If the sketch plat is considered for classification as a minor subdivision, the Board shall act on the proposed plat within 45 days of its complete and proper submission to the Secretary or within such further time as may be consented to by the applicant. Failure of the Planning Board to act within the prescribed time period shall constitute minor subdivision approval. If classified as a minor subdivision by majority action of the Board, a notation to that effect, including the date of classification, shall be made on the master copy. All prints of the plat shall be signed by the Chairman and Secretary of the Board (or the acting Chairman or Secretary where either or both may be absent) and returned to the subdivider within one week thereof. No further approval of the subdivision shall be required. In the event the same is disapproved by the Board, the Secretary of the Board shall, within three days of such action, notify the subdivider of such disapproval and reasons therefor. In acting on the application, the Borough shall consider a report received, in writing, from the County Planning Board within 30 days after their receipt of the plat. If a reply is not received from the County Planning Board within 30 days, the sketch plat shall be deemed to have been approved by them.