My company has no policy or procedures manual. Nothing is documented conerning Holiday pay, what can be done to ensure I get paid for working Holiday

Payment for overtime is covered by the Fair Labor Standards Act and, in addition, may also be covered by state law. States are allowed to pass laws that regulate employee compensation as long as the laws they pass are at least as beneficial to the employee as the federal law, or more beneficial to the employee than the federal law. So the federal law is the "floor" below which the the employer cannot pay the employee.  Federal law requires that employees be paid for all time that they actually work. It does not require that an employee be compensated for any time when the employee is not actually working. If you work a holiday, federal law only requires that you be paid your regular rate for teh hours you worked. If you actually work more than 40 hours in that work week, federal law requires your employer to pay you 1.5 x your regular hourly rate. Your note makes it appear that your employer is not paying you for 4 hours that you actually worked. If this is the case, the employer is breaking the law. You can sue your employer under the FLSA in state or federal court. If you win you will get double the amount he refused to pay you, plus reimbursement for your attorneys fees. I am not aware of Colorado's wage and hour laws, so I cannot address the question under that law..