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Erosion Control Practices Reducing the duration of time that the ground surface is disturbed is the easiest way to reduce erosion. Disturbed ground that has been covered with straw, mulch, or erosion matting is less susceptible to soil loss than bare soil. Straw and matting protect the soil from rain and wind and subsequent erosion. Basic erosion control principles to minimize erosion include: • Plan the construction access to follow the sites topography; • Sequence and plan work activities to minimize the extend and duration of bare soils, • Use appropriate BMPs to stabilize disturbed areas quickly; and • Us e BMPs to reduce the speed of water flowing through the area. Specific Erosion Control BMPs include the following: Permanent and Temporary Restoration (T-OHD-MSC-020.000) • Temporary seeding can be used to stabilize disturbed areas if permanent restoration will be delayed.In lieu of temporary seeding, other surface protection methods can be used (T-OHD-MSC-021.000). • All disturbed areas must be restored with vegetative cover.One of the ATC Seed Mixes should be used if appropriate to the surrounding area. SURFACE PROTECTION (T-OHD-MSC-021.000) • Temporary protection, such as polyacrylimide (PAM), woodchips, or mulch may be used in upland areas if permanent restoration is delayed more than 30 days. • Straw mulch should be used in conjunction with seeding in upland areas. • Temporary surface protection should be used in the winter. TT • Surface protection should not be used in ditches and channels.Use applicable erosion mats (T-OHD-MSC-023.000). • Polymers should not be applied within 30 feet of wetlands, waterways, or other sensitive areas, woodchips or mulch should be used as a temporary working surface in such areas. EROSION MAT—SLOPES AND CHANNELS (T-OHD-MSC-022.000 and T-OHD-MSC-023.0001 • When permanent restoration is required adjacent to roadways, an erosion mat should be used along with seeding, rather than straw mulch that may be blown away by nearby traffic. • An erosion mat can serve as temporary restoration in the winter until permanent restoration can occur in the spring. • Erosion mats should be used on steep slopes or long, continuously draining slopes where mulch could be washed away, and in the summer months when higher intensity rains are most likely to occur. • The mat specifications should be consulted to determine if it is suitable for use in channel. ENV EF 27 See on-line version for current revisions. Page 6 of 8 Revision Date: 06/22/09