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|
|ROD Type:||Record of Decision|
The MacGillis and Gibbs Co./Bell Lumber and Pole Co. National Priority List (NPL) Site consists of two adjacently located wood preserving facilities. The Bell Lumber and Pole Co. facility is located on the western portion of
the Site and the MacGillis and Gibbs Co. facility is on the eastern portion of the Site (See Figure 1). Each of these facilities has been involved in wood preserving activities since the 1920s, and both are still active today.
The MacGillis and Gibbs Co. facility and the Bell Lumber and Pole Co. facility were included as one site on the NPL because of their adjacent locations and similarities of processes and contaminants.
The MacGillis and Gibbs Co. portion of the MacGillis & Gibbs Co./Bell Lumber and Pole Site Co. will be referred to as "the Site" in the remainder of this Record of Decision (ROD). However, the MacGillis & Gibbs and Bell Lumber & Pole Co. properties are listed on the NPL as a single site, and EPA regards them as a single site for enforcement purposes. Similarly, the disposal pit area which is Operable Unit 1 of the Site will be referred to as "DPA-OU". The Site encompasses 24 acres in the SE 1/4 of Section 29, Township 30 North, Range 23 West, Ramsey County, Minnesota. The Site is located at 440 5th Avenue NW in the city of New Brighton. It is bounded to the east by 5th Avenue NW, to the south by 1st Street, to the north by private residential land, and to the west by the Minnesota Transfer Railroad and Bell Lumber and Pole Company (Figure 1).
This ROD addresses the disposal pit area (called the Soil Disposal Area in the Focused Feasibility Study (FFS) conducted by Malcolm Pirnie, Inc.) in the west-central portion of the Site (Figure 2). Elevations across theSite
range from approximately 906 feet to 920 feet above mean sea level and generally slopes toward the south and east. The disposal area was initially a topographic depression subsequently filled with scrap posts and poles,
wood chips, settled solids, and spent treatment solutions from the pentachlorophenol (PCP) process. The southwest corner of the soil disposal area is ponded yearround. A pipeline in an easement owned and operated by Williams Pipeline Company of Tulsa, Oklahoma passes through the disposal area. The contaminated soils in the disposal pit area are a continuing source of contamination to the underlying ground water.
According to Twin City Testing Corporation's (TCT) November 1985 Site Evaluation Report, the area geology consists primarily of three unconsolidated stratigraphic units and two bedrock units which underlie the
Site. In descending stratigraphic order, the unconsolidated unit includes the New Brighton Formation (silty, fine to medium-grained sands with intermediate and laterally discontinuous silt and sand lenses), the Twin
Cities Till Formation (silty to sandy clay till with silt and sand lenses), and the Hillside Sand Unit (medium to coarse-grained pebbly sand with local cobble zones). The bedrock unit includes the St. Peter Sandstone Formation (friable sandstone with a shaley layer near the bottom) and the Prairie du Chien Formation (dolomite with some local sandstone). These stratigraphic units are illustrated in Figure 3. The ground water aquifers beneath the Site are, in descending order: the surficial aquifer, in which the water table occurs at a depth of 10 to 20 feet below ground; the Hillside Sand Aquifer which is separated from the surficial aquifer by the Twin Cities
Till Formation which acts as a barrier and inhibits downward flow of ground water from the surficial aquifer; and the bedrock aquifers, the St. Peter and Prairie du Chien.
This remedy addresses only Operable Unit 1 (DPA-OU). The remedy will eliminate the spread of PCP, polynuclear aromatic hydrocarbons (PAHs), chromium and arsenic into the ground water from the disposal pit area. In addition, removal of the surface soils will eliminate the direct contact threat to humans.
The major components of the selected remedy include:
1. Fencing of the disposal area.
2. Excavation of soil and debris to an approximate depth of 10 feet (or until no more debris or contaminated soil is found) within the perimeter of the disposal area. Excavation work will include dewatering of soils and the
disposal area pond;
3. Separation of non-burnable debris, wood debris, and soils;
4. Rinsing and landfilling or recycling of non-burnable debris (concrete blocks, empty barrels, metal strapping, etc.);
5. Drying and incineration of wood debris;
6. Treatment and/or disposal of bottom ash in a landfill or onsite.
7. Treatment and disposal of fly ash in a landfill;
8. Soil washing of contaminated soils and separation of sandy soils from the fine-grained soils;
9. Treatment of contaminated fine-grained soils through bioremediation, incineration, and/or solidification/stabilization;
10. Backfilling of treated soils in the disposal area excavation.
11. Discharge (and possible treatment) of soil washing effluent, rinse water from non-burnable debris, and water from the dewatering operation to the Publicly Owned Treatment Works (POTW);
Treatability studies will be performed on the selected remedial actions (soil washing, water pretreatment system, bioremediation, solidification/stabilization) to determine their effectiveness. If treatability studies for soil washing indicate that this technology would not be effective, a contingency remedy of incineration of all contaminated material (See Alternative 2 in the attached ROD Decision Summary) may then be implemented.
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