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Public Works Engineering Division City of Eugene MEMOR~NDL;jM 244 E. Broadway Eugene, Oregon 97401 (541)682-5560 (541) 682-8410 FAX Date: Apri16, 2000 To: File From: Terry Colvin Subject: River Pointe Pond Outfall Project #3849 River Pointe Pond is located North of Ayres Rd. and North of the River Pointe subdivision. It is actually North of Mirror Pond Way. This may indicate the pond name is different than the project title but that is one of many items for discovery. Discovery is the key description of this years phase of the project. Originally outlined as a open water way project with the potential for "pilot project" status. This project site may hold many barriers to that concept. The pond is the outfail for most of the drainage from the three River Pointe subdivisions. It may also accept drainage from the creek flowing from Gilham Rd. across Ayres and East of the subdivisions. I understand that it was originally created ~ by the construction of the Earthen Dam along the North side. There was some concern this could be t breached during high flows and cause flooding damage to the Wildish property to the North. A 10" outfall was constructed at the North West corner of the pond and now releases overflow onto their property. There is no indication that this water ever flows to either river and may in fact percolate into j the soil. There is some assumption that the ground is very porous since two gravel mines exist at this ' location. This may be an issue with open water way construction but has yet to be examined. Wildish has expressed concern with the "additional" flows being directed onto their property and how c that effects their operation. There has been some discussion of this with the City Manager and their r representatives. We will need to continue this discussion with them and talk about what they are concerned with and what plans they have for their property and how it might be effected by this project. i Other areas of concern and needs for clarification are: t E Interaction with other agencies such as Lane County, potential need for extra territorial F extension. Project would extend outside of U.G.B.. r • Topographic limitations; grade, soil, land use i • Needs to construct culvert bridge structures to accommodate the varied truck and transport issue on the two gravel extraction operations. Translates to larger cost. • Regulations; Fishery regulations (State and Federal), local watershed ordinance, Planning, Endangered species and plant issues.... • Other property owner issues There certainly will be other issues that need addressing as this goes forward. None of which may be fatal to the success of the project but most likely time consuming. This project has the potential to be a phased project over several years, depending on what direction is chosen.