Chemical Hazards

To determine if a Chemical Hazard exists, site chemical data are screened against environmental quality guidelines (e.g., the CCME Environmental Quality Guidelines (external link) and Health Canada Drinking Water Guidelines (external link)). Concentration data is first summarized by calculating the mean, 95% upper confidence limit of the mean (UCLM), 95th percentile and maximum concentration.The summary statistics are then screened against the environmental quality guidelines. In addition to statistical summaries of concentrations, other information may need to be collected (e.g., for soil data).