(a) Whenever the Secretary of Forests and Waters or the Secretary of Mines and Mineral Industries shall be entitled by law to serve on a board, commission or other body, the Secretary of Environmental Resources shall serve in his place as if the Secretary of Environmental Resources had been designated to serve in the first instance.

(b) The Secretary of Environmental Resources shall serve in lieu of the Secretary of Health on the Ohio River Valley Water Sanitation Commission, created by the act of April 2, 1945 (P.L. 103), entitled “An act approving, ratifying and enacting into law the Ohio River Valley Sanitation Compact, for the prevention, abatement and control of pollution of the rivers, streams and waters in the Ohio River drainage basin, and making the State of Pennsylvania a party thereto; creating the ‘Ohio River Valley Water Sanitation Commission,’ providing for the members of such commission from the State of Pennsylvania; and providing for the carrying out of said compact after the conclusion of hostilities of the present war,”¹ and shall serve in lieu of a representative of the Sanitary Water Board on the Interstate Commission on the Potomac River Basin, created by the act of May 29, 1945 (P.L. 1134), entitled “An act to create a commission to act jointly with commissions appointed for like purpose by the States of West Virginia and Maryland, the Commonwealth of Virginia and the District of Columbia, which, together with three members to be appointed by the President of the United States, shall constitute the Interstate Commission on the Potomac River Basin, with power to cooperate in the abatement of existing pollution, and in control of future pollution of the waters of the drainage basin of the Potomac River within the States of Maryland and West Virginia, the Commonwealth of Virginia and the District of Columbia; to authorize the Governor of the State to execute on behalf of this State a compact with representatives of other states for the purpose of forming the above-mentioned commission; and creating a Potomac Valley Conservancy District; providing for the appointment of the Pennsylvania members of said commission for the Commonwealth of Pennsylvania, and their terms of office; and providing an appropriation.”²