Chapter 1 — DATUM PLANE

7101. • DATUM PLANE.

Sea level is hereby declared to be the Datum Plane or base line of the City for the purpose of establishing and designating the official grades of the streets, alleys, avenues and sewers and for any other public work or improvement within the City and for measuring of elevations or surface points therein.

7102. • OFFICIAL BENCH MARK.

The official bench mark or datum monument within the City shall be the top of that certain iron pin driven flush with the surface of the cement sidewalk on the westerly side of First Avenue and south of St. Joseph Street, and the location of said bench mark or datum monument being as follows: Beginning at the southwest corner of the intersection of First Avenue and St. Joseph Street thence South along the westerly line of said First Avenue distant thereon .40 feet; thence East and parallel with the southerly line of said St. Joseph Street a distance of .10 feet, and its elevation is 493.323 feet above sea level or the City Datum Plane.