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TABLE OF CONTENTS <br /> Page <br /> EXECUTIVESUMMARY....................................................................................................................i <br /> 1.0 INTRODUCTION...................................................................................................................1 <br /> 2.0 SITE BACKGROUND............................................................................................................1 <br /> 2.1 HISTORICAL SITE USE.....................................................................................1 <br /> 2.2 PRODUCT RELEASES AND SOURCE AREAS.............................................1 <br /> 2.3 SITE GEOLOGY AND HYDROGEOLOGY....................................................2 <br /> 2.3.1 REGIONAL GEOLOGY AND HYDROGEOLOGY.......................................2 <br /> 2.3.2 SOIL TYPES.........................................................................................................2 <br /> 2.3.3 GROUNDWATER DEPTH AND FLOW DIRECTION.................................2 <br /> 2.3.4 GROUNDWATER QUALITY ASSESSMENT................................................3 <br /> 2.4 RISK EXPOSURE PATHWAY ANALYSIS.....................................................4 <br /> 2.4.1 SOIL......................................................................................................................4 <br /> 2.4.2 GROUNDWATER..............................................................................................4 <br /> 2.4.3 POTENTIAL VAPOR RECEPTORS.................................................................5 <br /> 2.4.4 SURFACE WATER BODIES..............................................................................5 <br /> 3.0 REMEDIATION HISTORY...................................................................................................5 <br /> 3.1 1987 SEPARATE PHASE HYDROCARBON (SPH) RECOVERY................5 <br /> 3.2 1993 TO 2005 GROUNDWATER EXTRACTION (GWE) OPERATIONS..5 <br /> 3.3 1996 TO 2001 SOIL VAPOR EXTRACTION (SVE)OPERATIONS.............6 <br /> 3.4 2004 TO 2005 OXYGEN INJECTION PILOT TESTING................................6 <br /> 3.5 2006 TO CURRENT TEMPORARY GWE OPERATIONS.............................6 <br /> 3.6 2008 DUAL-PHASE EXTRACTION (DPE) PILOT TESTING......................7 <br /> 3.7 2009 AIR SPARGE (AS)/SVE PILOT TESTING.............................................7 <br /> 4.0 DISTRIBUTION OF COCS....................................................................................................7 <br /> 4.1 HYDROCARBON DISTRIBUTION IN SOIL..................................................7 <br /> 4.2 HYDROCARBON DISTRIBUTION IN GROUNDWATER..........................8 <br /> 4.3 GROUNDWATER ANALYSIS AND PLUME MODELING........................9 <br /> 5.0 FEASIBILITY STUDY AND CORRECTIVE ACTION PLAN........................................10 <br /> 5.1 PROPOSED INTERIM SITE CLEANUP GOALS.........................................10 <br /> 5.2 DRAFT LOW-THREAT UNDERGROUND STORAGE TANK (UST) CASE <br /> CLOSUREPOLICY...........................................................................................11 <br /> 5.3 REMEDIAL ALTERNATIVES DISCUSSION AND APPROACH.............12 <br /> 5.3.1 DPE.....................................................................................................................12 <br /> 5.3.1.1 DESCRIPTION..................................................................................................12 <br /> 5.3.1.2 FEASIBILITY......................................................................................................13 <br /> 5.3.1.3 RECOMMENDATION.....................................................................................16 <br /> 5.3.2 AS/SVE..............................................................................................................17 <br /> 5.3.2.1 DESCRIPTION..................................................................................................17 <br /> 241729(33) CONESTOGA-ROVERS&ASSOCIATES <br />