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Record of Decision System (RODS)

NEW BRIGHTON/ARDEN HILLS/TCAAP (USARMY)

Abstract

Site Name:  NEW BRIGHTON/ARDEN HILLS/TCAAP (USARMY)
Address:  JCT HWY 10 & MN HWY 96S 
City & State:  NEW BRIGHTON  MN  55112
County:  RAMSEY
 
EPA ID:  MN7213820908
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-89/118
ROD Date:  08/11/1989
Operable Unit(s):  08
 
Media:  SOIL
 
Contaminant:  VOCS, TCE, PCE, ORGANICS, PCBS, METALS, ARSENIC, LEAD
 
Abstract:  THE NEW BRIGHTON/ARDEN HILLS SITE, ALSO KNOWN AS THE TWIN CITIES ARMY AMMUNITION PLANT (TCAAP) SITE, IS IN NEW BRIGHTON, MINNESOTA. LAND USE BORDERING THE FOUR SQUARE-MILE SITE IS LARGELY RESIDENTIAL. PAST DISPOSAL OF AMMUNITION MANUFACTURING WASTES ONSITE RESULTED IN CONTAMINATION OF GROUND WATER BENEATH AND DOWNGRADIENT OF THE SITE. A TOTAL OF 14 WASTE DISPOSAL LOCATIONS HAVE BEEN IDENTIFIED AND ASSIGNED AS SITES A THROUGH K. DURING REMEDIAL INVESTIGATIONS AT SITE D, SOIL WAS DISCOVERED TO BE CONTAMINATED WITH PCBS AND OTHER ORGANIC AND METAL CONTAMINANTS. A SOIL GAS EXTRACTION SYSTEM WAS IMPLEMENTED TO REMOVE THE SOURCE OF VOLATILE ORGANIC CONTAMINATION AND REDUCE THE POTENTIAL OF MIGRATION TO GROUND WATER. IN IMPLEMENTING THE SOIL GAS EXTRACTION SYSTEM, PCB-CONTAMINATED SOIL WAS REMOVED, STOCKPILED NEAR SITE D, AND SEALED WITH A PLASTIC LINER MATERIAL. THIS INTERIM REMEDY ADDRESSES THE TREATMENT AND DISPOSAL OF CONTAMINATED SOIL THAT IS STOCKPILED NEAR SITE D. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE SOIL ARE VOCS INCLUDING TCE AND PCE, OTHER ORGANICS INCLUDING PCBS, AND METALS INCLUDING ARSENIC AND LEAD.

THE SELECTED REMEDIAL ACTION FOR THE SITE INCLUDES ONSITE TREATMENT OF APPROXIMATELY 1,400 CUBIC YARDS OF STOCKPILED SOIL USING MOBILE INFRARED THERMAL TREATMENT TECHNOLOGY; ANALYSIS OF TREATED SOIL TO ENSURE PCB TREATMENT GOAL IS MET, FOLLOWED BY PLACEMENT OF TREATED SOIL IN AN AREA NEAR SITE D; DISCHARGE OF TREATED SCRUBBER WASTEWATER TO THE TCAAP SANITARY SEWER SYSTEM AND ULTIMATELY TO A POTW; DECONTAMINATION AND REMOVAL OF EQUIPMENT USED IN THE TREATMENT PROCESS; AND AIR MONITORING DURING SOIL TREATMENT. THE ESTIMATED TOTAL COST FOR THE SELECTED REMEDY IS $1,200,000.
 
Remedy:  APPROXIMATELY 1,400 CUBIC YARDS OF PCB-CONTAMINATED SOILS WILL BE TREATED USING A MOBILE THERMAL TREATMENT SYSTEM. THE MOBILE SYSTEM WILL BE TRANSPORTED TO TCAAP AND ASSEMBLED FOR OPERATION. THE THERMAL OPERATION IS EXPECTED TO TAKE APPROXIMATELY THREE WEEKS. THIS REMEDY IS NOT INTENDED TO ADDRESS THE GROUNDWATER CONTAMINATION AT TCAAP. GROUNDWATER CONTAMINATION HAS BEEN PARTIALLY ADDRESSED BY OTHER INTERIM REMEDIAL ACTIONS. SOIL AND WATER CONTAMINATION WILL BE ADDRESSED IN THE FINAL REMEDY.
 
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