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RECORD OF DECISION (RODS) ...

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  • EPA/ROD/R03-06/009 2006

    EPA Superfund

    Record of Decision:

    DOVER AIR FORCE BASE EPA ID: DE8570024010 OU 23 DOVER, DE 05/05/2006

  • RECORD OF DECISION LAND USE CONTROLS AT MULTIPLE SITES DOVER AIR FORCE BASE, DELAWARE March 2006 Prepared by: Oak Ridge National Laboratory Environmental Sciences Division for the U.S. Department of Energy Under Contract DE-AC05-00OR22725 and URS GROUP INC. 200 Orchard Ridge Drive, Suite 101 Gaithersburg, Maryland 20878 Prepared for: United States Department of the Air Force Dover Air Force Base 436 CES/CEVR 600 Chevron Avenue Dover AFB, Delaware 19902-5600

  • Table of Contents LUCs ROD i

    TABLE OF CONTENTS ACRONYMS AND ABBREVIATIONS..........................................................................v PART I: DECLARATION........................................................................................... I-1 1.0 SITE NAMES AND LOCATION........................................................................I-1 1.1 STATEMENT OF BASIS AND PURPOSE ........................................................I-1 1.2 ASSESSMENT OF SITES ...................................................................................I-1 1.3 DESCRIPTION OF SELECTED REMEDY........................................................I-2 1.4 STATUTORY DETERMINATION.....................................................................I-4 1.5 ROD DATA CERTIFICATION CHECKLIST....................................................I-5 1.6 AUTHORIZING SIGNATURES AND SUPPORT AGENCY CONCURRENCE.................................................................................................I-6 PART II: DECISION SUMMARY ............................................................................II-1 2.0 SITE NAMES, LOCATIONS, AND DESCRIPTIONS .................................... II-1 2.1 SITE HISTORY AND ENFORCEMENT ACTIVITIES .................................. II-4

    2.1.1 LF22..................................................................................................... II-5 2.1.2 LF23..................................................................................................... II-5 2.1.3 WP29 ................................................................................................... II-5 2.1.4 OT56 .................................................................................................... II-5 2.1.5 ST58..................................................................................................... II-6 2.1.6 LF16..................................................................................................... II-6 2.1.7 LF19..................................................................................................... II-6 2.1.8 WP32 ................................................................................................... II-6 2.1.9 OT55 .................................................................................................... II-7 2.1.10 FT02..................................................................................................... II-7 2.1.11 LF24..................................................................................................... II-7 2.1.12 LF26..................................................................................................... II-7 2.1.13 WP33 ................................................................................................... II-8 2.1.14 WP38 ................................................................................................... II-8 2.1.15 OT42 .................................................................................................... II-8 2.1.16 OT43 .................................................................................................... II-8 2.1.17 OT45 .................................................................................................... II-9 2.1.18 OT46 .................................................................................................... II-9 2.1.19 OT47 .................................................................................................... II-9 2.1.20 OT49 .................................................................................................... II-9 2.1.21 OT57 .................................................................................................... II-9

    2.2 COMMUNITY PARTICIPATION .................................................................. II-10 2.3 SCOPE AND ROLE OF OPERABLE UNIT OR RESPONSE ACTIONS..... II-10

    2.3.1 Past Actions Associated with Sites Included in this ROD................. II-10 2.3.2 Ongoing and Planned Groundwater Actions ..................................... II-11 2.3.3 Actions Addressed in this ROD......................................................... II-12

  • ii LUCs ROD Table of Contents

    TABLE OF CONTENTS (cont'd)

    2.4 SITE CHARACTERISTICS............................................................................. II-12

    2.4.1 Conceptual Site Model....................................................................... II-12 2.4.2 Topographical and Hydrogeologic Information ................................ II-13 2.4.3 Ecology .............................................................................................. II-14 2.4.4 Archaeological or Historical Significance......................................... II-14 2.4.5 Sampling Strategy.............................................................................. II-14 2.4.6 Nature and Extent of Contamination ................................................. II-15

    2.4.6.1 OT56 ................................................................................ II-16 2.4.6.2 LF16................................................................................. II-16 2.4.6.3 FT02................................................................................. II-16 2.4.6.4 OT43 ................................................................................ II-16 2.4.6.5 LF22................................................................................. II-17 2.4.6.6 WP29................................................................................ II-17 2.4.6.7 ST58................................................................................. II-17

    2.5 CURRENT AND POTENTIAL FUTURE LAND AND WATER USES....... II-18 2.5.1 Land Use ............................................................................................ II-18 2.5.2 Surface Water Use ............................................................................. II-18 2.5.3 Groundwater Use ............................................................................... II-19

    2.6 SUMMARY OF SITE RISKS.......................................................................... II-19 2.6.1 Summary of Human Health Risk Assessment ................................... II-19

    2.6.1.1 Identification of COCs..................................................... II-19 2.6.1.2 Exposure Assessment....................................................... II-20 2.6.1.3 Toxicity Assessment ........................................................ II-21 2.6.1.4 Risk Characterization....................................................... II-23

    2.6.2 Summary of Vapor Intrusion Risks ................................................... II-29 2.6.3 Summary of Ecological Risk Assessment (ERA).............................. II-31

    2.6.3.1 Tier I: Problem Formulation/Scoping Assessment ......... II-31 2.6.3.2 Tier II: Analysis .............................................................. II-31 2.6.3.3 Tier III: Risk Characterization ........................................ II-31 2.6.3.4 ERA Results..................................................................... II-32

    2.6.4 Basis for Action ................................................................................. II-33 2.7 REMEDIAL ACTION OBJECTIVES (RAOs)................................................ II-34 2.8 DESCRIPTION OF ALTERNATIVES ........................................................... II-35

    2.8.1 Description of Remedy Components ................................................. II-35 2.8.1.1 Remedy 1—No Action .................................................... II-35 2.8.1.2 Remedy 2—LUCs............................................................ II-35 2.8.1.3 Remedy 3—Groundwater Pump & Treat/Soil Dig & Haul....................................................................... II-35

    2.8.2 Common Elements and Distinguishing Features of Each Alternative ......................................................................................... II-36 2.8.3 Expected Outcomes of Each Alternative ........................................... II-36

    2.9 SUMMARY OF COMPARATIVE ANALYSIS OF ALTERNATIVES........ II-37 2.9.1 Overall Protection of Human Health and the Environment............... II-38

  • Table of Contents LUCs ROD iii

    TABLE OF CONTENTS (cont'd)

    2.9.2 Compliance with ARARs .................................................................. II-38 2.9.3 Long-Term Effectiveness and Permanence ....................................... II-39 2.9.4 Reduction in Toxicity, Mobility, and Volume of Contaminants Through Treatment ............................................................................ II-39 2.9.5 Short-Term Effectiveness .................................................................. II-39 2.9.6 Implementability................................................................................ II-40 2.9.7 Cost

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