Record of Decision System (RODS)
PENTA WOOD PRODUCTS
|Site Name:||PENTA WOOD PRODUCTS|
|Address:||8682 STATE RD 70, DANIELS TOWNSHIP|
|City & State:||DANIELS WI 54872|
|NPL Status:||Currently on the Final NPL|
|ROD Type:||Record of Decision|
|Media:||Air, Groundwater, Other, Sediment, Soil, Surface Water|
|Contaminant:||Base Neutral Acids, Inorganics, Metals, PAH, Pesticides, Petroleum Hydrocarbon, VOC|
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 Penta Wood Products (PWP) site is an inactive wood treating facility located on Daniels 70 (former State Route 70) in Burnett County, Wisconsin. The Village of Siren, Wisconsin, is approximately two miles east of the site and there are two residences within 200 feet of the site using private wells. The PWP property currently consists of approximately 82 acres which were actively used and 40 undeveloped acres consisting of forest were sold after the facility closed. The property is located in a rural agricultural and residential setting and is bordered by forested areas; some of these areas are classified by the State of Wisconsin as wetlands.
Groundwater at the PWP site occurs both in a thin unconfined aquifer and within a multi-layered semiconfined aquifer system. A number of surface water bodies are present north and east of the site. Doctor Lake and an unnamed lake are located 2,000 feet east and northeast of the site, respectively. Approximately 2,137 acres of lakes, 94 acres of bogs, and 7,500 acres of wetland are located within a four-mile radius of the site.
PWP operated from 1953 to 1992. Raw timber was cut into posts and telephone poles and treated with either a five to seven percent pentachlorophenol (PCP) solution in a No.2 fuel oil carrier, or with a water borne salt treatment called Chemonite consisting of ammonia, copper II oxide, zinc and arsenate (ACZA). PWP also conducted toll blending of PCP and fuel oil on a contract basis for other industrial users just prior to closing in 1992. PWP discharged wastewater from an oil/water separator down a gully into a lagoon on the northeast corner of the property. Process wastes were also discharged onto a wood chip pile in the northwestern portion of the property. Ash from a boiler was used to berm a cooling pond. The Wisconsin Department of Natural Resources (WDNR) investigators noted several large spills, stained soils, fires, and poor operating practices.
PWP began an environmental investigation in 1987. In 1988, the on-site production well was closed for potable use when it was found to contain 2,700 parts per billion (ppb) of PCP. The State of Wisconsin Department of Justice filed a preliminary injunction against PWP in 1991, citing Wisconsin Pollutant Discharge Elimination System (WPDES) violations and violations of other State statutes regarding storage of raw materials, and waste handling practices. The facility voluntarily closed in May 1992.
Based upon currently available information, Penta Wood Products, Inc. (Penta Wood) is the only potentially responsible party (PRP) at the PWP site. Penta Wood was the owner and operator of the site at the time of disposal of hazardous substances including PCP and arsenic. Legal title to the property is still held by Penta Wood.
A removal action was conducted from 1994 to 1996. The ACZA treatment building and half of the oil/water separator building were demolished and remaining chemicals and sludges were disposed off site. Grossly PCP-and metals-contaminated soils were excavated and disposed off site, and metals-contaminated soils were excavated and mixed with cement on site to form a three-acre concrete biopad. The nature and extent of contamination has been characterized in soil, sediment, surface water, and groundwater on and immediately north of the site. The media at this site are contaminated with a PCP/oil mixture. Emergency erosion control measures were taken in 1998 in an effort to reduce washout of contaminated wood debris from the lagoon wall into the wetlands. A Record of Decision (ROD) was issued in September 1998.
This final remedial action addresses contamination associated with the contaminated soils and sediments, surface water, a light non-aqueous phase liquid layer (LNAPL), and a groundwater plume at the Penta Wood Products Incorporated (PWP) site.
The selected remedial alternative for the PWP site includes: soil and sediment consolidation, bioventing, LNAPL collection and disposal, groundwater collection and treatment associated with LNAPL collection, and monitored natural attenuation for the remainder of the groundwater plume. The selected remedy focuses on removing free phase LNAPL and the grossly contaminated groundwater while slowly drawing down the water table and enhancing natural biodegradation of the soils above the LNAPL by bioventing. Pentachlorophenol (PCP)/fuel oil contaminated soils and sediments will be consolidated under a cover prior to bioventing. Arsenic/metals contaminated soil will be segregated where possible; highly contaminated soils will be solidified in cement and placed in a Corrective Action Management Unit (CAMU). The natural degradation of contaminants that is occurring in the groundwater plume will be monitored. If monitoring detects that off-site receptors are threatened, or if the remedy fails to effectively reduce contaminant mass within a reasonable time period, contingency plans will be implemented.
The major components of this remedy include: building demolition; segregation, select solidification, and placement of all arsenic soils in a CAMU; consolidation of PCP/fuel oil soils and wood chips under a soil cover; bioventing PCP/fuel oil contaminated material; biopad removal and backfill on site; erosion control measures; revegetation; LNAPL removal; grossly contaminated groundwater collection, treatment and discharge; monitored natural attenuation; institutional controls; environmental monitoring/maintenance; point-of-use carbon treatment, if necessary; and five-year site reviews.
Estimated Capital Costs: $3.8 million
Total O&M Costs: $4.4 million
Estimated Present Worth Costs: $8.2 million
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