El Grande also paid overtime-eligible employees straight time rates when they worked more than 40 hours per week, the agency said in its release.
Bookkeeping violations included failure to record cash payments made to workers, the department said.
"The outcome of this investigation serves as a reminder to all employers to review their pay practices to ensure employees are being paid for all the hours that they work," Wage and Hour Division District Director James Schmidt said in the release. "We remain committed to ensuring that employers who comply with the law do not find themselves at a competitive disadvantage to those who do not. We provide a wide variety of educational materials to help employers understand their responsibilities, and we staff offices nationwide to assist employers with compliance questions."