The former CEO of a New Jersey-based engineering consulting company has been sentenced for a scheme in which the U.S. government was overbilled for reconstruction projects for nearly 20 years.

Derish Wolff will serve 12 months of home confinement and will be required to pay a $4.5 million fine.

The 79-year-old Bernardsville resident worked for Morristown-based Louis Berger Group.

Federal prosecutors contend the company padded work hours to make it appear employees had spent time on the government contracts when they actually had not.

Some of the work involved reconstruction projects in Iraq and Afghanistan for the United States Agency for International Development, a federal agency that advances U.S. foreign policy in developing countries and countries destabilized by war.

Prosecutors say the conspiracy started in 1990 and ended in 2007.