; and of which such sums as become available in the Customs User Fee Account, except sums subject to section 13031(f)(3) of the Consolidated Omnibus Budget Reconciliation Act of 1985 ( 19 U.S.C. 58c(f)(3) ), shall be derived from that account: Provided , That not to exceed $34,425 shall be for official reception and representation expenses: Provided further , That not to exceed $150,000 shall be available for payment for rental space in connection with preclearance operations: Provided further , That not to exceed $1,000,000 shall be for awards of compensation to informants, to be accounted for solely under the certificate of the Secretary of Homeland Security. Procurement, construction, and improvements For necessary expenses of U.S. Customs and Border Protection for procurement, construction, and improvements, including procurements to buy marine vessels, aircraft, and unmanned aerial systems, $2,028,872,000, of which $193,326,000 shall remain available until September 30, 2021, and of which $1,835,546,000 shall remain available until September 30, 2023, of which, $1,600,000,000 shall be available for approximately 65 miles of pedestrian fencing along the southwest border in the Rio Grande Valley Sector: Provided , That the conditions set forth in subsections (b) and (c) of section 230 of division F of the Consolidated Appropriations Act, 2018 ( Public Law 115–141 ) shall apply during fiscal year 2019 to the amounts made available for pedestrain fencing in the clause preceding this proviso: Provided further , That not later than 180 days after the date of the enactment of this Act, the Secretary of Homeland Security shall submit to the Committee on Appropriations of the Senate, the Committee on Appropriations of the House of Representatives, and the Comptroller General of the United States an updated risk-based plan for improving security along the borders of the United States that includes the elements required under subsection (a) of section 231 of division F of the Consolidated Appropriations Act, 2018 (