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Table 3-1 of the HRS Rule

Factor categories and factors Maximum value Value assigned
 
Likelihood of Release to an Aquifer:    
1. Observed Release 550 ——
2. Potential to Release:    
   2a. Containment 10 ——
   2b. Net Precipitation 10 ——
   2c. Depth to Aquifer 5 ——
   2d. Travel Time 35 ——
   2e. Potential to Release [lines 2a(2b+2c+2d)] 500 ——
3. Likelihood of Release (higher of lines 1 and 2e) 550 ——
 
Waste Characteristics:    
4. Toxicity/Mobility {a} ——
5. Hazardous Waste Quantity {a} ——
6. Waste Characteristics 100 ——
 
Targets:    
7. Nearest Well 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. Wellhead Protection Area 20 ——
11. Targets (lines 7+8d+9+10) {b} ——
 
Ground Water Migration Score for an Aquifer:    
12. Aquifer Score [(lines 3x6x11)/82,500]c 100 ——
 
Ground Water Migration Pathway Score:    
13. Pathway Score (Sgw), (highest value from line 12 for all aquifers evaluated)c. 100 ——


a Maximum value applies to waste characteristics category.

b Maximum value not applicable.

c Do not round to nearest integer.

 

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