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November 16, 2011 85 Old Crystal Bay Road S Page 5 of 6 (2) Unacceptable buffer areas have the following qualities, including but not limited to: a. Undesirable plant species (including but not limited to reed canary grass, common buckthorn, purple loosestrife, leafy spurge and noxious weeds), or b. Lacking a layer of organic thatch or duff, or c. Topography which tends to channelize the flow of surface runoff, or d. Is characteristically unlikely to retain nutrients and sediment. (3) Buffer areas which have been broken or cultivated within the past ten consecutive years must be restored to a condition consistent with an acceptable buffer area defined in section 78-1605(b)(1), a restoration or landscape plan must be submitted to the planning director, which restoration shall include, replanting and maintaining according to each of the following guidelines: a. Buffer areas shall be planted with a seed mix containing 100 percent perennial native plant species, except for a one-time planting of an annual nurse or cover crop such as oats or rye. b. The seed mix to be used shall consist of at least 12 pounds pure live seed (PLS) per acre of native prairie grass seed and five pounds PLS per acre of native forbs. Native prairie grass and native forb mixes shall contain no fewer than four and five species respectively. c. The annual nurse or cover crop shall be applied at a rate of 20 pounds per acre. d. Native shrubs and or trees may be used in addition to forbs and grasses. Shrubs shall be distributed so as to provide a natural appearance and shall not be planted in rows. e. Native prairie grasses and forbs shall be planted by a qualified contractor. f. No fertilizer shall be used in establishing new buffer zones, except on highly disturbed sites when deemed necessary to establish acceptable buffer vegetation and then limited to amounts indicated by an accredited soil testing laboratory. g. All seeded areas shall be mulched immediately with clean straw at a rate of one and one-half tons per acre. Mulch shall be anchored with a disk or tackifier. h. Buffer areas (both natural and created), shall be protected by silt fence during construction and the fence shall remain in place until the area crop is established, and at that time the fence shall be removed. (c) Buffer area widths will be based on the wetland protection strategies established in the Orono Surface Water Management Plan (SWMP) (December 2002). A protection classification has been assigned to each wetland in Orono based on the stormwater susceptibility and functional assessment for each wetland. The four protection classifications are described as follows: Protection Susceptibility Rating Description Classification "Preserve" Highly Susceptible Highly susceptible to both quantity and quality impacts from runoff; have the highest degree of protection "Manage 1" Moderately Moderately susceptible to quantity and quality impacts; Susceptible protection is less stringent than Preserve, provides protection to maintain their characteristics "Manage 2" Slightly Susceptible Less stringent protection than Manage 1 wetlands; maintenance of characteristics is desirable "Manage 3" Least Susceptible Wetlands are significantly degraded (e.g., cultivated or canary grass monotype) or lack of wetland characteristics; not typically impacted by runoff; no quantity and only limited quality treatment of runoff is required The protection classification for each wetland will be found on the "Wetland Management Classification Map & List" which is hereby adopted by reference, a copy of which shall be kept on file in the office of the city clerk and shall be available for public review during all normal office hours. The following are the required buffer area widths for each protection classification: