Within sixty (60) days following completion of permanent repairs, the City Clerk shall determine actual costs of repairs, including cost of investigation, and prepare and furnish to such permittee(s) an itemized statement thereof and claim additional payment from, or make refund (without interest) to, the permittee(s), as the case may be. The permittee(s) shall be responsible for any damages by way of settlement or defect in the resurfacing for a period of one year following the completion of the work. (1988 Code § 7.08)