When a person shall be convicted of an offense under the laws of the city and shall be adjudged to pay a fine and costs, and shall fail to pay the fine and costs, the municipal judge may collect the fine by sentencing such person so fined to labor on the streets or on other public works, one day for each $10.00 of such fine unpaid. Persons fined and sentenced to labor, as set out in this section, shall be under the charge and supervision of the public works department. (Ord. 210 § 141, 1977).