~r H <br />October 2, 2013 <br />Eugene Hearings Official <br />Eugene Planning and Development <br />Atrium Building , <br />99 West 10th Ave. <br />Eugene OR 97401 <br />Statement in opposition of the Oakleigh Meadows Tentative Planned Unit Development <br />Permit (PDT 13-0001) and Willamette Greenway Permit (WG 13-0001) <br />To whom it may concern: <br />I believe that some of the data submitted to the City of Eugene Planning Department fails to <br />account for significant historic Willamette river flows, elevations and on-site disposal of storm <br />water. <br />I refer specifically to the document "Geotechnical Investigation" by Foundation Engineering <br />dated 12 February, 2013. Page 2 of this document references "Ground Water" and certain tests <br />performed on 30 January 2013 on the site. I quote from their report: <br />E <br />Ground water seepage was encountered in the test pits located within the O <br />floodplain (TP-2, TP-4, TP-7 and TP-10)ot depths. ranging from ±10 to 11feet. <br />The rate of infiltration was observed to be rapid. Based on the proximity of the <br />site to the Willamette River and the presence of relatively permeable gravels at <br />deeper depths, we anticipate the local ground water conditions correspond closely <br />to the river elevation. (Emphasis mine).Areas of perched water may be encountered at relatively <br />shallow depths during the wet winter and spring months due to the presence of <br />fine-grained soils with low permeability. <br />According to the Army Corps of Engineers, the Willamette River level on this date measured <br />approximately 13 feet. Historical data shows the river elevation on 28 December 1998 to reach <br />a maximum of approximately 18 feet. This is a difference of approximately 5 feet. River level as <br />of today is approximately 11.6 feet. <br />Thus in a high-water year we can reasonably expect river levels to be significantly higher than <br />13 feet with a corresponding higher level of groundwater infiltration. The same paragraph cited <br />above gives passing reference to the presence of standing water "due to the presence of fine- <br />grained soils with low permeability. " Simply put, this means the site has poor drainage and will have <br />large puddles of standing water after higher amounts of rainfall. This standing water can only increase <br />since. the project must treat all rainfall on-site and cannot discharge any of this water into the city storm <br />sewers. <br />Their consultant agrees that the on-site disposal of storm water won't work because of the low O <br />permeability of the native soils. Reference is made to page 5 in the paragraph entitled "On-site Disposal <br />1056 <br />