A Virginia man and his company, Industrial Training Support Services (ITSS), were recently sentenced for violating the Clean Air Act.
Some of the individuals who received false certificates were undocumented aliens who were issued certificates under false names.
Gonzalez also pleaded guilty to evading federal income taxes.
The court ordered Gonzalez to serve 27 months in prison, pay a $90,995 fine, pay $68,089 in restitution to the Internal Revenue Service and serve two years probation.
ITSS was ordered to jointly pay the $90,995 fine with Gonzalez and was placed on one year probation.
The case was investigated by EPA's Criminal Investigation Division.