Record of Decision System (RODS)
MACGILLIS & GIBBS CO./BELL LUMBER & POLE CO.
|Site Name:||MACGILLIS & GIBBS CO./BELL LUMBER & POLE CO.|
|Address:||440 5TH AVE NW|
|City & State:||NEW BRIGHTON MN 55112|
|NPL Status:||Currently on the Final NPL|
|Operable Unit(s):||01, 03|
A number of studies were conducted from 1981-1987 to define the extent of contamination. In 1988, US EPA monitored some initial cleanup activities being performed by the M&G Company. Approximately 200 deteriorated drums of pentachlorophenol process wastes were stabilitzed in overpack drums and placed in a newly constructed storage facility. A LNAPL plume was also detected and a pump out well was installed to begin the removal of this plume. In 1990 a Focused FS was conducted by USEPA which found contamination of soils in the wood treating areas and in abandoned tanks and the ground water. During 1993, US EPA removed 700 drums of process wastes and alos contaminated soils from the LNAPL plume. US EPA completed its RI/FS for OU-3 in 1994. The RI sampling determined that there were about 30,000 cubic yards of organics-contaminated soils in and around the pentachlorophenol process area and approximately 19,000 cubic yards of metal-contaminated soils in and around the chromated copper arsenate process area. The New Brighton Aquifer was found to be contaminated and was moving off-site to the northeast. Bell entered into an agreement with the Minnesota Pollution Control Agency in 1985 to perform an investigation and cleanup of its facility. M&G did not enter a similar agreement and is being funded by the Superfund program.The MacGillis and Gibbs ( M&G) and Bell Lumber and Pole site consists of two adjacently located wood preserving facilities. The Bell facility is located on the western portion of the site and the M & G facility is located on the east. The facilities are located in a mixed residential and commercial area in the City of New Brighton, Ramsey County, Minnesota. Residences lie to the north, northeast, northwest, and southwest of the site. The site is bordered on the south by First Street NW, on the west by Eighth Avenue NW, on the north partly by 5th Street NW and on the east by Fifth Avenue NW. Wetland areas are located northeast and northwest of the site. A number of surface water bodies are within 2 miles of the site. The aquifers at the site are called the New Brighton Aquifer and the Hillside Aquifer. Several of the lakes in the area are used for recreational purposes. Groundwater is used as a source of drinking water in the area. The site has been involved in wood preserving activities since the 1920s. In the 1979 the initial investigation at M&G was conducted after a spill of 4000 to 5000 gallons of chromated copper arsenate. The M&G Company closed in 1977. A Consent Decree for recovery of past costs under Section 107 of CERCLA was entered with M&G Company and filed with the court in July 1997.
The MacGillis portion of the site has been divided into three operable units (OU).
OU1 consists of contaminated soils and debris in an former disposal pit area on the west edge of the MacGillis facility and also organic contaminated soils from OU3 which have been combined with OU1 organic contaminated soils for a more effective remedial action. Removal of below ground tanks, vaults, and associated piping from OU3 is also included as part of OU1. EPA signed a Record of Decision (ROD) for OU1 in December 1992 and a ROD Amendment in September 1999.
OU2 consists of Light Nonaqueous Phase Liquid (LNAPL) in pentachlorophenol (PCP) process areaand residuals and sludges contained in abandoned above ground and below ground storage and process tanks. Removal and disposal of the above ground tanks and associated piping is also inlcuded as part of OU2. A remedial action for OU2 has been completed.
OU3 consists of contaminated soils (other than those addressed in OU1) and groundwater contamination. Contamination which has been moved off-site to the surrounding area, including small lakes, wetlands and a stream is also addressed in OU3. In September 1994, a ROD addressing OU3 was signed. The remedy selected in the ROD was a final remedial action and included the following major components: incineration of organics-contaminated soils, groundwater extraction and treatment of the contaminated groundwater, and solidification/stabilization of metals-contaminated soils, with off-site disposal. The last two items listed above have been implemented by EPA. The OU1 ROD Amendment addresses the organic contaminated soils of OU3.
The selected remedy for this Record of Decision (ROD) Amendment is Alternative 7, Remove Debris from Operable Unit 1 (OU1); Excavation and Consolidation of less contaminated OU3 soils into OU1; Install impermeable Resource Conservation and Recovery Act (RCRA) caps at OU1 and southern portion of OU3; On-site treatment of remaining OU3 soils in biopiles and reductive oxidation prior to off-site land disposal. The components of the selected remedy are as follows:
OU1 will be excavated to a depth of 10 feet. The debris will be screened, decontaminated if necessary and disposed of off-site in either a RCRA permitted incinerator or landfill in accordance with the RCRA Debris Rules (40 CFR 268.45). The remaining soil will be placed back in the excavation.
The northern portion of OU3 will be excavated to a depth of 16 feet. This material will be screened to remove debris which will be disposed of off-site in accordance with RCRA Debris Rules. Contaminated soils will be consolidated under the OU1 cap. The more heavily contaminated soils will be treated through a combination of biopiles and a chemical oxidation process. Clean backfill will be placed in the excavation. If site cleanup standards cannot be met, off-site disposal will take place in accordance with RCRA Land Disposal requirements (40 CFR 268.49).
The southern portion of OU3 will be excavated to an average depth of 6 feet. However the more heavily contaminated areas will be excavated to a depth of 12 feet. This material will be screened with the debris disposed of off-site. Soils will be consolidated or treated as described above for the northern portion of OU3. Clean backfill will be placed in the excavation.
To facilitate work on site a Corrective Action Management Unit (CAMU) will be designated in accordance with RCRA Rules. The southern portion of OU3 and OU1 will be capped with a RCRA Subtitle C cap equivalent. Institutional controls will be installed to guide future land use of the site. Long term operation and maintenance of the impermeable RCRA cap will be conducted by the state, as well as, provisions for operation and maintenance of any overlying parking lot that may be constructed over the cap.
If on-site soil treatment can achieve the site cleanup standards, soils will be placed on site rather than in an off-site landfill. Further, should on-site treatment fail to achieve land disposal treatment standards, the soils will be further treated in an off-site incinerator rather than disposed of in a landfill.
The selected remedy is a change from the soils remedy selected in the ROD from September 1994 and the OU1 ROD dated December 1992. However, the groundwater portion of the remedy remains as described in the 1994 ROD.
Estimated Capital Costs: $9,681,650
Estimated Annual O&M Costs: Not documented
Estimated Present Worth Costs: $9,905,012
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