Laserfiche WebLink
1 <br /> 1SECOR <br /> • I.pI IYYYYYW IqI 11•IIIIYYYIIIYII___. <br /> TABLE OF CONTENTS <br /> ' <br /> 10 INTRODUCTION 1,......... . ... . ...... .. . . . .. . .1 <br /> 20 SITE HISTORY . .. . ....... .. .. . ......... . .. . .. .. . . .2 <br /> 21 Background 2 <br /> ' 2 2 Previous Investigations 2 <br /> 23 Supply Well Survey 4 <br /> 24 Summary of Remedial Action 4 <br /> 30 CURRENT ASSESSMENT ACTIVITIES <br /> .... ........ ... .. .. . .................. ... . . .5 <br /> ' <br /> 40 GEOLOGIC AND HYDROGEOLOGIC SETTINGS .. .. .. . .... ... . 6 <br /> 60 PETROLEUM HYDROCARBON DISTRIBUTION AND CONCENTRAITON TRENDS . ..7 <br /> 5 1 Distribution of Petroleum Hydrocarbons Soil 7 <br /> 51 1 Distribution of Hydrocarbons in Sod 7 <br /> 5 1 1 1 Lateral Distribution of Hydrocarbons in Shallow Soil 7 <br /> 5 1 1 2 Lateral Distribution of Hydrocarbons in Deep Soil 7 <br /> ' 5 1 1 3 Vertical Delineation of Hydrocarbons in Soil 7 <br /> 52 Petroleum Hydrocarbons in Groundwater 7 <br /> 5 2 1 Lateral Distribution of TPI-Ig in Shallow and Deep Groundwater 7 <br /> 1 1 5 2 1 1 Shallow Groundwater 7 <br />} 5 2 1 2 Deep Groundwater 8 <br /> 5 2 2 Lateral Distribution of Benzene in Shallow and Deep Groundwater 8 <br /> . 5 2 2 1 Shallow Groundwater 8 <br /> 5 2 2 2 Deep Groundwater 8 <br /> 5 2 3 Lateral Distribution of MtBE in Shallow and Deep Groundwater 8 <br /> 5 2 3 1 Shallow Groundwater 8 <br /> 1 5 2 3 2 Deep Groundwater 9 <br /> 524 Lateral Distribution of 1,2-DCA in Shallow and Deep Groundwater 9 <br /> 5 2 4 1 Shallow Groundwater 9 <br /> ' 5 2 4 2 Deep Groundwater 9 <br /> 5 2 4 3 Vertical Delineation of Hydrocarbons in Groundwater 9 <br /> 53 Dissolve Concentration Trends 10 <br /> ' 5 3 1 Shallow Zone Trends 10 <br /> 5 3 2 Deep Zone Trends 10 <br /> 6 0 ARCO STATION 4932, 16 E HARDING WAY, STOCKTON .. .. .. ... 11 <br /> ' <br /> 61 Soil Vapor and Groundwater Extraction 11 <br /> 6 1 1 Soil Vapor Extraction 11 <br /> 6 1 2 Groundwater Extraction System 11 <br /> 6 1 3 Groundwater Batch Extraction 11 <br /> 6 1 4 Future Remedial Expansion at ARCO 4932 11 <br /> 7 0 CONCLUSIONS. . ...................... . . . ................ ... .... . 12 <br /> 8 0 REFERENCES ... . .... . . . . . .............. . . .... ....... .14 <br /> 1 ATTACHMENT E FIELD AND LABORATORY PROCEDURES . .... .... 21 <br /> Exploratory Drilling 21 <br /> Organic Vapor Procedures 21 <br /> ' TABLES . .. ............ .. .. ............. .. .... . ... <br /> ...23 <br /> 22 <br /> FIGURES.... . . .. ,. ... .. . . ........ <br /> i <br /> Updated SCM doe I August 13,2004 <br /> ' 77CP 64409 05 0005 <br />