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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