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DRAFT Geosyntec <br /> consultants <br /> TABLE OF CONTENTS <br /> 1. INTRODUCTION....................................................................................................................1 <br /> 2. SITE BACKGROUND.............................................................................................................2 <br /> 2.1 RRI-Historical Use........................................................................................................2 <br /> 2.2 UST 817B -Historical Use .............................................................................................2 <br /> 2.2.1 Geology and Hydrogeology................................................................................2 <br /> 2.2.2 Site-Specific Geology and Hydrogeology...........................................................3 <br /> 3. SUMMARY OF PREVIOUS INVESTIGATIONS.................................................................4 <br /> 3.1.1 Removal of Tank USTs at 817B (1992 through 1996).......................................4 <br /> 3.1.2 1998 Initial Investigation.....................................................................................4 <br /> 3.1.3 1999 - 2000 Investigation....................................................................................5 <br /> 3.1.4 2008 Soil Investigation........................................................................................5 <br /> 3.1.5 Summary of 1998 to 2008 Investigation Data.....................................................6 <br /> 3.1.6 Groundwater Monitoring.....................................................................................6 <br /> 3.1.7 Corrective Action Plan........................................................................................6 <br /> 4. DATA GAP INVESTIGATION..............................................................................................8 <br /> 4.1 Objectives........................................................................................................................8 <br /> 4.2 Soil Results and Evaluation.............................................................................................9 <br /> 4.3 Groundwater Results and Evaluation..............................................................................9 <br /> 5. SOIL VAPOR INVESTIGATION.........................................................................................10 <br /> 5.1 Objectives, Scope of Work, and Methodology.............................................................10 <br /> 5.1.1 Field Preparation...............................................................................................10 <br /> 5.1.2 Drilling and Soil Vapor Probe Construction.....................................................10 <br /> 5.1.3 Sampling Equipment.........................................................................................11 <br /> 5.1.4 Shut-In Tests......................................................................................................11 <br /> 5.1.5 Leak Testing......................................................................................................11 <br /> 5.1.6 Purge and Sampling Rate..................................................................................11 <br /> 5.1.7 Soil Vapor Sampling and Analysis ...................................................................12 <br /> 5.2 Soil Vapor Analytical Results and Evaluation..............................................................12 <br /> 5.3 Investigative Derived Waste .........................................................................................12 <br /> 6. CONCLUSIONS AND RECOMMENDATIONS.................................................................13 <br /> 7. REFERENCES .......................................................................................................................14 <br /> Draft Soil and Soil Vapor Investigation i i August 30,2019 <br />