Sec. 1. 38 MRSA §465, sub-§3, ¶B, as enacted by PL 1985, c. 698, §15, is amended to read:

B. The dissolved oxygen content of Class B waters shall be may not be less than 7 parts per million or 75% of saturation, whichever is higher, except that for the period from October 1st to May 14th, in order to ensure spawning and egg incubation of indigenous fish species, the 7-day mean dissolved oxygen concentration shall may not be less than 9.5 parts per million and the 1-day minimum dissolved oxygen concentration shall may not be less than 8.0 parts per million in identified fish spawning areas. Between May 15th and September 30th, the number of Escherichia coli bacteria of human and domestic animal origin in these waters may not exceed a geometric mean of 64 per 100 milliliters or an instantaneous level of 427 236 per 100 milliliters.

Sec. 2. 38 MRSA §465, sub-§4, ¶B, as amended by PL 1989, c. 890, Pt. B, §63 and affected by Pt. A, §40, is further amended to read:

B. The dissolved oxygen content of Class C water may be not be less than 5 parts per million or 60% of saturation, whichever is higher, except that in identified salmonid spawning areas where water quality is sufficient to ensure spawning, egg incubation and survival of early life stages, that water quality sufficient for these purposes must be maintained. Between May 15th and September 30th, the number of Escherichia coli bacteria of human and domestic animal origin in these waters may not exceed a geometric mean of 142 126 per 100 milliliters or an instantaneous level of 949 236 per 100 milliliters. The board shall promulgate adopt rules governing the procedure for designation of spawning areas. Those rules must include provision for periodic review of designated spawning areas and consultation with affected persons prior to designation of a stretch of water as a spawning area.

Sec. 3. 38 MRSA §465-B, sub-§2, ¶B, as enacted by PL 1985, c. 698, §15, is amended to read:

B. The dissolved oxygen content of Class SB waters shall be may not be less than 85% of saturation 6.5 parts per million as a one-day average and not less than 6.0 parts per million at any time. Between May 15th and September 30th, the numbers of enterococcus bacteria of human and domestic animal origin in these waters may not exceed a geometric mean of 8 per 100 milliliters or an instantaneous level of