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The two sub-areas designated for wetlsnd creation will be overexcavated below finish grade to a <br /> minimum depth of 12 inches. During wetlands creation, stockpiled wedand soils will be used to <br /> provide a planting medium containing native seed and root sources, organic matter and nutrients and <br /> optimum water-holding capabiliaes. A minimum of 12 inches of wedand soils will be replaced to <br /> meet final grade in the wedand creaaon uea. Any additional organic soil, required to meet specified <br /> grade in the midgaaon azea, is subject to approvai by the project biologist and is to contain a <br /> minimum of 30 percent peat and balance is to be mineral soil with a maximum of 10 percent gravel <br /> no larger than that passing through a 3/8 inch screen. The final grade will be established by hand- <br /> raking to level low azeas and equipment tracks. <br /> 3.3.4 Establishment of Hydrologic Regime <br /> Using contracror-supplied construction survey equipment, the project biologist will verify stalcing of <br /> the planting zones. <br /> The tota10.6 acre surface uea contributing surface and subsurface ranoff to Weflands D and E will <br /> not change substanaally from the exis8ng condidon. Water quality impacts will be mifigated by use <br /> of oil sepazators at all outfall locations, a grass biofiltraaon swale for dischazge to Wetland D and <br /> a sheet-discharge filter strip for discharge to Wedand E. The peak rate of runoff into the weUands <br /> will increase, but since the contributory areas will not change, the total volume of water should not <br /> be significanfly different. Since WeUands D and E aze closed depressions, release rates aze not an <br /> issue. <br /> Perpetuation of exisang flow patterns and volumes will ensure that a positive hydraulic regime is <br /> maintained in the new wetland which does not exceed the natural condiuon, except for peak storm <br /> events. Such natursl conlrol will maintain hydrologic support functions and produce additional <br /> wedand habitat within ffie target areas, resu'.Ung in addiuonal wildlife support. <br /> 3.3.5 Instaltation of Al[ Planted Vegetatian <br /> Inasmuch as actual conditior.s during construction may dictate changes to the schemaflc design to be <br /> provided within an; final midgaticr.plan, a qualified wetland biologist should guide and coordinate <br /> the wefland creation project at various stages of the construction. Fall is the preferable season for <br /> installation of plant material, based on a combination of generally cooler temperatures and the onset <br /> of periods of increased rainfall. <br /> Native plants and naturalized species will be used to create the new weUands. Species have been <br /> selected on the basis of eheir suitability to the hydraulic regime to be created within the wetlands <br /> mitigation design (See Table 2). <br /> If identified plant species are not available, planting substitutions will require authorizaticn from the <br /> project biologist. Species-specit:c installaUon requirements, where applicable, ue detailed in the <br /> Wedand Miugation Planting Plan (Figure 2) <br /> Mukilteu Sch. Dist. Central Faetliry Firial tifirigation P(an <br /> oage 10 <br /> f,ocel6Sauer(aad c� As.cociatv,, Grc. <br /> � <br />