are recommended for sod installation: <br /> • Shape and smooth the surface to final grade in accordance with the <br /> approved grading plan. The swale needs to be overexcavated 4 to 6 <br /> inches below design elevation to allow room for placing soil <br /> amendment and sod. <br /> • Amend 4 inches (minimum) of compost into the top 8 inches of the <br /> soil if the organic content of the soil is less than ten percent or the <br /> permeability is less than 0.6 inches per hour. Compost used should <br /> meet Ecology publication 94-038 specifications for Grade A quality <br /> compost. <br /> • Fertilize according to the supplier's recommendations. <br /> • Work lime and fertilizer 1 to 2 inches into the soil, and smooth the <br /> surface. <br /> • Lay strips of sod beginning at the lowest area to be sodded and <br /> perpendicular to the direction of water flow. Wedge strips securely <br /> into place. Square the ends of each strip to provide for a close, tight <br /> fit. Stagger joints at least 12 inches. Staple on slopes steeper than <br /> 3H:1V. Staple the upstream edge of each sod strip. <br /> • Roll the sodded area and irrigate. <br /> I . When sodding is carried out in alternating strips or other patterns, seed <br /> the areas between the sod immediately after sodding. <br /> Maintenance If the grass is unhealthy, the cause shall be determined and appropriate <br /> I Standards action taken to reestablish a healthy groundcover. If it is impossible to <br /> establish a healthy groundcover due to frequent saturation, instability, or <br /> some other cause, the sod shall be removed, the area seeded with an <br /> appropriate mix, and protected with a net or blanket. <br /> I <br /> 4-28 Volume II— Construction Stormwater Pollution Prevention February 2005 <br />