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TABLE OF CONTENTS <br /> Pace <br /> 1.0 INTRODUCTION...................................................................................................................1 <br /> 1.1 SITE INFORMATION........................................................................................1 <br /> 2.0 CURRENT ACTIVITIES........................................................................................................1 <br /> 2.1 GROUNDWATER MONITORING..................................................................1 <br /> 2.2 REMEDIATION..................................................................................................2 <br /> 2.2.1 GROUNDWATER EXTRACTION (GWE) SYSTEM OPERATION ............2 <br /> 2.2.2 AIR SPARGE (AS) AND SOIL VAPOR <br /> EXTRACTION (SVE) IMPLEMENTATION...................................................2 <br /> 3.0 CURRENT FINDINGS...........................................................................................................2 <br /> 3.1 GROUNDWATER ELEVATIONS AND FLOW DIRECTIONS...................2 <br /> 3.2 VERTICAL GRADIENTS...................................................................................3 <br /> 3.3 SPHS.....................................................................................................................3 <br /> 3.4 ISOCONCENTRATION MAPS........................................................................3 <br /> 3.4.1 TPHD ISOCONCENTRATION MAP..............................................................4 <br /> 3.4.2 TPHG ISOCONCENTRATION MAP..............................................................4 <br /> 3.4.3 BENZENE ISOCONCENTRATION MAP......................................................4 <br /> 3.4.4 MTBE ISOCONCENTRATION MAP..............................................................4 <br /> 3.4.5 TBA ISOCONCENTRATION MAP.................................................................4 <br /> 3.5 PETROLEUM CONSTITUENT <br /> CONCENTRATION TRENDS AND PLUME STABILITY...........................5 <br /> 3.5.1 SOURCE AREA WELLS....................................................................................5 <br /> 3.5.2 DOWN-GRADIENT WELLS.............................................................................5 <br /> 3.5.3 CROSS-GRADIENT WELLS.............................................................................6 <br /> 3.5.4 UP-GRADIENT WELLS.....................................................................................6 <br /> 3.5.5 DEEPER WATER-BEARING ZONE WELL....................................................6 <br /> 3.6 GWE SYSTEM PERFORMANCE.....................................................................7 <br /> 3.6.1 OPERATIONAL ISSUES....................................................................................7 <br /> 3.6.2 SYSTEM EFFECTIVENESS................................................................................7 <br /> 4.0 PROPOSED ACTIVITIES......................................................................................................7 <br /> 4.1 GROUNDWATER MONITORING..................................................................7 <br /> 4.2 REMEDIATION..................................................................................................7 <br /> 241]29(32) CONESTOGA-ROVERS&ASSOCIATES <br />