PID values showed 94% reduction in the values of fumes below the slab while the carbon dioxide values showed continued bacterial activity during the process. As the soil beneath or ground water showed any contamination, the project was closed.
Science for Environment Policy
Potentially toxic elements in European soils mapped by researchers.A new study has mapped levels of chemical elements found in Europe a aoricultTal soils. In most places, unusually high concentrations are linked t geology, such as high levels of arsenic in the Massif Central in France. Huma.. activity is to blame in some small areas, for example high concentrations of mercury were found near London and Paris. Abnormal concentrations, both too low and too high, could pose an environmental risk. This new...
Watershed Project Presents Challenges
Dennis McAlpine, P. E., project engineer at Houston Engineering, Inc. (HEI) acknowledges he enjoys a professional challenge. He has one. And so do several other folks connected with a $3 million water management project to clean up lakes in the Rice Creek Watershed District (RCWD), as well as other projects. The district is in the north/northeast sector of the metropolitan area and includes parts of Hennepin, Ramsey, Anoka and Washington counties. Communities in the district include Arden Hills, Blaine, Columbia...
Ground Water Remediation Case Study
The Pine Street Barge Canal Superfund Site is located along the coast of Lake Champlain. Sediments in the canal were contaminated by historic dumping of various materials including coal tar, solvents and petroleum products. Terra Contracting Services, LLC (Terra) was retained to implement the remedial design. Terra subcontracted with Global Environmental Engineering Inc. (Global) to provide projectmanagement services to assure the project was constructed according specifications within the specified schedule and...
White Paper: Soil Data Quality Control
Why it is essential during a contaminated soil study? Before starting an evaluation of the contamination leading to decision-making tools for site clean-up, it is essential to ensure data quality. Thus, based on solid and reliable foundations, uncertainties occurring during the different steps of the decision process will be better controlled and the final quality of the project improved. The objective of this white paper is to assess at best the validity of the data through visual, statistical and geostatistical...
Bioswales reduce contaminants associated with toxicity in urban stormwater
Contamination and toxicity associated with urban stormwater runoff are a growing concern because of the potential for receiving system impacts. California water regulators are mandating implementation of green infrastructure as part of new urban development projects to treat stormwater and increase infiltration. Parking lot bioswales are low impact development practices that promote filtering of runoff through plants and soil. Studies have demonstrated that bioswales reduce concentrations of suspended sediments,...