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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/R05-95/291
ROD Date:  06/30/1995
Operable Unit(s):  05
 
Media:  groundwater
 
Contaminant:  Benzo(a)pyrene, dibenz(a,h)anthracene, phenathrene, phenols, polyaromatic hydrocarbons (PAHs)
 
Abstract:  Please note that the text in this document summarizes the Record of Decision for the purposes of facilitating searching and retrieving key text on the ROD. It is not the officially approved abstract drafted by the EPA Regional offices. Once EPA Headquarters receives the official abstract, this text will be replaced.

The Reilly Tar and Chemical site (the site) is an 80-acre property where Reilly Industries (Reilly) operated a coal tar refinery and wood preserving plant. The site is located in the western part of the Twin Cities metropolitan area, in St. Louis Park, Minnesota. The approximate location of the site is west of Gorham, Republic and Louisiana Avenues, south of 32nd Street, east of Pennsylvania Avenu and north of Walker Street.

This ROD addresses the contamination in the Northern Area of the Platteville Aquifer underlying the site. The Northern Area is located adjacent to the site and is bounded by West 32nd Street to the north, Alabama Avenue to the east, Highway 7 to the south, and Louisiana Avenue to the west. The Platteville Aquifer is composed of glacially deposited sand and gravel, and begins at 70 fee and extends to 100 feet below the ground surface. There are no wells that use the Northern Area of the Platteville Aquifer for drinking water.

Between 1917 and 1972, Reilly operated a coal tar distillation and wood treatmen plant, known as the Republic Creosote Company, on 80 acres of land in St. Louis Park (the City). Wastewater containing creosote and coal tar from plant operations was discharged to a ditch that drained to a swamp south of the site.

Additional releases of creosote and coal tar resulted from drippings and spills onto the soil at the site. These releases led to extensive soil, surface water and groundwater contamination, not only at the site, but also in areas downstrea and downgradient from the site.

The major constituents of coal tar are phenolic compounds and Polynuclear Aromatic Hydrocarbons (PAHs). Some PAH compounds are carcinogenic and are a concern when they occur as contaminants in a source or potential source of drinking water.

Due to extensive residential development in the area around the site in the 1940 and 1950s, complaints about shallow well contamination became common. As a result of the continuing problems with air emissions, and soil and surface water contamination, the City and the Minnesota Pollution Control Agency (MPCA) filed suit against Reilly in 1970. In 1972, the City purchased the site from Reilly, and the plant was dismantled and removed. The City dropped its lawsuit against Reilly as a condition of the sale. The MPCA's suit was eventually dismissed as part of a comprehensive settlement in 1986. In the mid 1970s, Louisiana Avenue was constructed through the site and some multi-family housing units were constructed on the northern half of the site. I 1978, the Minnesota Department of Health (MDH) began a program to analyze water from municipal wells in the City and nearby communities for trace concentrations of PAHs. The City uses groundwater from the St. Peter, Prairie du Chien-Jordan, and Mt. Simon-Hinckley Aquifers as sources of drinking water. During the period from 1978 to 1981, the analytical program revealed unexpectedly high concentrations of PAHs in six city wells and one well in the city of Hopkins. A the PAH contamination in these municipal wells was discovered, the wells were closed.
 
Remedy:  The major components of the selected remedy include: the interception of contaminants by use of a gradient control well which will prevent the further spread of contaminated groundwater in the Northern Area of the Platteville Aquifer; the discharge from the new well will initially be routed to the sanitar sewer for treatment at the Metropolitan Council Environmental Services wastewate treatment plant to remove contaminants from the collected groundwater; continued water level and water quality monitoring of the groundwater contaminant plume during remediation activities; within three to five years, it is anticipated tha the water quality of groundwater pumped from the gradient control well will be improved sufficiently to meet National Pollutant Discharge Elimination System (NPDES) limits - this would allow the city to route the groundwater pumped from the gradient control well to a storm sewer for eventual discharge to the Minnehaha Creek; and if necessary, an off-site treatment facility will be built to treat groundwater discharge from the gradient control well and a NPDES permit will be obtained for the discharge from such facility.
 
Text:  View full-text ROD [ 52K ]
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