Ellsworth Air Force Base Initial Five Year Review Submitted by United States Air Force Air Combat Command Dated September 19, 2000 USEPA National Priorities Listing Site CERCLIS Site ID #: SD 2571924644 CONCURRENCE: Max H. Dodson Date' Assistant Regional Administrator Office of Ecosystems Protection and Remediation FINAL FIVE YEAR REVIEW ELLSWORTH AFB, SOUTH DAKOTA UNITED STATES ADR FORCE AIR COMBAT COMMAND SEPTEMBER 19,2000 FXBM 997001 Ettsworth Air Force Base FinalS- Year Review TABLE OF CONTENTS Section Page 1.0 INTRODUCTION..................................................................................................................^ 1.1 PURPOSE OF THE REVIEW......................................................................................^ 1.2 REVIEW PROCESS.....................................................................................................^ 2.0 SITE CHRONOLOGY.........................................................................................................10 3.0 BACKGROUND....................................................................................................................15 3.1 BASEWIDE..........:......................................................................................................15 3.2 OPERABLE UNIT 1 FIRE PROTECTION TRAINING AREA (FPTA).................. 17 3.2.1 Physical Setting............................................................................................. 17 3.2.2 Land and Resource Use................................................................................. 18 3.2.3 History of Contamination.............................................................................. 19 3.2.4 Initial Response .............................................................................................20 3.3 OPERABLE UNIT 2 LANDFILL 1 AND LANDFILL 6...........................................20 3.3.1 Physical Setting.............................................................................................20 3.3.2 Land and Resource Use.............................;.........................;.........................21 3.3.3 History of Contamination..............................................................................22 3.3.4 Initial Response .............................................................................................24 3.4 OPERABLE UNIT 3 LANDFILL 2............................................................................24 3.4.1 Physical Setting.............................................................................................24 3.4.2 Land and Resource use..................................................................................24 3.4.3 History of Contamination......................................................................:....... 25 3.4.4 Initial Response .............................................................................................27 3.5 OPERABLE UNIT 4 LANDFILL 3 ............................................................................27 3.5.1 Physical Setting.............................................................................................27 3.5.2 Land and Resource Use .................................................................................27 3.5.3 History of Contamination..............................................................................28 3.5.4 Initial Response .............................................................................................31 3.6 OPERABLE UNIT 5 LANDFILL-4............................................................................31 3.6.1 Physical Setting.............................................................................................31 3.6.2 Land and Resource Use.................................................................................31 3.6.3 History of Contamination.............................................................................. 32 3.6.4 Initial Response .............................................................................................33 3.7. OPERABLE UNIT 6 LANDFILL 5............................................................................33 3.7.1 Physical Setting.............................................................................................33 3.7.2 Land and Resource Use ................................................................................33 3.7.3 History of Contamination..............................................................................34 3.7.4 Initial Response .............................................................................................35 3.8 OPERABLE UNIT 7 WEAPONS STORAGE AREA................................................35 3.8.1 Physical Setting.............................................................................................35 3.8.2 Land and Resource Use................................................................................. 35 3.8.3 History of Contamination.............................................................................. 36 3.8.4 Initial Response.............................................................................................37 3.9 OPERABLE UNIT 8 EXPLOSIVE ORDNANCE DISPOSAL AREA......................37 3.9.1 Physical Setting.............................................................................................37 Sept&tnber 2000 Ellsworth Air Force Base FinalS- Year Review TABLE OF CONTENTS (continued) Section Page 3.9.2 Land and Resource Use .................................................................................38 3.9.3 History of Contamination.......!......................................................................38 3.9.4 Initial Response .............................................................................................40 3.10 OPERABLE UNIT 9 ...................................................................................................40 3.10.1 Physical Setting .............................................................................................40 3.10.2 Land and Resource Use ................................................:................................40 3.10.3 History of Contamination..............................................................................41 3.10.4 Initial Response .............................................................................................42 3.11 OPERABLE UNIT 10 NORTH HANGER COMPLEX .............................................42 3.11.1 Physical Setting ..........................................:..................................................42 3.11.2 Land and Resource Use .................................................................................42 3.11.3 History of Contamination ..............................................................................43 3.11.4 Initial Response.........................................................................,..............^....44 3.12 OPERABLE UNIT 11 BASEWIDE GROUND WATER...........................................44 3.12.1 Physical Setting .............................................................................................44 3.12.2 Land and Resource Use............:....................................................................45 3.12.3 History of Contamination.............................................................................. 45 3.12.4 Initial Response .............................................................................................47 3.13 OPERABLE UNIT 12 HARDFILL 1..........................................................................47 3.13.1 Physical Setting .............................................................................................47 3.13.2 Land and Resource Use .................................................................................48 3.13.3 History of Contamination ..............................................................................48 3.13.4 Initial Response.........................................................;...................................50 3.14 FLIGHTLINE REFUELING AREA ...........................................................................50 3.14.1 Physical Setting .............................................................................................50 3.14.2 Land and Resource Use .................................................................................50 3.14.3 History of Contamination.............................................................................. 51 3.14.4 Initial Response .............................................................................................52 3.15 OFF-BASE JP-4 SOUTH OF OPERABLE UNIT 2...................................................52 3.15.1 Physical Setting.............................................................................................52 3.15.2 Land and Resource Use .................................................................................52 3.15.3 History of Contamination..............................................................................52 3.15.4 Initial Response .............................................................................................53 4,0 REMEDIAL ACTIONS ...................................................................................................... 54 4.1 REMEDY SELECTION..............................................................................................54 4.1.1 Operable Unit 1 .............................................................................................54