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Record of Decision System (RODS)

MAIN STREET WELL FIELD

Abstract

Site Name:  MAIN STREET WELL FIELD
Address:  1120 N MAIN ST 
City & State:  ELKHART  IN  46514
County:  ELKHART
 
EPA ID:  IND980794358
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-85/017
ROD Date:  08/02/1985
Operable Unit(s):  01
 
Media:  GROUNDWATER SOIL
 
Contaminant:  1,1-DICHLOROETHANE, 1,1,1-TRICHLOROETHANE, 1,2-DICHLOROETHYLENE (1,2-DCE), TETRACHLOROETHYLENE (PCE), TRICHLOROETHYLENE (TCE), VOCS
 
Abstract:  THE CITY OF ELKHART IS LOCATED IN NORTH CENTRAL INDIANA IN ELKHART COUNTY. THREE WELL FIELDS SUPPLY DRINKING WATER TO APPROXIMATELY 37,000 OF THE CITY'S RESIDENTS. MAIN STREET WELL FIELD IS THE LARGEST OF THE THREE WELL FIELDS CONSISTING OF 15 WELLS ON 10 ACRES, AND SUPPLIES 70-80 PERCENT OF THE CITY'S WATER NEEDS. IN APRIL 1981 DURING AN U.S. EPA GROUNDWATER SUPPLY SURVEY, VOLATILE ORGANIC COMPOUNDS WERE DETECTED IN WATER FURNISHED FROM MAIN STREET WELL FIELD. THE COMPOUNDS DETECTED INCLUDED TRICHLOROETHYLENE (TCE), 1,2-DICHLOROETHYLENE, 1,1,1-TRICHLOROETHANE AND 1,1-DICHLOROETHANE. CONCENTRATIONS OF CONTAMINANTS RANGED FROM 2.0 PARTS PER BILLION (PPB) OF 1,1-DICHLOROETHANE TO 94 PPB OF TCE.

THE SELECTED REMEDIAL ACTION INCLUDES CONSTRUCTION OF AIR STRIPPING FACILITIES TO REMOVE VOLATILE ORGANIC COMPOUNDS FROM THE CONTAMINATED FLOW FROM THE MAIN STREET WELL FIELD. THE TREATED WATER WILL BE DISCHARGED TO THE EXISTING WATER TREATMENT PLAN AND DISTRIBUTION SYSTEM. TOTAL CAPITAL COST OF THE SELECTED REMEDIAL ALTERNATIVE IS ESTIMATED TO BE $1,106,000 WITH O&M COSTS ESTIMATED TO BE AN ADDITION $158,000 PER YEAR.
 
Remedy:  CONSTRUCT AIR STRIPPING FACILITIES TO REMOVE VOLATILE ORGANIC COMPOUNDS FROM THE CONTAMINATED FLOW FROM THE MAIN STREET WELL FIELD. THE TREATED WATER WILL BE DISCHARGED TO THE EXISTING WATER TREATMENT PLANT AND DISTRIBUTION SYSTEM. THE OPERABLE UNIT SERVES A DUAL PURPOSE, PROVISION OF AN ALTERNATE WATER SUPPLY AND MANAGEMENT OF GROUNDWATER MIGRATION.
 
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