The Board shall elect its chairman, and the Executive Director shall be appointed as set forth in § 2.2-106. The Executive Director shall serve as executive officer and devote his whole time to the performance of his duties, and he shall have such administrative powers as are conferred upon him by the Board; and, further, the Board may delegate to its Executive Director any of the powers and duties invested in it by this chapter except the adoption and promulgation of standards, rules and regulations; and the revocation of certificates. The Executive Director is authorized to issue, modify or revoke orders in cases of emergency as described in §§ 62.1-44.15 (8b) and 62.1-44.34:20 of this chapter. The Executive Director is further authorized to employ such consultants and full-time technical and clerical workers as are necessary and within the available funds to carry out the purposes of this chapter. It shall be the duty of the Executive Director to exercise general supervision and control over the quality and management of all state waters and to administer and enforce this chapter, and all certificates, standards, policies, rules, regulations, rulings and special orders promulgated by the Board. The Executive Director shall prepare, approve, and submit all requests for appropriations and be responsible for all expenditures pursuant to appropriations. The Executive Director shall be vested with all the authority of the Board when it is not in session, except for the Board’s authority to issue special orders pursuant to subdivisions (8a) and (8b) of § 62.1-44.15 and subject to such regulations as may be prescribed by the Board. In no event shall the Executive Director have the authority to adopt or promulgate any regulation.