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QUARTERLY MONITORING REPORT <br /> ' FIRST QUARTER OF 2007 <br /> MORTON-ALCO & UNOCAL OPERABLE UNITS <br /> TABLE OF CONTENTS <br /> 1.0 INTRODUCTION <br /> 2.0 PURPOSE """"""' 1 <br /> 3.0 SITE BACKGROUND....................................................................................................... <br /> 3.1 Site Location and Description................................................................................. 2 <br /> 3.1.1 Unocal OU.................................................................................................. 2 <br /> 3.1.2 Morton-Alco OU 2 <br /> . ....................................................................... <br /> 3.2 Site History............................................................................................................. 3 <br /> 4.0 MONITORING AND SAMPLING.................................................................................... 3 <br /> ' 4.1 Groundwater Monitoring •• 3 <br /> 4.2 Groundwater Sampling........................................................................................... 4 <br /> 4.3 Investigation-Derived Waste .................................................................................. 5 <br /> 5.0 RESULTS OF MONITORING AND SAMPLE ANALYSIS ........................................... 5 <br /> 5.1 Site Groundwater Conditions.................................................................................. 5 <br /> 5.2 Results of Laboratory Analysis............................................................................... 6 <br /> 5.3 Data Quality............................................................................................................ 8 <br /> 6.0 SUMMARY........................................................................................................................ 9 <br /> 6.1 Groundwater Flow Trends...................................................................................... 9 <br /> 6.2 Chemical Concentration Trends ............................................................................. 9 <br /> Figures: <br /> 1 Vicinity Map <br /> 2 Site Plan <br /> 3 Potentiometric Surface Map <br /> 4 TPHd Concentration Map <br /> 5 TPHmo Concentration Map <br /> 6 TPHg Concentration Map <br /> 7 Benzene Concentration Map <br /> 1 8 MTBE Concentration Map <br /> 9 TPHd, TPHmo, TPHg, and Groundwater Elevations in MW6 <br /> 10 TPHd, TPHmo, TPHg, and Groundwater Elevations in MW 11 <br /> Tables: <br /> 1 Summary of Well Construction Details <br /> 2 Summary of Groundwater Elevation Data <br /> 3 Summary of Analytical Results—Diesel and Gasoline Range Compounds <br /> 4 Summary of Analytical Results—Volatile and Semi-Volatile Organic Compounds <br /> ' 5 Summary of Analytical Results—Metals <br /> Appendices: <br /> A Well Development/Sampling Purge Data <br /> i B Laboratory Analytical Reports <br />