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TABLE OF CONTENTS <br /> 1.0 INTRODUCTION............................................................................................................................. 1 <br /> 1.1 Purpose............................................................................................................................................................................ 1 <br /> 1.2 Limitations....................................................................................................................................................................... 1 <br /> 1.3 User Reliance.................................................................................................................................................................. 1 <br /> 2.0 SITE BACKGROUND.......................................................................................................................2 <br /> 2.1 Site Description.............................................................................................................................................................2 <br /> 2.2 Site History......................................................................................................................................................................2 <br /> 2.3 Geology and Hydrogeology.....................................................................................................................................3 <br /> 3.0 FIELD ACTIVITIES...........................................................................................................................4 <br /> 3.1 Preparatory Activities..................................................................................................................................................4 <br /> 3.1.1 Utility Clearance.......................................................................................................................................................4 <br /> 3.1.2 Permitting...................................................................................................................................................................4 <br /> 3.1.3 Health and Safety Plan...........................................................................................................................................4 <br /> 3.2 Drilling Equipment.......................................................................................................................................................4 <br /> 3.3 Sample Locations..........................................................................................................................................................4 <br /> 3.4 Indoor Air Quality Sampling.....................................................................................................................................5 <br /> 3.4.1 Indoor Air Building Survey...................................................................................................................................5 <br /> 3.4.2 Air Sampling Equipment.......................................................................................................................................5 <br /> 3.4.3 Air Sampling Methodology..................................................................................................................................5 <br /> 3.5 Soil Sampling..................................................................................................................................................................6 <br /> 3.6 Groundwater Sampling...............................................................................................................................................6 <br /> 3.7 Soil Gas Sampling.........................................................................................................................................................7 <br /> 3.7.1 Soil Gas Probe Construction................................................................................................................................7 <br /> 3.7.2 Sub-Slab Soil Gas Probe Construction.............................................................................................................7 <br /> 3.7.3 Soil Gas Sampling Methodology.......................................................................................................................7 <br /> 3.8 Post-Sampling Activities............................................................................................................................................8 <br /> 4.0 DATA ANALYSIS............................................................................................................................9 <br /> 4.1 Laboratory Analysis......................................................................................................................................................9 <br /> 4.2 Regulatory Agency Comparison Criteria..............................................................................................................9 <br /> 4.3 Soil Sample Data Analysis..........................................................................................................................................9 <br /> 4.4 Groundwater Sample Data Analysis.......................................................................................................................9 <br /> 4.5 Soil Gas Sample Data Analysis.................................................................................................................................9 <br /> 4.6 Indoor Air Sample Data Analysis...........................................................................................................................10 <br /> 4.7 Discussion......................................................................................................................................................................10 <br /> 5.0 SUMMARY AND CONCLUSIONS.................................................................................................11 <br /> The following report Tables, Figures, and Appendices are attached at the end of this report. <br /> TABLES 1. Cumulative Summary of Investigation Scope <br /> 2. Soil Sample PCE Laboratory Results <br /> 3. Cumulative Soil Gas Sample CVOCs and PCE Laboratory Results <br /> 4. Air Sample PCE Laboratory Results <br /> Additional Subsurface Investigation Report PARTNER <br /> Project No.23-400162.14 <br /> July 31,2023 <br /> Page i <br />