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Record of Decision System (RODS)

DOVER AIR FORCE BASE

Abstract

Site Name:  DOVER AIR FORCE BASE
Address:  RTE 113 
City & State:  DOVER  DE  19901
County:  KENT
 
EPA ID:  DE8570024010
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-90/104
ROD Date:  09/28/1990
Operable Unit(s):  01
 
Media:  SOIL SLUDGE DEBRIS
 
Contaminant:  VOCS, BENZENE, TOLUENE, XYLENES, METALS, LEAD
 
Abstract:  THE 3,734-ACRE DOVER AIR FORCE BASE SITE IS AN ACTIVE MILITARY BASE IN DOVER, KENT COUNTY, DELAWARE. SURROUNDING LAND USE IS PRIMARILY AGRICULTURAL/RESIDENTIAL, AND WETLANDS ASSOCIATED WITH STREAM FLOODPLAIN AREAS ARE LOCATED ONSITE. SINCE 1941, THE BASE HAS OPERATED AS A MILITARY AIR FIELD AND HAS SERVED SEVERAL DIFFERENT FUNCTIONS INCLUDING PRESENT DAY CARGO OPERATIONS. HAZARDOUS WASTE HAS BEEN GENERATED AT THE BASE FROM INDUSTRIAL OPERATIONS, FUELS MANAGEMENT, FIRE TRAINING, AND PESTICIDE USE. THESE WASTES HAVE BEEN HANDLED IN VARIOUS MANNERS SINCE 1941, INCLUDING DISPOSAL IN ONSITE LANDFILLS AND PITS, USE IN FIRE TRAINING EXERCISES, AND DISCHARGE TO SURFACE DRAINAGE DITCHES. A 1.3-ACRE AREA REFERRED TO AS FIRE TRAINING AREA #3 (FT-3), LOCATED IN THE NORTHEASTERN PORTION OF THE SITE, WAS USED TO CONDUCT FIRE TRAINING EXERCISES, AND CURRENTLY CONTAINS SEVERAL WASTES PITS, AN OIL/WATER SEPARATOR, DUMPSTERS, AND AN UNDERGROUND STORAGE TANK USED DURING THE EXERCISES. FROM 1962 UNTIL 1970, CONTAMINATED WASTE OILS AND FUELS WERE PLACED ON AN OLD AIRCRAFT OR SPREAD IN A PIT AND IGNITED FOR FIRE TRAINING EXERCISES IN FT-3. APPROXIMATELY 1,000 GALLONS OF WASTE MATERIAL WERE USED PER EXERCISE, WITH TWO EXERCISES BEING PERFORMED EACH WEEK. IN 1970, THE ORIGINAL PIT WAS FILLED IN, AND A NEW PIT WAS EXCAVATED. METAL DUMPSTERS WERE PLACED IN THE PIT AND WASTE JP-4 FUEL WAS IGNITED ON THEM DURING QUARTERLY TRAINING EXERCISES. DRAINAGE FROM THE PIT WAS COLLECTED IN AN UNDERGROUND OIL/WATER SEPARATOR, AND WAS REMOVED FROM THE SITE BY A WASTE OIL RECOVERY CONTRACTOR. AN UNDERGROUND STORAGE TANK, USED TO STORE JP-4 FUEL USED IN THE EXERCISES AND UNDERGROUND PIPES, ALSO IS LOCATED NEAR THE PIT. FIRE TRAINING EXERCISES CEASED IN 1989. INVESTIGATIONS IN 1989 BY DOVER AIR FORCE BASE REVEALED THE PRESENCE OF CONTAMINATED SOIL IN THE PIT AREA. RESIDUAL WASTE FUEL, OIL, AND SLUDGES STILL REMAIN IN UNDERGROUND PIPING, CREATING A FIRE AND EXPLOSION HAZARD. THIS RECORD OF DECISION (ROD) ADDRESSES REMEDIATION OF SOIL AND STRUCTURES WITHIN THE FT-3 AREA. SUBSEQUENT RODS WILL ADDRESS OTHER SOURCES OF CONTAMINATION AND CONTAMINATED GROUND WATER IN OTHER SITE AREAS. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL, SLUDGE, AND DEBRIS ARE VOCS INCLUDING BENZENE, TOLUENE, AND XYLENES; AND METALS INCLUDING LEAD.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES REMOVING RESIDUAL LIQUIDS, SLUDGES, AND SOLIDS FROM THE UNDERGROUND TANK, OIL/WATER SEPARATOR, AND PIPING, AND TRANSPORTING THESE MATERIALS OFFSITE FOR DISPOSAL; EXCAVATING THE UNDERGROUND TANK, OIL/WATER SEPARATOR, DUMPSTERS, AND PIPING, AND DECONTAMINATING THEM USING HIGH-TEMPERATURE STEAM CLEANING EQUIPMENT; DISPOSING OF THE CONTAMINATED STEAM CLEANING SOLUTION AND EXCAVATED DEBRIS AND STRUCTURES OFFSITE; BACKFILLING AND GRADING EXCAVATED AREAS; AND PLACING A REVEGETATED SOIL COVER OVER THE FT-3 AREA. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $100,000, WHICH INCLUDES A TOTAL O&M COST OF $5,000 OVER 20 YEARS.

