PUBLIC LAWS--CH. 184-JULY 1, 1943 Library building, construction. 53 Stat. 1011. 6 Stat. 431 . 56 Stat. 431 . Mosquito control. Interstate Commis- sion on the Potomac River Basin. 54 Stat. 748. 33U.S. . 567b. Not to exceed $7,000 of the unexpended balances of the amounts made available by the District of Columbia Appropriation Act, 1940, for the preparation of plans and specifications for the new central building of the Public Library of the District of Columbia shall remain available for the same purposes and under the same condi- tions and limitations until June 30, 1944. SEWERS For personal services, including one chief engineering inspector at $2,600 per annum, without reference to civil-service requirements, $175,273. For cleaning and repairing sewers and basins, including the pur- chase, exchange, operation, and maintenance of non-passenger-carry- ing motor vehicles used in this work; and for operation and mainte- nance of the sewage pumping service, including repairs to equipment, machinery, and pumping stations, and employment of mechanics and laborers, purchase of electricity, fuel, oil, waste, and other supplies, $243,820. For construction of sewers and receiving basins, $393,750, together with not to exceed $250,000 of the unexpended balance of the appro- priation of $630,000 for this purpose contained in the District of Columbia Appropriation Act of 1943, including the purchase, exchange, operation, and maintenance of non-passenger-carrying motor vehicles used in this work. For assessment and permit work, sewers, including not to exceed $1,000 for purchase or condemnation of rights-of-way for construction, maintenance, and repair of public sewers, $100,000, together with not to exceed $300,000 of the unexpended balance of the appropria- tion of $500,000 for this purpose contained in the District of Colum- bia Appropriation Act, 1943. For the control and prevention of the spread of mosquitoes in the District of Columbia, including personal services, operation, main- tenance, and repair of motor-propelled vehicles, purchase of oil, and other necessary expenses, $4,800. Sewage treatment plant: For operation and maintenance, includ- ing salaries and wages of necessary employees, supplies, repairs to buildings and equipment, purchase of electric power, fuel, oil, waste, and other necessary expenses, including the maintenance of non- passenger-carrying motor vehicles used in this work, $202,157. For the pro rata contribution of the District of Columbia to the expenses of the Interstate Commission on the Potomac River Basin, in accordance with Public Resolution Numbered 93, approved July 11. 1940, granting such Commission authority to regulate, control, prevent, or otherwise render unobjectionable and harmless the pollu- tion of the water of the Potomac drainage area by sewage and industrial and other wastes, $3,600. COLLECTION AND DISPOSAL OF REFUSE For personal services, $146,610. For dust prevention, sweeping and cleaning streets, avenues, alleys, and suburban streets, under the immediate direction of the Commis- sioners, including services and purchase and maintenance of equip- ment, rent of storage rooms; maintenance and repair of garages; maintenance and repair of non-passenger-carrying motor-propelled vehicles necessary in cleaning streets, purchase of and purchase including exchange of motor-propelled street-cleaning equipment; and necessary incidental expenses, $713,900. [57 STAT. 320
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