Be it enacted by the Senate and House of Representatives in General Court assembled, and by the authority of the same, as follows:

Section 2 of chapter 750 of the acts of 1968 is hereby amended by striking out the last paragraph, added by section 2 of chapter 320 of the acts of 1970, and inserting in place thereof the following paragraph:-

The director of public works of the city of Lawrence shall be a member ex-officio and shall have full voting powers; the remaining members of the district commission appointed by the city of Lawrence shall be appointed by the mayor with the approval of the city council. Members appointed by the town of Andover shall be appointed by the town manager with the approval of the board of selectmen. Members from the towns of Methuen and North Andover shall be appointed by the board of selectmen.