1.1 MB pdf - Bolsa Chica Lowlands Restoration Project

Contents
Section
Page
Executive Summary......................................................................................................................ES-1
Introduction and Project Approach (Section 1)............................................................ ES-2
Problem Formulation (Section 2).................................................................................... ES-3
Analysis (Section 3) .......................................................................................................... ES-3
Exposure Characterization (Section 3.1) ....................................................................... ES-4
Ecological Effects Characterization (Section 3.2) ......................................................... ES-8
Risk Characterization (Section 4) ................................................................................. ES-10
Conclusions and Recommendations (Section 5) ........................................................ ES-11
1. Introduction..................................................................................................................................1-1
1.1 Objectives and Scope.....................................................................................................1-3
1.2 Project Approach ...........................................................................................................1-4
1.3 Guidance.........................................................................................................................1-6
1.4 Assumptions ..................................................................................................................1-6
1.5 Organization of the ERA Report .................................................................................1-8
2. Problem Formulation..................................................................................................................2-1
2.1 Site Background.............................................................................................................2-1
2.1.1 Location/Setting............................................................................................2-1
2.1.2 Climate............................................................................................................2-2
2.1.3 Site History.....................................................................................................2-2
2.1.4 Previous Investigations ................................................................................2-4
2.2 Ecological Characterization..........................................................................................2-5
2.2.1 Identification of Habitats..............................................................................2-5
2.2.2 Identification of Potential Ecological Receptors........................................2-6
2.3 Chemicals of Potential Ecological Concern ...............................................................2-8
2.3.1 Preliminary Data Evaluation .......................................................................2-8
2.3.2 Preliminary Background Evaluation ..........................................................2-9
2.3.3 Preliminary Evaluation of Chemical Contamination.............................2-10
2.4 Assessment Endpoints and Measures ......................................................................2-11
2.4.1 Assessment Endpoints................................................................................2-12
2.4.2 Risk Hypotheses ..........................................................................................2-12
2.4.3 Measures.......................................................................................................2-13
2.5 Ecological Conceptual Site Model.............................................................................2-14
2.5.1 Identification of Representative Species ..................................................2-14
2.5.2 Exposure Pathway Inclusion/Exclusion..................................................2-17
2.6 Biota Sampling in Nearby Areas ...............................................................................2-18
SAC/143368(CONTENTS.DOC) i ERA REPORT
7/31/02