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Los Angeles Regional Dredged Material Management Plan Feasibility Study

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Los Angeles Regional Dredged Material Management Plan Feasibility Study U.S. Army Corps of Engineers Los Angeles District LOS ANGELES REGIONAL DREDGED MATERIAL MANAGEMENT PLAN FEASIBILITY STUDY BASELINE CONDITIONS (F3) REPORT U.S. Army Corps of Engineers Los Angeles District 915 Wilshire Boulevard Los Angeles, California 90017 August 2004 Table of Contents 1 INTRODUCTION................................................................................................... 1 1.1 Study Authority............................................................................................ 1 1.2 Local Sponsorship ...................................................................................... 1 1.3 Study Purpose ............................................................................................ 1 1.4 Study Scope................................................................................................ 2 1.5 Study Process............................................................................................. 2 1.6 Public Involvement and Coordination ......................................................... 3 1.6.1 Consulting Agencies...................................................................... 4 1.6.2 Contaminated Sediments Task Force ........................................... 4 1.6.3 Public Meetings ............................................................................. 6 1.7 Prior Studies, Reports, and Existing Federal Projects ................................ 6 1.7.1 Prior Studies by USACE................................................................ 6 1.7.1.1 Santa Monica Bay General ................................................. 7 1.7.1.2 Marina del Rey and Ballona Creek...................................... 7 1.7.1.3 King Harbor ......................................................................... 8 1.7.1.4 San Pedro Bay General ...................................................... 8 1.7.1.5 Los Angeles River Estuary ................................................ 11 1.7.1.6 Southern California Regional ........................................... 11 1.7.2 Prior Studies by Others................................................................ 13 1.7.2.1 Santa Monica Bay General ............................................... 13 1.7.2.2 Marina del Rey and Ballona Creek.................................... 13 1.7.2.3 King Harbor ....................................................................... 13 1.7.2.4 San Pedro Bay General .................................................... 13 1.7.2.5 Southern California Regional ............................................ 14 1.7.3 Existing Federal Projects............................................................. 15 2 DESCRIPTION OF STUDY AREA...................................................................... 16 2.1 Study Area ................................................................................................ 16 2.1.1 Santa Monica Bay........................................................................ 16 2.1.1.1 Marina del Rey .................................................................. 16 2.1.1.2 Ballona Creek.................................................................... 16 2.1.1.3 King Harbor ....................................................................... 19 2.1.2 San Pedro Bay............................................................................. 19 2.1.3 Los Angeles River Estuary .......................................................... 21 2.1.4 Alamitos Bay................................................................................ 24 2.2 Physical Setting ........................................................................................ 24 2.2.1 Bathymetry................................................................................... 24 2.2.2 Geology ....................................................................................... 26 2.2.3 Climate......................................................................................... 31 2.2.4 Oceanography ............................................................................. 31 2.3 Existing Coastal Structures....................................................................... 33 2.3.1 Malibu Pier................................................................................... 33 2.3.2 Santa Monica Pier and Breakwater ............................................. 33 2.3.3 Venice Pier .................................................................................. 33 2.3.4 Marina del Rey Breakwater, Jetties, and Harbor Complex.......... 35 2.3.5 Manhattan Beach Pier ................................................................. 35 2.3.6 Redondo Beach Pier and King Harbor ........................................ 35 2.3.7 Los Angeles/Long Beach Harbor Complex.................................. 35 2.3.8 Belmont Pier ................................................................................ 36 2.3.9 Alamitos Bay Jetties .................................................................... 36 Los Angeles Regional DMMP FS August 2004 Baseline Conditions (F3) Report i U.S. Army Corps of Engineers, LA District Table of Contents 3 EXISTING (BASELINE) CONDITIONS............................................................... 37 3.1 Dredging History and Disposal Practice ................................................... 37 3.2 Regional Dredged Material Characteristics .............................................. 39 3.2.1 Santa Monica Bay........................................................................ 41 3.2.1.1 Sediment Source(s)........................................................... 41 3.2.1.2 Physical Characteristics .................................................... 41 3.2.1.3 Chemical & Toxicological Characteristics ......................... 41 3.2.1.4 Source of Contamination................................................... 41 3.2.1.5 Biological Community........................................................ 42 3.2.2 San Pedro Bay – Port of Los Angeles ......................................... 42 3.2.2.1 Sediment Source(s)........................................................... 42 3.2.2.2 Physical Characteristics .................................................... 42 3.2.2.3 Chemical and Toxicological Characteristics...................... 42 3.2.2.4 Source of Contamination................................................... 43 3.2.2.5 Biological Community........................................................ 43 3.2.3 San Pedro Bay – Port of Long Beach.......................................... 43 3.2.3.1 Sediment Source(s)........................................................... 43 3.2.3.2 Physical Characteristics .................................................... 43 3.2.3.3 Chemical & Toxicological Characteristics ......................... 44 3.2.3.4 Source of Contamination................................................... 44 3.2.3.5 Biological Community........................................................ 44 3.2.4 San Pedro Bay – Los Angeles River Estuary .............................. 44 3.2.4.1 Sediment Source(s)........................................................... 44 3.2.4.2 Physical Characteristics .................................................... 45 3.2.4.3 Chemical and Toxicological Characteristics...................... 45 3.2.4.4 Source of Contamination................................................... 45 3.2.4.5 Biological Community........................................................ 45 3.2.5 Alamitos Bay................................................................................ 45 3.2.5.1 Sediment Source(s)........................................................... 46 3.2.5.2 Physical Characteristics .................................................... 46 3.2.5.3 Chemical and Toxicological Characteristics...................... 46 3.2.5.4 Source of Contamination................................................... 46 3.2.5.5 Biological Community........................................................ 46 3.3 Biological Resources in the Study Area.................................................... 47 3.3.1 Habitats ....................................................................................... 47 3.3.2 Biological Communities ............................................................... 47 3.3.3 Sensitive and Recreationally Important Species ......................... 48 3.4 Water Quality ............................................................................................ 49 3.5 Commercial and Recreational Resources ................................................ 49 3.5.1 Santa Monica Bay........................................................................ 49 3.5.1.1 Marina del Rey .................................................................. 49 3.5.1.2 King Harbor ....................................................................... 50 3.5.2 San Pedro Bay............................................................................. 51 3.5.2.1 Ports of Los Angeles and Long Beach .............................. 51 3.5.2.2 Los Angeles River Estuary ................................................ 52 3.5.2.3 Alamitos Bay ..................................................................... 52 3.6 Land Use................................................................................................... 53 3.7 Cultural Resources ................................................................................... 53 3.8 Economic Analyses..................................................................................
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