The form of the final map shall comply with the Map Act and as follows:
1. The final map shall be legibly drawn, printed, or reproduced by a process guaranteeing a permanent record in black on polyester base film. Certificates, affidavits and acknowledgments may be legibly stamped or printed upon the map with opaque indelible ink. If ink is used on polyester base film, the ink surface shall be coated with a suitable substance to assure permanent legibility.
2. The size of each sheet shall be 18 inches by 26 inches. A marginal line shall be drawn completely around each sheet, leaving an entirely blank margin of 1 inch. The scale of the map shall be an engineering scale and not less than 1 = 100 or as may be necessary to show all details clearly, and enough sheets shall be used to accomplish this end. The particular number of the sheet and the total number of sheets comprising the map shall be stated on each of the sheets, and its relation to each adjoining sheet shall be clearly shown. When four or more sheets including the certificate sheet are used, a key sheet shall be included. All printing or lettering on the map shall be of 1/8 inch minimum height and of a shape and weight as to be readily legible on prints and other reproductions made from the original drawings. The final form of the final map shall be in compliance with Map Section 66434 and as approved by the City Engineer.