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S K Y L I N E R A N C H M O D I F I E D T R A C T 60922 A D D E N D U M
C O U N T Y O F L O S A N G E L E S

Table of Contents

Section Page

1. INTRODUCTION .............................................................................................................................. 1
1.1 PURPOSE OF ADDENDUM ........................................................................................................................... 1
1.2 CONTENT AND ORGANIZATION OF THIS ADDENDUM ............................................................. 3
2. ENVIRONMENTAL SETTING ......................................................................................................... 5
2.1 PROJECT LOCATION ....................................................................................................................................... 5
2.2 ENVIRONMENTAL SETTING ....................................................................................................................... 5
3. PROJECT DESCRIPTION............................................................................................................. 11
3.1 PROJECT BACKGROUND ............................................................................................................................. 11
3.2 MODIFIED PROJECT DESCRIPTION ...................................................................................................... 11
3.3 COUNTY ACTION REQUESTED ............................................................................................................... 14
4. ENVIRONMENTAL CHECKLIST .................................................................................................. 25
4.1 BACKGROUND .................................................................................................................................................. 25
4.2 ENVIRONMENTAL FACTORS POTENTIALLY AFFECTED ........................................................... 26
4.3 DETERMINATION (TO BE COMPLETED BY THE LEAD AGENCY) ......................................... 26
4.4 EVALUATION OF ENVIRONMENTAL IMPACTS ................................................................................ 27
5. ENVIRONMENTAL ANALYSIS ..................................................................................................... 29
5.1 AESTHETICS ...................................................................................................................................................... 29
5.2 AGRICULTURE AND FOREST RESOURCES ......................................................................................... 40
5.3 AIR QUALITY ..................................................................................................................................................... 42
5.4 BIOLOGICAL RESOURCES .......................................................................................................................... 49
5.5 CULTURAL RESOURCES ............................................................................................................................... 59
5.6 ENERGY ............................................................................................................................................................... 65
5.7 GEOLOGY AND SOILS .................................................................................................................................. 68
5.8 GREENHOUSE GAS EMISSIONS ............................................................................................................... 77
5.9 HAZARDS AND HAZARDOUS MATERIALS ......................................................................................... 81
5.10 HYDROLOGY AND WATER QUALITY ................................................................................................... 87
5.11 LAND USE AND PLANNING .................................................................................................................... 102
5.12 MINERAL RESOURCES ................................................................................................................................ 104
5.13 NOISE .................................................................................................................................................................. 105
5.14 POPULATION AND HOUSING ................................................................................................................ 111
5.15 PUBLIC SERVICES .......................................................................................................................................... 114
5.16 RECREATION .................................................................................................................................................. 121
5.17 TRANSPORTATION/TRAFFIC .................................................................................................................. 123
5.18 UTILITIES AND SERVICE SYSTEMS ...................................................................................................... 131
5.19 MANDATORY FINDINGS OF SIGNIFICANCE .................................................................................. 140
6. LIST OF PREPARERS ................................................................................................................ 143
7. REFERENCES ............................................................................................................................. 145

APPENDICES

Appendix A. Geotechnical Study
Appendix B. Traffic Study and Memo

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