The standard design shall not apply to driveways, drains for driveways and lawns which have already been installed and constructed prior to the effective date of this chapter (Ordinance 594, passed September 28, 1960), but if any changes are made at the request of the owners of the property where the driveways and drains are installed, or if changes in driveways or drains for driveways are ordered by the Director of Public Service or Council, such changes shall be made according to the standard design and the specifications of the Director of Public Service.