After approval, the Secretary of the Planning Board shall deliver the signed copy of the plat to the applicant. The final plat, after approval, shall be filed within 90 days from the date of such approval. If any final plat is not filed within this ninety-day period, the approval shall be deemed null and void. No plat shall be accepted for filing by the County Clerk unless it has been duly approved by the Township Planning Board and signed by the Chairman and Secretary of the Planning Board. Copies of the approved plat shall be forwarded with the usual transmittal form to the land use official (Mylar if applicable), Construction Official, Township Clerk, Township Engineer (Mylar if applicable), Municipal Tax Assessor, Board files (Mylar if applicable) and the applicant (Mylar if applicable) and such other municipal, county or state agencies or officials as directed by the Board, transportation supervisor of affected schools, Township Police Department, Township Fire Department, Township Rescue Squad, branch of United States Post Office, and the County Planning Board. A copy of the application form with the approval noted thereon shall be delivered to the applicant. The performance guarantee shall be delivered and retained by the Township Clerk. A statement by the Engineer with respect to the location of public utilities and with respect to the amount of the performance shall be delivered to and retained by the Township Clerk. A statement by the Engineer with respect to the location of public utilities and with respect to the amount of the performance guarantee to be required shall be retained by the Secretary of the Planning Board. Upon request of the Secretary of the Planning Board, and upon other such times as the Engineer shall deem necessary, the Engineer shall make field inspections of the work done pursuant to the subdivision in order to assure that the requirements and conditions of the subdivision approval are being met. The Planning Board and the Township Committee shall be kept advised with respect thereto.