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• Highly erodible soils or situations will be avoided whenever possible; • Soils of the Thirteenmile Creek Tongue of the Green River Formation (Thirteenmile Tongue) will be avoided whenever possible to protect occupied and potential habitat of federally listed threatened plant species and other endemic plants; and • Road, well pad, and facility placement will avoid disturbance to mature ponderosa pine (Pinus ponderosa) trees whenever possible. 3.3 BMPs -DESCRIPTIONS AND SPECIFICATIONS BMPs will be selected and deployed to control erosion and prevent sedimentation on a site- specitic basis. Various methods, practices and structures will be holistically blended to achieve the desired level of control and protection. The BMPs contained in The Plan have been selected based on their ability to effectively eliminate or reduce erosion and sedimentation during development, operation and reclamation of the Yankee Gulch Project. The main criteria to be considered when selecting BMPs for a panicular application arc the specific erosion or sedimentation goals to he achieved, site-specific physical characteristics, cost effectiveness, and BLM and Colorado Division of Minerals and Geology ("CDMG") acceptance. BMPs will be tailored to meet the site-specific requirements to which they arc applied. A BMP evaluation matrix to select materials for specific applications may he used at American Soda's option (Appendix A). BMPs may be initially applied and/or reapplied during the project development, operational or reclamation phases. Surface water runoff impacts, and erosion and sediment transport from a site may be minimized or controlled by implementing the following BMPs: • Placing diversion structures to channel undisturbed runoff away from disturbed surtiaces; • Providing structures to collect, retain or treat runoff that contacts disturbed surfaces; • Temporarily stabilizing areas during development and operation phases, and permanently stabilizing and contemporaneously reclaiming them :LS operations arc completed: • Locating roads and other facilities where their actual or potential effect on water quality is minimized; • Implementing good housekeeping practices such as proper storage and spill prevention, especially when hazardous materials are handled: • Properly designing, constructing and maintaining the project and the necessary control structures and practices in a professional and workmanlike manner. Temporary BMPs will be designed for short-duration periods or until permanent BMPs ate implemented. Temporary BMPs will typically be used for periods up to one year or essentially one winter and spring runoff season, but may be used for longer periods if appropriate. Temporary BMPs may require significant maintenance depending on the extent of surface American S,xla. L.L.P. 3-4 Sod Conscrvanon. FIOSIOn anJ Scdimcm Control. Reclamnnon, and Revegetauon Plan October ?8. 1998 Revised April 9, 1999