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Pacific Water Resources, Inc. Upper Amazon Cr. at Kinney Park Channel Stabilization, Habitat and Water Quality Enhancement Project City of Eugene Public Works Department Project #3951 PACIFIC SCOPE OF WORK WATER RESOURCES, INC. July 22, 2003 Project Understanding The Kinney Park `Water Quality Facility' (AM06A) was originally proposed in Volume r II (Amazon Basin) of the City's Stormwater Basin Master Plan. Recently, the original project evolved into a more comprehensive channel and habitat restoration project with water quality features. The following pages outline in detail Pacific Water Resources, Inc.'s (PWR) approach and scope of work for this project. The objective of the project is to restore an old historic tributary (the `east fork') in the upper reach of the Amazon Creek Watershed in South Eugene. We believe that this tributary was filled and the drainage patterns altered during construction of the surrounding subdivision in the 1960s. Restoration of this tributary will enhance aquatic habitat by providing more natural area hydrology. It will also improve water quality by reducing higher (erosive) flows on the main stem (the `west fork') and reconnecting the historic floodplain area. Reestablishing the original drainage patterns will decrease flow in an existing undersized pipe diversion in Martin Street. And, it will increase floodplain storage, thereby mitigating the original impacts of the fill. A severe (three to four foot deep) headcut on the creek's main stem (the `west fork') should also be stabilized as part of this project. The main stem displays evidence of channel incision which this project will address. These problems maybe the result of increased flow on the main channel caused by the flow diversion and/or land use changes within the upstream basin. Stabilizing erosion here will require understanding the basin hydrology and fluvial geomorphology of this reach of Amazon Creek. The geomorphic