-,,,_ -, ­ DAM MASTER PLAN AND ENVIRONMENTAL ASSESSMENT 1 LOPEZ DAM MASTER PLAN AND ENVIRONMENTAL ASSESSMENT U.S. Army Corps of Engineers Los Angeles District June2005 ! t Lopez Dam Basin Master Plan - 1 ­ Table of Contents Section · Page TABLE OF CONTENTS ................. .. ................................................. ........ .......... ............... ... .... 2 PREFACE ························································································································· 5 CHAPTER I - INTRODUCTION ................................................................................................... 6 1.1 Location ............................................................................................................. 6 1.2 Project Authorization ......................................................................................... 6 1.3 Project Purpose ................................................................................................. 6 1.4 Land Allocation .................................................................................................. 6 1.5 Purpose of Master Plan ..................................................................................... 7 1.6 Project Scope .................................................................................................... 8 CHAPTER 2 - GOVERNING LAWS AND REGULATIONS ...................................................... 11 2.1 Applicable Public Laws.................................................................................... 11 2.1.1 Federal Laws ...................................................................................... 11 .2.1.2 State Laws .......................................................................................... 12 2.2 Applicable Regulations .................................................................................... 12 2.3 Pertinent Publications ...................................................................................... 13 CHAPTER 3 - PROJECT DESCRIPTION ................................................................................. 14 3.1 Introduction ...................................................................................................... 14 3.2 Flood Damage Reduction Project Component... ............................................. 14 3.2.1 Project Data ........................................................................................ 14 3.2.2 Reservoir Operations and Management ............................................ 14 3.2.3 Flood Damage Reduction Requirements ........................................... 15 3.2.4 Flood Damage Reduction Structures ................................................. 16 3.3 Recreation Project Component ....................................................................... 22 3.3.1 Existing Recreation Use ..................................................................... 22 3.3.2 Recreation Supply .............................................................................. 22 3.3.3 Opportunities and Constraints ............................................................ 22 3.3.4 Flood Damage Reduction Structures ................................................. 25 3.3.5 Recreation Demand ............................................................................ 25 3.4 Demographics ................................................................................................. 26 CHAPTER 4 - RESOURCE USE OBJECTIVES ....................................................................... 27 4.1 Authorization- Recreation Resource Development ......................................... 27 4.2 General Resource Objectives ......................................................................... 27 4.3 Recreation Resource Objectives ..................................................................... 27 4.4 Environmental Resource Objectives ............................................................... 28 CHAPTER 5 - EXISTING RESOURCE DEVELOPMENT......................................................... 29 5.1 Development of Existing Facilities ................................................................... 29 Lopez Dam Basin Master Plan -2­ CHAPTER 6 - RESOURCE ANALYSIS .................................................................................... 30 6.1 Biological Resources ....................................................................................... 30 6.1.1 Introduction ......................................................................................... 30 6.1.2 Vegetation .......................................................................................... 30 6.1.3 Environmentally Sensitive Species .................................................... 34 6.2 Geology ........................................................................................................... 34 6.2.1 Site Geology ....................................................................................... 34 6.2.2 Seismicity ........................................................................................... 35 6.2.3 Performance History ........................................................................... 35 6.3 Watershed Hydrology ...................................................................................... 35 6.3.1 Groundwater....................................................................................... 35 3.3.2 Surface Water Quality ........................................................................ 35 6.4 Climate ............................................................................................................ 36 6.5 Air Quality ........................................................................................................ 36 6.6 Historic, Archaeological, and Cultural Features .............................................. 37 6.7 Access ............................................................................................................. 37 6.8 Existing Adjacent Land Uses........................................................................... 37 6.9 Utilities ............................................................................................................. 37 6.10 Outgrants ......................................................................................................... 37 . CHAPTER 7-LAND CLASSIFICATION ................................................................................... 40 7.1 Land Classifications ........................................................................................ 40 7.2 Classification Definitions Per ER 1130-2-550 ................................................. 40 7.2.1 Project Operations .............................................................................. 40 7.2.2 Recreation .......................................................................................... 40 7.2.3 Mitigation ............................................................................................ 40 7.2.4 Multiple Resource Management... ...................................................... 40 7.2.5 Easements.......................................................................................... 41 7.3 Proposed Lopez Dam Land Classifications .................................................... 41 7.3.1 Proposed Operations .......................................................................... 41 7.3.2 Recreation .......................................................................................... 41 7.3.3 Multiple Resource Management.. ....................................................... 41 7.3.4 Easements.......................................................................................... 42 CHAPTER 8 - PROPOSED RESOURCE USE PLAN............................................................... 44 8.1 Resource Development ................................................................................... 44 8.1.1 Planning Area 1 .................................................................................. 44 8.1.2 Planning Area 2 .................................................................................. 44 8.1.3 Planning Area 3 .................................................................................. 44 8.1.4 Planning Area 4 .................................................................................. 45 8.1.5 Planning Area 5 .................................................................................. 45 CHAPTER 9- CONCLUSION ................................................................................................... 48 9.1 Conclusion ....................................................................................................... 48 9.2 Fut~re Development........................................................................................ 48 CHAPTER 10- RECOMMENDATIONS .................................................................................... 49 Lopez Dam Basin Master Plan i --' -3­ I ,J TABLES Table 3.2 Max. Inflow, Outflow, and Elevation for Frequencies ...................................... 14 Table 3.2.4 Pertinent Data for Lopez Dam and Reservoir ................................................. 15 Table 3.3 Minimum Guidelines for Basin Land Use Projects .......................................... 23 Table 3.4 Demographics ................................................................................................. 25 PLATES Plate 1 Regional Map ...................................................................................................