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Remedial Investigation QAPP Stockton Army Aviation Support Facility,California TABLE OF CONTENTS Listof Tables............................................................................................................................................... iii Listof Figures............................................................................................................................................... v Listof Appendices........................................................................................................................................ v Acronymsand Abbreviations...................................................................................................................vi 1.0 Introduction......................................................................................................................................xii 1.0.1 Project Authorization......................................................................................................................xii 1.0.2 RI Purpose.....................................................................................................................................xiii 1.0.3 QAPP Document Organization......................................................................................................xiii Worksheets#1& 2:Title and Approval Page and QAPP Identifying Information ...................................1 1.1 Project Identifying Information.......................................................................................................1 1.2 Concurring Signatures....................................................................................................................1 Worksheets#3& 5: Project Organization and QAPP Distribution...........................................................2 Worksheets#4, 7, &8: Personnel Qualifications and Sign-off Sheet.....................................................4 Worksheet#6: Communication Pathways and Procedures................................................................. 10 Worksheet#9:Technical Project Planning Session Summary............................................................. 14 Worksheet#10: Conceptual Site Model ............................................................................................... 15 10.1 Facility Location and Description................................................................................................ 15 10.2 Facility Environmental Setting..................................................................................................... 15 10.2.1 Geology.......................................................................................................................................15 10.2.2 Hydrogeology..............................................................................................................................16 10.2.3 Hydrology....................................................................................................................................16 10.2.4 Climate........................................................................................................................................17 10.2.5 Current and Future Land Use....................................................................................................17 10.2.6 Sensitive Habitat and Threatened/Endangered Species........................................................17 10.3 History of PFAS Use...................................................................................................................... 17 10.4 Previous PFAS Studies................................................................................................................. 17 10.5 Preliminary Conceptual Site Model............................................................................................. 19 10.5.1 Summary of Areas of Interest....................................................................................................20 10.5.2 Current Understanding of Nature and Extent of Contamination.............................................22 10.5.3 Fate and Transport of PFAS.......................................................................................................27 10.5.4 Potential Receptors and Exposure Pathways...........................................................................28 Worksheet#11: Project Data Quality Objectives.................................................................................. 46 11.1 Step 1: State the Problem........................................................................................................... 46 11.2 Step 2: Identify the Goals of the Study....................................................................................... 47 11.3 Step 3: Identify Information Inputs............................................................................................. 50 11.4 Step 4: Define the Boundaries of the Study............................................................................... 50 11.5 Step 5: Develop the Analytic Approach ...................................................................................... 50 11.6 Step 6: Specify Performance/Acceptance Criteria .................................................................... 51 11.7 Step 7: Develop the Detailed Plan for Obtaining Data.............................................................. 51 PARSONS Table of Contents Page i