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41, <br /> TABLE OF CONTENTS (Continued) <br /> t <br /> 8 2 1 Excavation 19 <br /> 8 2 2 Feasibility of Excavation 19 <br /> 8 2 3 Estimated Costs for Excavation 19 <br /> 83 IN-STI'UBIOREMEDIATION 20 <br /> $3 1 Principles 20 <br /> 8 3 2 Nutrient Requirements and Toxicity 20 <br /> 8 3 3 Inoculation Wells 21 <br /> 834 Monitoring Activities 21 <br /> 8 3 5 Duration 21 <br /> 8 3 6 Feasibility 22 <br /> 8 3 7 Estimated Costs for In-Situ Bioremediation 22 <br />' 8 4 NATURAL ATTENUATION 22 <br /> 8 4 1 Principles 22 <br /> 8 4 2 Duration 23 <br />' <br /> 843 Feasibility 23 <br /> 844 Estimated Cost 23 <br /> 9 0. GROUND WATER REMEDIATION ALTERNATIVES 23 <br /> 91 IN-SITU AIR SPARGING 24 <br /> 91 1 Principles 24 <br /> 9 1 2 Basic System Design 24 <br /> 9 1 3 Monitoring Activities 25 <br /> 9 1 4 Feasibility 25 <br /> 9 1 5 Duration 25 <br /> 9 16 Cost 26 <br /> 9 2 GROUND WATER EXTRACTION 26 <br /> I 9 2 1 Treatment Methods 26 <br /> 9 2 2 Feasibility Studies 27 <br /> 9 2 3 Duration 27 <br />' 9 2 4 Cost 27 <br /> 9 3 IN--SITU BIOREMEDIATIONBIOENHANCEMENT 27 <br /> 9 3 1 Nutrient Requirements and Toxicity 28 <br /> 9 3 2 Monitoring Activities 28 <br />' 9 3 3 Feasibility Studies 28 <br /> 9 3 4 Duration 28 <br /> 9 3 5 Cost _ 29 <br />' 9 4 NATURAL ATTENUATION 29 <br /> 9 4 1 Principles _ _ 29 <br /> 9 4 2 Duration 30 <br />' 9 4 3 Feasibility 30' <br /> 9 4 4 Estimated Costs 30 <br />' 10 0 RECOMMENDATIONS 30 <br /> 10 1 REMEDIATION OF HYDROCARBON-IMPACTED SOIL 31 <br /> 10 2 REMEDIATION OF HYDROCARBON-IMPACTED GROUND WATER 31 <br /> 110. LIMITATIONS 33 <br />' Advanced GeaErn ironmentei,Inc <br />