Any work in the right-of-way requires a permit, except for surface landscaping, tree planting, and irrigation systems. Any undisturbed soil must be stabilized to control erosion within 24 hours. Retaining walls require a permit if constructed in the right-of-way. Replacement of driveways to the existing width does not require a permit. If a driveway is widened without any change in the street or curbing a permit is not required. A permit is required if the street and/or curbing is proposed to be modified.