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Record of Decision System (RODS)

LONG PRAIRIE GROUND WATER CONTAMINATION

Abstract

Site Name:  LONG PRAIRIE GROUND WATER CONTAMINATION
Address:  LONG PRAIRIE CITY LIMITS 
City & State:  LONG PRAIRIE  MN  56347
County:  TODD
 
EPA ID:  MND980904072
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-88/066
ROD Date:  06/27/1988
Operable Unit(s):  01
 
Media:  GROUNDWATER SOIL
 
Contaminant:  VOCS (DCE, PCE, TCE)
 
Abstract:  THE LONG PRAIRIE SITE, AS DEFINED BY THE EXTENT OF THE PLUME OF CONTAMINATED GROUND WATER, EXTENDS 2,100 FEET BY 1,000 FEET IN LONG PRAIRIE, TODD COUNTY, MINNESOTA. THE LONG PRAIRIE RIVER FLOWS WITHIN 500 FEET OF THE CONTAMINANT PLUME. IN AUGUST AND OCTOBER 1983, ROUTINE MUNICIPAL WELL MONITORING BY THE MINNESOTA DEPARTMENT OF HEALTH (MDH) INDICATED CONTAMINATION IN TWO OF FIVE MUNICIPAL WELLS. THE MDH ORDERED THE TWO WELLS SHUT DOWN IN OCTOBER 1983, AND IN NOVEMBER 1983, ISSUED AN ADVISORY TO PROVIDE BOTTLED WATER FOR AREA RESIDENTS. ABOUT 50 OF THE AREA'S 300 PRIVATE WELLS WERE AFFECTED BY THE GROUNDWATER CONTAMINATION. SINCE THE ADVISORY WAS ISSUED, 39 OF THE 45 ACRE HOMES USING CONTAMINATED GROUND WATER HAVE CONNECTED TO THE MUNICIPAL DRINKING WATER SYSTEM. WELL MONITORING IN 1984 IMPLICATED AN AREA DRY CLEANING OPERATION AS THE POTENTIAL SOURCE OF CONTAMINATION. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING 7,000,000 GALLONS OF GROUND WATER AND 3,800 YD3 OF SOIL ARE VOCS AND INCLUDE; DCE, PCE, AND TCE.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES; GROUND WATER PUMP AND TREATMENT USING AIR STRIPPING WITH DISCHARGE TO THE RIVER; SPILL TREATMENT USING ACTIVE SOIL VENTING; AND GROUND WATER MONITORING. THE ESTIMATED CAPITAL COST FOR THIS REMEDIAL ACTION IS $680,000 WITH ANNUAL O&M OF $290,000 FOR YEAR 1 AND $150,000 FOR YEARS 2-5. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $21,706,300 WITHOUT PRETREATMENT, OR $23,078,200 INCLUDING PRETREATMENT, IF NECESSARY.
 
Remedy:  THE FINAL GROUND WATER REMEDY FOR THE SITE WAS DEVELOPED TO PROTECT PUBLIC HEALTH AND THE ENVIRONMENT BY PREVENTING INGESTION OF CONTAMINANTS FOUND IN THE GROUND WATER, AND BY RESTORING THE CONTAMINATED AQUIFER. THE MAJOR COMPONENTS OF THE SELECTED REMEDY ARE AS FOLLOWS;
- INSTALL GROUND WATER EXTRACTION WELLS IN THE CONTAMINATION PLUME;
- TREAT CONTAMINATED GROUND WATER WITH AN AIR STRIPPER;
- DISCHARGE TREATED GROUND WATER FROM THE AIR STRIPPER TO THE LONG PRAIRIE RIVER; AND
- TREAT CONTAMINATED SOIL WITH AN ACTIVE SOIL VENTING SYSTEM.
 
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