PUBLIC LAWS-OH. 324 -JULY 25, 1947 Ante, p. 244. Interstate Commis- sion on Potomac River Basin. 33U.8.C.§567b. Ante, p. 244. 60 Stat. 806. 58 Stat. 528. 59 Stat. 290. 60 Stat. 519. Capital outlay, Refuse Division: For an additional amount for construction of proposed incinerator numbered 3 for refuse (at a total cost not to exceed $1,160,000), an additional amount for con- struction of proposed refuse transfer station (at a total cost not to exceed $706,000), and for beginning a garage and shops building (at a total cost not to exceed $731,000) in parcel 141/13, including $11,248 for construction services, $560,700; and the Commissioners are authorized in their discretion, if they deem it advantageous to the District of Columbia, to enter into a contract or contracts for the incinerator numbered 3 and the garage and shops building as a single project at a total cost not to exceed in the aggregate the limits of cost heretofore specified for both projects. Operating expenses, Sewer Division: For expenses necessary for operating the District's system of sewage disposal; cleaning and repair- ing sewers and basins; operation and maintenance of the sewage pumping service and sewage treatment plant, including repairs to equipment, machinery, and structures; maintenance of public con- venience stations; control and prevention of the spread of mosquitoes in the District of Columbia; and for contribution of the District of Columbia to the expenses of the Interstate Commission on the Potomac River Basin in accordance with Act of July 11, 1940 (54 Stat. 748), $5,400; $1,140,000. Capital outlay, Sewer Division: For construction of sewers and receiving basins; for assessment and permit work; for purchase or condemnation of rights-of-way for construction, maintenance, and repair of public sewers, $1,000; for increasing capacity of the Sew- age Treatment Plant, including additional sludge digestion tanks and additional sedimentation tanks, $1,370,000, to continue available until June 30, 1949; and for the preparation of surveys, plans and specifications in connection with the construction of storm-water sewers, $25,000; in all, $3,750,000, and in the preparation of such surveys, plans and specifications, and in increasing capacity of the Sewage Treatment Plant, temporary services as authorized by the Act of August 2, 1946, Public Law 600: Provided, That not to exceed $33,000 of the appropriation for "Capital outlay, Sewer Divi- sion", contained in the District of Columbia Appropriation Act, 1945, for the acquisition and development of a site for storage of construction materials; not to exceed $25,000 of the unexpended bal- ance of the appropriation for "Capital outlay, Sewer Division", for conducting a survey for city relief sewers, contained in the District of Columbia Appropriation Act, 1946; and not to exceed $44,825 of the appropriation for "Capital outlay, Sewer Division", contained in the District of Columbia Appropriation Act, 1947, for plans and specifications for chemical treatment, sludge drying and incineration facilities at the Sewage Treatment Plant, are continued available until June 30, 1948. Operating expenses, Water Division (payable from water fund): For expenses necessary for operation and maintenance of the District of Columbia water distribution system; installing and repairing water meters on services to private residences and business places as may not be required to install meters under existing regulations, said meters to remain the property of the District of Columbia; replace- ment of old mains, service pipes, and divide valves; water waste and leakage survey; such expenses to include purchase of passenger motor vehicles; and refunding of water rents and other water charges errone- ously paid in the District of Columbia, to be refunded in the manner prescribed by law for the refunding of erroneously paid taxes; $1,905,000, to be available for such refunds of payments made within the past two years. 444 [61 STAT.