GoT- FINAL SUPPLEMENTAL ENVIRONMENTAL IMPACT REPORT No. 317 Western Plateau Preservation Plan PERMANENT DOCUMENT Prepared by: OUT CARD REQUIRED WHEN REMOVED FROM iCARDEX City of Thousand Oaks 2100 East Thousand Oaks Boulevard Thankyoul Records Management Thousand Oaks, California 91362 Contact Person: Greg Smith, Senior Planner 805) 449-2329 With the Assistance of: Padre Associates, Inc. 5450 Telegraph Road, Suite 101 Ventura, California 93003 February 1, 2002 w FINAL Supplemental Environmental Impact Report No. 317 WESTERN PLATEAU PRESERVATION PLAN February 1, 2002 q. x. ri yx fi A City of Thousand Oaks Western Plateau Preservation Plan Supplemental Environmental Impact Report TABLE OF CONTENTS Page 1. 0 INTRODUCTION ..... .................... ......... ....... ......................... ..... ::.......................... ... 1- 1 1. 1 Purpose And Legal Authority.............:..:....:...:..:.:.................:.................. I.... 1- 1 1. 2 Project Background...................................................................................... 1- 2 1. 3 Scope And Content .................................. ::....... :......... .;............................... 1- 3 1. 4 Lead, Responsible and Trustee Agencies .................................................. 1- 4 2. 0 SUMMARY................................................................................................................ 2- 1 2. 1 Project Synopsis.......................................................................................... 2- 1 2. 1. 1 Project Applicants ............................ :.......................... ................ ,.... 2- 1 2. 1. 2 Action Requested and Project Description ..................................... 2- 1 2. 1. 3 Location .................................... ........................... :............... ............ 2-2 2. 1. 4 Existing Environmental Setting....................................................... 2- 2 2. 1. 5 Areas of Controversy ............................................ __...................... 2- 13 2. 2 Summary of Environmental Impacts, Mitigation Measures and Alternatives 2- 13 I... I......... 3- 1 3.0 PROJECT DESCRIPTION..............................................................:.. I........ 3. 1 Project Location ................................................................................... 3- 1 3.2 Project Applicants......................................................................................... 3- 1 3. 3 Project Objectives ................................. ...............................6 ...... I .......... I .... .. 3- 1 3.4 Project Characteristics................................................................................. 3-2 3.5 Required Discretionary Approvals............................................................... 3-5 4.0 ENVIRONMENTAL SETTING.................................................................................. 4- 1 4. 1 Regional and Local Setting......................................................................... 4- 1 4.2 Site -Specific Setting ................ ............. ....:........ :..........wit .................. I.......... 4- 1 4.3 Land Use Regulation................................................................................... 4-2 5.0 ENVIRONMENTAL ANALYSIS................................................................................ 5- 1 5. 1 Grading........................................................................................................ 5. 1- 1 5. 1. 1 Setting ............................................. :.... :.... .......:.............................. 5. 1- 1 5. 1. 2 Impact Analysis......................................................:......................... 5. 1- 1 5. 1. 3 Mitigation Measures ............................ :....... ..................................... 5. 1- 3 5. 1. 4 Residual Impacts............................................................................. 5. 1- 4 5. 2 Viewshed..................................................................,.:..:............. 4........... 4... 5.2- 1 5. 2. 1 Setting............................................................................................. 5.2- 1 5. 2.2 Impact Analysis ......................... ......... :......... :.................................. 5.2- 1 5. 2.3 Mitigation Measures ......... ..................... :....................... ........... ........ 5.2- 15 5. 2.4 Residual Impacts.................................:............................................ 5.2- 16 CAPROJECT& TO WESTERN PLATEALIOR PRELIM FINAL\ EIRTOC.PFINAL.DOC Page 1 City of Thousand Oaks Western Plateau Preservation Plan Supplemental Environmental Impact Report TABLE OF CONTENTS ( Continued) Page 5. 3 Biology......................................................................................................... 5. 3- 1 5. 3. 1 Setting............................................................................................. 5. 3- 1 5. 3.2 Impact Analysis................................................................................ 5. 3- 6 5. 3. 3 Mitigation Measures........................................................................ 5.3- 13 5. 3.4 Residual Impacts............................................................................. 5.3- 14 5.4 Geotechnical Hazards.................................................................................. 5.4- 1 5.4. 1 Setting.............................................................................................. 5.4- 1 5.4. 2 Impact Analysis............................................................................... 5.4- 4 5.4.3 Mitigation Measures........................................................................ 5.4- 6 5.4. 4 Residual Impacts............................................................................. 5.4- 8 5. 5 Traffic 5. 5- 1 5. 5. 1 Setting............................................................................................. 5.5- 1 5. 5. 2 Impact Analysis............................................................................... 5.5- 5 5. 5. 3 Mitigation Measures...................................................... .... .,............. 5.5- 17 5. 5. 4 Residual Impacts............................................................................. 5. 5- 17 5.6 Noise............................................................................_................................ 5.6- 1 5. 6. 1 Setting.............................................................................................. 5.6- 1 5.6. 2 Impact Analysis............................................................................... 5.6-4 5.6. 3 Mitigation Measures......................................................................... 5. 6- 8 5.6. 4 Residual Impacts............................................................................. 5.6- 10 5. 7 Air Quality..................................................................................................... 5.7- 1 5.7. 1 Setting............................................................................................. 5.7- 1 5. 7.2 Impact Analysis............................................................................... 5.7-5 5. 7.3 Mitigation Measures......................................................................... 5.7- 8 5. 7.4 Residual Impacts............................................................................. 5. 7- 9 5. 8 Domestic Water............................................................................................ 5. 8- 1 5. 8. 1 Setting.............................................................................................. 5. 8- 1 5. 8. 2 Impact Analysis............................................................................... 5.8-2 5. 8. 3 Mitigation Measures......................................................................... 5. 8-4 5.8. 4 Residual Impacts............................................................................. 5. 8- 5 5. 9 Recreation.................................................................................................... 5. 9- 1 5. 9. 1 Setting............................................................................................. 5. 9- 1 5. 9.2 Impact Analysis............................................................................... 5. 9-2 5. 9. 3 Mitigation Measures......................................................................... 5. 9-3 5. 9. 4 Residual Impacts............................................................................. 5. 9-3 5. 10 Electricity...................................................................................................... 5. 10- 1 5.10. 1 Setting .....................•............_......................................._.................. 5. 10- 1 5. 10. 2 Impact Analysis............................................................................... 5. 10- 1 5. 10. 3 Mitigation Measures......................................................................... 5. 10-2 5. 10.4 Residual Impacts............................................................................. 5. 10- 3 CAPROJECTS\TO WESTERN PLATEALUIR PRELIM FINAL\EIRTOC.PFINAL. DOC Page ii City of Thousand Oaks Western Plateau Preservation Plan Supplemental Environmental Impact Report TABLE OF CONTENTS ( Continued) Page 5. 11 Schools......................................................................................................... 5. 11- 1 5. 11. 1 Setting............................................................................................