Sec. 1. 38 MRSA §490-D, sub-§5-A, as amended by PL 1995, c. 700, §24, is further amended to read:

5-A. Protected natural resources. A natural buffer strip must be maintained between the working edge of an excavation and a river, stream, brook, great pond or coastal wetland as defined in section 480-B. A natural buffer strip must also be maintained between the working edge of an excavation and certain freshwater wetlands as defined in section 480-B and having the characteristics listed in paragraph B. Excavation activities conducted within 100 feet of a protected natural resource must comply with the applicable permit requirement under article 5-A. The width requirements for natural buffer strips are as follows.

A. A natural buffer strip at least 100 feet wide must be maintained between the working edge of the excavation and the normal high water line of a great pond classified as GPA or a river flowing to a great pond classified as GPA.

B. A natural buffer strip at least 75 feet wide must be maintained between the working edge of the excavation and any other water body, river, stream, brook, coastal wetland or significant wildlife habitat contained within a freshwater wetland or a freshwater wetland consisting of or containing:

(1) Under normal circumstances, at least 20,000 square feet of aquatic vegetation, emergent marsh vegetation or open water, except for artificial ponds or impoundments; or

(2) Peat lands dominated by shrubs, sedges and sphagnum moss.

For purposes of this subsection, the width of a natural buffer strip is measured from the upland edge of floodplain wetlands; if no floodplain wetlands are present, the width of the natural buffer strip is measured from the normal high water mark of a great pond, river, stream or brook or the upland edge of a freshwater or coastal wetland. The department may not grant a variance from this subsection, except that the department may grant a variance from paragraph B to permit a lesser width requirement between the working edge of the excavation and a river, stream or brook, as long as the variance will not result in the natural buffer strip being reduced to less than 25 feet and as long as the owner or operator undertakes safety measures required by the department.