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ENSR AECOM <br /> Contents <br /> 1.0 Introduction and context.........................................................................................................................1-1 <br /> 2.0 Site status..................................................................................................................................................2-1 <br /> 2.1 Site location and description...........................................................................................••...............2-1 <br /> 2.2 Site history........................................................................................................................................2-1 <br /> 3.0 Conceptual model and extent of contaminant impact........................................................................3-1 <br /> 3.1 Geology and hydrogeology...............................................................•..............................................3-1 <br /> 3.1.1 Geology.... .....................................................................................................................3-1 <br /> 3.1.2 Hydrogeologygy. .3-1 <br /> 3.2 Contaminant distribution in soil .......................................................................................................3-2 <br /> 3.3 Contaminant distribution in groundwater........................................................................................3-2 <br /> 3.4 Groundwater concentration trends..................................................................................................3-3 <br /> 3.5 Biodegradation parameters.............................................................................................................3-3 <br /> 3.6 Ozone sparging system operational status.....................................................................................3-4 <br /> 1 3.7 Data gaps and recommended activities..........................................................................................3-4 <br /> 4.0 Regulatory requirements.........................................................................................................................4-1 <br /> 4.1 Cleanup criteria objectives ..............................................................................................................4-1 <br /> 5.0 Conclusions and recommendations......................................................................................................5-1 <br /> 5.1 Status of response actions......................................................................................................•.......5-1 <br /> 5.2 Implications of the conceptual site model.......................................................................................5-1 <br /> 5.3 Existing remedial system.........--•.....................................................................................................5-1 <br /> 5.4 Recommendations for further assessment.....................................................................................5-2 <br /> 6.0 References.................................................................................................................................................6-1 <br /> Appendix A Mann-Kendall Statistical Test <br /> J:1Rem_Eng\Pr01ed Files11360(6000- I January 2006 <br /> 6999)\6940-UNOCAL Portfolio Closure16940- <br /> UNOCAL Portfolio Closure\Site 0167-Stockton <br /> East Minor%CSM Report\CSM Report_Final.doc <br />