The exemption provided in this paragraph shall apply only to the land area and the scope of the major Highlands development addressed by the qualifying approvals pursuant to subparagraphs (a) and (b), or (c) if applicable, of this paragraph, shall expire if any of those qualifying approvals expire, and shall expire if construction beyond site preparation does not commence within three years after the date of enactment of this act;
N.J.S. § 13:20-28