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TABLE OF CONTENTS (Continued) <br /> x <br />' <br /> 72 EX-SITU TREATMENT OF IMPACTED SOIL 15 <br /> 7 2 1 Excavation 15 <br /> 7 2 2 Feasibility of Excavation 15 <br />' 7 2 3 Estimated Costs for Excavation 16 <br /> 73 IN-SITU BIOREMEDIATION 16 <br /> 73 1 Principles 16 <br /> 7 3 2 Nutrient Requirements and Toxicity 17 <br /> 7 3 3 Inoculation Wells 17 <br /> 734 Monitoring Activities 17 <br />' 7 3 5 Duration 18 <br /> 7 3 6 Feasibility 18 <br />' 7 3 7 Estimated Costs for In-Situ Bioremediation 18 <br /> 74 NATURAL ATTENUATION 18 <br /> 7 4 1 Principles 19 <br />' 7 4 2 Duration 19 <br /> 7 4 3 Feasibility 19 <br /> 744 Estimated Costs 20 <br /> 8 0 GROUND WATER REMEDIATION ALTERNATIVES 20 <br /> 8 1 IN-SITU AIR SPARGING 20 <br />' 811 Principles 20 <br /> 8 1 2 Basic System Design 20 <br /> 8 1 3 Monitoring Activities 21 <br />' 814 Feasibility 21 <br /> 815 Duration 22 <br /> 816 Cost 22 <br />' 82 GROUND WATER EXTRACTION 22 <br /> 82 1 Basic Principles 22 <br /> 8 2 2 Treatment Methods 23 <br /> 8 2 3 Feasibility Testing 23 <br /> 8 2 4 Duration 23 <br />' 8 2 5 Cost 24 <br /> 83 IN-SITU BIOREMEDIATION/BIOENHANCEMENT 24 <br /> 83 1 Basic Principles 24 <br /> 8 3 2 Nutrient Requirements and Toxicity 24 <br /> 83 3 Monitoring Activities 24 <br /> 8 3 4 Feasibility Studies 25 <br />' <br /> 83 5 Duration 25 <br /> 83 6 Cost 25 <br /> n r ' <br /> 84 NATURAL ATTENUATION <br /> 8 4 1 Principles 26 <br /> . 8 4 2 Duration 26 <br />