Appendix F Detailed Cover Type Tables - USDA Rural Development

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Bemidji – Grand Rapids Biological Assessment and Evaluation • New construction access paths, temporary roads, and material storage areas should avoid occurrences of NNIS or crossing areas infested with NNIS. • Prior to exposing bare mineral soil, the NNIS occurrence within the right‐of‐way should be treated by mechanical means such as mowing or hand pulling to minimize the seed production while the soil is exposed. • Minimize the spread of NNIS by using clean granual fill or clean gravel sources (per MnDOT Specification 3138.2 A1 Aggregate Composition) for backfill material. No organic fill will be imported to the site. • Within the CNF and LLR, seed mixes will be developed in conjunction with and approved by DRM and CNF. • The following seed mixes, which were developed by the Minnesota Board of Soil and Water Resources for restoration purposes, are recommended for re‐vegetation within the cleared corridor outside of the CNF and LLR: o o o Upland Sand/Gravel area seed mixes: BWSR U7 (Native Savanna and Woodland Edge), BWSR U1 (Native NW MN Mesic Tall‐Grass Prairie), MnDOT 350NGR (Native General Roadside Mix) or MnDOT 340NSM (Native Sandy Mid‐Height Mix). Upland Loam/Silt/Clay soil area seed mixes: BWSR U14 (DNR NE MN Trail ROW – Forest Edge Mix Wetland seed mixes: BWSR W1 (Native Emergent/Wetland Fringe), BWSR W2 (Native Sedge/Wet Meadow), BWSR W3 (Native Wet Prairie • Newly seeded areas will be inspected for weed establishment three times during the first growing season. If present, weeds will be controlled (mechanically or via herbicide – with landowner approval) to minimize weed seed production. 8.5 Wetlands Transmission line construction in wetlands will consist of clearing of trees, constructing H‐frame structures near final pole locations, augering of holes, dewatering, backfilling, cleanup, and revegetation. However, due to the unstable nature of some wetland soils, construction activities may differ somewhat from those described for typical upland areas. Construction activities will be minimized in wetlands and/or special construction techniques will be used to minimize the disturbance to plants and soils and to protect wetland hydrology. • Winter construction over frozen surfaces sufficient to support the weight of all construction equipment or the use of construction timber mats is required for all construction activities in wetlands with peat soils, muck soils or open water • Staging areas and, temporary excavated soil storage areas, will typically be located in upland areas at least 50‐feet away from wetland boundaries where topographic conditions permit. If topographic conditions do not permit a 50‐foot setback, then these areas will be located as far away from the wetland as is practicable. Vegetation will not be cleared between these areas and the wetland in any event. Trees within wetlands will be cut off at ground level, leaving existing root systems intact; clearing debris will generally be removed from the wetland for disposal. Chips, hydro‐axe debris, or similar can be left in the wetland if spread evenly in the right‐of‐way up to a depth not to exceed 1 inch in thickness and in a manner which will allow for normal revegetation. July 2010 Mitigation Measures Page 8‐4
Bemidji – Grand Rapids Biological Assessment and Evaluation • Use vehicle construction mats to support equipment used during construction in wetlands to minimize wetland soil compaction • Locate structures and new roads to avoid wetlands and buffers. • Mechanized clearing within wetlands will only be conducted when necessary. • Limit disturbance to the minimum necessary when working in and immediately adjacent to wetlands. • Delineate wetlands before final design and post clear signage for contractor avoidance during construction. • Use erosion control measures when conducting any earth disturbance upslope of wetlands to ensure soil is not washed downhill during storms. • Ensure noxious weed infestations do not become a problem in wetlands by cleaning (via washing or using compressed air) all construction vehicles prior to entering any new wetland location. (Applicable to summer construction only.) • The ROW will be the main traffic road for the heavy construction equipment, and frost/ice road construction must focus on adequately building this area prior to all construction activities at any given site. • Low ground pressure equipment (wide tires or tracked vehicles) and/or construction mats will be used during any non‐winter operations, minimizing disturbance to wetlands. • Tree stumps, brush riprap, imported soil, and rock fill will not be brought in to stabilize the rightof‐way in wetlands. Where a wetland cannot support construction equipment, and low‐groundweight equipment is not used, construction activities will be accomplished from timber or other types of construction mats. • The contractor is responsible for having a sufficient number of construction mats to perform the work. Timber riprap (also known as or corduroy road) cannot be used without prior written approval from the company and the appropriate regulatory agencies. • Pre‐existing corduroy roads in wetlands may be used but, may not be improved, maintained, restored, or replaced without site‐specific authorization from applicable agencies. • All construction mats, construction debris, and larger vegetative debris will be removed during cleanup of wetlands. • If the wetland right‐of‐way is stable (dry work area or construction mats), structures may be constructed and set in place as in upland areas. Supplemental equipment supports, such as construction mats, will be used in wetlands to provide temporary portable support for heavy construction equipment to reduce ground pressure and minimize soil compaction and/or soil mixing. July 2010 Mitigation Measures Page 8‐5
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Appendix F Detailed Cover Type Tables - USDA Rural Development

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