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TABLE OF CONTENTS (Continued) <br />' 6 3 7 ESTIMAJED COSTS FOR IN-Sll UBIOREMEDIATION 12 <br /> 64 NATURAL ATTENUATION 12 <br />' 6 4 1 PRINCIPLES 13 <br /> 6 4 2 DURATION 13 <br />' 6 4 3 FEASIBILITY 13 <br /> 6 4 4 ESTIMATED COSTS 13 <br />' 7 0 GROUND WATER REMEDIATION ALTERNATIVES 14 <br /> 7 1 IN-SITU AIR SPARGING 14 <br /> 711 PRINCIPLES 14 <br />' 7 1 2 BASIC SYSTEM DESIGN 14 <br /> 7 1 3 MONITORING ACTIVITIES 15 <br /> 714 FEASIBILITY 15 <br /> 715 DURATION 15 <br /> 7 1 6 COST 15 <br /> 72 GROUND WATER EXTRACTION 16 <br /> 7 2 1 BASIC PRINCIPLES 16 <br /> 7 2 2 TREATMENT METHODS 16 <br /> . 7 2 3 FEASIBILITY TESTING 16 <br /> 7 2 4 DURATION 17 <br /> 7 2 5 COST 17 <br /> 73 IN-SITU BIOREMEDIATIONBIOENHANCEMENT 17 <br /> 73 1 BASIC PRINCIPLES 17 <br /> 7 3 2 NUTRIENT REQUIREIvlENTS AND TOXICITY 17 <br /> 73 3 MONITORING ACTIVITIES 18 <br /> 73 4 FEASIBILITY STUDIES i8 <br /> 7 3 5 DURATION 18 <br /> 73 6 COST 18 <br /> 74 NATURAL ATTENUATION 19 <br /> 7 4 1 PRINCIPLES 19 <br /> 7 4 2 DURATION 19 <br /> 7 4 3 FEASIBILITY 19 <br /> 744 ESTIMATED COSTS 19 <br /> 80 RECOMMENDATIONS 20 <br /> 8 1 REMEDIATION OF HYDROCARBON-IMPACTED SOIL 20 <br /> 8 2 REMEDIATION OF HYDROCARBON-IlvIPACTED GROUND WATER 21 <br /> 90 LIMITATIONS 22 <br /> • <br />