Prior to any grading work or related activities, the owner must flag all property corners of the parcel of land to be graded. If the property corners are unknown, or whenever the location of a property line or easement or the title thereto is disputed during the application process or during a grading operation, a survey by a licensed land surveyor or civil engineer or other resolution of the title dispute, all at the expense of the applicant, may be required by the director. (Prior code § 9.34.1806)