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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/R05-86/033
ROD Date:  06/30/1986
Operable Unit(s):  05
 
Media:  GROUNDWATER
 
Contaminant:  PCE, SOLVENTS, 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, AND IS ONE OF SEVERAL COMMUNITIES IN THE AREA WHICH OBTAINS ITS MUNICIPAL WATER SUPPLIES ENTIRELY FROM GROUND WATER RESOURCES. IN JUNE 1981, THE MINNESOTA POLLUTION CONTROL AGENCY (MPCA) AND THE MINNESOTA DEPARTMENT OF HEALTH (MDH) DETECTED ORGANIC SOLVENT CONTAMINATION IN THE GROUND WATER USED FOR MUNICIPAL DRINKING WATER IN NEW BRIGHTON. PRIOR TO THESE FINDINGS, THE CITY OF NEW BRIGHTON HAD CONSTRUCTED AND OPERATED A TOTAL OF NINE MUNICIPAL WELLS. FROM 1982 TO 1984 THE CITY SHUT DOWN SIX WELLS (1 TO 6), DEEPENED TWO MUNICIPAL WELLS (8 AND 9) TO THE MT. SIMON-HINCKLEY AQUIFER AND CONSTRUCTED THREE NEW WELLS (10, 11 AND 12). THESE NEW WELLS WERE ALSO FINISHED IN THE MT. SIMON-HINCKLEY AQUIFER. OF THE ORIGINAL MUNICIPAL WELLS COMPLETED IN THE PRAIRIE DU CHIEN-JORDAN AQUIFER, ONLY WELL 7 PRESENTLY SHOWS MINIMAL CONTAMINATION.

DURING THIS SAME PERIOD, SEVERAL INITIAL REMEDIAL MEASURES (IRMS) WERE IMPLEMENTED AT THE SITE. IN 1983, GRANULAR ACTIVATED CARBON FILTERS WERE INSTALLED ON TWO OF NEW BRIGHTON'S WELLS (5 AND 6) TO MEET PEAK SUMMERTIME DEMANDS. IN ADDITION, PIPELINE CONNECTIONS TO NEW BRIGHTON'S AND ARDEN HILLS' WATER MAINS WERE MADE FOR SEVERAL PRIVATE WELL USERS WHOSE WELLS HAD EXCESSIVE LEVELS OF CONTAMINATION. FINALLY IN 1984, THE CITY OF ST. ANTHONY, WHICH IS IMMEDIATELY SOUTH OF NEW BRIGHTON, RECEIVED A TEMPORARY WATER CONNECTION TO THE CITY OF ROSEVILLE. THIS STATE-LEAD IRM WAS NECESSARY BECAUSE THE CITY OF ST. ANTHONY WAS EXPERIENCING WATER SHORTAGES DUE TO THE CONTAMINATION AND SUBSEQUENT CLOSURE OF ONE OF THEIR THREE PRAIRIE DU CHIEN-JORDAN AQUIFER MUNICIPAL WELLS. CONTAMINATION IS NOW BEING DETECTED IN THE REMAINING TWO MUNICIPAL WELLS AND A PHASED FEASIBILITY STUDY (PFS) IS CURRENTLY BEING CONDUCTED FOR THE CITY'S WATER SUPPLY.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES THE CONSTRUCTION OF A NEW WELL INTO THE MT. SIMON-HINCKLEY AQUIFER SYSTEM TO REPLACE NEW BRIGHTON WELL 7. TOTAL CAPITAL COST FOR THE SELECTED REMEDIAL ALTERNATIVE IS ESTIMATED TO BE $600,500 WITH O&M COSTS APPROXIMATELY $22,820 PER YEAR. MPCA IS CONTINUING ITS COMPREHENSIVE REMEDIAL INVESTIGATION/FEASIBILITY STUDY (RI/FS) FOR THE SITE. A PRELIMINARY RI CHARACTERIZING THE SITE, MAJOR MIGRATION PATHWAYS, AND PRELIMINARY IDENTIFICATION OF SIGNIFICANT SOURCES HAS ALREADY BEEN COMPLETED. MPCA IS PLANNING TO COMPLETE THE REMAINING TASKS OF THE COMPREHENSIVE RI/FS IN 1987 IN ORDER TO EVALUATE POTENTIAL FINAL REMEDIAL ACTION(S).
 
Remedy:  - CONSTRUCT A NEW WELL INTO THE MT. SIMON-HINCKLEY AQUIFER SYSTEM TO REPLACE NEW BRIGHTON WELL 7.
 
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