The clinics served a total of 1,200 to 1,500 patients.
He said the clinic, which is to open in August, may serve 1,000 to 1,500 people.
The clinic has served 300 clients since it began two years ago.
For 2011, the clinics served 34,000 patients and had revenues of $27 million.
Some clinics serve individuals whose income is below a certain level and who need to resolve a tax problem.
The clinic serves adults at the same price on weekends.
Two clinics did not use the guidelines and served as controls.
The costs limit the number the clinics may serve, and many now turn addicts away.
Those needing health care can save time by finding out in advance what clinic will best serve their needs.
The other four clinics served as a control group.