This interim final rule implements provisions of the American Recovery and Reinvestment Act of 2009 that pertain to the Surety Bond Guaranty (SBG) Program. Until September 30, 2010, the U.S. Small Business Administration (SBA) is authorized to guarantee bonds on Contracts of up to $5,000,000 (or up to $10 million based upon the certification of a Federal contracting officer). SBA is further authorized, until September 30, 2010, to partially deny liability under its bond guarantee, but cannot deny liability in whole or even in part on the basis of material facts disclosed to SBA in a guarantee application submitted under the Prior Approval Program. In addition to implementing these authorities, this rule also revises the size standard for participation in the SBG Program, and makes several changes primarily for clarification purposes.