The Environmental Protection Agency is approving a site- specific revision to the Minnesota particulate matter (PM) State Implementation Plan (SIP) for Lafarge Corporation's (Lafarge) facility located on Red Rock Road in Saint Paul, Ramsey County, Minnesota. By its submittal dated July 18, 2002, the Minnesota Pollution Control Agency (MPCA) requested that EPA approve Lafarge's state operating permit into the Minnesota PM SIP. The request is approvable because it meets the requirements of the Clean Air Act (Act). The rationale for the approval and other information are provided in this rulemaking action.