(a) If it appears that controversy exists with respect to compliance with a Board order which cannot be resolved without a formal proceeding, the Regional Director may issue and serve on all parties a compliance specification in the name of the Board. The specification will contain or be accompanied by a Notice of Hearing before an Administrative Law Judge at a specific place and at a time not less than 21 days after the service of the specification. (b) Whenever the Regional Director deems it necessary