PUBLIC LAWS-CH. 354- -JULY 20,1949 49 Stat. 660. 60 Stat. 810. Leasing of private property. Ante, p. 403. 62 Stat. 983. 28 U. . 0., Supp. I, § 2672. Ante, pp. 62,106. 49 Stat. 906. 48 Stat. 1621. 49 Stat. 660, 961, 1463; 55 Stat. 338. 59 Stat. 1219. Lower Rio Orande flood-control project. 59 Stat. 89. International Boundary and Water Commission. between the United States and Mexico, and to comply with the Act approved August 19, 1935, as amended (2'2 U. S. C. 277-277d), includ- ing operation and maintenance of the Rio Grande rectification, canali- zation, flood control, bank protection, boundary fence, and sanitation projects; examinations, preliminary surveys, and investigations; detailed plan preparation and construction (including surveys and operation and maintenance and protection during construction); and Rio Grande emergency flood protection; construction and operation of gaging stations; purchase and exchange of map-reproduction machines and other equipment and machinery; personal services in the District of Columbia; services in accordance with section 15 of the Act of August 2, 1946 (5 U. S . C . 55a), at rates for individuals not in excess of $100 per diem; travel expenses, including, in the discretion of the Commissioner, expenses (not to exceed $500) of attendance at meetings of organizations concerned with the activities of the International Boundary and Water Commission which may be necessary for the efficient discharge of the responsibilities of the Com- mission; printing and binding; purchase of (ten for replacement only) passenger motor vehicles; hire, with or without personal services, of work animals, and animal-drawn and motor-propelled vehicles and aircraft and equipment; acquisition by donation, purchase, or con- demnation, of real and personal property including expenses of abstracts and certificates of title; purchase of ice and drinking water; inspection of equipment, supplies, and materials by contract; drilling and testing of foundations and dam sites, by contract if deemed neces- sary, purchase of planographs and lithographs, and leasing of private property to remove therefrom sand, gravel, stone, and other materials, without regard to section 3709 of the Revised Statutes, as amended (41 U. S . C . 5); payment of claims pursuant to section 403 of the Federal Tort Claims Act (28 U. S . C . 2672), and the Act of August 27, 1935, as amended (22 U. S. C. 277e); and payment of official tele- phone service in the field in case of official telephones installed in private houses when authorized under regulations established by the Commissioner; as follows: SALARIES AND EXPENSES For salaries and expenses, regular boundary activities, including examinations, preliminary surveys, and investigations, $1,120,000. CONSTRUCTION For detail plan preparation and construction of projects authorized by the Convention concluded February 1, 1933, between the United States and Mexico, the Acts approved August 19, 1935, as amended (22 U. S . C . 277-277d), August 29, 1935 (Public Law 392), June 4, 1936 (Public Law 648), June 28, 1941 (22 U. S . C . 277f), and the projects stipulated in the treaty between the United States and Mexico signed at Washington on February 3, 1944, $900,000, to be immediately available, and to remain available until expended: Provided,That no expenditures shall be made for the lower Rio Grande flood-control project for construction on any land, site, or easement in connection with this project except such as has been acquired by donation and the title thereto has been approved by the Attorney General of the United States: Providedfurther,That expenditures for the Rio Grande bank-protection project shall be subject to the provisions and condi- tions contained in the appropriation for said project as provided by the Act approved April 25, 1945 (Public Law 40): Providedfurther, That unexpended balances of appropriations for construction under the International Boundary and Water Commission available for the 452 [63 STAT.