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TABLE OF CONTENTS <br /> SECTION Page No. <br /> 1.0 INTRODUCTION...............................................................................................................1 <br /> 2.0 SITE BACKGROUND.........................................................................................................1 <br /> 2.1 Site Description..................................................................................................................1 <br /> 2.2 Site Geology and Hydrogeology.........................................................................................1 <br /> 2.3 Summary of Site Investigations and Remedial Actions.....................................................2 <br /> 2.3.1 Summary of Remedial Actions.......................................................................................3 <br /> 2.3.2 Summary of 2005 Soil Excavation................................................................................ 4 <br /> 3.0 SUMMARY OF AVAILABLE DATA.................................................................................. 4 <br /> 3.1 Hydrocarbon-Impacted Soil ............................................................................................. 4 <br /> 3.2 Hydrocarbon-Impacted Groundwater...............................................................................5 <br /> 3.2.1 Grab Groundwater Data................................................................................................5 <br /> 3.2.2 Groundwater Monitoring Data......................................................................................5 <br /> 4.0 WATER QUALITY OBJECTIVES......................................................................................7 <br /> 5.0 MASS CALCULATION.......................................................................................................7 <br /> 5.1 Estimation of Hydrocarbons Removed..............................................................................7 <br /> 5.2 Estimation of Residual Hydrocarbons.............................................................................. 8 <br /> 5.3 Time to Achieve Water Quality Objectives........................................................................ 9 <br /> 6.o IMPACTS TO SENSITIVE RECEPTORS AND BENEFICIAL USES................................ 9 <br /> 6.1 Groundwater Water Supply Wells .................................................................................... 9 <br /> 6.2 Surface Water.................................................................................................................... 9 <br /> 7.0 HUMAN HEALTH RISK ASSESSMENT.........................................................................10 <br /> 8.0 CONCLUSIONS AND RECOMMENDATION................................................................. 11 <br /> 9.0 REFERENCES..................................................................................................................12 <br /> TABLES <br /> 1 Summary of Groundwater Elevations <br /> 2 Summary of Summary of Soil Analytical Data <br /> 3 Summary of Grab Groundwater Analytical Data <br /> 4 Summary of Groundwater Analytical Data <br /> 5 Summary of Mass Balance Calculations <br /> 6 Summary of Well Information from Sensitive Receptor Survey <br /> 7 Summary of Calculated Risks/Hazards — Inhalation of Indoor Air <br /> 8 Summary of Calculated Risks/Hazards — Incidental Exposure to Soil <br /> FIGURES <br /> 1 Vicinity Map <br /> 2 Site Plan Showing Cross Section Locations <br /> 3 Cross Sections A-A'and B-B' <br /> 4 Groundwater Elevation Contour Map,July 28, 2010 <br /> 5 Historical Groundwater Flow Directions, December 1999 —July 2010 <br /> 6 TPH-d Concentrations in Deep Soil(50-6o fbg) <br /> 7 TPH-d Concentrations in Groundwater—July 28, 2010 <br /> 8 TPH-d Degradation Projection — Monitoring Well MW-5 <br /> 9 Sensitive Receptor Survey— Location of Water Supply Wells within 1/2 Mile Radius <br /> i <br />