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Revised Workplan-Additional Site Investigation for PFAS BSK Project E20-016-01F <br /> Stockton Metropolitan Airport(SCK) March 1, 2023 <br /> Stockton, California Page i <br /> Table of Contents <br /> 1 INTRODUCTION...............................................................................................................................1 <br /> 2 BACKGROUND.................................................................................................................................1 <br /> 2.1 Site Location and Description..................................................................................................1 <br /> 2.2 Site Operational History Overview..........................................................................................2 <br /> 2.3 Prior Environmental Investigations .........................................................................................2 <br /> 2.4 PRA 1—Wash Rack .................................................................................................................3 <br /> 2.5 PRA 2—Former Runway near Present Cargo Area...................................................................3 <br /> 2.6 Project History........................................................................................................................3 <br /> 3 ENVIRONMENTAL SETTING.............................................................................................................7 <br /> 3.1 Topography and Drainage.......................................................................................................7 <br /> 3.2 Soils........................................................................................................................................7 <br /> 3.3 Geology and Hydrogeologic Setting ........................................................................................7 <br /> 3.4 Sensitive Receptors.................................................................................................................8 <br /> 4 PURPOSE OF THE INVESTIGATION.................................................................................................10 <br /> 5 PROJECT APPROACH.....................................................................................................................10 <br /> 6 SCOPE OF WORK...........................................................................................................................15 <br /> 6.1 First Phase of the Investigation.............................................................................................15 <br /> 6.1.1 Pre-Field Activities............................................................................................................15 <br /> 6.1.2 Advancement of Borings and Sample Collection ............................................................... 16 <br /> 6.1.3 Analytical Testing..............................................................................................................20 <br /> 6.1.4 Progress Report................................................................................................................20 <br /> 6.2 Storm Drain Network Information ........................................................................................21 <br /> 6.3 Second Phase of the Investigation.........................................................................................21 <br /> 6.3.1 Pre-Field Activities............................................................................................................21 <br /> 6.3.2 Advancement of Borings and Sample Collection ...............................................................22 <br /> 6.3.3 Analytical Testing..............................................................................................................26 <br /> 6.4 Soil Boring Abandonment.....................................................................................................27 <br /> 6.5 Equipment Decontamination Procedures..............................................................................27 <br /> 6.6 Investigation Derived Waste.................................................................................................27 <br /> 6.7 Report of Findings (First and Second Phases of the Investigation Combined) ........................28 <br /> 7 PROJECT SCHEDULE.......................................................................................................................28 <br /> 8 LIMITATIONS.................................................................................................................................28 <br /> 9 REFERENCES..................................................................................................................................29 <br /> Text Tables <br /> Text Table 1 Municipal Water Wells Identified Within One Mile of Potential Release Areas................9 <br /> Text Table 2 First Phase Sampling Activities...................................................................................... 12 <br /> Text Table 3 Second Phase Sampling Activities................................................................................. 14 <br />