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I TABLE OF CONTENTS (CONT.) <br />' <br /> 73 IN-SITU BIOREMEDIATION 13 <br /> 73 1 Principles 14 <br /> 732 Nutrient Requirements and Toxicity 14 <br /> 73 3 Inoculation Wells 14 <br /> 734 Monitoring Activities 15 <br /> 7 3 5 Duration 15 <br />' 7 3 6 Feasibility 15 <br /> 7 3 7 Estimated Cost For In-Situ Bioremediation 15 <br /> 74 NATURAL ATTENUATION 16 <br />' 7 4 1 Principles 16 <br /> 7 4 2 Duration 16 <br /> 743 Feasibility 16 <br /> 744 Estimated Costs 17 <br />' 8 0 GROUND WATER REMEDIATION ALTERNATIVES 17 <br /> 8 1 IN-SITU AIR SPARGING 17 <br /> 811 Principles 17 <br />' 8 1 2 Basic System Design 18 <br /> 8 1 3 Monitoring Activities 18 <br /> 814 Feasibility 18 <br /> lie 8 1 5 Duration 19 <br /> 8 16 Cost 19 <br /> 82 GROUND WATER EXTRACTION 20 <br /> 82 1 Basic Principles . 20 <br /> 8 2 2 Treatment Methods 20 <br /> 8 2 3 Feasibility Studies 20 <br /> 8 2 4 Duration 21 <br /> 825 Cost 21 <br /> 83 IN-SITU BIORFMEDIATION/BIOENHANCEMENT 21 <br /> 83 1 Basic Principles 21 <br /> 8 3 2 Nutrient Requirements And Toxicity 22 <br /> 83 3 Monitoring Activities 22 <br /> 8 3 4 Feasibility Studies 22 <br /> 8 3 5 Duration 22 <br /> 8 3 6 Cost 23 <br /> 84 NATURAL ATTENUATION 23 <br /> 8 4 1 Principles 23 <br /> 8 4 2 Duration 23 <br /> 843 Feasibility 24 <br />' 844 Estimated Costs 24 <br />