PORTLAND — A Mexico man appeared in federal court Monday to face a charge of helping a Massachusetts street gang sell methamphetamine and fentanyl in western and southern Maine.

Adam Gill, 29, was arrested last week and charged with distribution and possession with intent to distribute controlled substances, a felony punishable by up to 20 years in prison and a fine of up to $1 million.

Gill continued to be held in federal custody when he appeared Monday in U.S. District Court wearing an orange jail suit, handcuffed and shackled.

He waived his right to challenge probable cause underlying the charge against him.

Assistant U.S. Attorney Noah Falk and defense attorney Grainne Dunne agreed to terms of Gill’s release on a $10,000 unsecured bond.

He must wait for a bed to become available at a so-called sober home or substance abuse recovery residence before he can be released from custody, U.S. Magistrate Judge Karen Frink Wolf told Gill Monday.

Gill will be supervised by a federal probation officer who will monitor whether he abides by his terms of release.

These include: no alcohol or narcotics, for which he can be tested; undergoing therapy and counseling for substance abuse; and no contact with any victims, witnesses or co-defendants in the case.

For months, the FBI had been investigating the incursion of the Trinitario street gang from Massachusetts into southern and western Maine, according to an affidavit signed by FBI Task Force Office Jonathan Duquette.

Gill had been involved in and assisting with the gang’s trafficking efforts, Duquette wrote.

The gang finds people addicted to the drugs they sell who have stable housing, then give them access to their drugs in exchange for use of their homes.

“The Trinitarios will then use the residence to traffic drugs to users and midlevel dealers in Maine for a period of time before moving on to the next similar residence,” Duquette wrote.

On March 29, an FBI confidential source bought for $1,300 two ounces of methamphetamine and 20 grams of fentanyl from Gill and a minor child who appeared to serve as his associate and has been charged separately, Duquette wrote.

The “CI” was given the cash in prerecorded bills and was equipped with audio and video transmitting equipment, Duquette wrote.

The “CI” drove to an address on Ridge Road in Peru, which had been arranged with Gill, and bought the drugs.

A U.S. Drug Enforcement Administration lab later confirmed that the drugs purchased by the “CI” were 19.8 grams of fentanyl and 48.1 grams of 75% pure methamphetamine, Duquette wrote.