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r <br />TABLE OF CONTENTS <br />Pte._ <br />ILLUSTRATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . <br />iv <br />TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <br />v <br />' <br />1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . <br />1 <br />1.1 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . <br />1 <br />' <br />1.2 Background . . . . . . . . . . . . . . . . . . . . . . . <br />1 <br />1.2.1 Site history . . . . . . . . . . . . . . . . . . . <br />1 <br />1.2.2 Previous investigations <br />2 <br />. . . . . . . . . . . . . <br />' <br />2.0 SITE DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . <br />3 <br />2.1 Site Location . . . . . . . . . . . . . . . . . . . . . . <br />3 <br />2.2 Site Geology . . . . . . . . . . . . . . . . . . . . . . <br />3 <br />2.3 Site Hydrogeology . . . . . . . . . . . . . . . . . . . . <br />5 <br />3.0 SCOPE OF WORK <br />6 <br />. . . . . . . . . . . . . . . . . . . . . . . . <br />4.0 OBJECTIVES AND METHODOLOGY . . . . . . . . . . . . . . . . <br />7 <br />4.1 Preliminary Field Work . . . . . . . . . . . . . . . . . <br />7 <br />4.2 Define the Vertical and HorizontalDistribution <br />of Gas Plant Residues • <br />7 <br />4.2.1 Define the vertical and horizontal distribution <br />of gas plant residues in soils within the site <br />property boundaries . . . . . . . . . . . . . . . <br />8 <br />4.2.2 Define the vertical and horizontal distribution <br />of gas plant residues in the uppermost aquifer <br />around the site perimeter . . . . . . . . . . . . <br />12 <br />4.3 Identify the Chemical Composition of the Gas Plant <br />Residues. . . . . . . . . . . . . . . . . . . . . . . . <br />18 <br />4.3.1 Analyze the chemical composition of soil samples <br />collected from 31 borings . . . . . . . . . . . . <br />18 <br />4.3.2 Analyze the chemical composition of groundwater <br />samples collected from the six existing and <br />four proposed monitoring wells . . . . . . . . . . <br />21 <br />3542a/BAV102 i <br />