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Prioritization Criteria

Five criteria and associated weighting factors are used to classify threats that contaminants may pose. These include risks to human population exposed, contaminant stability, contaminant characteristics, threat to a significant environment, and program management considerations.

Each criteria is ranked on a scale of one to five. The highest score for any criteria is five, representing a current risk-current exposure scenario posing risk to human health and the environment. The lowest score for a factor is one, representing a future risk-future exposure scenario.

Factor Weight
A. Risks to human population exposed: Population size, proximity to contaminants, likelihood of exposure. 5
B. Stability: Mobility of contaminant, site structure, and effectiveness of any institutional or physical controls. 5
C. Contaminant characteristics: Concentration, toxicity and volume. 3
D. Threat to a significant environment: Endangered species or their critical habitats, sensitive environmental areas. 3
E. Program measurement consideration: Innovative technologies, cost delays, high profile projects, environmental justice, state involvement, Brownfields/economic redevelopment. 4

The raw score for each factor is multiplied as follows to obtain the maximum score:

Raw Score Range x Weight Factor = Maximum Total Score
A. Population exposed 1 - 5 x 5 25
B. Stability 1 - 5 x 5 25
C. Contaminant characteristics 1 - 5 x 3 15
D. Threat to significant environment 1 - 5 x 3 15
E. Program management considerations 1 - 5 x 4 20
Maximum total project score 100

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