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16 Jonas & Associates Inc <br /> ' Request For Closure <br /> of an Underground Gasoline Storage Tank Formerly Located at <br /> ' Pacific Gas & Electric's Tracy Service Center <br /> 502 East Grant Line Road, Tracy, California <br /> September 1996 <br /> ' TABLE OF CONTENTS <br /> PAGE <br /> LIST OF FIGURES n <br /> ' LIST OF TABLES 111 <br /> ' LIST OF WELL LOGS 111 <br /> 1.0 INTRODUCTION 1 <br /> 1 1 Site Information 1 <br /> 2.0 INVESTIGATIVE METHODS 2 <br /> 21 Soil Vapor Assessment 2 <br /> 22 Soil Investigation 3 <br /> 23 Groundwater Investigation 4 <br /> 2 3 1 Groundwater Monitoring Well Design, Installation, and <br /> Development 4 <br /> 232 Groundwater Sampling Methodology 5 <br /> ' 2 3 3 Method Used to Measure Free Product Thickness 6 <br /> 234 Method Used to Measure Groundwater Elevations 6 <br /> 24 Analytical Methods 6 <br /> ' 2 4 1 Soil Samples Analytical Methods 6 <br /> 2 4 2 Groundwater Samples Analytical Methods 7 <br /> ' 3.0 EXTENT OF HYDROCARBON PRESENCE IN SOILS AND <br /> GROUNDWATER 7 <br /> ' 3 1 1986 Investigations 7 <br /> 3 1 1 TPH-G - 1986 Analytical Results 7 <br /> 3 1 2 BTEX - 1986 Analytical Results 8 <br /> 3 1 3 Lead - 1986 Analytical Results 8 <br /> 3 1 4 EDB and 1,2-DCA - 1986 Analytical Results 8 <br /> 32 1987 Through 1988 Investigations 8 <br /> 3 2 1 TPH-G - 1988 Analytical Results 10 <br /> ' 1 <br />