20 CFR § 655.45 - Contact with bargaining representative, posting and other contact requirements.
(a) If there is a bargaining representative for any of the employer's employees in the occupation and area of intended employment, the employer must provide written notice of the job opportunity, by providing a copy of the Application for Temporary Employment Certification and the job order, and maintain documentation that it was sent to the bargaining representative(s). An employer governed by this paragraph (a) must include information in its recruitment report that confirms that the bargaining representative(s) was contacted and notified of the position openings and whether the organization referred qualified U.S. worker(s), including the number of referrals, or was non-responsive to the employer's requests.
(b) If there is no bargaining representative, the employer must post the availability of the job opportunity in at least 2 conspicuous locations at the place(s) of anticipated employment or in some other manner that provides reasonable notification to all employees in the job classification and area in which the work will be performed by the H-2B workers. Electronic posting, such as displaying the notice prominently on any internal or external Web site that is maintained by the employer and customarily used for notices to employees about terms and conditions of employment, is sufficient to meet this posting requirement as long as it otherwise meets the requirements of this section. The notice must meet the requirements under § 655.41 and be posted for at least 15 consecutive business days. The employer must maintain a copy of the posted notice and identify where and when it was posted in accordance with § 655.56.
(c) If appropriate to the occupation and area of intended employment, as indicated by the CO in the Notice of Acceptance, the employer must provide written notice of the job opportunity to a community-based organization, and maintain documentation that it was sent to any designated community-based organization. An employer governed by this paragraph (c) must include information in its recruitment report that confirms that the community-based organization was contacted and notified of the position openings and whether the organization referred qualified U.S. worker(s), including the number of referrals, or was non-responsive to the employer's requests.