Sec. 4. 38 MRSA §465, sub-§3, śC, as enacted by PL 1985, c. 698, §15, is amended to read:

C. Discharges to Class B waters shall may not cause adverse impact to aquatic life in that the receiving waters shall must be of sufficient quality to support all aquatic species indigenous to the receiving water without detrimental changes in the resident biological community. This paragraph does not apply to aquatic pesticide or chemical discharges approved by the department and conducted by the department, the Department of Inland Fisheries and Wildlife or an agent of either agency for the purpose of restoring biological communities affected by an invasive species.

Sec. 5. 38 MRSA §465, sub-§4, śC, as enacted by PL 1985, c. 698, §15, is amended to read:

C. Discharges to Class C waters may cause some changes to aquatic life, provided that except that the receiving waters shall must be of sufficient quality to support all species of fish indigenous to the receiving waters and maintain the structure and function of the resident biological community. This paragraph does not apply to aquatic pesticide or chemical discharges approved by the department and conducted by the department, the Department of Inland Fisheries and Wildlife or an agent of either agency for the purpose of restoring biological communities affected by an invasive species.

Sec. 6. 38 MRSA §465-A, sub-§1, śC, as amended by PL 1999, c. 243, §9, is repealed and the following enacted in its place:

C.__There may be no new direct discharge of pollutants into Class GPA waters.__The following are exempt from this provision:

(1)__Chemical discharges for the purpose of restoring water quality approved by the department;

(2)__Aquatic pesticide or chemical discharges approved by the department and conducted by the department, the Department of Inland Fisheries and Wildlife or an agent of either agency for the purpose of restoring biological communities affected by an invasive species; and