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Table of Contents <br /> i Pa>ze <br /> 1.0 Introduction .......... .......»..........................................................................»....1 <br /> 1.1 apparent Problem ..................................................................................... 1 <br /> 2.0 Site Q7escription.........................»..........................................................................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 DISC Sampling...............................................................10 <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 .......s»..»es....••..«...s..............»e.»s..................15 <br /> 4.1 Sources of Contamination.........................................................................15 <br /> 4.2 Groundwater Pathway..............................................................................15 <br /> 4.2.1 Hydrogeologic Setting..........:....................................................... 15 <br /> 4.2.3 Groundwater Conclusions ............................................................15 <br /> 4.3 Surface Water Pathway............................................................................. 15 <br /> 4.4 Soil Exposure and Air Pathways............................................................... <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, lam. ARCS EPA Region Ix <br /> Comma No.68-V9-4054 WA No. 54-27-93ZZ <br />