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Admin Order 58-12-14
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Admin Order 58-12-14
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Last modified
11/7/2012 2:23:00 PM
Creation date
11/7/2012 2:09:00 PM
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City Recorder
CMO_Document_Type
Admin Orders
Document_Date
11/2/2012
Document_Number
58-12-14
Author
CRO
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SECTION 2 Study Area Characteristics <br />• The extent of the open drainage system in the basin on a miles per square mile basis is in the <br />mid -range when compared with other Eugene drainage basins. <br />• At 34 percent, the basin currently has levels of imperviousness that are expected to degrade <br />water quality. Projections at UGB buildout indicate that the impervious surface area will <br />increase to 51 percent, which is the highest for all of the basins. <br />2.7 Rare, Threatened, and Endangered Plants, Animals, and Communities <br />Stormwater management decisions and practices can affect rare, threatened, and endangered <br />plant and animal species. Local populations can be reduced or even eliminated as a result of <br />decisions to pipe a waterway, install upstream detention, or to allow significant increases in <br />runoff due to new development. The purpose of this chapter is to describe the known rare species <br />and communities located in the River Road Santa Clara basin so that the details of these <br />resources can be consulted prior to any final decisions. Review of the Oregon Natural Heritage <br />Program database reveals no records of rare plant, animal, or community observations. <br />In March 1999, the National Marine Fisheries Service (NMFS) listed spring -run Chinook salmon <br />as a threatened species under the Endangered Species Act (ESA). It includes all naturally <br />spawned populations of Spring Chinook in the Clackamas River and in the Willamette River and <br />its tributaries above Willamette Falls, Oregon. Because runoff from Eugene discharges either <br />directly or indirectly to the Willamette River, the listing will affect the city's stormwater <br />management program and practices. A species that is listed as threatened means it is likely to <br />become endangered within the foreseeable future throughout all or a significant portion of its <br />range. Protective regulations, known as 4(d) rules, have been developed that are deemed <br />necessary and advisable to provide for the conservation of the species. These rules spell -out the <br />take prohibitions that pertain to Spring Chinook and focus on the type of activities that are likely <br />to lead to a "take." The City completed a review of its own processes, procedures, and <br />development standards and identified those that may not be compatible with the 4(d) rules for <br />potential adjustment. Lane County has established a Routine Road Maintenance Manual <br />outlining procedures and standards for road maintenance activities designed to be compatible <br />with the 4(d) rules. <br />2.8 Soils <br />Soil characteristics are important factors in predicting the amount, rate, and quality of <br />stormwater runoff and for selecting management measures for addressing the effects of runoff. <br />This section describes the key soil parameters relative to stormwater issues and the distribution <br />of those parameters in the River Road Santa Clara basin. All soils data were obtained from the <br />USDA Soil Survey of Lane County. Refer to Tables 2 -6 to 2 -8 and Maps 6 to 10 for a description <br />of the soil mapping units and relevant stormwater related data found in River Road Santa Clara <br />basin. <br />0:A25695978 Eugene RR-SC Final Basin Plan \Master Plan\FINAL 2- 2010AMaster_ Plan _3 -11 -10 FINAL Word Version AW Sec 2 Corr.doc 2 -25 <br />
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