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CADR) Guidance ` Corrective Action Design Report (CADR) Guidance for Leaking Underground Storage Tanks (LUST) Sites Using Risk-Based Corrective Action (RBCA) Iowa Department of Natural Resources Underground Storage Tank Section Wallace State Office Building 502 East Ninth Street Des Moines, IA 50319-0034 515/281-8693 Version 1.0 -- February, 1997 TABLE OF CONTENTS TOPIC Page Number General information .................................................................................................................................................6 Report submittal .........................................................................................................................................7 Review process...........................................................................................................................................7 Reclassification...........................................................................................................................................8 Site monitoring reports...............................................................................................................................8 Report preparation....................................................................................................................................................8 Cover page..................................................................................................................................................8 CADR checklist..........................................................................................................................................8 I. Executive summary................................................................................................................................8 Recommended corrective action Receptors to be addressed Estimated costs Estimated operation time II. Comparison of two corrective action alternatives...............................................................................9 Two principally applicable corrective actions Estimated operation time Estimated costs III. Justification for selected corrective action .........................................................................................9 Cost comparison Documentation IV. Timetable and critical performance benchmarks...............................................................................9 V. System design.......................................................................................................................................9 VI. Pilot test...............................................................................................................................................9 VII. Operation and maintenance plan.....................................................................................................10 VIII. Start-up period plan........................................................................................................................10 IX. Groundwater summary corrective action map................................................................................10 X. Soil summary corrective action map .................................................................................................10 XI. Groundwater flow direction maps....................................................................................................10 XII. Monitoring plan ...............................................................................................................................10 Bedrock monitoring High risk interim High risk remediation Construction documentation Progress summary XIII. Waste management disposal plan..................................................................................................11 Wastewater discharges to storm sewers Wastewater discharges to sanitary sewers XIV. Security / System protection..........................................................................................................12 Soil remediation....................................................................................................................................................13 Soil vapor extraction ..............................................................................................................................................14 Advantages ...............................................................................................................................................14 Limitations................................................................................................................................................14 System components & information.........................................................................................................14 Waste stream treatment............................................................................................................................15 Recommended monitoring and control equipment table........................................................................15 Required parameters to monitor for system performance.......................................................................15 Flow charts ...............................................................................................................................................16 2 Can SVE be used at this site? ..................................................................................................................18 Initial screening of SVE effectiveness ....................................................................................................18 Rationale for the design ...........................................................................................................................19 Pilot test ....................................................................................................................................................19 Pilot test checklist.....................................................................................................................................19 SVE system design checklist...................................................................................................................21 Operation and monitoring plan................................................................................................................22 Start-up operations Long-term operations Recommended system monitoring requirements table...........................................................................22 Bioventing.......... ....................................................................................................................................................23 Advantages...............................................................................................................................................23 Limitations................................................................................................................................................23 System components & information.........................................................................................................23 Factors to consider for well placement / number of wells......................................................................24 Waste stream treatment............................................................................................................................24 Required parameters to monitor for system performance ......................................................................24 Recommended monitoring equipment table ...........................................................................................25 Initial screening of bioventing effectiveness...........................................................................................25 Flow charts ...............................................................................................................................................26 Can bioventing be used at this site?.........................................................................................................29 Pilot tests...................................................................................................................................................30 Soil vapor extraction and injection treatability tests Respirometry studies Laboratory biodegradation studies Rationale for the design ...........................................................................................................................31 Operation and monitoring plan................................................................................................................31 Start-up operations Long-term operations Recommended system monitoring requirements table...........................................................................31 Biomounding.............................................................................................................................................................. 32 Advantages...............................................................................................................................................32 Limitations................................................................................................................................................32 System components & information.........................................................................................................33 Waste stream treatment............................................................................................................................33
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