The general assembly shall determine the amount necessary to be expended for the purposes of this part 8 and shall make annual appropriations as necessary from the general fund and from revenues made available under section 43-1-801 (1)(b). Moneys received or expended pursuant to the authorization contained in this part 8 shall be maintained in a separate fund. Said fund shall not be considered as part of either the state highway fund or the state highway supplementary fund. No part of this annual appropriation shall be utilized for hazardous wastes disposal studies.