20 CFR § 655.444 - Notice of posting requirement.
The employer must post a copy of the CW-1 Application for Temporary Employment Certification in at least two conspicuous locations at the place(s) of 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 CW-1 workers. Electronic posting, such as displaying an electronic copy of the CW-1 Application for Temporary Employment Certification prominently on any internal or external website 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 be posted for a period of 21 consecutive calendar days. The employer must maintain proof the CW-1 Application for Temporary Employment Certification was posted and identify where and during what period of time it was posted in accordance with § 655.456.