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i <br /> TABLE OF CONTENTS <br /> 1.0 INTRODUCTION....... ............................. ............. ...... .........................................1 <br /> 2.0 SITE HISTORY....... .................................................................. ................................. 2 <br /> 2.1 Site Location..............:............................................................................................... 2 <br /> 2.2 Previous Investigations............................................................................................. 2 <br /> 2.2.1 Chevron 9-4275 Facility ................................................................................ 2 <br /> 2.2.3. ARCO 2133 Facility.....................................................................................1. 3 <br /> 2.3. Supply Well Survey................................................................,.:................................ 4 <br /> 2.4. Summary of Remedial Actions................................ .................. 4 <br /> 2.4.1 Chevron 9-4275 Facility ._.............................................................................. 4 <br /> 2.4.2 ARCO 2133 Facility....................................................................................... 5 <br /> 3.0 UST REMOVAL -CHEVRON ........................................................................................... 6 <br /> 3:1 Soil Sample Collection.................................:........................................... <br /> 3.2 Soil Sample Analytical Results.................................................................................. 7 <br /> 4.0 CURRENT ASSESSMENT ACTIVITIES AND RESULTS................................................. 8 <br /> 4.1 Chevron 9-4275 Soil Borings and Replacement Monitoring Wells ............................ 8 <br /> 4.2 ARCO 2133 Soil Borings .......................................................................................... 9 <br /> 5.0 GEOLOGIC AND HYDROGEOLOGIC SETTINGS...........:.......................:......................10 <br /> 5.1 Geology...................................................................................................................10 <br /> 5:2 Hydrogeology...............................................................................:..........................10 <br /> 6.0 PETROLEUM HYDROCARBON DISTRIBUTION AND CONCENTRATION TRENDS ...11 <br /> 6.1 Distribution of Petroleum Hydrocarbons in Soil................:.......................................11 <br /> 6.1.1 Lateral Distribution of Hydrocarbons in Shallow Soil ............:.......................11 <br /> 6.1.2 Vertical Delineation of Hydrocarbons in Soil.,.... <br /> ...........................................11 <br /> 6.2 Petroleum Hydrocarbons in Groundwater................................................................11 <br /> 6.2.1 Lateral Distribution of TPHg in Groundwater................................................11 <br /> 6.2.2 Lateral Distribution of Benzene in Groundwater.......:...................................12 <br /> 6.2.3 Lateral Distribution of MtBE in Groundwater.................................................12 <br /> 6.2.4 Vertical Delineation of Hydrocarbons in Groundwater.......:..........................12 <br /> 7.0 POTENTIAL EXPOSURE PATHWAYS AND SENSITIVE RECEPTORS........................13 <br /> 8.0 CONCLUSIONS AND RECOMMENDATIONS.......................:........................................14 <br /> 9.0 LIMITATIONS.....................................................:............................................................15 <br /> 10.0 REFERENCES................................................................................................................:.16 j <br /> i <br /> I <br /> i <br /> 1 <br /> 94275-ARCO 2133 SCM 9-2006 j <br /> I <br />