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Highlight 9-18 : Approximate Nearby Population Threat Scores

Area of Observed Contamination Likelihood of Exposure Population Density (people per square mile)
50 100 500 1,000 5,000 10,000 50,000
1.8 acres 500 1 1 1 2 9 13 83
375 1 1 1 1 7 10 62
250 0 0 1 1 4 7 41
125 0 0 0 1 2 3 21
50 0 0 0 0 1 1 8
25 0 0 0 0 0 1 4
5 0 0 0 0 0 0 1
  
126 acres 500 1 1 2 4 13 32 100
375 1 1 1 3 10 24 95
250 0 0 1 2 7 16 63
125 0 0 0 1 3 8 32
50 0 0 0 0 1 3 13
25 0 0 0 0 1 2 6
5 0 0 0 0 0 0 1
  
3.2 square miles 500 1 1 3 6 27 58 100
375 1 1 2 5 20 43 100
250 0 1 2 3 14 29 100
125 0 0 1 2 7 14 66
50 0 0 0 1 3 6 26
25 0 0 0 0 1 3 13
5 0 0 0 0 0 1 3

aThe scores presented in this table assume a waste characteristics factor category value of 100, nearby individual factor value equal to one, concentric travel distance categories, and uniformly distributed population (see text). Also, these values reflect the nearby population threat's overall effect on the soil exposure pathway score (i.e., they are divided by 82,500).

 

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