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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/R05-87/047
ROD Date:  03/31/1987
Operable Unit(s):  03
 
Media:  GROUNDWATER
 
Contaminant:  DCE, TCE, VOCS
 
Abstract:  THE NEW BRIGHTON/ARDEN HILLS/ST. ANTHONY SITE IS LOCATED APPROXIMATELY TWO MILES NORTH OF THE TWIN CITIES OF MINNEAPOLIS/ST. PAUL, MINNESOTA. THE CITY OF ST. ANTHONY, LOCATED DIRECTLY NORTH OF THE TWIN CITIES, IS ONE OF SEVERAL COMMUNITIES WHICH OBTAIN ITS MUNICIPAL WATER SUPPLY FROM THE PRAIRIE DUE CHIEN-JORDAN AQUIFER SYSTEM. THE CITY OF ST. ANTHONY OBTAINS ITS WATER SUPPLY FROM WELL NUMBERS 4 AND 5 AND AN INTERCONNECTION TO THE CITY OF ROSEVILLE'S WATER DISTRIBUTION SYSTEM. IN JUNE 1981, THE MINNESOTA POLLUTION CONTROL AGENCY (MPCA) AND THE MINNESOTA DEPARTMENT OF HEALTH (MDH) DETECTED VOC CONTAMINATION IN THE PRAIRIE DU CHIEN-JORDAN AQUIFER SYSTEM USED FOR MUNICIPAL DRINKING WATER IN NEW BRIGHTON. SUBSEQUENTLY, THE CITY OF ST. ANTHONY HAS ALSO DETECTED VOC CONTAMINATION IN THEIR THREE PRAIRIE DUE CHIEN-JORDAN AQUIFER WELLS; WELL NUMBER 3, 4 AND 5. WELL 4 IS THE CITY'S MAJOR SOURCE OF WATER. WELL 5 AND THE ROSEVILLE INTERCONNECTION ARE USED FOR SUMMER, PEAK, OR EMERGENCY SITUATIONS. WELL 3 WAS SHUT DOWN IN EARLY 1984 DUE TO VOC CONTAMINATION. AS THE NUMBER OF CONTAMINATED WELLS WITHIN THE PRAIRIE DU CHIEN-JORDAN BEGAN INCREASING, EPA INITIATED SEVERAL INITIAL REMEDIAL MEASURES. IN 1983 GRANULAR ACTIVATED CARBON FILTERS WERE INSTALLED ON NEW BRIGHTON WELLS 5 AND 6 AND SEVERAL PRIVATE WELL USERS WERE CONNECTED TO NEW BRIGHTON AND ARDEN HILL'S WATERMAINS. IN 1984 THE CITY OF ST. ANTHONY RECEIVED A TEMPORARY WATER CONNECTION TO THE CITY OF ROSEVILLE DUE TO WATER SHORTAGES RESULTING FROM SUBSEQUENT CLOSURE OF A CONTAMINATED WELL. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE GROUND WATER INCLUDE; TCE, DCE, AND OTHER VOCS.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES; CONSTRUCTION OF GRANULAR ACTIVATED CARBON (GAC) WATER TREATMENT FACILITIES TO REMOVE VOCS FROM ST. ANTHONY WELLS 3, 4, AND 5 WITH DISCHARGE TO THE MUNICIPAL WATER TREATMENT PLANT AND DISTRIBUTION SYSTEM; AND CONSTRUCTION OF A PIPELINE TO CONNECT ST. ANTHONY WELL 5 WITH THE GAC TREATMENT FACILITIES. TOTAL CAPITAL COSTS FOR THE SELECTED REMEDIAL ACTION IS ESTIMATED TO BE $1,100,500 WITH ANNUAL O&M COSTS OF $160,770. THE MPCA PLANS TO COMPLETE ITS EVALUATION OF FINAL REMEDIAL ACTIONS IN 1988.
 
Remedy:  - CONSTRUCTION OF GRANULAR ACTIVATED CARBON (GAC) WATER TREATMENT FACILITIES TO REMOVE VOLATILE ORGANIC COMPOUNDS FROM THE CONTAMINATED WATER FROM ST. ANTHONY WELLS 3, 4 AND 5. THE TREATED WATER WILL BE DISCHARGED INTO THE MUNICIPAL WATER TREATMENT PLANT AND DISTRIBUTION SYSTEM.
- CONSTRUCTION OF A PIPELINE CONNECTING ST. ANTHONY WELL 5 TO THE GAC TREATMENT FACILITIES.
 
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