Method 0040 is designed, using gas sampling bags, for sampling principal organic hazardous constituents from combustion sources like hazardous waste incinerators. This non-isokinetic method uses a constant or proportional sampling rate dependent upon the extent and variability of the emission flow rate (Method 2). The Apex Instruments Method 0040 Kit (SK-0040) utilizes the VSB2 VersaCase cabinet, glass lined probe assembly, glassware, coolant reservoir with submersible pump, bag enclosure and umbilical cord for connection to the XC-60 or Model 623 source sampler console.