Four people, including a family of three, have been arrested in a year-long TTC internal fraud investigation, police say.

In July 2009, allegations of fraud were made against a TTC project manager and the owner of a paving company hired by the TTC.

A year later, Toronto police were brought in to help the TTC investigate the complaints.

Sebastien Corbo, owner of IPAC Paving Limited, was reportedly hired by the TTC to do some contract work.

Corbo is accused of over-charging the TTC for contract work. According to police, the TTC lost $149,020 in the transaction.

The 51-year-old from Toronto faces four charges including fraud over $5,000 and possession of property obtained by crime.

The TTC project manager that oversaw the transaction has also been charged.

Bruno Colavecchia, a 49-year-old from Maple, was in charge of paving and construction work at TTC sites at the time.

His duties allegedly included sending invoices to Corbo's company and setting up contract work payment. He faces five charges, including laundering proceeds of crime.

Colavecchia's wife and son have also been arrested in connection with the fraud.

Bruno Colavecchia, his wife Vincenza Grossi and their son Michael Colavecchia have been accused of creating bank accounts and receiving money directly from Corbo's paving company.

Vincenza and Michael face three charges each, including laundering proceeds of crime and conspiracy to commit indictable offence.

All four suspects are scheduled to appear in court at 1000 Finch Avenue West on July 28 at 1 p.m.

Anyone with information is encouraged to contact police at 416-808-3207, Crime Stoppers anonymously at 416-222-TIPS (8477) or online at www.222tips.com.