Risk 101 & Remediation Design

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Courtesy of Courtesy of Arcadis

Risk Assessment is the basis for almost all of our designs. Perceived risk is the basis for the rest of the designs. A good remediation design must incorporate the concentration goals for that site and the designer must know how those goals were set. In order to know how those goals were set, we all must have a basic understanding of Risk Assessment. Not just the numbers, but the methodology that developed those numbers.

Can you answer the following questions?

  • How can 50 ppb of Benzene be toxic in groundwater 50 feet below ground, but 2000 ppm of Benzene not be toxic in gasoline two feet from you in your car’s gas tank?
  • How can 5 ppb of Phenol be toxic in drinking water, but 14,000 ppm of phenol be sprayed directly into your throat with cold products like Chloraseptic?
  • How can the various chemicals from cigarettes be proven to be toxic but not be regulated?

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