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1 ' Quarterly Report - Third and Fourth Quarters 2005 CHAPIN BROTHERS INVESTMENTS,INC. ' 1766 Monte Diablo Avenue, Stockton, California TABLE OF CONTENTS SECTION PAGE ' 1.0. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ' 2.0. PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 1 QUARTERLY GROUND WATER MONITORING AND SAMPLING 1 ' 21 1 Low-Flow Well Monitoring and Ground Water Sample Collection and Analysis 1 1 3.0. FINDINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 31 GROUND WATER ELEVATION AND GRADIENT 2 3 1 1 10 August 2005 2 ' 3 12 25 October 2005 2 32 ANALYTICAL RESULTS FROM GROUND WATER SAMPLES 3 3 2 1 10 August 2005 3 ' • 3 2 2 25 October 2005 4 3 2 3 Natural Attenuation - Geochemical and Geophysical Results 4 3 3 GEOTRACKER CONFIRMATIONS 5 ' 4.0. SUMMARY AND CONCLUSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 ' 5.0. RECOMMENDATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6.0. LIMITATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 ' FIGURES Figure 1 - Location Map ' Figure 2 -Site Plan Figure 3 - Ground Water Elevation Map - 10 August 2005 Figure 4 - Ground Water Elevation Map - 25 October 2005 Figure 5 - Dissolved Contamination -Benzene - 10 August 2005 ' Figure 6 -Dissolved Contamination -Benzene - 25 October 2005 Figure 7 - Dissolved Contamination - TPH-Gasoline - 10 August 2005 ' Figure S - Dissolved Contamination - TPH-Gasoline - 25 October 2005 i Advanced CcoEnvironmental,Inc