Harb. & Nav. Code, § 5903

If the purposes for which the bonds were voted are being or shall be carried out by cooperation or agreement between the United States of America or any department, officer or agency thereof, and the district, the proceeds of the bonds may be turned over to the United States of America, or any department, officer or agency thereof, to be expended by it in the performance of the improvement or development work for which the bonds were voted.

If the improvement or development work for which the bonds of the district were voted is to be done jointly with the United States of America, or any department, officer or agency thereof, the portion of the cost to be borne by the district may be turned over to the United States of America, or any department, officer or agency thereof, to be expended by it in the performance of the improvement or development work, and all cooperative arrangements or agreements heretofore entered into are hereby validated, legalized and confirmed, and the payment and turning over to the United States of America or to any department, officer or agency thereof, heretofore or hereafter of the proceeds of any harbor district bonds for expenditure by the United States of America, or any department, officer or agency thereof, in the performance of the improvement or development work for which the bonds were voted is hereby validated, legalized and confirmed for all purposes and the performance of the work by or under the supervision of the United States of America, or any department, officer or agency thereof, is hereby validated, legalized and confirmed.