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TABLE OF CONTENTS .................... .................... ....... ............ .................... 4 U 1.0 Introduction ................................:' ' LY 1.1 Site Description................ .......................................................................................... 4 1.2 Project History.... ......... ............................................................................... 4 L) 1.2.1 UST System Removal................................................................................ 4 C1.2.2 Initial Site Characterization............................................I.......................... 4 1.2.3 Remediation.of.Source Area ............................i..........4............................ 5 1.2.4 Additional Site Characterization.....;.................;...'................................... 6 r2k 6mediation By Batch Extraction1.2.5 Groundwate n...................................... 7 2.0 Groundwater Monitoring, Sampling and Analysis:....... ........................................................ 9 t 2.1' Groundwater Monitoring ................................... ......................................................... 9 2.2 Groundwater Sampling and'i�4nalysis ................................................... .................. 9 2.3 Wastewater Disposal....... ...............................................................................:.... 10 3.0 Site Conceptual Model.................... ....... ..................I.......................................................... 11 3.1 Source Area Evaluation..........................;................................................................. 11 3.1.1 Petroleum ''Hydrocarbon Mass in Soil (Pre-Remediation) ....................... 11 3,1.2 Petroleum11-1Y:'d'ro" 8arbon. Mass in Soil (Post-Remediation)..............4........ 12 3.2 Fate and Transport Analysis.:!................................................................................. 14 3.2.1 Geology.......... ........ ................... .............................................. 14 U 3.2.2 Hydrogeology'..,.,........................................................................................ 14 3.2.3 Plume of Impa6ted'Groundwater............................................................. 15 3.2.4 Petroleum Hydi rocarbon Mass Remaining in Groundwater..................... 16 3.3 Potential Pathway Analysis..: . ...................... 17 4.0 Risk-Based Corrective Action k�!§Yses!'siment................. ......................................................... 18 4.1 Methodology.............................................................................................................. 18 4.2 Results....... .....................:....................................................................................... 19 4.3 Discussion.................... .............................................................................. 20 5.0 Site Closure Criteria..................... ........ ............... ................................................................. 21 5.1 Sources...... ....... .................................................................................. 21 .. .... 5.2 Site Characterization.... .......................................................................I............. 21 5.3 Plume Stability ....... ................................................................................................. .23 5.4 Risk to Sensitive Receptors:..................... ..... ........................................... 23 5.5 Risk to Human Health and Safety............................................................................ 24 6.0 Conclusions and Recommendations.................... .............................................................. 25 U.