Corona Municipal Code Ch. 12.04 Datum Plan

All grades for streets within the city shall be referred to and established from a common reference or datum plane, whose grade shall be defined as zero, and above which all elevations shall be given in feet and decimals of a foot.

(`78 Code, § 12.04.010.)

The datum plane provided for in § 12.04.010 shall be defined to be a horizontal plane lying 171.2 feet below the top of a certain metal bolt set in the foundation of the cement sidewalk at the northwesterly corner of Main and Sixth Streets. The metal bolt is situated on the southeasterly corner of Lot 1, Block 144. The top of the bolt is about one-half inch below the surface of the cement sidewalk.

(`78 Code, § 12.04.020.)

"Official grade" means the grade or curblines. Grades shall be established at street intersections and at such points between as may be desirable, and grade lines shall be unbroken lines between adjacent established points. Elevations for grades shall be taken at the four corners of each street intersection (and at such other points, if any, as the City Engineer may seem desirable). The points at which such elevations shall be taken shall be defined to be the points of intersection of the curblines of the street upon which the grade is proposed to be established, with the property lines extended, of cross streets.

(`78 Code, § 12.04.030.)

All street work, plans, profiles and cross sections shall be prepared by the City Engineer, approved and adopted by the Council and filed in the office of the City Engineer before the passage of any resolution of intention to improve any street or portion thereof. The height of curbs and the height and curve of the street crown shall be such as shall be shown on the cross section so adopted and filed as specified in this section. At street intersections, curbs shall be carried around the corners on a level until opposite the property line in either direction; provided, that in cases where the natural contour of the land is such as to require, curb corners may be established on such grades as may be necessary, and in such cases the grade of curb corners shall be clearly shown by the plans and profiles for the same adopted and filed as set forth in this section.

(`78 Code, § 12.04.040.)