| 22.__Archaeological excavation.__Archaeological excavation |
| adjacent to a great pond, freshwater wetland, coastal wetland, |
| sand dune system, river, stream or brook as long as the |
| excavation is conducted by an archaeologist listed on the Maine |
| Historic Preservation Commission level 1 or level 2 approved |
| list, and that unreasonable erosion and sedimentation is |
| prevented by means of adequate and timely temporary and permanent |
| stabilization measures. |