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TABLE OF CONTENTS <br />Executive Summary <br />Section1 Introduction ......................................................................................... ............................1 -1 <br />Section 2 Study Area Characteristics ............................................................. ............................... 2 -1 <br />2.1 <br />Location and Area ..................................................... ............................... <br />2 -1 <br />2. 1.1 Regional Drainage Context ........................... ............................... <br />2 -1 <br />2.1.2 City of Eugene .............................................. ............................... <br />2 -1 <br />2.1.3 River Road Santa Clara Basin ....................... ............................... <br />2 -7 <br />2.2 <br />Climate ......................................................................... ............................2 <br />-7 <br />2.3 <br />Land Use and Surface Cover .................................... ............................... <br />2 -8 <br />2.3.1 Existing Land Use ......................................... ............................... <br />2 -8 <br />2.3.2 Buildout Land Use ........................................ ............................... <br />2 -9 <br />2.3.2.1 Buildout Land Use Within the UGB ........................ <br />2 -10 <br />2.3.2.2 Projected Land Use Outside the UGB ..................... <br />2 -10 <br />2.3.3 Surface Cover .............................................. ............................... <br />2 -11 <br />2.3.3.1 Impervious Surfaces ...................... ...........................2 <br />-11 <br />2.3.3.2 Pervious Surfaces ...................... ............................... <br />2 -12 <br />2.4 <br />Landform, Topography, Slopes .............................. ............................... <br />2 -13 <br />2.5 <br />Surface Water Features and Drainage System ........ ............................... <br />2 -14 <br />2.5.1 Waterways ....................................................... ...........................2 <br />-14 <br />2.5.1.1 A -1 Channel .................................. ...........................2 <br />-14 <br />2.5.1.2 Flat Creek .................................. ............................... <br />2 -14 <br />2.5.1.3 Spring Creek ............................. ............................... <br />2 -15 <br />2.5.1.4 Willamette Overflow ................ ............................... <br />2 -15 <br />2.5.1.5 Highway 90 ................................... ...........................2 <br />-16 <br />2.5.2 Wetlands ..................................................... ............................... <br />2 -16 <br />2.5.3 Public Piped Drainage System .................... ............................... <br />2 -16 <br />2.5.4 Drywell Drainage System ............................... ...........................2 <br />-17 <br />2.5.5 Maintaining the Drainage System ............... ............................... <br />2 -17 <br />2.5.6 Floodplain ................................................... ............................... <br />2 -17 <br />2.6 <br />Water Quality .......................................................... ............................... <br />2 -17 <br />2.6.1 Documented Water Quality Problems ........ ............................... <br />2 -18 <br />2.6.1.1 Chemical Stormwater Monitoring Data ................... <br />2 -18 <br />2.6.1.2 Findings from Macroinvertebrate Sampling............ <br />2 -22 <br />2.6.2 Oregon Department of Environmental Quality Water <br />Quality Limited Designations [303(d) List] .............................. <br />2 -22 <br />2.6.3 Natural and Built Conditions ...................... ............................... <br />2 -23 <br />2.6.4 Conclusions ..................................................... ...........................2 <br />-24 <br />2.7 <br />Rare, Threatened, and Endangered Plants, Animals, and <br />Communities........................................................... ............................... <br />2 -25 <br />2.8 <br />Soils ............................................................................. ...........................2 <br />-25 <br />2.8.1 Permeability ................................................ ............................... <br />2 -26 <br />2.8.2 Runoff Potential .......................................... ............................... <br />2 -26 <br />2.8.3 Erodible Soils .............................................. ............................... <br />2 -27 <br />N:ASTORMWATER \City of EugencARR_SC Stormwater Basin Plan\2012 Document \Master_ Plan _9- 18- 12_DR-AFT Word Version.doc i <br />