Woolsey Fire Cleanup Sampling and Analysis Plan Santa Monica Mountains National Recreation Area Paramount Ranch, Peter Strauss Ranch, Morrison Ranch, Rocky Oaks, Cooper Brown, Dragon Property, Miller Property, Arroyo Sequit, Circle X Ranch Prepared by Terraphase Engineering, Inc. 5/27/2020 Santa Monica Mountains National Recreation Area May 27, 2020 Page | i Signatories: [Federal Government Lead] [Signature] [Date Signed] [Cleanup Lead] [Signature] [Date Signed] [Legal Lead] [Signature] [Date Signed] [Regional Coordinator] [Signature] [Date Signed] [Contaminated Sites Program] [Signature] [Date Signed] By signing above, the signatories verify that they understand and concur with the information, procedures, and recommendations presented herein. Santa Monica Mountains National Recreation Area May 27, 2020 Page | ii Table of Contents List of Figures ........................................................................................................................................ v List of Tables .......................................................................................................................................... v 1 Introduction .................................................................................................................................. 1-1 1.1 CERCLA and National Park Service (NPS) Authority ................................................... 1-1 1.2 Purpose of Field Sampling...................................................................................................... 1-2 2 Site Description and Conceptual Site Model ...................................................................... 2-4 2.1 Site Description .......................................................................................................................... 2-4 2.1.1 Project Areas .................................................................................................................................. 2-4 2.1.2 Waste Characteristics ................................................................................................................ 2-6 2.1.3 Site Geology .................................................................................................................................... 2-7 2.1.4 Site Hydrology ............................................................................................................................... 2-7 2.1.5 Local Climate ................................................................................................................................. 2-7 2.1.6 Ecological Setting and Sensitive Environments ............................................................. 2-8 2.1.7 Current and Future Property Use Scenarios .................................................................... 2-2 2.1.8 Summary of Previous Investigations ................................................................................... 2-2 2.1.9 Contaminants of Potential Concern ..................................................................................... 2-2 2.1.10 Media of Potential Concern ..................................................................................................... 2-2 2.2 Scenarios for Potential Human and Ecological Exposure .......................................... 2-2 2.2.1 Human Receptors and Exposure Pathways ...................................................................... 2-2 2.2.2 Ecological Receptors and Exposure Pathways ................................................................ 2-3 2.2.3 Key CSM Assumptions ................................................................................................................ 2-3 3 DQO Planning Team and Stakeholders ................................................................................ 3-1 3.1 DQO Planning Team .................................................................................................................. 3-1 3.2 Decision-Makers ........................................................................................................................ 3-1 3.3 Stakeholders ................................................................................................................................ 3-1 4 Data Quality Objectives ............................................................................................................. 4-2 4.1 State the Problem(s) ................................................................................................................. 4-2 4.2 Identify the Goal(s) of the Investigation ........................................................................... 4-2 4.3 Identify Information Inputs ................................................................................................... 4-3 4.3.1 Previous Data Usability ............................................................................................................. 4-3 4.3.2 Data to be Collected in the Current Investigation ......................................................... 4-3 4.4 Define the Boundaries of the Investigation ..................................................................... 4-4 4.4.1 Spatial Boundaries ...................................................................................................................... 4-4 4.4.2 Temporal Boundaries ................................................................................................................ 4-4 4.4.3 Sampling Areas ............................................................................................................................. 4-5 4.5 Develop the Analytic Approach ............................................................................................ 4-5 4.5.1 Decision or Estimation Parameters ..................................................................................... 4-5 4.5.2 Action Levels .................................................................................................................................. 4-5 Santa Monica Mountains National Recreation Area May 27, 2020 Page | iii 4.6 Performance or Acceptance Criteria .................................................................................. 4-6 4.6.1 Quality Assurance/Quality Control ...................................................................................... 4-6 4.6.2 Decision Error Limits and Uncertainty Evaluation.................................................... 4-12 4.6.3 Data Validation and Usability ............................................................................................. 4-12 4.7 Plan for Obtaining the Data ................................................................................................. 4-13 5 Field Sampling Plan .................................................................................................................... 5-1 5.1 Ash Sampling ............................................................................................................................... 5-1 5.1.1 Ash Sampling Locations ............................................................................................................ 5-1 5.1.2 Ash Sampling Protocol .............................................................................................................. 5-1 5.1.3 Ash Sampling Health and Safety ........................................................................................... 5-1 5.1.4 Ash Field Measurements ........................................................................................................... 5-1 5.1.5 Ash Analytical Measurements/Methods ............................................................................ 5-2 5.2 Background Soil Sampling ..................................................................................................... 5-2 5.2.1 Background Soil Sampling Locations ................................................................................. 5-2 5.2.2 Background Soil Sampling Protocol .................................................................................... 5-2 5.2.3 Background Soil Sampling Health and Safety ................................................................ 5-2 5.2.4 Background Soil Field Measurements ................................................................................ 5-2 5.2.5 Ash Analytical Measurements/Methods ............................................................................ 5-3 5.3 Post-Removal Soil Sampling .................................................................................................. 5-3 5.3.1 Post-Removal Soil Sampling Locations .............................................................................. 5-3 5.3.2 Post-Removal Soil Sampling Protocol ................................................................................. 5-3 5.3.3 Post-Removal Soil Sampling Health and Safety ............................................................. 5-3 5.3.4 Post-Removal Soil Field Measurements ............................................................................. 5-3 5.3.5 Post-Removal Soil Analytical Measurements/Methods .............................................. 5-3 5.4 Sample Handling ........................................................................................................................ 5-4 5.4.1 Sample Designation .................................................................................................................... 5-4 5.4.2 Sample Labeling ..........................................................................................................................