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TABLE OF CONTENTS <br /> E i <br /> t.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 <br /> 1.1 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 <br /> 2.0 BACKGROUND INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 <br /> 2.1 Site Background and Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 <br /> 2.2 Regional Geology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 <br /> 2.3 Regional Hydrogeology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 <br /> 2.4 Local Water Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 <br /> 2.5 Initial Soil and Ground Water Investigations . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 <br /> 2.6 Tank Removal Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 <br /> 2.7 Overexcavation Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 <br /> 2.8 Additional Soil Borings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 <br /> 2.9 Ground Water Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 <br /> 3.0 DISTRIBUTION OF PETROLEUM HYDROCARBONS IN SOIL 8 <br /> 4.0 DISTRIBUTION OF PETROLEUM HYDROCARBONS IN GROUND WATER . . . . . . . 10 <br /> 4.1 Total Petroleum Hydrocarbons as Gasoline . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 <br /> 4.2 Benzene . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 <br /> 5.0 MONITORING WELL MW-5 EVALUATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 <br /> 5.1 Overpurging Monitoring Well MW-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 <br /> I 5.2 Pumping Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 <br /> . . . . . . . . . . . . . . . . . . . <br /> 5.3 Soil Vapor Extraction (SVE) On Monitoring Well MW-5 12 <br /> 6.0 BIODEGRADATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 <br /> 7.0 RATIONALE FOR CLOSURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 <br /> 8.0 REMARKS/SIGNATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 <br /> Tables <br /> TABLE 1 Soil Sample Analytical Results from Drilling Activities <br /> TABLE 2 Ground Water Level Data <br /> TABLE 3 Ground Water Analytical Results <br /> TABLE 4 Soil Sample Analytical Results From UST and Product Line Excavation Activities <br /> TABLE 5 Soil Sample Analytical Results From Used Oil Tank Excavation Activities <br /> TABLE 6 Estimation of Hydrocarbons Removed by Excavation, March 8, 1996 <br /> TABLE 7 SVE Pilot Test Soil Vapor Sample Results <br /> TABLE 8 SVE Pilot Test Vacuum Influence <br /> TABLE 9 Summary Of Mass Flow Rate And Induced Vacuums <br /> 1 , <br /> i <br />