Procedure on acceptance of public improvements. When the developer has constructed and installed the on-site or off-site improvements and other improvements in accordance with Township regulations, standards and specifications, and desires the Township to accept said improvements, he shall, in writing by certified mail, return receipt requested addressed to the Township Clerk, with copies thereof to the Township Engineer, or Director of the Utility Department in the case of water and sewer improvements, request the Township Engineer or Director of the Utility Department to make a semifinal inspection of said improvements. If the improvements have been constructed under a performance guarantee or are subject to a maintenance guarantee, the developer shall submit an as-built plan showing as-built grades, profiles and sections and locations of all subsurface utilities, such as french drains, combination drains, sanitary sewage disposal systems both public and individual, waterlines and control valves, gas lines, telephone conduits, monuments, iron property markers and any other utility or improvements installed. Said as-built plan shall be certified to by a licensed New Jersey professional engineer. If any improvements are constructed prior to final plat approval, the final plat shall reflect all changes and as-built conditions and be so certified. If any improvements are constructed prior to final plat approval, the final plat shall reflect all changes and as-built conditions and be so certified. Said as-built plan(s) shall be submitted on Mylar sheets not exceeding twenty-four inches by thirty-six (24 x 36) inches. The as-built plan(s) shall be required for any improvements which partially release the performance, safety and stabilization or temporary certificate of occupancy guarantees.