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Record of Decision System (RODS)

LETTERKENNY ARMY DEPOT (SE AREA)

Abstract

Site Name:  LETTERKENNY ARMY DEPOT (SE AREA)
Address:  N FRANKLIN ST EXT 
City & State:  CHAMBERSBURG  PA  17201
County:  FRANKLIN
 
EPA ID:  PA6213820503
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-91/119
ROD Date:  08/02/1991
Operable Unit(s):  01
 
Media:  SOIL
 
Contaminant:  VOCS, TCE, XYLENES
 
Abstract:  THE USA LETTERKENNY SOUTHEAST AREA SITE IS ON A 19,500-ACRE ACTIVE US ARMY FACILITY IN CHAMBERSBURG, FRANKLIN COUNTY, PENNSYLVANIA. LAND USE IN THE AREA IS PRIMARILY AGRICULTURAL WITH SCATTERED RESIDENCES AND MILITARY FACILITIES. GROUND WATER FLOWING BENEATH THE SOUTHEAST SITE DISCHARGES INTO TWO NEARBY STREAMS. DRINKING WATER IN THE 33 RESIDENCES LOCATED WITHIN A 3-SQUARE-MILE RADIUS OF THE FACILITY HAS BEEN AFFECTED BY GROUND WATER CONTAMINATION FROM THE SITE. SINCE 1942, THE US ARMY HAS USED THE SOUTHEAST AREA TO OVERHAUL, REBUILD, AND TEST WHEELED AND TRACKED VEHICLES; DISTRIBUTE CLASS III CHEMICALS AND PETROLEUM; AND STORE, MAINTAIN, DEMILITARIZE, MODIFY, AND DEMOLISH AMMUNITION. THESE ACTIVITIES PAST INDUSTRIAL HAVE INVOLVED THE USE AND DISPOSAL OF TCE, SOLVENTS, HYDROCARBONS, AND METALS. AS A RESULT OF A FEDERAL INTERAGENCY AGREEMENT, EPA CONDUCTED SEVERAL INVESTIGATIONS WHICH IDENTIFIED VOC-CONTAMINATION OF ONSITE SOIL IN THE K AREA ASSOCIATED WITH THE VARIOUS BURIAL TRENCHES, PITS, AND LANDFILLS USED FOR HAZARDOUS WASTE DISPOSAL. THIS RECORD OF DECISION (ROD) ADDRESSES CONTAMINATED SOIL IN THE SOUTHEAST AREA, AND IS THE FIRST OPERABLE UNIT FOR THAT AREA. FUTURE RODS WILL ADDRESS OTHER CONTAMINANT SOURCE AREAS AND GROUND WATER. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL ARE VOCS INCLUDING TCE AND XYLENES.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES EXCAVATING AND TREATING ONSITE 8,000 CUBIC YARDS OF VOC-CONTAMINATED SOIL USING LOW TEMPERATURE THERMAL TREATMENT; CONTROLLING VAPORIZED CONTAMINANTS USING A SECONDARY HIGH-TEMPERATURE COMBUSTOR, OR COLLECTING THESE VAPORS BY ADSORPTION ONTO ACTIVATED CARBON; BACKFILLING THE RESIDUAL ASH ONSITE; DISPOSING OF THE RESIDUAL CARBON OFFSITE; AND CONDUCTING SOIL MONITORING. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $1,539,191. THERE ARE NO O&M COSTS ASSOCIATED WITH THIS REMEDIAL ACTION.

PERFORMANCE STANDARDS OR GOALS; SOIL EXCAVATION LEVELS WILL BE SET AT 225 UG/KG FOR ALL CONTAMINANTS TO ENSURE THAT THE LEVELS OF INDICATOR CHEMICALS IN GROUND WATER WILL MEET THE STATE GROUND WATER REQUIREMENTS.
 
Remedy:  THIS OPERABLE UNIT IS THE FIRST OPERABLE UNIT OF A POSSIBLE THREE OPERABLE UNITS FOR THE SOUTHEASTERN AREA. THE FIRST OPERABLE UNIT AT THIS SITE WILL PROVIDE SOURCE CONTROL FOR THE CONTAMINATED SOILS IN THE K AREA, THEREBY MINIMIZING THE CONTAMINANT MIGRATION FROM THE SOILS INTO THE GROUNDWATER AT THIS SITE. THE CONTAMINATED SOILS ARE A PRINCIPAL THREAT IN THE K AREA. OPERABLE UNIT NUMBER TWO WILL ADDRESS OTHER CONTAMINATION SOURCE AREAS AND OPERABLE UNIT NUMBER THREE WILL ADDRESS GROUNDWATER CONTAMINATION AND A FINAL REMEDIAL RESPONSE ACTION WILL BE SELECTED FOR THIS MEDIA.

THE REMEDIAL ACTION DESCRIBED HEREIN WILL NOT REQUIRE LONG-TERM MANAGEMENT DUE TO THE TREATMENT OF THE CONTAMINATED SOILS IN THE K AREA. THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDE THE FOLLOWING;
* EXCAVATION OF 8000 CUBIC YARDS OF CONTAMINATED SOILS IN THE K AREA;
* THERMAL TREATMENT OF CONTAMINATED SOILS AT A TEMPERATURE NOT GREATER THAN 450 FAHRENHEIT;
* DESTRUCTION OF VOLATILIZED CONTAMINANTS BY A SECONDARY HIGH-TEMPERATURE COMBUSTOR OR ABSORPTION OF VOLATILIZED CONTAMINANTS ONTO ACTIVATED CARBON;
* ANALYSIS OF REPRESENTATIVE SAMPLES OF TREATED SOILS AND COMPARISON WITH TREATMENT CRITERIA;
* PROPER MANAGEMENT OF TREATED SOILS.
 
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