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(b~) After all street improvements have been completed, the center lines of all shall be accurately re-established cording to the bearings and distances shown on the plans. The intersections of all street center lines shall be marked with a P. K. Nail. P. K. Nails shall also mark the begin- ning and end of all curves. Where the point of intersection of the semi-tangents to a curve falls in pavement, this point also shall be marked with a P. K. Nail. Should the P. I. fall on side- walk or curb, the point shall be marked with a cross chiselled in the concrete. Should the P. I. face on natural ground in an avail- able spot, it shall be marked by an iron pipe with the Engineer's Registration tab attached. The top of the pipe shall be one foot below the surface of the ground. Should any center line point herein required to be marked, fall upon a manhole or other surface obstruction, four straddle points shall be set, using P. K. nails, 24 inches each direction from the true point, so that lines drawn across twoopposite points will be at approximately righ~ angles to each other. (¢7 Any monument or bench-mark, as required by this Ordi- nance, that is disturbed or destroyed before acceptance of all im- provements shall be replaced by the subdivider. (4) Monuments and bench-marks shall be set before submission of the final map for City Council approval unless exception is re- commended by the City Engineer and approved by the City Council. "SECTION 9366. Survey and Map Data, General. "The final map shall show all survey and mathematical information and data necessary to locate all monuments and to locate and re- trace any and all interior and exterior boundary lines appearing thereon, including bearings and distances of straight lines, and radii and arc lengths for all curves, and such information as may be necessary to determine the location of the centers of curves. The final map shall particularly define, delineate and designate, all -24-