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Record of Decision System (RODS)

NAVAL INDUSTRIAL RESERVE ORDNANCE PLANT

Abstract

Site Name:  NAVAL INDUSTRIAL RESERVE ORDNANCE PLANT
Address:  4800 E RIVER RD 
City & State:  FRIDLEY  MN  55421
County:  ANOKA
 
EPA ID:  MN3170022914
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-90/136
ROD Date:  09/28/1990
Operable Unit(s):  01
 
Media:  GROUNDWATER
 
Contaminant:  VOCS, PCE, TCE, TOLUENE, XYLENE
 
Abstract:  THE 82.6-ACRE NAVAL INDUSTRIAL RESERVE ORDNANCE PLANT (NIROP) SITE IS A WEAPONS SYSTEM MANUFACTURING FACILITY IN FRIDLEY, MINNESOTA, WHICH BEGAN OPERATIONS IN 1940. THE SITE IS A GOVERNMENT-OWNED, CONTRACTOR-OPERATED, PLANT LOCATED JUST NORTH OF THE FMC CORP. SUPERFUND SITE. NIROP IS LOCATED APPROXIMATELY 30 FEET ABOVE AND 700 FEET EAST OF THE MISSISSIPPI RIVER AND LESS THAN ONE MILE UPSTREAM FROM THE CITY OF MINNEAPOLIS DRINKING WATER SUPPLY INTAKE. DURING THE 1970S, PAINT SLUDGE AND CHLORINATED SOLVENTS WERE DISPOSED OF ONSITE IN PITS AND TRENCHES. IN 1981, STATE INVESTIGATIONS IDENTIFIED TCE IN ONSITE WATER SUPPLY WELLS DRAWING FROM THE PRAIRIE DUCHIEN/JORDAN AQUIFER, AND THE WELLS WERE SHUT DOWN. IN 1983, EPA FOUND DRUMMED WASTE IN THE TRENCHES OR PITS AT THE NORTHERN PORTION OF THE SITE, AND AS A RESULT, DURING 1983 AND 1984, THE NAVY AUTHORIZED AN INSTALLATION RESTORATION PROGRAM, DURING WHICH APPROXIMATELY 1,200 CUBIC YARDS OF CONTAMINATED SOIL AND 42 DRUMS WERE EXCAVATED AND LANDFILLED OFFSITE. IN 1987, TCE USE AT THE SITE WAS DISCONTINUED, BUT THE PRINCIPAL THREAT POSED BY THE SITE IS THE CONTINUED MIGRATION OF TCE VIA GROUND WATER TO THE MISSISSIPPI RIVER. THIS RECORD OF DECISION (ROD) ADDRESSES THE REMEDIATION OF A SHALLOW GROUND WATER OPERABLE UNIT. THE NEED FOR A SECOND OPERABLE UNIT TO TREAT POTENTIAL CONTAMINATION SOURCES WILL BE DETERMINED PENDING THE RESULTS OF ADDITIONAL INVESTIGATIONS. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE GROUND WATER ARE VOCS INCLUDING PCE, TCE, TOLUENE, AND XYLENE.

THE SELECTED REMEDIAL ACTION FOR THE SITE IS A TWO-PHASED APPROACH. PHASE I INCLUDES GROUND WATER PUMPING AND PRE-TREATMENT, AS NECESSARY, BEFORE DISPOSAL TO A LOCAL PUBLICLY OWNED TREATMENT WORKS (POTW) VIA AN EXISTING SANITARY SEWER SYSTEM; AND TESTING THE RECOVERED WATER TO ASSIST IN THE DESIGN OF PHASE II TREATMENT FACILITIES; PHASE II INCLUDES TREATING THE RECOVERED GROUND WATER BY EITHER A TWO-STAGE AIR STRIPPING PROCESS, FOLLOWED BY VAPOR-PHASE GRANULAR ACTIVATED CARBON (GAC) TO TREAT AIR EMISSIONS, OR TREATING GROUND WATER USING AQUEOUS-PHASE GAC, DEPENDING ON PHASE 1 TEST RESULTS; AND DISCHARGING TREATED GROUND WATER INTO THE MISSISSIPPI RIVER. BOTH OPTIONS INCLUDE DISPOSAL OF THE TREATED EFFLUENT OFFSITE AND REGENERATING THE SPENT CARBON AT AN OFFSITE FACILITY. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $4,100,000 FOR THE GAC-ONLY OPTION. O&M COSTS WERE NOT PROVIDED.

PERFORMANCE STANDARDS OR GOALS: GROUND WATER QUALITY IN THE UNCONSOLIDATED AQUIFER AT THE SITE WILL BE RESTORED TO MCLS OR STATE RECOMMENDED ALLOWABLE LIMITS, IF MORE RESTRICTIVE. BECAUSE TCE WAS FOUND WITH THE GREATEST FREQUENCY AND IN THE HIGHEST CONCENTRATIONS AT THE SITE THAN ANY OTHER VOC, TCE 5.0 UG/L (MCL) WAS ESTABLISHED AS THE TARGET CLEANUP GOAL FOR GROUND WATER IN THE AQUIFER. CLEANUP LEVELS FOR RECOVERED GROUND WATER DISCHARGED TO THE LOCAL POTW MUST NOT EXCEED 10 MG/L AND INDIVIDUAL VOC LEVELS MUST BE LESS THAN 3 MG/L (LOCAL POTW STANDARDS). CONTAMINANTS IN ANY UNCAPTURED PORTION OF THE AQUIFER ARE EXPECTED TO DISSIPATE BY NATURAL MEANS OVER TIME.
 
