(1) Vertical Requirements. The vertical datum on all engineering plans, plats, binding site plans and short plats shall be the North American Vertical Datum of 1988 and shall be tied to at least one King County or City of Covington survey control network benchmark. The benchmark will be shown on the plans. If a County or City survey control network benchmark does not exist within one-half mile of the subject property, or 250 feet or greater of total vertical difference exists between the starting benchmark and the project, an alternate vertical datum may be used.

(2) Horizontal Requirements. The horizontal component of all subdivisions, binding site plans and short subdivisions shall have the North American Datum of 1983/91 as its coordinate base and basis for bearings. All horizontal control for these projects shall be referenced to a minimum of two King County or City of Covington survey horizontal control monuments. If two horizontal control monuments do not exist within one mile of these projects, an alternate coordinate base and basis of bearings may be used. (Ord. 13-19 § 5; Ord. 53-02 § 2 (19A.08.130))