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5.5.5.4 Conceptual Site Model................................. ........................................88 <br /> 5.5.5.5 Environmental Investigation........................ ........................................89 <br /> 5.5.5.6 Risk Assessment.......................................... ........................................89 <br /> 5.5.5.7 Risk Management Recommendations.......... ........................................91 <br /> 5.5.6 Septic Tanks................................................................ ........................................91 <br /> 5.5.6.1 History of AOC............................................ ........................................92 <br /> 5.5.6.2 Land Use and Materials Usage.................... ........................................92 <br /> 5.5.6.3 Site Setting/Surroundings............................ ........................................92 <br /> 5.5.6.4 Conceptual Site Model................................ ........................................92 <br /> 5.5.6.5 Environmental Investigation....................... .........................................93 <br /> 5.5.6.6 Risk Assessment......................................... .........................................93 <br /> 5.5.6.7 Risk Management Recommendations......... .........................................94 <br /> 5.5.7 Wash Down Areas...................................................... .........................................94 <br /> 5.5.7.1 History of AOC........................................... .........................................94 <br /> 5.5.7.2 Land Use and Materials Usage................... .........................................94 <br /> 5.5.7.3 Site Setting/Surroundings........................... .........................................94 <br /> 5.5.7.4 Conceptual Site Model................................ .........................................95 <br /> 5.5.7.5 Environmental Investigation....................... .........................................95 <br /> 5.5.7.6 Risk Management Recommendations......... .........................................97 <br /> 5.5.8 Storm Water Retention Ponds.................................... .........................................97 <br /> 5.5.8.1 History of AOC........................................... .........................................98 <br /> 5.5.8.2 Land Use and Materials Usage................... .........................................98 <br /> 5.5.8.3 Site Setting/Surroundings........................... .........................................98 <br /> 5.5.8.4 Conceptual Site Model................................ .........................................98 <br /> 5.5.8.5 Environmental Investigation....................... .........................................98 <br /> 5.5.8.6 Risk Assessment......................................... .........................................98 <br /> 5.5.8.7 Risk Management Recommendations......... .......................................101 <br /> 5.5.9 PCB Storage Areas.................................................... .......................................101 <br /> 5.5.9.1 History of AOC........................................... .......................................101 <br /> 5.5.9.2 Land Use and Materials Usage................... .......................................102 <br /> 5.5.9.3 Site Setting/Surroundings........................... .......................................102 <br /> 5.5.9.4 Conceptual Site Model................................ .......................................102 <br /> 5.5.9.5 Environmental Investigation....................... .......................................102 <br /> 5.5.9.6 Risk Assessment......................................... .......................................102 <br /> 5.5.9.7 Risk Management Recommendations......... .......................................103 <br /> 5.5.10 Groundwater Status....................................... .......................................103 <br /> 5.6 EVALUATION FOR AREAS OF THE FACILITY NOT U ED.................................104 <br /> 5.7 HAZARDOUS WASTE STATUS OF THE FACILITY....... .......................................105 <br /> 6.0 REFERENCES..................................................................................... .......................................107 <br /> Draft <br /> YB61125 workplan-ESC MACTEC Engineering and Consulting, Inc. v <br /> September 28,2005 <br />