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.- 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 accepta.ble 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: ... Manage 2 Slightly Susceptible Less stringent protection than Manage 1 wetlands;maintenance of characteristics is desirable ... The following are the required buffer area widths for each protection classification: Width of Protection Buffer Additional Protection Requirements Classification �'ea (B =Bounce= Change in water level due to runoff from event) Wetland (P=Phosphorus) Boundary B: Maintain bounce at or below existing "Manage 2" 25 feet conditions plus 1.0 foot P: Limit concentration to predevelopment concentrations (d) In cases of new development or redevelopment the city shall require that vegetation in the wetland buffer be installed prior to the issuance of the certificate of occupancy. The city may waive this requirement in lieu of a cash escrow or letter of credit equal to 150 percent of the cost to install the required buffer. (e) The city may allow the disturbance of an existing buffer area during the course of construction activity. This disturbance must be kept to a minimum, soils must be decompacted to a level that will accommodate root growth, and the buffer area must be re-established as required by the city. The city will determine the amount of allowable disturbance. The city may require a cash escrow or letter of credit equal to 150 percent of the cost to re-establish the buffer to its original condition.