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0 <br /> TABLE OF CONTENTS <br /> 1.0 INTRODUCTION ...... .. ..... .. .... ..... .. .. .. . .... .... . ... . .. ...... .. ... ..........1 <br /> 2.0 SITE HISTORY. ...... .. ..... . .... .... .. . .. . .... ..... ......... ........... .. ..... ....... ... 2 <br /> 21 Site Location 2 <br /> 22 Previous Investigations 2 <br /> 2 2 1 Chevron 9-4275 Facility 2 <br /> 2 2 3 ARCO 2133 Facility 3 <br /> 23 Supply Well Survey 4 <br /> 24 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 6 <br /> 3 2 Soil Sample Analytical Results 7 <br /> 4.0 CURRENT ASSESSMENT ACTIVITIES AND RESULTS..... .. .. ... . ..... ...... 8 <br /> 4 1 Chevron 9-4275 Sod Bonngs and Replacement Monitoring Wells 8 <br /> 4 2 ARCO 2133 Soil Borings 9 <br /> 5.0 GEOLOGIC AND HYDROGEOLOGIC SETTINGS.. . ...... .. ... .. .. 10 <br /> 51 Geology 10 <br /> 5 2 Hydrogeology 10 <br /> 6.0 PETROLEUM HYDROCARBON DISTRIBUTION AND CONCENTRATION TRENDS .. 11 <br /> 61 Distribution of Petroleum Hydrocarbons in Soil 11 <br /> 6 1 1 Lateral Distribution of Hydrocarbons in Shallow Soil 11 <br /> ,t 6 1 2 Vertical Delineation of Hydrocarbons in Sod 11 <br /> 62 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 /> 100 REFERENCES.. .. ....... ... .. . . .... . .. . .. . ... . . . 16 <br /> 94275-ARCO 2133 SCM 9-2006 I <br />