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soil (i.e., wood chip mulch, surface mulch, erosion control matting, etc.) will be considered in the formulation of amendments. While it is not desirable to fertilize native plant communities on a continliirlg basis, it is often necessary to augment soil fertility for several yeazs while nutrient cycll;s and soil microbial populations reestablish themselves. In particulaz, nitrogen is extremely mobile in the soil profile and is easily lost from the system. This is of greater concern before soils have had time to "settle" and before vegetation becomes fumly established. Therefore, application of soil fertility amendments may be accomplished through multiple applications. For example nitrogen may be applied at two separate times. Alight application in the fall in conjunction with seeding may be used to promote organic decay and to stimulate the cazbon-nitrogen cycle. A second application may be undertaken in the spring after plants have initiated growth but prior to summer dormancy (cool season plant species management) or at the beginning of the summer growth season (warm season plant species management). Should vegetation fail to become established across large azeas, additional soil testing may be performed to determine if nutrient deficiency is a contributing factor. If fertility test results :indicate soil nutrient availability plays a role in Rvegetation failures, appropriate corrective measures will be identified and implemented. For example, the application of custom fenilizer blends may be necessary. Besides chemical amendments, cultural applications such as the interseeding of nitrogen fixing plant species may be considered. Salvage and reconstruction of soil will be planned and scheduled to avoid periods when unnecessary soil damage would result from these activities. Soils that are excessively dry or wet experience greater damage during handling than those with moderate moisture contents. To the extent possible, salvage and reconstruction activities will be lxrformed when soil moistures are normal and not at extremes (excessively dry or wet). ftlso, frozen soils are readily susceptible to damage, so salvage during the winter will be avoided unless absolutely • necessary to avoid resource loss. 5.1.3 Revegetation Three distinct types of seed mixtures will be designed to meet specific revegetation purposes or goals az the Yankee Gulch Project. The three basic types include Critical Area Stabilization seed mixtures, Interim Revegetation seed mixtures and Permanent Revegetation seed mixtures. These three basic mixtures will be formulated to meet the various needs azld requirements associated either with specialized erosion control applications or with interim or permanent revegetation establishment on disturbed lands. Anticipated use applications and.species selection are described for each seed mixture type below. From yeaz to yeaz, the commercial availability of suitable seed stocks may require the substitution of equivalent species in a seed mixture. When it becomes necessary to modify the composition of any of these seed mixtures (i.e., plant species substitutions or substantial modification of pure live seed percentages), such changes will be submitted to the BLM for review and approval prior to use in revegetation operations. American Soda recognizes that the need may arise to perform special augmentative seedings for various reasons during the term of this project. When such plantings are needed, American Soda will work with the BI.M to develop appropriate seed mixtlues to meet the needs of these specialized plantings. Critical Area Stabilization seed mixtures will be used when quick establishment of temporary cover to protect high value resources from excessive erosion is the primazy focus. Typical Critical Area Stabilization seed mixture applications include but are not limited to the following applications: Amaipn Soda, L.L.P. S~ Soil Conservazion, Fmsioa and Sedi~oa,t Control, n:clamarioa and Revegetation Plan October 28, 199g Revised AP,i19, 1999