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III. Environmental Setting, Impacts,and Mitigations F. Vegetation and Wildlife proponent should contact CDFG regarding the project's need for a Streambed Alteration Agreement at least 30 days prior to channel disturbance. Implementation of the measures presented below would likely satisfy mitigation requirements/conditions attached to the CDFG Agreement,the Corps'individual or nationwide Permit,and the RW CB's Section 401 water quality certification. Mitigation Measure F.I. Proposed as Part of the Project (a) As avoidance of this waterway is not a viable or biologically desirable mitigation strategy due to possible surface water contamination from the expanded landfill,the project sponsor shall replace the 4.5 acres of Little Johns Creek through(1)realigning the Creek as depicted in project plans to provide approximately 7.0 acres of watercourse and(2) constructing an approximately 4.3 acre detention basin as depicted on project plans (R.W. Beck and Associates, 1992). Creation of these features would provide a 2.5:1 acreage replacement of on-site water features. Given the relatively low values of the displaced watercourse,the 2.5:1 acres replacement ratio would adequately replace acreage of the existing feature. Identified by this EIR (b) Prior to final project approval,the project proponent should prepare a formal Creek Realignment and Revegetation Plan(CRRP), and should submit the CRRP to the CDFG, USFWS, RWQCB,and Corps for their review and approval. The CRRP should include detailed specifications of the relocated watercourse and surface water detention basin; documentation of use and proposed planting locations/acreage of specific native trees, shrubs, and herbs as riparian/wetland vegetation4; methods for bank stabilization/erosion control during both construction and operational phases;methods for maintaining plantings in a healthy state(e.g.,use of artificial irrigation, necessary soil preparation as based on site specific studies performed by a qualified restoration ecologist as part of CRRP preparation); appropriate contingency plans; and monitoring periods(a minimum of 5 years)and conditions(annual monitoring reports submitted to the CDFG,USFWS,Corps, and RWQCB). This document would likely be required by the CDFG,USFWS,RWQCB, and Corps to ensure no net loss of watercourse acreage,function,and value(as part of the regulatory processes described above and in Appendix D). 4 Selection of planting locations/species used will have to consider possible conflicts with the use of the geomembrane lining within the realigned Creek. Construction of an unlined riparian bench within the realigned watercourse may be necessary to accomodate revegetation requirements. HI.F.23