| Environmental score | Range bands | Description of range bands |
| +72 to +108 | +E | Major positive change/impacts |
| +36 to +71 | +D | Significant positive change/impacts |
| +19 to +35 | +C | Moderately positive change/impacts |
| +10 to +18 | +B | Positive change/impacts |
| +1 to +9 | +A | Slightly positive change/impacts |
| 0 | N | No change/status quo/not applicable |
| −1 to −9 | −A | Slightly negative change/impacts |
| −10 to −18 | −B | Negative change/impacts |
| −19 to −35 | −C | Moderately negative change/impacts |
| −36 to −71 | −D | Significantly negative change/impacts |
| −72 to −108 | −E | Major negative change/impacts |