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CONTENTS <br />' INTRODUCTION 1 <br /> i' SITE DESCRIPTION 2 <br /> SITE LOCATION AND TOPOGRAPHY 2 <br /> Hydrogeologic Framework 2 <br /> BACKGROUND 3 <br /> 1987 to 1994 Investigations 3 <br /> RAH Investigations 3 <br /> SECOR Investigation 4 <br /> HLA Investigations 4 <br /> Supplemental Site Investigation—Phase One 4 <br /> Preliminary Results SSI---Phase One 5 <br />' SITE CONDITIONS 7 <br /> Soil Profile 7 <br /> ' Groundwater Gradient and Flow Directions 7 <br /> Groundwater Analytical Data 7 <br /> Soil Analytical Data 8 <br /> FIELD INVESTIGATION SSI-PHASE ONE 9 <br /> Soil Borings and Soil and Hydropunch Groundwater Sampling 9 <br /> Analytical Program 1 l <br /> RESULTS OF INVESTIGATION SSI -PHASE ONE 12 <br /> Subsurface Conditions- Soil Profile 12 <br /> Analytical Results- Soil Samples 12 <br /> Analytical Results—Hydropunch Groundwater Grab Samples 12 <br /> ' Results of Insitu Bioremediation Feasibility Studies 13 <br /> FIELD INVESTIGATION SSI- PHASE TWO 14 <br /> ' Monitoring Well Boring and Soil Sampling 14 <br /> Monitoring Well Construction 14 <br /> Initial Monitoring Well Development,Purging and Sampling 15 <br /> ' Additional Well Development and Second Purge and Sample of Well MW-7 15 <br /> Final Purge and Sample Event of All Monitoring Wells 15 <br /> Lopez Irrigation Well Sampling 16 <br /> ' RESULTS OF INVESTIGATION SSI-PHASE TWO 17 <br /> Subsurface Conditions- Soil Profile 17 <br /> Analytical Results- Soil Samples 17 <br /> Analytical Results—Monitoring Well MW-7 17 <br /> Final Monitoring Round Results 17 <br /> Lopez Imgation Well Sampling 17 <br /> L 1300001387371WP138737N19 Harding Lawson Associates ii <br />