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I <br /> TABLE OF CONTENTS <br /> Pale <br /> 1 INTRODUCTION................... ....................... ............. ...... ....................................... ..1 <br /> 1 1 Site Description 1 <br /> 12 Former Underground Storage Tanks and Previous Work 1 <br /> 1 3 Historic Groundwater Conditions 2 <br /> 14 Natural Biodegradation of Petroleum in Groundwater 3 <br /> 1 5 Historic Soil Conditions 4 <br /> 2 MAY 1999 SUBSURFACE INVESTIGATION5 <br /> .......................................................... <br /> 21 Investigation Procedures 5 <br /> 22 Sample Analytical Results 5 <br /> 23 Water Well Survey 6 <br /> 3 HYDROGEOLOGY ........................ .. ......... . .................... ........................................ .S <br /> 4 MAY 1999 GROUNDWATER MONITORING.. ........... ...... ............. ........... ..........9 <br /> 41 Groundwater Elevation Data 9 <br /> 42 Groundwater Sample Analytical Data 9 <br /> 5 SUMMARY OF MAY 1999 WORK............................ ...............................................11 <br /> 51 Extent and Magnitude of Impact 11 <br /> e <br /> 52 Associated Health Risks 12 <br /> 5 3 Natural Attenuation 12 <br /> 6 REMEDIAL OPTIONS........................... ....................................................................13 <br /> 61 Air Sparging and Soil Venting 13 <br /> 62 Natural Attenuation 13 <br /> 63 Recommendation 14 <br /> List of Tables <br /> List of Figures <br /> APPENDIX 1 Public Water Well Survey <br /> APPENDIX 2 Cone Penetrometer Testing Data <br /> APPENDIX 3 Groundwater Monitoring Sampling Procedures <br /> APPENDIX 4 Laboratory Analytical Reports <br /> APPENDIX 5 TPH-G Mass Calculation <br /> May 1999 Subsurface Investigation and Groundwater Monitoring Report <br /> The Earthgrams Company Facility <br /> 2651 South Airport Way <br /> Stockton,California <br /> Prepared for THE EARTHGRAINS COMPANY Prepared by Philip Services Corp <br /> E II213M121362EG\t25997505"REP DOC June 22, 1999 <br /> tl <br />