1.1   Objectives and Scope

1.2   Guidelines

3.1   Land Use Survey

3.1.1   Site Hydrogeology

3.1.2   Water Well Survey

3.1.3   Water Bodies and Sensitive Environmental Areas

3.2   Receptor Survey

3.2.1   Human Receptors

3.2.2   Ecological Receptors

4.1   Evaluation of Chemistry Data for Usability

4.1.1   Data Validation Codes

4.1.2   Nondetects and SQLs

4.1.3   Duplicate Samples

4.1.4   Compounds Analyzed Using Multiple Analytical Methods

4.1.5   Sample Quantitation Limits

4.1.6   Development of Data Sets

4.2   Statistical Methodology

4.2.1   Major Tasks

4.2.2   Statistical Analysis Methods

4.2.3   Outlier Analysis

4.2.4   Tests of Background vs. Site-Specific Concentrations

4.2.5   Analysis of VOCs and SVOCs

4.3   Screening Approaches and Identification of COPCs

4.3.1   Approach to Evaluate Frequency of Detection

4.3.2   Determination of Applicability of RRS Standard 1 Closure

4.3.3   Determination of Critical PCLs

5.1   Characterization of Exposure Setting

5.2   Development of the Conceptual Site Models

5.3   Identification of Potential Receptor Scenarios

5.3.1   Resident

5.3.2   Commercial/Industrial Worker

5.4   Exposure Areas

5.4.1   Sediment and Surface Water

7.1   Ecological Risk Assessment Overview

7.1.1   Tiered-Analysis Approach

7.1.2   Ecological Risk Assessment Process

7.1.3   Existing Field Observational Studies

7.2   Problem Formulation

7.2.1   Characterization of Chemical Stressors

7.2.2   Identification of Ecosystems Potentially at Risk

7.2.3   Decelopment of CSMs for Potential Ecological Exposure Pathways

7.2.4   Endpoint Selection

7.2.5   Characterization of Exposure

7.2.6   Identification of Ecological Receptors

7.2.7   Direct Exposure to Soils

7.2.8   Qualitative Assessment of Soil Contaminant Transfer to Aquatic Systems

7.2.9   Exposure to Wildlife by Dietary Intake

7.2.9.1   Direct Soil Ingestion

7.2.9.2   Food Intake

7.2.9.3   Dietary Intake Calculation

7.2.10   Calculation of Tissue Concentrations from Soils Data

7.2.10.1   Transfer from Soil to Vegetation Tissues

7.2.10.2   Transfer to Vertebrate Tissues

7.3   Characterization of Ecological Effects

7.3.1   Benchmarks for Effects on Vegetation

7.3.2   Benchmarks for Effects on Wildlife

7.3.3   Benchmark Extrapolations

7.3.3.1   Endpoint Extrapolations

7.3.3.2   Site-Specific Extrapolations

7.4   Ecological Risk Characterization

7.4.1   Methodology

7.4.2  Analysis of Uncertainties in the Ecological Risk Assessment