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HRS Rule, Table 6-1, Page 51651

Factor categories and factors Maximum value Value assigned
 
Likelihood of Release    
1. Observed Release 550 ——
2. Potential to Release:    

2a. Gas Potential to Release

500 ——

2b. Particulate Potential to Release

500 ——

2c. Potential to Release (higher of line 2a and 2b)

500 ——
3. Likelihood of Release (higher of lines 1 and 2c) 550 ——
 
Waste Characteristics    
4. Toxicity/Mobility (a) ——
5. Hazardous Waste Quantity (a) ——
6. Waste Characteristics 100 ——
 
Targets    
7. Nearest Individual 50 ——
8. Population:    

8a. Level I Concentrations

(b) ——

8b. Level II Concentrations

(b) ——

8c. Potential Contamination

(b) ——

8d. Population (lines 8a + 8b + 8c)

(b) ——
9. Resources 5 ——
10. Sensitive Environments    

10a. Actual Contamination

(c) ——

10b. Potential Contamination

(c) ——

10c. Sensitive Environments (lines 10a + 10b)

(c) ——
11. Targets (lines 7 + 8d + 9 + 10c) (b) ——
 
Air Migration Pathway Score    
12. Pathway Score (Sa) [(lines 3 x 6 x 11)/82,500]d 100 ——

a Maximum value applies to waste characteristics category.

b Maximum value not applicable.

c No specific maximum value applies to factor. However, pathway score based solely on sensitive environments is limited to maximum of 60.

d Do not round to nearest integer.

 

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