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Record of Decision System (RODS)

CONRAIL RAIL YARD (ELKHART)

Abstract

Site Name:  CONRAIL RAIL YARD (ELKHART)
Address:  SR 33 
City & State:  ELKHART  IN  46514
County:  ELKHART
 
EPA ID:  IND000715490
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-91/159
ROD Date:  06/28/1991
Operable Unit(s):  01
 
Media:  GROUNDWATER
 
Contaminant:  VOCS, CARBON TETRACHLORIDE, TCE
 
Abstract:  THE 2,500-ACRE CONRAIL RAILYARD ELKHART SITE IS COMPOSED OF A 675-ACRE RAILROAD FACILITY AND ADJACENT AREAS OF CONTAMINATION TO THE NORTHEAST AND NORTHWEST IN ELKHART COUNTY, INDIANA. MAJOR SURFACE WATER BODIES IN THE VICINITY ARE THE ST. JOSEPH RIVER, LOCATED 1 MILE NORTH OF THE SITE, AND THE BAUGO BAY LOCATED TO THE WEST OF THE SITE, WHICH HAVE ADJACENT WETLANDS AND FLOODPLAIN AREAS. FROM 1956 TO THE PRESENT, THE SITE HAS BEEN USED AS A CLASSIFICATION AND DISTRIBUTION POINT FOR RAIL FREIGHT CARS. CAR REPAIR, ENGINE CLEANING, AND DIESEL REFUELING ACTIVITIES WERE CONDUCTED ONSITE. REPORTED ONSITE SPILLS AND RELEASES OF OIL, DIESEL FUEL, HYDROCHLORIC ACID, CAUSTIC SODA, AND VARIOUS PETROLEUM-RELATED SUBSTANCES FROM 1976 TO 1986 HAVE OCCURRED ONSITE. EPA INVESTIGATIONS DURING THE MID-1980S DETECTED ELEVATED LEVELS OF TCE IN GROUND WATER DOWNGRADIENT FROM THE RAILYARD, AND IN THE SUBSURFACE SOIL AT VARIOUS POINTS ONSITE. AFTER INITIALLY PROVIDING BOTTLED WATER, IN-HOUSE CARBON FILTERS WERE PROVIDED TO 76 RESIDENCES. THIS RECORD OF DECISION (ROD) PROVIDES FOR THE CONTAINMENT OF THE CONTAMINATED GROUND WATER PLUME, AS AN INTERIM ACTION, AND PROVIDES FOR A SAFE AND PERMANENT DRINKING WATER SUPPLY. A SUBSEQUENT ROD WILL ADDRESS CONTAMINATED SOIL AND GROUND WATER, AND SET FINAL GROUND WATER REMEDIATION LEVELS. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE GROUND WATER ARE VOCS INCLUDING TCE AND CARBON TETRACHLORIDE.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES PUMPING AND TREATMENT OF GROUND WATER USING PREFILTRATION AND AIR STRIPPING, AND DISCHARGING THE TREATED WATER ONSITE TO THE ST. JOSEPH RIVER; TREATING AIR EMISSIONS, IF NEEDED, USING CARBON ADSORPTION WITH OFFSITE REGENERATION AND DISPOSAL OF THE SPENT CARBON; CONDUCTING TREATABILITY STUDIES TO DETERMINE TREATMENT SYSTEM DESIGN PARAMETERS; PROVIDING AN ALTERNATE WATER SUPPLY BY EXTENDING THE MUNICIPAL DISTRIBUTION SYSTEM TO 505 RESIDENCES/BUSINESSES; MONITORING GROUND WATER; AND IMPLEMENTING INSTITUTIONAL CONTROLS, INCLUDING GROUND WATER USE RESTRICTIONS, AND SITE ACCESS RESTRICTIONS SUCH AS FENCING. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $3,969,300, WHICH INCLUDES AN ANNUAL O&M COST OF $125,000 FOR 20 YEARS.

PERFORMANCE STANDARDS OR GOALS; FINAL SOIL AND GROUND WATER PERFORMANCE STANDARDS WILL BE ADDRESSED DURING REMEDIATION OF OU2.
 
Remedy:  THIS GROUNDWATER INTERIM ACTION OPERABLE UNIT IS THE FIRST OF TWO OPERABLE UNITS PLANNED FOR THIS SITE. THIS OPERABLE UNIT ADDRESSES THE ELIMINATION OR REDUCTION OF PUBLIC EXPOSURE TO GROUNDWATER CONTAMINATION ASSOCIATED WITH THE SITE. SPECIFICALLY, THIS INTERIM REMEDIAL ACTION INVOLVES THE PROVISION OF A SAFE, PERMANENT DRINKING WATER SUPPLY TO RESIDENTS WHO ARE POTENTIALLY AT RISK, AND TAKING ACTIONS TO RESTRICT MIGRATION OF THE CONTAMINATION IN THE AQUIFER. THE SECOND OPERABLE UNIT WILL SET REMEDIATION LEVELS FOR CONTAMINATED SITE SOILS, AND CONTAMINATED GROUNDWATER AT THE SITE, AS WELL AS ACCOMPANYING AIR AND WATER MONITORING, SO AS TO PROPERLY MONITOR REMEDIATION/RECOVERY EFFORTS. THIS FIRST OPERABLE UNIT WORKS TOWARD THE GOAL OF ACHIEVING A PERMANENT REMEDY AT THE SITE.

THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDE;
* INSTALLATION OF FOUR EXTRACTION WELLS LOCATED IN POSITIONS TO ADEQUATELY CONTAIN THE MIGRATION OF CONTAMINANTS IN THE GROUNDWATER;
* TREATMENT OF GROUNDWATERS COLLECTED SUCH THAT THE RESULTANT DISCHARGE WILL MEET NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) LIMITATIONS AS IMPOSED BY THE PROGRAM ADMINISTERED BY THE STATE OF INDIANA;
* INSTALLATION OF ABOUT 67,000 FEET OF DISTRIBUTION LINE, OF VARIOUS SIZES, FOR THE DISTRIBUTION OF CITY OF ELKHART WATER TO APPROXIMATELY 505 RESIDENCES/BUSINESSES WHO ARE POTENTIALLY AT RISK FROM EXPOSURE TO THE CONTAMINATED GROUNDWATER;
* GROUNDWATER MONITORING TO ENSURE THE EFFECTIVENESS OF THE REMEDIAL ACTION; AND
* FENCING OF PROPERTY WHERE THE GROUNDWATER EXTRACTION FACILITIES ARE INSTALLED, AS WELL AS ADVISORIES AND POSSIBLE WELL ABANDONMENT FOR RESIDENCES AND BUSINESSES IN THE AREA OF GROUNDWATER CONTAMINATION.
 
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