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TABLE OF CONTENTS <br /> INTRODUCTION <br /> LOCATION 1' <br /> SITE OWNER 1. <br /> SITE HISTORY 1• <br /> PRELIMINARY ASSESSMENT <br /> INTRODUCTION g• <br /> GEOLOGY AND GROUND WATER OCCURRANCE <br /> Regional Geomorphology and Hydrogeology 9• <br /> Ground water Occurance in the <br /> Stockton Area 10. <br /> Local Geology and Hydrogeology 17 <br /> Well Reconnaissance 17. <br /> SOIL AND GROUND WATER SAMPLE RESULTS 19• <br /> FURTHER ASSESSMENT 19. <br /> STORAGE OF DRILLING CUTTINGS, RINSATE AND <br /> ANY PURGED WATER FROM BORINGS/MONITOR WELLS 36. <br /> HEALTH AND SAFETY 36. <br /> RECOMMENDATIONS 34. <br /> LIMITATIONS 36. <br /> LIST OF FIGURES <br /> 1. AAA AREA LOCATION 3. <br /> 2. USO& TOPOGRAPHIC OF AREA 4. <br /> 2A. USGS--WELL LOCATION 1/2 MILE RADIUS 5. <br /> 3. SITE BASE MAP 6 <br /> 3A. EXCAVATED SOIT. LOCATIONS 12/8/89 7• <br /> 4A. GROUND WATER 4RADIENT 12/11/89 a. <br /> 5A. TPH IN GROUND WATER 12/6/89 20. <br /> 5B. BENZENE IN GROUND WATER 12/6/89 21. <br /> 5C. TOLUENE IN GROUND WATER 12/6/89 22. <br /> 5D. ETHYLRENZRNE IN GROUND WATER 12/6/$9 23. <br /> 5E. XYLENES IN GROUND WATER 12/6/89 Z4. <br /> 6A. TPH IN SOIL 15f DEPTH 25. <br /> 6A-30. TPH IN SOIL 301 DEPTH 26. <br /> 6B. BENZENE IN SOIL 15• DEPTH 27. <br /> 6B-30. BENZENE IN SOIL 300 DEPTH 28. <br /> 6C. TOLUENE IN SOIL 151 DEPTH 29• <br /> 6C-30. TOLUENE IN SOIL 30* DEPTH 30. <br /> 6D. ETHYLSENZENE IN SOIL 15' DEPTH 31. <br /> 6D-30.. ETKYLBENZENE IN SOIL 30f DEPTH 32 <br /> 6E. XYLENES IN SOIL 159 DEPTH 33• <br /> 6E-30' XYLENES IN SOIL 301 DEPTH 34. <br /> 7A. GROUND LEVEL VIEW VAPOR RECOVERY PLATES 38. <br /> 7B. FOUR FOOT LEVEL AERATION TREATMENT PILE 39. <br /> 7C. CROSS SECTION VIEW AERATION TREATMENT PILE 40. <br /> 8. HAND AUGER & VERSADRILL HOLE LOCATIONS 41. <br /> • 2. <br />