PORTLAND — City voters on Nov. 3 will decide whether to establish a $15-per-hour minimum wage by Jan. 1, 2019.

City councilors on Sept. 9, meanwhile, will revisit the minimum wage ordinance they passed July 6, amended to specify how service employees will be paid. The July 6 minimum wage vote, which increased the current tipped wage to $6.35 per hour, was reconsidered on a motion by Councilor Jill Duson.

The actions came Monday during a 75-minute workshop and four-hour meeting, where councilors also approved a land purchase to expand the Department of Public Services operations on Canco Road, accepted the master plan for redeveloping Franklin Street, and refused the permit for a Cannabis Farmers Market Festival.

The decision on a November referendum came after a so-called livable wage citizen initiative, drafted and circulated by members of the Portland Green Independent Committee, drew 2,400 signatures.

“I think it speaks to the commitment to living wages in Portland. I think it speaks to the fact we are in a crisis,”Green committee Chairman and mayoral candidate Tom MacMillan said as he urged the City Council not to add a competing measure to the referendum question.

Councilors rejected a motion by Councilor Ed Suslovic, who is also running for mayor, to add a competing ballot question patterned largely on the July 6 ordinance. It boosts the citywide minimum wage to $10.10 per hour on Jan. 1, 2016, and $10.68 on Jan. 1, 2017.

The livable wage ordinance will likely be joined on the ballot by a zoning and land use citizen initiative designed to thwart development at the Portland Co. complex at 58 Fore St. Councilors set an Aug. 3 hearing date for the petition as part of Monday’s meeting.

In a workshop preceding the meeting, councilors, City Corporation Counsel Danielle West-Chuhta, and Bernstein Shur attorney Glenn Israel considered how to amend the city ordinance to reduce the economic impact on wages employers pay service workers earning $30 or more a month in tips.

The wage or tipped credit is set by state law at 50 percent of the state minimum wage of $7.50 per hour. The city ordinance had set a tipped wage at $6.35 per hour, based on subtracting the maximum state tipped credit from the new city wage.

“This whole thing is complicated at all three levels,” Israel said.

Councilors asked the attorneys to draft two different changes to the ordinance to peg the tipped wage at either 50 percent of the state or city minimum wage.