Specifications include, but are not limited to: The System must include a Gas Chromatograph, Mass Spectrophotometer, and Data System (Computer, Printer, and Software). Gas Chromatograph must have the following minimum specifications and include a column oven, injection port and autosampler: Must have capability to accurately and reproducibly execute up to 20 oven ramps and 21 oven plateaus in a run. Must be able to execute negative temperature ramps. Must be able to execute three pressure / flow ramps in a run. Control of six heated zones (two inlets, two detectors and two auxiliary,) in addition to the GC oven. Functional keyboard with a four-line alphanumeric display. Run time programming. Clock time programming. Stopwatch function.