CHAPTER 664

S.P. 743 - L.D. 1899

An Act To Amend the Dissolved Oxygen Standard for Class C

Waters

Be it enacted by the People of the State of Maine as follows:

Sec. 1. 38 MRSA §465, sub-§4, ¶B, as affected by PL 1989, c. 890, Pt. A, §40 and amended by Pt. B, §63, is further amended to read:

B. The dissolved oxygen content of Class C water may be not 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. In addition, in order to provide additional protection for growth of indigenous fish, dischargers that were issued final discharge licenses or water quality certificates prior to March 16, 2004 that are based on a 6.5 parts per million dissolved oxygen criterion must continue to be licensed using a temperature of 24 degrees centigrade or the ambient temperature of the water body, whichever is lower.__Final discharge licenses and water quality certificates not based on a 6.5 parts per million dissolved oxygen criterion prior to March 16, 2004 must be based on a 6.5 parts per million dissolved oxygen criterion at a temperature of 22 degrees centigrade or the ambient temperature of the water body, whichever is lower. Between May 15th and September 30th, the number of Escherichia coli