34 Pa. Code § 9.108
The contractors and subcontractors on the public work project shall post a notice or notices in the manner and form prescribed by § 9.103 (relating to required provisions). This notice is to be clearly legible and placed in a prominent and easily accessible place at the site of the public work project and at places used by them to pay workmen their wages.
This section cited in 34 Pa. Code § 9.104 (relating to duty of the public body).