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~, UNITED STATES DEPARTMENT OF AGRICULTURE <br />• Sofl Conservation Service <br />Colorado <br />Standard and Specifications <br />CRITICAL AREA PLANTING <br />(Code 342) <br />Standard <br />Definition <br />Tech. Guide <br />Section IV <br />.ianuary, 1973 <br />Planting vegetation such as trees, shrubs, vines, grasses, or legumes <br />on critical areas. (Does not include tree planting mainly for wood products.) <br />Rirpose <br />• To stabilize the soil; reduce damage from sediment and runoff to downstream <br />areas; improve wildlife habitat.; and enhance natural beauty. <br />Where applicable <br />On sediment-producing, highly erodible or severely eroded areas, such as <br />dams, dikes, mine spoil, levees, cuts, fills, surface-mined areas, and <br />• denuded or gullied areas where vegetation is difficult to establish with <br />usual seeding or planting methods. <br />Specifications {Grasses h Legumesl <br />1. For critical area plantings in urban areas, see Standards & Specifications <br />for Critical Area Planting, Supplement No. 1, entitled "Planting Perennial <br />Grasses and Legumes for Special Soil and Water Conservation Purposes". it <br />was prepared primarily for Commercial/Industrial, Commercial Services, <br />• Recreation, Residential and Transportation Services land uses. <br />2. Construction > <br />A. Critical areas should not have slopes greater than 3; 1. Slopes of_ <br />6:1 of less are much more eaira e. In general, tTie 'cfiances for <br />vegetation establishment increase as percent slope decreases. <br />R. Excess water from adjacent areas should not be allowed to flow onto <br />the critical area. <br />C. Length of slope should be properly controlled with diversions. They <br />will be constructed in accordance with Standards & Specifications <br />for "Diversions". <br /> 3. Seedbed prep aration <br /> See Standard & Specifications for "Seedbed Preparation". <br />.,...,...ro,,.......... ~.,. Page 1 of 4 <br />