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Record of Decision System (RODS)

ABERDEEN PROVING GROUND (EDGEWOOD AREA)

Abstract

Site Name:  ABERDEEN PROVING GROUND (EDGEWOOD AREA)
Address:  OFF RTE 40 
City & State:  EDGEWOOD  MD  21010
County:  HARFORD
 
EPA ID:  MD2210020036
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-91/125
ROD Date:  09/27/1991
Operable Unit(s):  05
 
Media:  Groundwater
 
Contaminant:  VOCS, BENZENE, PCE, TCE, TOLUENE, METALS, ARSENIC
 
Abstract:  THE 17,000-ACRE USA ABERDEEN - EDGEWOOD SITE IS A MILITARY ORDNANCE INSTALLATION IN EDGEWOOD, MARYLAND. THE 4.5-ACRE OLD O-FIELD SITE, WHICH IS THE FOCUS OF THIS RECORD OF DECISION (ROD), IS A FENCED HAZARDOUS WASTE AND ORDNANCE DISPOSAL AREA LOCATED WITHIN THE LOWER HALF OF THE GUNPOWDER NECK IN THE EDGEWOOD AREA OF THE ABERDEEN PROVING GROUND. LAND USE IN THE AREA CONSISTS OF MILITARY TESTING RANGES, WITH A MIXTURE OF INDUSTRIAL, MILITARY, AND CIVILIAN RESIDENTIAL AREAS. THE SITE OVERLIES TWO AQUIFERS THAT DRAIN INTO WATSON CREEK AND THE GUNPOWDER RIVER, WHICH BORDER THE SITE. FROM 1941 TO 1952, CHEMICAL-WARFARE AGENTS INCLUDING MUSTARD, LEWISITE, ADAMSITE, WHITE PHOSPHORUS, MUNITIONS, CONTAMINATED EQUIPMENT, AND MISCELLANEOUS HAZARDOUS WASTE WERE DISPOSED OF IN 35-ONSITE UNLINED PITS AND TRENCHES. STUDIES HAVE SHOWN THAT CHEMICALS BURIED WITHIN THE PITS HAVE IMPACTED GROUND WATER AND ALSO INTERCONNECTING SURFACE WATER IN WATSON CREEK. FROM 1949 TO THE MID-1970'S, SEVERAL DECONTAMINATION AND CLEAN-UP OPERATIONS WERE CONDUCTED AS A RESULT OF MUNITIONS EXPLOSIONS, WHICH SPREAD MUSTARD INTO THE SURROUNDING SOIL, AIR, WATSON CREEK, AND GUNPOWDER RIVER. THESE OPERATIONS INCLUDED THE APPLICATION OF 1,000 BARRELS OF DECONTAMINATING AGENT NON-CORROSIVE (DANC) CONTAINING CHLORINATED HYDROCARBONS; SOAKING THE FIELD WITH SEVERAL HUNDRED GALLONS OF FUEL OIL AND SETTING THE FIELD ABLAZE; DISPERSING LIME INTO THE SURROUNDING TREES TO FURTHER REDUCE THE AMOUNT OF MUSTARD PRESENT; AND USING SUPERTROPICAL BLEACH, LIME, AND SODIUM HYDROXIDE TO DESTROY CHEMICAL AGENTS. EVIDENCE SHOWS THAT THESE DECONTAMINATION EFFORTS HAVE CONTAMINATED THE GROUND WATER WITH CHLORINATED HYDROCARBONS. SUBSEQUENT REMEDIATION ACTIVITIES WERE LIMITED TO REMOVING AND SECURING ORDNANCE ITEMS ON THE SURFACE. THE SITE HAS BEEN DIVIDED INTO THREE OPERABLE UNITS (OUS) FOR REMEDIATION. THIS ROD PROVIDES AN INTERIM REMEDY FOR CONTAMINATED GROUND WATER AND ITS EFFECT ON SURFACE WATER, AS OU1. FUTURE RODS WILL ADDRESS CONTAMINATED ONSITE SOIL AND SURFACE WATER. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE GROUND WATER ARE VOCS INCLUDING BENZENE, PCE, TCE, AND TOLUENE; AND METALS INCLUDING ARSENIC.

THE SELECTED REMEDIAL ACTION FOR THIS INTERIM REMEDY INCLUDES INSTALLING A DOWNGRADIENT EXTRACTION WELL NETWORK; PUMPING AND ONSITE TREATMENT OF CONTAMINATED GROUND WATER USING CHEMICAL PRECIPITATION, FOLLOWED BY ULTRAVIOLET-OXIDATION; MONITORING THE TREATED EFFLUENT, THEN DISCHARGING THE EFFLUENT ONSITE TO THE GUNPOWDER RIVER; AND DISPOSING OF THE CONTAMINATED CHEMICAL PRECIPITATION FILTER CAKE SLUDGE GENERATED DURING THE TREATMENT PROCESS OFFSITE. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $9,120,000, WHICH INCLUDES AN ESTIMATED ANNUAL O&M COST OF $466,650 FOR 30 YEARS.

PERFORMANCE STANDARDS OR GOALS; CHEMICAL-SPECIFIC GROUND WATER CLEAN-UP GOALS ARE BASED ON CWA AMBIENT WATER QUALITY CRITERIA, AND SDWA MCLS AND PROPOSED MCLS, AND INCLUDE BENZENE 5 UG/L (MCL), PCE 5 UG/L (MCL), TCE 5 UG/L (MCL), TOLUENE 40 UG/L (PMCLS), AND ARSENIC 50 UG/L (MCL).
 
Remedy:  THIS OPERABLE UNIT, THE FIRST OF THREE OPERABLE UNITS FOR THE SITE, ADDRESSES CONTAMINATED GROUNDWATER. THE SECOND OPERABLE UNIT WILL ADDRESS CONTAMINATION OF THE SOILS AND DISPOSED MATERIALS IN THE LANDFILL, AND THE THIRD OPERABLE UNIT WILL ADDRESS CONTAMINATION OF ADJACENT SURFACE WATERS AND SEDIMENTS IN WATSON CREEK. THIS INTERIM RESPONSE ACTION FOR OPERABLE UNIT ONE ADDRESSES CONTAMINATED GROUNDWATER AND ITS DISCHARGE TO INTERCONNECTING SURFACE WATER.

THE MAJOR COMPONENTS OF THE SELECTED INTERIM ACTION ARE AS FOLLOWS;

* CONTAMINATED GROUNDWATER PLUME CONTAINMENT THROUGH DOWNGRADIENT EXTRACTION USING NEWLY INSTALLED WELLS;
* ON-SITE TREATMENT OF EXTRACTED GROUNDWATER USING CHEMICAL PRECIPITATION FOR INORGANICS REMOVAL FOLLOWED BY ULTRAVIOLET- OXIDATION FOR ORGANICS DESTRUCTION; AND
* DISCHARGE OF THE TREATED GROUNDWATER, FOLLOWING COMPLIANCE MONITORING, TO THE GUNPOWDER RIVER.
 
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