Whenever review or approval of the application by the County Planning Board is required by Section 5 of P.L. 1968, C.285, in the case of a subdivision, or Section 8 of P.L. 1968, C.285, in the case of a site plan, the Board of Adjustment shall condition any approval that it grants upon timely receipt of a favorable report on the application by the County Planning Board or by failure to report thereupon within the required time.