PERFORMANCE STANDARDS OR GOALS: CHEMICAL-SPECIFIC CLEANUP GOALS WERE NOT PROVIDED. INSTITUTIONAL CONTROLS: NOT PROVIDED.
 
Remedy:  THIS OPERABLE UNIT IS THE FIRST OF SEVERAL OPERABLE UNITS FOR DOVER AIR FORCE BASE. INVESTIGATIONS ARE ONGOING AT DOVER AIR FORCE BASE. AS ADEQUATE INFORMATION IS KNOWN ABOUT THE ADDITIONAL OPERABLE UNITS, ADDITIONAL RESPONSE ACTIONS WILL BE TAKEN. THE PRIMARY OBJECTIVE OF THE SELECTED REMEDY IS TO PROTECT PUBLIC HEALTH AND THE ENVIRONMENT BY ABATING THE FIRE AND EXPLOSION THREAT. SITE PIPING AND STRUCTURES ARE CONTAMINATED WITH RESIDUAL WASTE FUEL AND WASTE OIL WHICH POSE A THREAT OF FIRE AND EXPLOSION. THE SELECTED REMEDY ADDRESSES THE PRINCIPAL THREATS TO HUMAN HEALTH PRESENTLY POSED BY THE SITE. THE SITE STRUCTURES, WHICH INCLUDE AN UNDERGROUND STORAGE TANK (UST), AN OIL/WATER SEPARATOR AND ABOVE GROUND DUMPSTERS, WILL BE REMOVED AND DECONTAMINATED. SOIL SURROUNDING THE UNDERGROUND TANK WILL BE TESTED AFTER REMOVAL OF THE TANK. A RISK-BASED DETERMINATION WILL BE MADE AS TO THE DISPOSITION OF THE SOIL NEAR THE UST UPON COMPLETION OF THE SOIL TESTS. A SOIL COVER WILL BE PLACED OVER THE SITE AND THE SITE REVEGETATED. THE DECONTAMINATION/REMOVAL OF THE SITE STRUCTURES CONSISTS OF THE FOLLOWING MAJOR COMPONENTS;

* A PUMP WOULD BE USED TO PUMP THE RESIDUAL WASTE FUEL/OIL FROM THE STRUCTURES.
* THE UNDERGROUND TANKS AND STRUCTURES WILL BE EXCAVATED.
* HIGH TEMPERATURE AND PRESSURIZED STEAM WILL BE USED TO DECONTAMINATE THE STRUCTURES. THE STRUCTURES WILL BE DISPOSED OFF.
* THE LIQUID SLUDGE AND DECONTAMINATION WATER WILL BE TESTED. IF FOUND TO BE A RCRA WASTE REGULATIONS COVERING DISPOSAL OF RCRA LIQUID WASTES WILL BE FOLLOWED. OTHERWISE DELAWARE UST REGULATION GOVERNING DISPOSAL WILL BE FOLLOWED.

AS PART OF THE CONTINUING BASE WIDE STUDY PRESENTLY UNDERWAY AT DOVER AIR FORCE BASE, ANY DEGRADATION IN GROUNDWATER AND SURFACE WATER CAUSED BY THE SITE (IF ANY) WILL BE IDENTIFIED.
 
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