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Table of Contents <br /> 1.0 INTRODUCTION ..................................................................................................................................... 1 <br /> 2.0 SITE BACKGROUND.............................................................................................................................. 1 <br /> 2.1 Site Location and Description........................................................................................................... 1 <br /> 2.2 Historical and Current Site Use.........................................................................................................2 <br /> 2.3 Geology and Hydrogeology..............................................................................................................2 <br /> 2.4 Previous Releases............................................................................................................................3 <br /> 2.5 Previous Investigations.....................................................................................................................4 <br /> 2.6 Remedial Actions..............................................................................................................................9 <br /> 2.7 Cleanup Plan and Addendum to Cleanup Plan .............................................................................. 10 <br /> 3.0 NATURE AND EXTENT OF PETROLEUM HYDROCARBONS............................................................ 11 <br /> 3.1 Soil.................................................................................................................................................. 12 <br /> 3.2 Groundwater................................................................................................................................... 12 <br /> 4.0 CONCEPTUAL SITE MODEL................................................................................................................ 13 <br /> 4.1 Physical Model................................................................................................................................ 14 <br /> 4.2 Exposure Pathway Analysis............................................................................................................ 14 <br /> 5.0 REVISED CLEANUP PLAN................................................................................................................... 16 <br /> 5.1 Cleanup Goals................................................................................................................................ 16 <br /> 5.2 Evaluation of Remedial Technologies.............................................................................................. 18 <br /> 5.3 Selected Approach and Rationale to Achieve Cleanup Goals........................................................ 21 <br /> 5.4 Scope of MNA Plan ........................................................................................................................ 21 <br /> 6.0 REFERENCES......................................................................................................................................23 <br /> Tables <br /> 1 Monitoring Well Construction Details <br /> 2 Groundwater Elevation and Product Thickness Data—Third Quarter 2012 <br /> 3 Recent Groundwater Analytical Results <br /> 4 Monitored Natural Attenuation Parameters—2007 <br /> 5 TPHd Concentration Comparison <br /> 6 Contaminants of Potential Concern <br /> 7 Proposed Groundwater Monitoring Program <br /> Revised Cleanup Plan Page i <br /> NuStar Stockton Terminal-Stockton,California <br /> November 7,2012 <br /> 1014-12 <br />