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TABLE OF CONTENTS <br /> PROBLEM ASSESSMENT REPORT <br /> Page <br /> EXECUTIVE SUMMARY I <br /> 10 BACKGROUND 4 <br /> 11 Site Location and History 4 <br /> 12 Regional Geology/Hydrogeology 5 <br /> 13 Previous Environmental Studies 6 <br />' 14 Summary of Current Environmental Study 8 <br /> 20 NOVEMBER 1994 INVESTIGATIVE METHODS 10 <br /> 21 Geophysical Survey 10 <br /> 22 Soil Borings 10 <br /> 23 Soil Sampling 10 <br /> 24 Groundwater Monitoring Well Construction 11 <br /> 25 Vapor Extraction Well Construction 12 <br /> 26 Groundwater Well Development 12 <br />' 27 Groundwater Sampling 12 <br /> 28 Analytical Methods 13 <br /> 29 Well Survey 13 <br /> 210 Vapor Extraction Pilot Test 14 <br /> 2 11 Waste Disposal 15 <br />' 3 0 INVESTIGATIVE FINDINGS 16 <br /> 3 1 Geophysical Survey 16 <br /> ' <br /> 32 Site Geology 16 <br /> 3 3 Site Hydrogeology 17 <br /> 34 Soil Sample Analytical Results 17 <br /> 3 5 Groundwater Analytical Results 18 <br /> 3 6 Vapor Extraction Pilot Test 19 <br /> 40 DATA EVALUATION AND DISCUSSION 21 <br /> 4 1 Petroleum Hydrocarbons in Soil 21 <br /> ' <br /> 42 Petroleum Hydrocarbons, MTBE and VOC's in Groundwater 22 <br /> 43 Sources of Soil Impacts 22 <br /> 44 Sources of Groundwater Impacts 23 <br /> 45 Vapor Extraction Pilot Test 25 <br /> i <br />