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CONTENTS (Continued) <br /> Chi P ape <br /> 35 VENDORS 3-21 <br /> 36 STRENGTHS AND LIMITATIONS 3-21 <br /> 3 7 RECOMMENDATIONS 3-22 <br /> 38 REFERENCES 3-23 <br /> 40 DUAL-PHASE EXTRACTION 4-1 <br />' — <br /> 41 TECHNOLOGY OVERVIEW 4-1 <br /> 42 APPLICABILITY 4-2 <br />' 4 2 1 Contaminant Properties 4-2 <br /> 4 2 2 Contaminant Phases 4-3 <br /> 4 2 3 Soil Characteristics 4-4 <br /> 43 ENGINEERING DESCRIPTION 4-5 <br />' 43 1 Dual-Phase Extraction System Design 4-5 <br /> 4 3 1 1 Pilot Testing 4-5 <br /> 4 3 12 Extraction Well Design 4-6 <br /> 4 3 1 3—Extraction Equipment Design 4-7 <br /> 4 3 14 System Monitoring 4-9 <br /> 4 3 2 Dual-Phase Extraction System Characteristics 4-9 <br /> 4 3 2 1 Drop-Tube Entrainment Extraction 4-9 <br /> ' 4 3 2 2 Well-Screen Entrainment 4-11 <br /> 4 3 2 3 Downhole-Pump Extraction 4-13 <br /> ' 44 PERFORMANCE AND COST ANALYSIS 4-13 <br /> 4 4 1 Performance 4-14 <br /> ' 4 4 1 1 Underground Storage Tank Release from a Gasoline <br /> Station in Houston,Texas 4-14 <br /> 4 4 1 2 Underground Storage Tank Release from a Former Car Rental <br /> Lot in Los Angeles,California 4-15 <br /> 4 4 1 3 Release From An Electronics Manufacturing Facility In Texas 4-16 <br /> 4 4 1 4 Underground Storage Tank Release from a Gasoline <br /> Station to Indiana 4-17 <br /> 4 4 1 5 Release from a Gasoline Underground Storage Tank for a <br /> Vehicle Fueling Station at a Hospital in Madison,Wisconsin 4-18 <br /> n <br />