CC-89-039: Promulgation of Source Test Methods lA, 2C and 2D for Small Diameter Stacks and Vents

The attached material appeared in the March 28, 1989 Federal Register. It is a final EPA rule promulgating source test Methods 1A (Sample and Velocity Traverses for Stationary Sources with Small Stacks or Ducts), 2C (Determination of Stack Gas Velocity and Volumetric Flow Rate in Small Stacks or Ducts), and 2D (Measurement of Gas Volumetric Flow Rates in Small Pipes and Ducts).