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Scope of Work CH2MHILL <br /> <br /> Riverpoint/Gilham Road Stormwater Management <br /> Project <br /> PREPARED FOR: Terry Colvin/City of Eugene <br /> Paul Klope/City of Eugene <br /> PREPARED BY: Mark Bransom/CHZM HILL <br /> REVIEWED BY: Vince Rybel/CH2M HILL <br /> DATE: February 17, 2003 <br /> Project Description <br /> The City of Eugene has requested a scope of work to perform an evaluation of hydrologic <br /> and hydraulic function of the Riverpoint/Gilham Road area. Tasks are designed to evaluate <br /> conditions and function and assess any potential risks associated with system surcharge, <br /> flooding, etc. The area under consideration is the sub-basin flowing from the Gilliam School <br /> area and all areas draining into Mirror Pond. Associated with this area is the gravel mining <br /> being done North of this project area, and the potential hydrologic and hydraulic <br /> connectivity between these sites. Additional questions that are to be addressed in this <br /> investigation include: locations of infiltration of surface water; means to predict where, and <br /> under what circumstances, flooding may occur; how development in the area can be <br /> accommodated to mn~*n»e the potential for flooding; and, what information can and <br /> should the City provide to developer's engineers to address potential flooding or altered <br /> hydrology resulting from development. Other objectives of the project include <br /> refinement/update/"calibration" of the City's hydraulic model from Mirror Pond to the East <br /> end of the Gilliam School ditch reach. <br /> This phase of the analysis is intended to support development of alternatives during a <br /> subsequent phase to address regional stormwater management. The following scope of <br /> work outlines the tasks, and presents a phased approach to the project. We propose to first <br /> compile and review existing information, and perform preliminary hydraulic evaluations to <br /> develop a conceptual model of the hydrologic and hydraulic function, and how surface <br /> water runoff and groundwater respond to precipitation and changes in river levels. <br /> Following this initial assessment, we will better understand whether additional quantitative <br /> information is required, e.g., groundwater levels, pond levels, discharge data, etc., in order <br /> to develop, calibrate, and run an analytical surface water/groundwater model, and how <br /> robust such an analysis should be. For the purpose of estimating level of effort for this <br /> work, we have assumed that sufficient information is available to complete all the tasks, <br /> including any groundwater/surface water analytical modeling. Any additional required <br /> tasks or changes in level of effort will be detailed in a separate scope of work. <br /> PDXlC:~D000MENTS AND SETfINGS~BDONNERBLLOCAL SETTINGS\TEMPORARY INTERNET FlLESVDLK2~RIVERPOINT GILHAM STORMWATER SCOPE <br /> REVISED.DOC I <br /> <br />