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Record of Decision System (RODS)

ROCKY MOUNTAIN ARSENAL (USARMY)

Abstract

Site Name:  ROCKY MOUNTAIN ARSENAL (USARMY)
Address:  IMMED N STAPLETON INTL ARPT 
City & State:  ADAMS COUNTY  CO  80022
County:  ADAMS
 
EPA ID:  CO5210020769
EPA Region:  08
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R08-91/051
ROD Date:  09/05/1991
Operable Unit(s):  26
 
Media:  DEBRIS AIR
 
Contaminant:  AGENT GB, AGENT MUSTARD, AGENT LEWISITE, AGENT VX
 
Abstract:  THE ROCKY MOUNTAIN ARSENAL (RMA) (OPERABLE UNIT 26) SITE COMPRISES PART OF THE 17,000-ACRE RMA SITE, WHICH IS A FORMER US ARMY CHEMICAL WARFARE AND INCENDIARY MUNITIONS MANUFACTURING AND ASSEMBLY PLANT IN ADAMS COUNTY, COLORADO. FROM THE 1950S UNTIL LATE 1969, THE US ARMY USED THE RMA FACILITY TO PRODUCE THE NERVE AGENT GB (ISOPROPYLMETHYL-PHOSPHONOFLUORIDATE). IN ADDITION, BETWEEN 1947 AND 1982, PRIVATE INDUSTRIES LEASED MAJOR PORTIONS OF THE PLANT FACILITIES TO MANUFACTURE VARIOUS INSECTICIDES AND HERBICIDES. SINCE 1970, US ARMY FACILITY OPERATIONS PRIMARILY HAVE INVOLVED THE DESTRUCTION OF CHEMICAL WARFARE MATERIALS. BECAUSE FINAL REMEDIATION OF THE RMA SITE WILL TAKE MANY YEARS TO COMPLETE, 13 INTERIM RESPONSE ACTIONS (IRAS) WERE DETERMINED NECESSARY PRIOR TO IMPLEMENTING THE FINAL ON-POST RECORD OF DECISION (ROD). OPERABLE UNIT 26 (OU26), WHICH IS ONE OF THESE 13 IRAS, IS COMPOSED OF THE PIPING AND EQUIPMENT IN THE BUILDINGS IN THE NORTH AND SOUTH PLANTS AT RMA. FROM 1987 TO 1989, THE US ARMY SURVEYED AND SAMPLED THE FORMER CHEMICAL PROCESS EQUIPMENT AND PIPING IN THE NORTH AND SOUTH PLANTS. IN 1990, THE US ARMY DECONTAMINATED PIPING AND EQUIPMENT IN SOME BUILDINGS IN THE NORTH PLANT, AND SAMPLED 2,354 1-TON CONTAINERS. THIS ROD ADDRESSES CONTAMINATED PIPING AND EQUIPMENT IN NUMEROUS BUILDINGS IN THE NORTH AND SOUTH PLANTS, AND CONTAMINATED 1-TON CONTAINERS. THIS IRA WILL FACILITATE THE FINAL REMEDY FOR THE CLEANUP OF CHEMICAL PROCESS BUILDINGS AND STRUCTURES, BY VERIFYING THE DECONTAMINATION STATUS OF CHEMICAL PROCESS PIPING, EQUIPMENT, AND 1-TON CONTAINERS, AND DECONTAMINATING THESE STRUCTURES AND 1-TON CONTAINERS, AS NECESSARY, TO ALLOW FOR REUSE OR DISPOSAL OF THE EQUIPMENT AND PIPING. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE DEBRIS AND AIR ARE THE CHEMICAL AGENTS GB (AGENT GB, SARIN), HD (AGENT MUSTARD), L (AGENT LEWISITE), AND VX (AGENT VX).

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES SAMPLING TO DETERMINE THE LEVEL OF DECONTAMINATION INSIDE PIPING AND EQUIPMENT AS IDENTIFIED IN THE SAMPLING OPERATIONS IN THE NORTH AND SOUTH PLANTS; DECONTAMINATING PIPING, EQUIPMENT, AND 1-TON CONTAINERS; AND DISMANTLING PIPING AND EQUIPMENT. NO COST INFORMATION WAS PROVIDED FOR THIS INTERIM REMEDIAL ACTION.

PERFORMANCE STANDARDS OR GOALS; CHEMICAL-SPECIFIC STANDARDS FOR AIR ARE BASED ON FEDERAL REGULATIONS AND INCLUDE GB 0.0001 MG/M3, HD 0.003 MG/M3, L 0.003 MG/M3, AND VX 0.0001 MG/M3.
 
Remedy:  ACTIVITIES UNDER THIS IRA WILL BE PERFORMED IN ACCORDANCE WITH APPLICABLE REGULATIONS AND REQUIREMENTS. SPECIFIC METHODS AND PROCEDURES FOR THESE ACTIVITIES WILL BE IN ACCORDANCE WITH US ARMY REGULATIONS, AMCR-385-131.

IMPLEMENTATION OF THE ACTION TO SAMPLE, DECONTAMINATE, AND DISMANTLE CHEMICAL PROCESS EQUIPMENT/PIPING AND OTHER ANCILLARY MATERIAL IS THE PREFERRED ALTERNATIVE FOR THE FOLLOWING REASONS;
* FACILITATE THE FINAL REMEDY FOR CLEAN UP OF CHEMICAL PROCESS BUILDINGS AND STRUCTURES.
* VERIFY DECONTAMINATION STATUS OF CHEMICAL PROCESS PIPING/EQUIPMENT AND OTHER ANCILLARY MATERIALS.
* REMOVAL FOR REUSE OR DISPOSAL OF CHEMICAL PROCESS EQUIPMENT/PIPING AND OTHER ANCILLARY MATERIALS.

SAMOLINO, DECONTAMINATION, AND DISMANTLING OF CHEMICAL PROCESS PIPING AND EQUIPMENT IN THE NORTH AND SOUTH PLANTS THE SCOPE FOR THIS OPERATION WILL INCLUDE;
* SAMPLING TO DETERMINE THE LEVEL OF DECONTAMINATION INSIDE PIPING/EQUIPMENT AS IDENTIFIED IN THE SAMPLING OPERATIONS.
* DECONTAMINATION OF PIPING/EQUIPMENT.
* DISMANTLING OF PIPING/EQUIPMENT.
 
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