The multistep remedy started in March 2008. First, the 11,000 cu yd (8400 m³) of surface soil containing > 1 ppb of dioxin was excavated. Next, 55,000 cu yd (42,000 m³) of waste pond sediment and 8,000 cu yd (6,000 m³) of a CCA pile was unearthed. The final step was the exvacation of 600 cu yd (500 m³) of creek sediment.

These materials were staged for treatment and pre-blended with 10% fly ash. The pre-blended material was processed through a pugmill where 10% portland cement was added. The S/S-treated material was then placed and compacted over the former pond areas to form a very low permeability cap. Slurry walls will be used to provide additional containment and control groundwater infiltration at the former pond areas. The treatment and slurry walls will be completed in the summer of 2008.

More on Superfund sites.

Brunswick Site Subject of Seminar/Tour

One of the best ways for remediation site decision makers to learn about S/S treatment is to tour an active project. On April 22, PCA and the Southeast Cement Association sponsored a seminar and site tour of contaminated soils treated with cement solidification/stabilization.

After a morning of presentations, the 67 participants toured the Brunswick Wood Superfund Site, Brunswick, Ga. (see previous story). More than 60,000 cubic yards (45,900 m³) of contaminated soils and sediments are being treated with cement-based S/S at the 84-acre (34-hectacre) former wood-treating facility.

The seminar included presentations by EPA's expert on S/S, EPA's Remedial Project Manager for the Brunswick Wood Superfund Site, a researcher on long-term effectiveness of S/S, and S/S contractors.

Cooling Pond Project Complete at Sydney Tar Ponds Site

The Sydney Tar Ponds and Coke Ovens Site in Nova Scotia is Canada's largest contaminated site clean-up project. One of the first portions of the project to be successfully remediated has used cement-based solidification/stabilization.

The cooling pond was an old circular reservoir, built in 1912 to hold water once used in the steelmaking process. Sediment in the cooling pond was impacted by total petroleum hydrocarbons (TPHs), volatile organic compounds (VOCs), polycyclic aromatic hydrocarbons (PAHs), and metals. S/S treatment of the cooling pond sediment involved mixing 6,100 metric tons (6,700 tons) of cement into 29,000 m³ (38,000 cu yd) of contaminated sediment. More.

Updated Directory Available

PCA receives requests from waste management and remediation project decision-makers for lists of companies experienced in conducting S/S treatability studies or full-scale S/S treatment. PCA is constantly updating a directory of such companies. Click here for the most current copy of the directory.

Click here to complete an application to be considered for listing in this directory.

Do you have an S/S project that you would like to show-off to decision makers? PCA can work with you to highlight the project in this newsletter, as a published project information sheet or site tour. Contact Chuck Wilk at PCA.

Waste Conference Features Technology Update

PCA organized a Technology Update session at the Waste Conference produced by the Lake Michigan Chapter of Air and Waste Management Association held in Chicago on April 15, 2008. Presentations were made on:

Brownfields 2008 Goes Green

At the EPA-sponsored National Brownfields Conference held this month in Detroit, Mich., PCA exhibited cement-based products that contribute to the sustainable redevelopment of contaminated properties. PCA's exhibit included a working model of pervious concrete pavement. There was an increased interest in "green" remediation. In-situ treatment and reuse of treated material can contribute to sustainable redevelopment of brownfield sites.

Remediation Technologies Symposium 2008 (RemTechTM 2008)
October 15-17, 2008, Banff, Alberta

U.S. Green Building Council's Greenbuild International Conference and Expo
November 19-21, 2008, Boston, Mass.