Specifications include, but are not limited to: 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 located at the Houston Deer Park & Corpus Christi Palm sites which includes the following. A. AutoGC: Perkin Elmer Thermal Desorption 300TD 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