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Cleanup in Vulnerable Communities'Initiative Final Project Reference:Bobson Cleaners <br /> Discovery and Enforcement Discovery Project Number:60688620-5.1 <br /> Investigation Work Plan <br /> Table of Contents <br /> 1. Introduction.........................................................................................................................................................1 <br /> 1.1 Work Plan Objectives and Scope............................................................................................................1 <br /> 1.2 Project Team Organization ......................................................................................................................2 <br /> 1.2.1 Roles and Responsibilities....................................................................................................................2 <br /> 1.2.2 Contact Information...............................................................................................................................2 <br /> 1.3 Work Plan Organization...........................................................................................................................3 <br /> 2. Site Background..................................................................................................................................................4 <br /> 2.1 Site Description and Location..................................................................................................................4 <br /> 2.1.1 Site Name(s),Address, and Size..........................................................................................................4 <br /> 2.1.2 Contact Person, Mailing Address and Telephone Number....................................................................4 <br /> 2.1.3 Database Number(s)and U.S. EPA Identification Number(s)...............................................................5 <br /> 2.1.3.1 Database Numbers..................................................................................................................................5 <br /> 2.1.3.2U.S. EPA Identification Number(s)...........................................................................................................5 <br /> 2.1.4 Assessor's Parcel Number(s)................................................................................................................5 <br /> 2.1.5 Township, Range, Section, Meridian and Coordinates..........................................................................5 <br /> 2.1.6 Maps and Photographs.........................................................................................................................6 <br /> 2.2 Regulatory Status....................................................................................................................................6 <br /> 2.3 Site Physical and Environmental Characteristics.....................................................................................6 <br /> 2.3.1 Topography...........................................................................................................................................6 <br /> 2.3.2 Geology and Soil Types........................................................................................................................6 <br /> 2.3.3 Hydrogeologic Setting...........................................................................................................................7 <br /> 2.3.4 Climatological Setting............................................................................................................................7 <br /> 2.4 Current and Historical Land Uses............................................................................................................7 <br /> 2.4.1 Property Ownership..............................................................................................................................7 <br /> 2.4.2 Facility Ownership and Operators.........................................................................................................7 <br /> 2.4.3 Business Type and Years of Operation.................................................................................................8 <br /> 2.4.4 Site Zoning............................................................................................................................................8 <br /> 2.5 Surrounding Property Land Uses ............................................................................................................8 <br /> 2.6 Previous Site Assessments .....................................................................................................................8 <br /> 2.7 Future Water Supply................................................................................................................................9 <br /> 2.8 Observations from Site Reconnaissance.................................................................................................9 <br /> 3. Sampling and Analysis Plan..............................................................................................................................10 <br /> 3.1 Recognized Environmental Concerns....................................................................................................10 <br /> 3.2 Sampling Strategy, Rationale, and Approach ........................................................................................10 <br /> 3.2.1 Soil Gas and Sub-Slab Soil Gas.........................................................................................................10 <br /> 3.2.2 Soil......................................................................................................................................................11 <br /> 3.2.3 Groundwater.......................................................................................................................................11 <br /> 3.2.4 Indoor and Ambient Air Sampling........................................................................................................12 <br /> 3.2.5 Sampling Methods and Procedures....................................................................................................12 <br /> 3.2.5.1 Utility Clearance ....................................................................................................................................12 <br /> 3.2.5.2Soil Gas and Sub-Slab Soil Gas Sampling............................................................................................12 <br /> 3.2.5.3Soil Matrix Sampling..............................................................................................................................14 <br /> 3.2.5.4Groundwater Sampling..........................................................................................................................14 <br /> 3.2.5.51ndoor and Ambient Air Sampling ..........................................................................................................14 <br /> 3.2.5.6 Field Quality Control Samples...............................................................................................................16 <br /> 3.2.5.7Field Equipment and Calibration............................................................................................................16 <br /> Prepared for: Department of Toxic Substances Control AECOM <br />