Former Coke & Gas Site Remedial Investigation

Location: Southern Wisconsin

Client: Confidential

The site historically was home to several industrial activities, primarily a coke and gas production facility from the late 1800s through the early 1980s. Another area of the site was occupied by railroad, blast furnace and tannery companies. Blast furnace and tannery operations at the site generally ceased before 1937 and 1950, respectively. Most recently, the site has been used for recyclable materials management (e.g., concrete, brick and steel). The site is approximately 46 acres and is bordered by a river and active rail lines.

  • Test trenches
  • Stockpile sampling
  • Soil boring and sampling
  • On-site direct sensing (MIP)
  • Monitoring well installation
  • Groundwater sampling
  • Hydraulic conductivity testing
  • Limited asbestos removal

Under an Administrative Order on Consent (AOC) with the U.S. Environmental Protection Agency, a remedial investigation (RI) and feasibility study are being conducted at the site. The RI includes test trenching to identify underground structures and observe the shallow subsurface conditions. A membrane interface probe (MIP) was used to obtain an understanding of the subsurface conditions along with potential sources of impact before advancement of soil borings.

Push-probe soil borings were completed to confirm the results from the MIP, map the subsurface geology and collect soil samples for laboratory analysis. After the soil sampling work was complete, groundwater monitoring wells were installed along site boundaries and near former tanks and operations in internal areas to assess groundwater flow direction, groundwater elevations and potential impacts to groundwater.

Soil samples were also collected from groundwater monitoring well locations to supplement the soil sampling data. The data was then evaluated to develop an understanding of the nature and extent of impacts in the upland portion of the site. A total of six quarters of groundwater elevation measurement and sample collection is ongoing to determine impacts to the groundwater at the site.

Sediments samples were collected from the river adjacent to the site after the upland investigation activities. Sediment core sampling locations were defined based on existing nature and extent data, locations with data needs for the feasibility study and for forensic (i.e., source identification) purposes.