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Record of Decision System (RODS)



City & State:  ST. LOUIS PARK  MN  55426
EPA ID:  MND980609804
EPA Region:  05
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-92/213
ROD Date:  09/30/1992
Operable Unit(s):  03
Media:  Groundwater
Contaminant:  Organics
Abstract:  SITE HISTORY/DESCRIPTION: The 80-acre Reilly Tar and Chemical (St. Louis Park) site is a former coal tar distillation and wood preserving plant in St. Louis Park, Minnesota. Surrounding land use is predominantly residential. The site overlies a complex system of six 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 bedrock aquifers. From 1917 to 1972, coal tar distillation process wastewater was discharged to onsite surface water; as a result, small wastewater spills occurred 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. Four previous RODs in 1984, 1986, 1990, and 1992 addressed remediationof specific aquifers, the filling of a small onsite wetland, and offsite soil contamination. This ROD addresses a final remedy for the contaminated Northern Area of the Drift Aquifer, which is a surficial aquifer that is not used as a drinking water source. This aquifer does provide recharge water for the bedrock aquifers and is hydraulically and geologically connected to the Platteville and St. Peter Aquifers. Future RODs will address the remaining contamination problems presented by the site. The primary contaminants of concern affecting the ground water are organics, includingPAHs. PERFORMANCE STANDARDS OR GOALS: Chemical-specific ground water clean- up goals are based on sitespecific Drinking Water Criteria. These levels, developed by state and EPA experts, include benzo(a)pyrene and dibenzo(a,h)anthracene 5.6 ug/l; carcinogenic PAHs 28 ug/l; and other PAHs 15 ug/l. INSTITUTIONAL CONTROLS: Not applicable.
Remedy:  SELECTED REMEDIAL ACTION: The selected remedial action for this site includes intercepting and containing contaminated ground water using gradient control wells; discharging the water offsite for treatment at the local POTW; and continued monitoring the discharged water to determine if within 3 to 5 years, this could be discharged directly to a storm sewer and then to surface water. At that time, if necessary, an onsite or offsite treatment facility will be built to treat the water using activated carbon, prior to discharge, with regeneration and reuse of any spent carbon. The estimated capital cost for this remedial action is $370,000, per extraction well, and if the offsite treatment facility is deemed necessary, additional capital costs are estimated at $300,000, with an estimated annual O&M cost of $45,000 per extraction well for 30 years.
Text:  View full-text ROD [ 41K ]
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