(1) Index. The board has available to all persons a current index which provides identifying information as to the following records issued, adopted or promulgated since June 30, 1972.

"(a) Final opinions, including concurring and dissenting opinions, as well as orders, made in the adjudication of cases;

"(b) Those statements of policy and interpretations of policy, statute and the Constitution which have been adopted by the agency;

"(c) Administrative staff manuals and instructions to staff that affect a member of the public;

"(d) Planning policies and goals, and interim and final planning decisions;

"(e) Factual staff reports and studies, factual consultant's reports and studies, scientific reports and studies, and any other factual information derived from tests, studies, reports or surveys, whether conducted by public employees or others; and

"(f) Correspondence, and materials referred to therein, by and with the agency relating to any regulatory, supervisory or enforcement responsibilities of the agency, whereby the agency determines, or opines upon, or is asked to determine or opine upon, the rights of the state, the public, a subdivision of state government, or of any private party."

(2) Availability. The current index promulgated by the board shall be available to all persons under the same rules and on the same conditions as are applied to public records available for inspection.