Section 5. Apportionment of Portworks Special Fund.—The following sums or so much thereof as may be necessary are hereby apportioned out of the construction portion of the Portworks Special Fund that have accrued tinder Act No. 3592, as amended by Commonwealth Act No. 130 and by Republic Act No. 1216, not otherwise apportioned, to be released by the Secretary of Public Works and Communications pursuant to the provisions hereinafter set forth and for the purposes mentioned hereunder: