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TABLE OF CONTENTS <br />' Section Pa e <br />' 6 0 CONCLUSIONS AND RECOMMENDATIONS 6-1 <br /> 61 CONCLUSIONS 6-1 <br />' 6 2 RECOMMENDATIONS 6-2 <br /> 70 LIMITATIONS 7-1 <br /> 80 REFERENCES 8-1 <br /> LIST OF TABLES <br /> 3-1 Summary of Soil Analytical Results, 1989-1992 <br /> 3-2 Summary of Soil Analytical Results, 1995-1996 <br /> 3-3 Histoncal Groundwater Elevation and Analytical Data <br /> 5-1 Results of Vertical Groundwater Sampling and Analysis —General Minerals and Water <br />' Quality Parameters <br /> 5-2 Results of Vertical Groundwater Sampling and Analysis —TPH-g, BTEX, and MTBE <br /> 5-3 Slug Test Results <br /> 5-4 Estimated Mass of TPH-g and Benzene in Soil <br /> 5-5 Estimated Mass of TPH-g and Benzene in Groundwater <br /> rLIST OF FIGURES <br /> 1-1 Caltrans Stockton Yard Maintenance Station <br /> 1-2 Site Plan <br /> 2-1 Site Plan with Geologic Cross Section Orientation <br />' 2-2 Generalized Geologic Cross Section B-B' <br /> 2-3 Generalized Geologic Cross Sections A-A' and B-B' <br /> 2-4 Generalized Geologic Cross Section D-D' <br /> 5-1 Vertical Groundwater Sampling Results (April 1999) <br /> 5-2 Groundwater Elevation Contour Map (April 1999) <br /> 5-3 Discrete Sampling Results and Quarterly Monitoring Results (April 1999) —TPH-g, <br /> Benzene and MTBE <br /> 5-4 Historical Trends in TPH-g and Benzene Concentrations and Groundwater Elevations in <br /> Wells MW-1, MW-6, VW-1, and VW-2 <br /> 5-5 Estimated Areal Extent of TPH-g Concentrations in Soil X10 gg/kg with Depth <br /> 5-6a Estimated Areal Extent of Benzene Concentrations in Soil X10 µg/kg with Depth (21-40') <br /> 5-6b Estimated Areal Extent of Benzene Concentrations in Soil X10 µg/kg with Depth (41-70') <br />' 5-7 Estimated Areal Extent of TPH-g and Benzene in Groundwater with Depth <br /> S 1PROJ1410MIOO ISYYARDMAINTYARDSA.DOC 11 URS Greiner Woodward Clyde <br />