1. The compatible autoGC system includes the following. A. Sample introduction system to collect ambient air B. Moisture management system to condition sample C. Cryogenically or thermoelectrically cooled sample concentration system D. Sample focusing and thermal desorption system for sample injection E. Dual-column gas chromatography system for separation of sample compound F. Flame ionization detection system 2. System must be compatible with existing equipment which currently includes the following. A. AutoGC: Perkin Elmer Thermal Desorption 100TD Ozone Precursor B. Blender: Merlin MicroScience Dilution MMDS-VOC C. Thermal Desorber: Perkin Elmer TD100 D. TOC: Parker Balston 125075-83NA, 72-007 E. Zero Air Generator: Parker Balston 75-83 F. Computer: Dell Optiplex 3. Blender hardware shall be included with this system. The blender system will meet the following requirements: A. The blender includes a dilution system capable of blend ratios from 0.2 to 0.0053 with zero pressures not to exceed 40 pounds per square in gauge (psig) or flows of 150 standard cubic centimeters per minute (sccm) and span pressures not to exceed 30 psig or flows of 10 sccm. B. The dilution system must be humidified and contain the necessary valving to allow automated introduction to the TD-GC-FID system, which can be controlled by the chromatographic data system.