§ 486. Maintenance of records. In connection with each contract, the commissioner and the municipality shall keep adequate records of the amount of the payment by the state, the amount of federal assistance, if any, received by the municipality for the project, and of all moneys expended by the municipality for such project. Such records required to be kept by the commissioner shall establish the basis for recalculations of the state financial assistance as required herein. The commissioner shall have authority to carry out, or to cause to be carried out, audits of such contracts and records pursuant to rules and regulations promulgated by the commissioner.