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TABLE OF CONTENTS 5.1 Evaluation of Natural Resources Under Existing and Expected FutureConditions ..................................................... ............................... 5 -1 5.2 Development of the Natural Resources Strategy ...... ............................... 5 -3 5.2.1 Capital Project Alternatives .......................... ............................... 5 -4 5.2.2 Development Standard Alternatives ............. ............................... 5 -4 Section 6 Integrated Stormwater Management Strategy .............................. ............................... 6 -1 6.1 CP and Development Standard Strategies ................ ............................... 6 -1 6.2 Summary of Strategy Benefits .................................. ............................... 6 -5 6.3 Summary of Strategy Implementation and Costs ..... ............................... 6 -5 N:ASTORMWATER \City of EugencARR_SC Stormwater Basin Plan\2012 Document \Master_ Plan _9- 18- 12_DR-AFT Word Version.doc ii 2.8.4 Unstable Slopes ........................................... ............................... 2 -27 2.8.5 Hydric Soils ................................................ ............................... 2 -27 2.9 Groundwater ........................................................... ............................... 2 -28 2.10 Existing and Planned Educational Facilities ........... ............................... 2 -29 2.11 Existing and Planned Park and Recreational Facilities .......................... 2 -29 Section 3 Flood Control Evaluation ................................................................ ............................... 3 -1 3.1 Hydrologic/Hydraulic Model Development ............. ............................... 3 -1 3. 1.1 River Road Santa Clara Basin Hydrologic Data .......................... 3 -1 3.1.2 River Road Santa Clara Basin Hydraulic Data ............................ 3 -4 3.2 Model Validation Process ......................................... ............................... 3 -6 3.3 Model Results ........................................................... ............................... 3 -9 3.4 Flooding Problems Identified by the Model ........... ............................... 3 -10 3.5 Development of the Flood Management Strategy .. ............................... 3 -10 3.5.1 Capital Projects to Address Capacity Deficiencies ................... 3 -11 3.5.2 Selected Projects to Address Flows Associated with Drywell Decommissioning ......................... ............................... 3 -13 3.5.3 Selected Development Standard Alternatives ............................ 3 -15 Section 4 Water Quality Evaluation ................................................................... ............................4 -1 4.1 Regulatory Drivers Related to Water Quality ........... ............................... 4 -1 4.1.1 Stormwater Discharges to Surface Waters ... ............................... 4 -1 4.1.2 Stormwater Discharges to the Subsurface .... ............................... 4 -2 4.2 Evaluation of Existing and Expected Future Water Quality Conditions................................................................. ............................... 4 -4 4.3 Development of the Water Quality Strategy ............. ............................... 4 -7 4.3.1 Capital Project Alternatives ......................... ............................... 4 -7 4.3.2 Development Standards to Address Water Quality ................... 4 -34 Section 5 Stormwater Related Natural Resources ........................................ ............................... 5 -1 5.1 Evaluation of Natural Resources Under Existing and Expected FutureConditions ..................................................... ............................... 5 -1 5.2 Development of the Natural Resources Strategy ...... ............................... 5 -3 5.2.1 Capital Project Alternatives .......................... ............................... 5 -4 5.2.2 Development Standard Alternatives ............. ............................... 5 -4 Section 6 Integrated Stormwater Management Strategy .............................. ............................... 6 -1 6.1 CP and Development Standard Strategies ................ ............................... 6 -1 6.2 Summary of Strategy Benefits .................................. ............................... 6 -5 6.3 Summary of Strategy Implementation and Costs ..... ............................... 6 -5 N:ASTORMWATER \City of EugencARR_SC Stormwater Basin Plan\2012 Document \Master_ Plan _9- 18- 12_DR-AFT Word Version.doc ii