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1 1 1 1 I u 1 1 1 D. The potential for impact to threatened and endangered species and the specific measures available to remedy any impacts that may occur including their feasibility and likelihood of success. E. A plan for monitoring the effects of stocking nonnative fishes on the endangered Colorado River fishes. Monitoring to determine the impacts and remediation needs of stocking actions would be conducted for all the alternatives. The Interagency Standardized Monitoring Program currently in place under the Recovery Program would be used by all alternatives. However, the level of monitoring differs somewhat between the alternatives and is therefore addressed under each alternative. C. PREFERRED ALTERNATIVE Habitats used by trout and the endangered fishes generally do not overlap in the Upper Colorado River Basin. Negative impacts by trout have not been specifically identified in the Upper Basin nor considered a problem by the Recovery Implementation Program (U.S. Fish and Wildlife Service 1987). If impacts become evident in the future this information may be used to modify the stocking procedures. Therefore, stocking of trout anywhere in the Upper Basin, except in occupied habitat, is permitted. This includes the stocking of trout directly into riverine habitats. Stocking permitted on a routine basis, including floodplain ponds is presented in Table 1. All other stocking below the 50-year floodplain, not allowed as routine, would be prohibited. The following conditions apply to stocking of nonnative fishes within the 50- year floodplainZ: A. Private Ponds: The stocking of largemouth bass, bluegill, black crappie, and triploid grass carp for ponds within the 50-year floodplain in the Upper Colorado River Basin will require that the ponds be bermed to FEMA standards to the 50-year floodplain. If an .outlet exists on the pond, the outlet must be screened prior to stocking. The stocking plan, screening, and berming must be approved by the appropriate State wildlife agency and the Fish and Wildlife Service. Once approved, future stocking of that pond is considered routine, not requiring further approval. Screens and berms will be inspected annually by State wildlife agency personnel. If berming or screening fail to control escapement of nonnative fishes, then that pond will require a case-by-case review prior to any additional stocking. In areas where the 50- or 100-year floodplain boundary are not known, the point 5 feet above the OHWL may be used as the boundary location for the 50-year floodplain and 5 '/z feet above the OHWL can be used to represent the 100-year floodplain (see Appendix B). 10