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TABLE OF CONTENTS <br /> 1.0 INTRODUCTION .......................................................................................5 <br /> { <br /> 2.0 SITE INFORMATION....... .........................................................................6 <br /> 2.1 Site Description.......................................................................................... 6 <br /> 2.2 Previous Environmental Investigations.................................................... 6 <br /> 2.3 Sensitive Receptor Survey.........................................................................9 <br /> 3.0 SUBSURFACE CONDITIONS.................................................................11 <br /> 3.1 Geology .................................................................................................... 11 <br /> 3.2 Hydrogeology.............. ... ................................................................... 11 <br /> 3.2.1 Sand A Monitoring Wells .................................................................. 11 ;{ <br /> 3.2.2 Sand B Monitoring Wells...........__.................................................... 12 1 <br /> 3.2.3 Sand C Monitoring Wells................................................................... 12 <br /> 3.2.4 Vertical Hydraulic Gradient............................................................... 12 <br /> 3.3 Extent of Petroleum and Fuel-Oxygenate Hydrocarbon Impact........... 12 <br /> 3.3.1 Soil.................................................................................................... 12 <br /> 3.3.2 Groundwater.................... .................................. 14 <br /> 4.0 RISK ASSESSMENT...............................................................................16 <br /> �. <br /> 5.0 NATURAL ATTENUATION AND FATE/TRANSPORT OF MTBE..........18 <br /> 5.1 Natural Attenuation of MTBE................................................................ 18 <br /> 5.2 Fate and Transport of MTBE................................................................. 18 <br /> 5.2.1 Model Input Parameters..................................................................... 19 <br /> 5.2.2 Model Calibration and Sensitivity...................................................... 21 <br /> 5.2.3 Model Output..........................................:.......................................... 22 <br /> 6.0 REQUEST FOR REGULATORY CASE CLOSURE................................23 <br /> 6.1 Leak Has Stopped— Ongoing Sources Removed....................................23 <br /> 6.2 Site is Adequately Characterized............................................................ 23 <br /> 6.3 Dissolved-Phase Hydrocarbon Plume is Stable...................................... 24 <br /> 6.4 Sensitive Receptors & Water Wells Not Likely to be Impacted............ 24 <br /> 6.5 No Significant Risk to Human Health or Environment.........................24 <br /> 6.6 Request for Regulatory Case Closure/No Further Action................... 24 <br /> 7.0 LIMITATIONS..........................................................................................25 <br /> Page iii 5MATUS <br />