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Record of Decision System (RODS)

REILLY TAR & CHEMICAL CORP. (ST. LOUIS PARK PLANT)

Abstract

Site Name:  REILLY TAR & CHEMICAL CORP. (ST. LOUIS PARK PLANT)
Address:  LOUISIANA & WALKER STREET 
City & State:  ST. LOUIS PARK  MN  55426
County:  HENNEPIN
 
EPA ID:  MND980609804
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-90/147
ROD Date:  09/28/1990
Operable Unit(s):  04
 
Media:  GROUNDWATER
 
Contaminant:  ORGANICS, PAHS, PHENOLS
 
Abstract:  THE 80-ACRE REILLY TAR & CHEMICAL (ST. LOUIS PARK) SITE IS A FORMER COAL TAR DISTILLATION AND WOOD PRESERVING PLANT IN ST. LOUIS PARK, MINNESOTA. THE SITE OVERLIES A COMPLEX SYSTEM OF AQUIFERS, INCLUDING THE ST. PETER AQUIFER THAT PROVIDE DRINKING WATER TO AREA RESIDENCES. THE ST. PETER AQUIFER CONTAINS ONE MUNICIPAL WELL, WHICH IS USED DURING PERIODS OF PEAK DEMAND, HOWEVER, THE MAJORITY OF THE DRINKING WATER IN ST. LOUIS PARK IS OBTAINED FROM DEEPER AQUIFERS. SURROUNDING LAND USE IS PRIMARILY RESIDENTIAL. FROM 1917 TO 1972, WASTEWATER CONTAINING CREOSOTE AND COAL TAR WAS DISCHARGED TO ONSITE SURFACE WATER, AND AS A RESULT, SMALL WASTEWATER SPILLS OCCURED INTO ONSITE SOIL. IN 1972, THE SITE WAS PURCHASED BY THE CITY IN RESPONSE TO COMPLAINTS ABOUT WASTEWATER CONTAMINATION, AND THE PLANT WAS DISMANTLED. STATE INVESTIGATIONS FROM 1978 TO 1981, IDENTIFIED SITE-RELATED GROUND WATER CONTAMINATION. TWO PREVIOUS RECORDS OF DECISION (RODS) IN 1984 AND 1986, ADDRESSED REMEDIATION OF SPECIFIC AQUIFERS, THE FILLING OF A SMALL ONSITE WETLAND, AND OFFSITE SOIL CONTAMINATION. THIS ROD ADDRESSES OPERABLE UNIT 4 (OU4), REMEDIATION OF THE ST. PETER AQUIFER. A SUBSEQUENT ROD WILL ADDRESS ANY REMAINING SITE PROBLEMS AS OU3. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE GROUND WATER ARE ORGANICS INCLUDING PAHS AND PHENOLS.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES PUMPING AN EXISTING WELL SCREENED WITHIN THE ST. PETER AQUIFER AND INITIALLY DISCHARGING THE EXTRACTED WATER OFFSITE TO A PUBLICLY OWNED TREATMENT WORKS (POTW); AND GROUND WATER MONITORING. WITHIN 3 TO 5 YEARS, DIRECT ONSITE DISCHARGE TO SURFACE WATER WILL BE CONDUCTED IF NPDES PERMIT REQUIREMENTS CAN BE MET. IF REQUIREMENTS ARE NOT MET, ONSITE TREATMENT, POSSIBLY USING GRANULAR ACTIVATED CARBON, WILL BE CONDUCTED PRIOR TO ONSITE DISCHARGE. THE ESTIMATED CAPITAL COST FOR THIS REMEDIAL ACTION IS $225,000 TO $250,000, DEPENDING ON THE NEED FOR ONSITE TREATMENT. ANNUAL O&M COSTS ARE ESTIMATED AT $60,000.

PERFORMANCE STANDARDS OR GOALS: EXTRACTED GROUND WATER MUST MEET NPDES DISCHARGE REQUIREMENTS FOR BOTH DISCHARGE TO A POTW AND TO SURFACE WATER. CHEMICAL-SPECIFIC LEVELS INCLUDE CARCINOGENIC PAHS 70 UG/L, OTHER PAHS 17 UG/L, AND PHENOLS 10 UG/L. INSTITUTIONAL CONTROLS: NOT PROVIDED.
 
Remedy:  THE OBJECTIVES OF THE RESPONSE ACTIONS APPROVED FOR THE SITE ARE TO PROTECT PUBLIC HEALTH, WELFARE AND THE ENVIRONMENT AND TO COMPLY WITH APPLICABLE FEDERAL AND STATE LAWS. THE ST. PETER AQUIFER REPRESENTS ONE OPERABLE UNIT WITHIN THE OVERALL SITE STRATEGY. THIS REMEDY ADDRESSES ONLY THE ST. PETER AQUIFER, AND WILL CONTAIN THE SPREAD OF CONTAMINATED GROUND WATER OF POLYNUCLEAR AROMATIC HYDROCARBON (PAH) CONTAMINATION IN THIS AQUIFER.

THE MAJOR COMPONENTS OF THE SELECTED REMEDY INCLUDE;

* THE INTERCEPTION AND CONTAINMENT OF CONTAMINANTS BY PUMPING WELL NUMBER W410 AT A RATE OF 65 TO 100 GALLONS PER MINUTE.
* THE DISCHARGE FROM THE WELL WILL INITIALLY BE ROUTED TO THE SANITARY SEWER FOR TREATMENT AT THE METROPOLITAN WASTE CONTROL COMMISSION (MWCC) WASTEWATER TREATMENT PLANT TO REMOVE CONTAMINANTS FROM THE COLLECTED GROUND WATER.
* CONTINUED WATER LEVEL AND WATER QUALITY MONITORING OF THE GROUND WATER CONTAMINANT PLUME DURING PUMPING REMEDIATION ACTIVITIES. THIS IS NOT ONLY TO DOCUMENT THE EFFECTIVENESS OF THE REMEDY BUT ALSO TO DETERMINE THE NEED FOR ON-SITE TREATMENT.
* WITHIN THREE TO FIVE YEARS, MPCA ANTICIPATES THAT THE WATER QUALITY OF GROUND WATER PUMPED FROM W410 WILL BE IMPROVED SUFFICIENTLY TO MEET NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) LIMITS. THIS WOULD ALLOW MPCA TO ROUTE THE GROUND WATER PUMPED FROM W410 TO A STORM SEWER FOR EVENTUAL DISCHARGE TO MINNEHAHA CREEK. IF NECESSARY, AN ON-SITE TREATMENT FACILITY WILL BE BUILT TO ENSURE THAT THE GROUND WATER MEETS NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) LIMITS.
 
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