Fairfax County police have arrested five persons in what they said was a crackdown on two separate gambling operations involving football betting cards.

The arrests Saturday and Monday climaxed a three-month investigation by undercover detectives, according to county police Lt. Roco Ricci. He said the betting cards listed college and professional games.

Arrested Saturday at a Mobil gas station at Graham Road and Arlington Boulevard were Leonard R. Weeks, 38, of Manassas and Richard T. Johnson, 29, of 4931 Manitoba Dr., Alexandria. Weeks was charged with five months of conducting an illegal gambling operation and one of possessing a gambling device. Johnson, manager of the gas station, was charged with 12 counts of conducting an illegal gambling operation, one of distributing marijuana and one of possessing a gambling device.

Arrested Monday in connection with what police said was a separate operation were Helen B. Maute, 50 and Perry A. Henson, 38, both of 3606 Barcroft Ter., Falls Church, and Robert W. Smith, 27 , of 5510 N. Morgan St., Alexandria.

Maute was charged with nine counts of operating an illegal gambling operation, and Smith with five counts of operating an illegal gambling operation and three of assisting one.

All the suspects were released on bond.