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Table of Contents <br /> Section f <br /> 1.0 Introduction ..........................................................................................................1 <br /> 1.1 Apparent Problem .....................................................................................1 <br /> 2.0 Site Description.....................................................................................................3 <br /> 2.1 Site Location...............................................................................................3 <br /> 2.2 Site Description..........................................................................................3 <br /> 2.3 Operational History....................................................................................3 <br /> 2.4 Regulatory Involvement..............................................................................7 <br /> 3.0 Investigative Efforts..............................................................................................10 <br /> 3.1 Previous Sampling....................................................................................10 <br /> 3.1.1 Anderson Geotechnical Sampling............................................•••• 10 <br /> 3.1.2 Cal EPA DTSC Sampling............................................................... <br /> 3.1.3 Kleinfelder Sampling ....................................................................11 <br /> 3.2 EPA Sampling...........................................................................................11 <br /> 3.2.1 Purpose and Description of Sampling Event.................................. 11 <br /> 3.2.2 Discussion of Sampling Results.....................................................13 <br /> 4.0 Hazard Ranking System Factors ................•.........................................................15 <br /> 4.1 Sources of Contamination.........................................................................15 <br /> 4.2 Groundwater Pathway..............................................................................15 <br /> 4.2.1 Hydrogeologic Setting ................................................................. <br /> 4.2.3 Groundwater Conclusions ............................................................15 <br /> 4.3 Surface Water Pathway.............................................................................15 <br /> 4.4 Soil Exposure and Air Pathways................................................................15 <br /> 5.0 Emergency Response Considerations...................................................................16 <br /> 6.0 Summary .............................................................................................................17 <br /> 7.0 EPA Recommendation.........................................................................................19 <br /> 8.0 References..........................................................................................................20 <br /> URS Consultants, Inc. ARCS EPA Region DC <br /> Contract No.68-W9-0054 WA No. 54-27-9JZZ <br />