| N | Case | CfiST OR CfiLT | Contamination Level | |
| Short term use | Long term use | |||
| 1 | (CAi) less than 1/2 (CNiST) | (CAi) less than 1/2 (CNiLT) | <−0.5 | Safe |
| 2 | (CAi) = 1/2 (PC) OR = (CNiST) | (CAi) = 1/2 (CNiLT) OR = (CNiLT) | ≥−0.5 - <1 | Risky |
| 3 | (CAi) > (CNiST) | (CAi) > (CNiLT) | ≥1 | Polluted |