(a) The footage of walks and driveways to be paid for shall be the actual number of square feet of walk or driveways of the specified thickness, in place, and the removal or replacement of curb shall be paid for by the actual number of lineal feet, completed and accepted, and shall be paid for at the contract unit price bid.
(b) Such payments shall constitute full compensation for necessary excavation and back fill, the removal and disposal of all excess excavation, furnishing, preparing and placing all material, including expansion joints, reinforcing steel and subgrade material and for all labor, equipment, tools and incidentals necessary to complete these items.
(c) Payments shall be made based on the monthly estimate of the Commissioner after final inspection and checking of the work, according to the certificates of the Commissioner.
(d) Such certificates will be based on the amount of work satisfactorily completed the previous calendar month, and will amount to ninety percent of the value of completed work.
(e) Final payment will be made immediately after the Commissioner has certified that all work required hereunder is fully constructed or reconstructed in accordance with the contract documents and after the contractor has furnished a satisfactory bond guaranteeing the payment of all bills for labor or material incurred in the prosecution of the work, or satisfactory evidence that all such bills have been paid.
(f) Final payment shall be the value of the material furnished and labor performed under the contract, at prices named in the proposal of the contractor, less the total amount of all previous estimates, and according to the certificate of the Commissioner.
(1952 Code § 7-4-39)