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Service. All herbicides and pesticides utilized will be those that are approved by the • appropriate state and federal governmental agencies responsible for the approval and distribution of such agents. Measures for Determining Success of Revegetation The success of revegetation will be determined as explained in subsection 4.15 Soil Testine Plan From conception to the mid-1990's, Colowyo tested for topsoil feRility. In order to assure that the reapplied topsoil will support the proposed post-mining land use of rangeland, a soil sampling program will be implemented. Soil samples were taken randomly over each retopsoiled area and were analyzed for nitrate-nitrogen, phosphorus, and potassium. Historical results indicated adequate nutrient value to support post-mining revegetation. Colowyo has demonstrated through numerous years of monitoring that topsoil fertility is not a concern at the mine; this is mainly due to the nutrient rich soil that is commonly present throughout the region. As a result, Colowyo has suspended the soil testing program requirements, until such time as Colowyo determines that the soil fertility adversely affects the reclamation and/or the post-mining land use. As needed other soil amendments will be added to the reclaimed areas 20 support reclamation efforts. Acid-Forming and Toxic-Forming Materials No significant acid-forming materials exist within the overburden soil or coal seams to be mined. Therefore, Colowyo will not undertake special handling procedures as described in Section 2:05.3. A detailed description of the chemical characteristics of soils and overburden materials is presented under Sections 2.04.6 and 2.04.9. For a detailed description of the special handling of spoil material and sampling programs, refer to the Production Methods and Equipment Segment of this section. s 2.05-57 Revision Date: 10/22/04 Revision No.: TR-59