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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/R05-84/029
ROD Date:  08/02/1984
Operable Unit(s):  00
 
Media:  GROUNDWATER
 
Contaminant:  1,1-DICHLOROETHANE, 1,1-DICHLOROETHYLENE, 1,1,1-TRICHLOROETHANE, 1,1,2-TRICHLOROETHYLENE, TRANS-1,2-DICHLOROETHYLENE
 
Abstract:  THE NEW BRIGHTON/ARDEN HILLS SITE IS LOCATED IMMEDIATELY NORTH OF MINNEAPOLIS/ST. PAUL, MINNESOTA. THE "SITE" ACTUALLY INCLUDES PORTIONS OF THE MUNICIPALITIES OF SHOREVIEW, ARDEN HILLS, MOUNDSVIEW, NEW BRIGHTON AND ST. ANTHONY. THE SITE PRESENTLY CONSISTS OF MORE THAN 18 SQUARE MILES OF GROUND WATER CONTAMINATED WITH VOLATILE ORGANICS. IN JUNE 1981, THE MINNESOTA POLLUTION CONTROL AGENCY (MPCA) AND THE MINNESOTA DEPARTMENT OF HEALTH (MDH) FOUND ORGANIC SOLVENT CONTAMINATION IN GROUND WATER USED FOR MUNICIPAL DRINKING WATER IN THE CITY OF NEW BRIGHTON, WHICH LIES IMMEDIATELY TO THE NORTHEAST OF ST. ANTHONY AND MINNEAPOLIS. THE ORIGINAL JUNE 1981 SAMPLING SHOWED NO CONTAMINATION IN THE ST. ANTHONY WELLS; BUT BY LATE 1981, UNQUANTIFIABLE TRACES OF TRICHLOROETHYLENE (TCE) CONTAMINATION BEGAN TO APPEAR IN CITY WELL NUMBER 3. FROM 1982 TO 1984, TCE LEVELS IN WELL NUMBER 3 GRADUALLY ROSE TO THE 8-10 PPB RANGE WITH A PEAK LEVEL OF 23 PPB. IN ADDITION, DICHLOROETHYLENE (DCE) LEVELS GRADUALLY ROSE TO LEVELS AVERAGING APPROXIMATELY 1 PPB, WITH A PEAK OF 1.7 PPB.

U.S. EPA INSTALLED GRANULAR ACTIVATED CARBON FILTERS ON TWO UNDEEPENED WELLS TO MEET THE PEAK SUMMERTIME DEMAND AND AN EXISTING PUBLIC WATER SUPPLY SYSTEM WAS EXTENDED TO AFFECTED PRIVATE WELL USERS AS APPROVED IN IRMS DATED 6/24/83 AND 9/19/83. THIS INITIAL REMEDIAL MEASURE WILL CONSIST OF A TEMPORARY CONNECTION TO AN EXISTING PUBLIC WATER SUPPLY SYSTEM TO REPLACE THE CONTAMINATED MUNICIPAL SYSTEM. TOTAL CAPITAL COST FOR THIS INITIAL REMEDIAL MEASURE IS ESTIMATED TO BE $142,090.
 
Remedy:  - PROVIDE ALTERNATIVE SERVICE FOR THE CITY'S MUNICIPAL WELL THAT WAS FOUND TO HAVE ELEVATED VOLATILE ORGANIC CONTAMINANTS
- PROVIDE NONCONTAMINATED WATER TO AN AREA SERVICING APPROXIMATELY 400 RESIDENTIAL CUSTOMERS AND A 35-ACRE COMMERCIAL AREA
- PROVIDE A 12" INTERCONNECTION WITH THE CITY OF ROSEVILLE, MINNESOTA IN THE VICINITY OF COUNTY ROAD C AND STATE TRUNK HIGHWAY 88 AND BETWEEN THE CORPORATE LIMITS OF ST. ANTHONY AND ROSEVILLE, MINNESOTA
- PROVIDE FOR ADEQUATE STORAGE CAPACITY OF THE WATER TO MEET PEAK DEMANDS.
 
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