Use of Contractors (a) If the employer wishes to engage contractors and their employees to perform work in the classifications covered by this agreement, the employer must first consult in good faith with the union. Consultation will occur prior to the engagement of sub-contractors. (b) If the employer decides to engage subcontractors, the employer shall ensure that these contractors and their employees receive wages, allowances and conditions equal to or better than those contained in this agreement. (c) The use of sham sub contracting arrangements is a breach of this agreement. The contractor who engages subcontractors is responsible for ensuring the employees of sub- contractors receive wages, allowances and conditions equal to or better those contained in this agreement, this obligation extends to liability for all outstanding wages conditions and entitlements under this agreement.