After receiving approval from the Planning Board on a preliminary site plan, the applicant may prepare the final detailed site plan and submit it to the Planning Board for approval. If more than six months has elapsed between the time of the Planning Board's report on the preliminary site plan, and if the Planning Board finds that conditions have changed significantly in the interim, the Planning Board may require a resubmission of the preliminary site plan for further review and possible revision prior to accepting the proposed final site plan for review.