(1) The board, with the approval of the Governor, is hereby authorized to enter on behalf of the state into an agreement with the Secretary of Health, Education and Welfare, consistent with the terms and provisions of this article, for the purpose of extending the benefits of the federal old-age and survivors insurance system to employees of the state or any instrumentality of any one or more of the foregoing, with respect to services specified in such agreement which constitute “employment” as defined in Section 25-11-5 of this article. Such agreement may contain such provisions as the board and the Secretary of Health, Education and Welfare shall agree upon, but except as may be otherwise required by or under applicable federal law as to the services to be covered, such agreement shall provide in effect that:

(a) Benefits will be provided for employees whose services are covered by the agreement (and their dependents and survivors) on the same basis as though such services constituted employment within the meaning of Title II of the Social Security Act;

(b) The state will pay to the Secretary of the Treasury at such time or times as may be prescribed by the applicable federal law or by regulation promulgated thereunder, contributions with respect to wages (as defined in Section 25-11-5 of this article) equal to the sum of the taxes which would be imposed by the Federal Insurance Contributions Act if the services covered by the agreement constituted employment within the meaning of that act;

(c) Such modification shall be effective with respect to services in employment covered by the agreement performed after a date specified therein provided such date is not inconsistent with the applicable provision of the federal law;

(d) All services which constitute employment as defined in Section 25-11-5 and are performed in the employ of the state by employees of the state shall be covered by the agreement; and

(e) All services which (i) constitute employment as defined in Section 25-11-5, (ii) are performed in the employ of a political subdivision or in the employ of an instrumentality of either the state or a political subdivision, or both, and (iii) are covered by a plan which is in conformity with the terms of the agreement and which has been approved by the board under Section 25-11-11 shall be covered by the agreement.

(f) As modified, the agreement shall include all services described in either paragraph (d) or paragraph (e) of this subsection and performed by individuals to whom Section 218(C)(3)(C) of the Social Security Act is applicable, and shall provide that the service of any such individual shall continue to be covered by the agreement in case he thereafter becomes eligible to be a member of a retirement system; and

(g) As modified, the agreement shall include all services described in either paragraph (d) or paragraph (e) of this subsection and performed by individuals in positions covered by a retirement system with respect to which the Governor has issued a certificate to the Secretary of Health, Education and Welfare pursuant to Section 25-11-11(8) of this article.

(2) Any instrumentality jointly created by this state and any other state or states is hereby authorized, to the extent that this state may confer authority, upon the granting of like authority by such other state or states, (i) to enter into an agreement with the Secretary of Health, Education and Welfare whereby the benefits of the federal old-age and survivors insurance system shall be extended to employees of such instrumentality, (ii) to require its employees to pay (and for that purpose to deduct from their wages) contributions equal to the amounts which they would be required to pay under Section 25-11-9(1) if they were covered by an agreement made pursuant to subsection (1) of this section, and (iii) to make payments to the secretary of the treasury in accordance with such agreement, including payment from its own funds, and otherwise to comply with such agreement. Such agreement shall, to the extent practicable, be consistent with the terms and provisions of subsection (1) hereof and other provisions of this article.