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The genera! approach to vegetative clearing in both corridors will be to remove only that vegetation necessary for access and construction. For pzrposes of analysis in the EIS, it is reasonable to assume that all vegetation would be removed from the corridors. In actuality, [ow-lying vegetation (e.g., grasses) will probably remain over much of both corridors and woody vegetation wozrld remain wizerever passible within the construction corridor. Soil disturbance would occur only where local topography requires minor adjustments to allow uniforzn piping and where support pilings are placed. No substantive cut and fill is envisioned for the well field piping, but same will occur, as necessary. For purposes of analysis in the EIS, it is reasonable to assume that some soil distzrbance could occur over 80 percent of the piping corridor and 30 percent of the construction corridor. The following summarizes the estimates of disturbance associated with the well field piping in the for the 0-5 year mine panel. Area Piping Corridor Construction Corridor Total Disturbance Area Main Header System 1.95 acres 1.95 acres 3.90 acres Lateral System 1.47 acres 1.47 acres 2.94 acres Individual We[1 Piping 0.72 acres 0.72 acres 1.44 acres TOTAL 4.14 acres 4.14 acres 8.28 acres Within the total of 8.28 acres of disturbance, vegetation would be removed from the entire area and soils would be disturbed on about 4.55 acres. 23. Section 2.1.5, page 2-10 -The pond will be constructed with a single liner. How will American Soda monitor for leakage? What will they do if there is a leak? What is the expected water quality? How high will the berms be? This would affect the impact assessment for soils, vegetation, groundwater, etc. should there be a leak or overtopping. Several changes to the ponds have been made (also see item 2). The evaporation pond at the Piceance Site and both the evaporation pond and the MVR purge pond at the Parachute Site will be constnzcted with a double liner and leak detection system in accordance with the requirements of the Colorado Division of Minerals Geology (CDMG). The liner system will consist of two geornernbrane liners and a leak detection and collection systezn. The top liner will be 60-mil HDPE and the bottom liner will be 40-mil HDPE. Between the tzuo liners, a geonet mnterial will be installed. Geonets are geosynthetic materials that are designed to easily convey flzrids. The geonet will collect and transport any water that may leak through the upper liner. The geonet layer will drain to a szrmp system. The sump will be egzzipped with a szr6znersible pzrmp, zvlziclz will be azrtomatically activated by a fluid-level sensor switch in the suznp. T)ze szzznp pzzznp will disc{zarge any leakage back into the pond. 13