(Adopted 11/12/74; Revised 05/24/77)

          A.   Oral evidence shall be taken only on oath or affirmation.

          B.   Each party shall have these rights:

               1.   To call and examine witnesses;

               2.   To introduce exhibits;

               3.   To  cross-examine  opposing  witnesses  on  any  matter

                    relevant to the issues, even though that matter was not

                    covered in the direct examination;

               4.   To  impeach any witness regardless of which party first

                    called him to testify;

               5.   To rebut the evidence against him.

          C.   If respondent  does not testify in his own behalf, he may be

               called and examined as if under cross-examination.

          D.   The hearing need  not  be  conducted  according to technical

               rules  relating  to  evidence and witnesses.   Any  relevant

               evidence shall be admitted  if it is the sort of evidence on

               which responsible persons are  accustomed  to  rely  in  the

               conduct of such serious affairs, regardless of the existence

               of  any  common  law  or  statutory  rule  which  might make

               improper  the  admission of such evidence over objection  in

               civil actions.  Hearsay evidence may be used for the purpose

               of supplementing or explaining any direct evidence but shall

               not be sufficient  in  itself to support a finding unless it

               would be admissible over  objection  in  civil actions.  The

               rules of privilege shall be effective to the  same that they

               are now or hereafter may be recognized in civil actions, and

               irrelevant   and   unduly  repetitious  evidence  shall   be


          E.   All evidence, oral or  written,  and  all  exhibits shall be

               recorded at the time of the hearing and all records shall be

               maintained for a period of time as specified  by  law  or as

               determined by the Air Pollution Control Board.