2010-11-22_REVISION - M2009023 (6)

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Final Mitigation Plan for Long Hollow Reservoir La Plata River Mitigation Site (Department of the Army Permit No. 200375243) 1.0 INTRODUCTION A Special Condition of Department of the Army Permit No. 200375243 for the Long Hollow Reservoir project (Project) is to submit a final compensatory mitigation plan for approval by the Corps. Bikis Water Consultants, LLC (BWC) is providing information on items described in paragraphs 33 CFR Part 332 (c)(2) through (c)(14) in the Final Mitigation Rule, as required by this Special Condition. Information provided in this report serves to support and update the Revised Mitigation Plan (February 2008) and Addendum No. 1 (March 21, 2008) for the Project. The mitigation for the Project includes three activities: 1) establishment of 3.75 acres of new riparian wetlands on land along the La Plata River adjacent to a reclaimed gravel pit pond; 2) enhancement of 0.19 acre of the Long Hollow channel for native fish from the proposed reservoir downstream to the La Plata River (and construction of a parallel conveyance for high reservoir releases); and 3) enhancement of 2,770 linear-feet (LF) (4.77 acres) of riparian area along Long Hollow downstream of the dam by tamarisk removal and revegetation. The locations of the mitigation are shown on Figure 1. This plan addresses the La Plata River mitigation site (LPRMS), the first of the three mitigation activities for the Project. The lower Long Hollow stream and riparian enhancement work (items 2 and 3 above) is scheduled for fall 2011, and a detailed plan for these other mitigation activities will be provided to the Corps in advance of construction. 2.0 LA PLATA RIVER MITIGATION SITE PLAN The following provides the information requested for compliance with the Final Mitigation Rule (33 CFR 332). 2.1 Objectives The objective of the mitigation at the LPRMS is to provide self-sustaining and diverse wetlands that result in a net increase in wetland and aquatic functions in the lower La Plata River watershed. This will be accomplished by creating wetlands with a more diverse, multi-layered plant community with more varied hydrologic conditions. The mitigation does this by providing August 2010 Bikis Water Consultants, LLC Page 1