Remedy:  THIS ACTION ADDRESSES THE PRINCIPAL THREAT POSED BY THE NIROP BY PREVENTING ENDANGERMENT OF PUBLIC HEALTH, WELFARE, OR THE ENVIRONMENT BY IMPLEMENTATION OF THIS RECORD OF DECISION THROUGH HYDRAULIC CONTAINMENT AND RECOVERY OF ALL FUTURE MIGRATION OF CONTAMINATED GROUND WATER FROM THE NIROP AND BY RECOVERY, TO THE EXTENT FEASIBLE, OF CONTAMINATION DOWNGRADIENT OF THE NIROP.

THE SELECTED REMEDY INCLUDES INSTALLATION AND OPERATION OF GROUND WATER CONTAINMENT AND RECOVERY WELLS, WITH A TWO-PHASED PLAN FOR DISPOSAL OF THE GROUND WATER FROM THE WELL SYSTEM.

UNDER PHASE I, THE CONTAMINATED GROUND WATER FROM THE CONTAINMENT AND RECOVERY WELL SYSTEM WILL BE DISCHARGED DIRECTLY TO THE EXISTING SANITARY SEWER SYSTEM, FOR TREATMENT AT THE LOCAL WASTEWATER TREATMENT FACILITY. PRETREATMENT WILL BE PROVIDED IF NECESSARY TO MEET LOCAL DISCHARGE REQUIREMENTS. PHASE I ACTIVITIES WILL ALSO INCLUDE FIELD TESTING OF THE RECOVERED GROUND WATER, FOLLOWED BY DESIGN OF A GROUND WATER TREATMENT PLANT AT THE NIROP. PRIOR TO START-UP OF THE GROUND WATER CONTAINMENT SYSTEM, THE NAVY WILL SUBMIT A GROUND WATER MONITORING PROGRAM FOR APPROVAL BY THE USEPA AND MPCA, TO CONFIRM THAT CONTAINMENT OF THE GROUND WATER PLUME IS EFFECTIVE.

DURING THE FIRST 90 DAYS OF RECOVERY SYSTEM OPERATION, THE NAVY WILL COLLECT DATA TO DETERMINE WHETHER HYDRAULIC CONTAINMENT IS BEING EFFECTIVELY ACHIEVED. THIS DETERMINATION WILL BE SUMMARIZED IN A DOCUMENT WHICH WILL BE SENT TO THE USEPA AND MPCA FOR REVIEW AND APPROVAL AT THE END OF THE 90-DAY PERIOD. THE USEPA AND MPCA WILL PROVIDE WRITTEN APPROVAL OF, OR COMMENTS ON, THE DETERMINATION DOCUMENT WITHIN 30 DAYS AFTER ITS RECEIPT. IF THE USEPA AND MPCA DO NOT APPROVE THE DETERMINATION DOCUMENT, THE NAVY WILL SUBMIT A REVISED DETERMINATION DOCUMENT TO THE USEPA AND MPCA WITHIN 60 DAYS AFTER THE NAVY IS NOTIFIED OF SPECIFIC DEFICIENCIES IN THE DOCUMENT. IF THE DETERMINATION DOCUMENT, AFTER ITS APPROVAL BY THE USEPA AND MPCA, INDICATES THAT EFFECTIVE HYDRAULIC CONTAINMENT IS NOT BEING PROVIDED BY THE GROUND WATER RECOVERY SYSTEM, THE NAVY WILL PREPARE AND SUBMIT TO USEPA AND MPCA A WRITTEN PLAN FOR UPGRADING THE RECOVERY SYSTEM TO ASSURE THAT THE PERFORMANCE OBJECTIVES OF THE CONTAINMENT SYSTEM ARE MET, AND THE NAVY WILL IMPLEMENT THE FINALLY APPROVED PLAN.

UNDER PHASE II, WITHIN 365 DAYS AFTER THE USEPA AND MPCA APPROVE THE DETERMINATION THAT THE GROUP WATER CONTAINMENT AND RECOVERY SYSTEM IS EFFECTIVE, DESIGN DOCUMENTS FOR A GROUND WATER TREATMENT SYSTEM WILL BE COMPLETED BY THE NAVY AND APPROVED BY THE USEPA AND MPCA. TREATED GROUND WATER WILL BE DISCHARGED TO THE MISSISSIPPI RIVER VIA A NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) STORM SEWER DISCHARGE. A PORTION OF THE AQUIFER WITHIN THE ANOKA COUNTY PARKLAND CLOSEST TO THE MISSISSIPPI RIVER MAY NOT FAIL WITHIN THE ZONE OF CAPTURE OF THE GROUND WATER RECOVERY SYSTEM. HOWEVER, SHOULD THIS OCCUR, CONTAMINANTS IN ANY UNCAPTURED PORTION OF THE AQUIFER ARE EXPECTED TO DISSIPATE BY NATURAL MEANS OVER TIME TO LEVELS THAT ARE PROTECTIVE OF HUMAN HEALTH AND THE ENVIRONMENT. SHOULD THE CITY OF MINNEAPOLIS OR ANOTHER COMMUNITY DECIDE IN THE FUTURE TO DEVELOP A SUPPLEMENTAL WATER SUPPLY WELL SYSTEM IN THE ANOKA COUNTY PARKLAND, THE NAVY WILL CONTROL THE HEALTH RISK WITHIN ACCEPTABLE LEVELS BY IMPLEMENTATION OF A GROUND WATER TREATMENT SYSTEM OR OTHER MEASURES AS APPROVED BY THE MPCA AND THE USEPA.
 
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