BANGOR, Maine — A Kennebunkport man was sentenced Wednesday in U.S. District Court to 18 months in federal prison for his role in a scheme to transport marijuana from Arizona to Maine in a recreational vehicle.

Mark Wolosko, 47, waived indictment in November and pleaded guilty to one count of conspiracy to possess with intent to distribute 100 kilograms or more of marijuana. One hundred kilograms equals 220 pounds.

In addition to prison time, U.S. District Judge John Woodcock sentenced Wolosko to two years of supervised release after he completes his prison term.

Wolosko has been held without bail since entering his guilty plea last year. That time will be credited to his sentence.

Gerald Rich Jr., 48, of Frankfort and Wolosko were arrested and released in July 2011 after they received 475 pounds of marijuana that was transported from Phoenix, Ariz., to Maine in a 31-foot 2004 Coachman Freedom. Rich owned the RV, according to court documents.

Rich has pleaded guilty to the same conspiracy charge Wolosko did. The Frankfort man is scheduled to be sentenced July 29 in federal court in Bangor.

Last month, James A. Sweeney, 28, of Gray pleaded guilty to being part of the conspiracy. His sentencing date has not been set. Sweeney is being held without bail.

The operation came to light on June 28, 2011, when a man, identified only by the initials C.S., was stopped for a traffic violation on Interstate 44 in southwest Missouri, according to court documents.

C.S. told agents from the U.S. Drug Enforcement Administration that Rich had flown June 10, 2011, from Portland, Maine, to Phoenix, Ariz. Rich gave C.S. $1,500 in cash to pay expenses on the return trip to Maine, according to the documents.

By pleading guilty, Rich and Wolosko admitted that they met the RV four days later in a Biddeford parking lot. Rich drove off in the RV and Wolosko drove C.S. home, according to court documents. Later that day, Rich paid C.S. $9,000 for making the trip.

C.S. flew back to Phoenix on June 26, 2011, and was stopped two days later in Missouri on his way to Maine in the Coachman Freedom RV owned by Rich, according to court documents. After he agreed to cooperate, two DEA agents joined C.S. for the remainder of the trip.

The RV arrived in Maine about 10 p.m. June 29, 2011, court documents said. C.S. met Wolosko, who was accompanied by a white female driving a car with a vanity plate that read “Wolosko,” in a Biddeford parking lot. C.S. got in the car and left with the woman while Wolosko drove the RV to 468 Loggin Road in Frankfort.

Wolosko and Rich were arrested in Frankfort during the early morning hours after 475 pounds of marijuana was found in the RV.

Information about the identity of C.S. had not been made public as of Thursday.