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<br /> <br /> <br /> <br />t <br />1 <br /> <br /> <br />1 <br /> <br /> <br />area for which it will serve as a growth medium. Topdressing materials will be redistributed az <br />variable depths within a vegetation community. Creating variability in topdressing replacement <br />depth is desirable because it creates microhabitats that promote development of floral diversity. <br />Generally, soils will not be redistributed when they are saturated or excessively wet. Graded <br />surfaces will be scarified or left in a roughened condition to ensure adequate subsoil to <br />ropdressing interface and to avoid slippage or other forms of undesirable mass surface <br />movement. <br />A rough soil surface will be left whenever possible following reconstruction operations. <br />Surface roughness may be created or enhanced through shank ripping, contour furrowing, land <br />imprinting or dugouts. A rough surface crrztes microhabitats that favor the establishment of <br />the species contained in the revegetation seed mix. A rough surface also serves to promote <br />water harvesting, increases infiltration, and improves soil moisture retention and availability. <br />Appropriate erosion control structures will be placed on steep slopes to protect reconstructed <br />soils from excessive erosion. Structures to be used for this purpose include, but are not limited <br />to water bars, diversion ditches or berms, and gradient or total containment terraces. Designs <br />for these structures are contained in Appendix E. These structures may be used singly or in <br />combination to achieve the necessary level of soil protection. <br />In addition to physical erosion control methods and practices, the establishment of permanent, <br />diverse vegetative cover is one of the most effective long-term stahiGzation components. <br />Normally revegetation operations will be conducted during the first locally accepted planting <br />period following the reconstruction of soils. An exception [o this planting schedule may occur <br />rn low precipitation years when soil moisture content is poor. When this or similar conditions <br />occur, areas may be allowed to Ge fallow to allow winter precipitation to recharge soil moisture <br />prior to planting. Establishing vegetation is discussed in greater detail in Section 5.1.3. <br />After replacement, topdressed soils may be tested for fertility. When tested, the standard soil <br />' parameters to be analyzed will include pH, electrical conductivity, and nitrogen, phosphorous <br />and potassium content Additional parameters may be added if soils used for reconstruction are <br />known to be deficient in other macronutrients or micronutrients. Soil samples will be taken at a <br />' density sufficient to characterize the area to which amendments will be applied. Samples will <br />be composited and split, with one split being sent to the laboratory for analysis and one being <br />retained for additional future analysis if necessary. Retained splits will be kept until the <br />operations for which they were taken have been completed. Fertility amendments will be <br />' formulated and applied based on fertility testing. The amount of organic materials in and on the <br />soil (i.e., wood chip mulch, surface mulch, erosion control matting, etc.) will be considered in <br />the formWation of amendments. <br />' While it is not desirable to fertilize native plant communities on a continuing basis, it is often <br />necessary to augment soil fertility for several years while nutrient cycles and soil microbial <br />populations reestablish themselves. In particular, nitrogen is extremely mobile in the soil <br />' profile and is easily lost from the system. This is of greater concern before soils have bad time <br />to "settle" and before vegetation becomes firmly established. Therefore, application of soil <br />fertility amendments may be accomplished through mWtiple applications. For exarrrple <br />' nitrogen may be applied at two separate times. Alight application in the fall in conjunction <br />with seeding may be used to promote organic decay and to stimWate the carbon-nitrogen cycle. <br />A second application may be undertaken in the spring after plants have initiated growth but <br />' prior to summer domrancy (cool season plant species management) or at the beginning of the <br />summer growth season (warn season plant species management). Should vegetation fail to <br />become established across large areas, additional soil testing may be performed to determine if <br />' American Soda, LLP. 5-3 <br /> Soil Conun'auao. Erasion and Sediment <br /> Coned, reclamatlon and Revegeutloo Plan <br />' (k'lobcr 28. 1998 <br />