[Code of Federal Regulations] [Title 40, Volume 24] [Revised as of July 1, 2008] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR247.4] [Page 381] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 247_COMPREHENSIVE PROCUREMENT GUIDELINE FOR PRODUCTS CONTAINING RECOVERED Subpart A_General Sec. 247.4 Contracting officer requirements. Within one year after the effective date of each item designation, contracting officers shall require that vendors: (a) Certify that the percentage of recovered materials to be used in the performance of the contract will be at least the amount required by applicable specifications or other contractual requirements, and (b) Estimate the percentage of total material utilized for the performance of the contract which is recovered materials.