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XIT Vapor Extraction Unit (Attachment B) for Firestone Store, Stockton, CA page 3 of 5 of independently controlled electrical coils, pull a total of approximately 45 amps at 120 Volt, single phase, and are located at the perimeter and center of the oxidizer. During a twenty hour start up period, these coils reach their operating temperature. If, during normal operation, the VOC concentration in the process I stream 18 sufficient, the oxidation of the VOCs will generate enough thermal energy to periodically maintain an acceptable operating temperature. At this condition, current flow to the coils ceases. Temperature within the bed is constantly monitored in two different locations to assure adequate operating temperatures. The VES will enter the shutdown mode should the oxidizer drop below normal operating temperatures. 2. 4 Air Compressor The air compressor supplies compressed air at approximately 6. 3 cfm at 100 psi. The function of the I air compressor is to actuate the automatic dilution valve, and the four valves which control flow direction. 2. 5 Valving IHV-1, PV-11 The manual dilution valve (HV-1 ) is a twelve position butterfly valve which allows an operator to adjust the VOC concentration and/or flow from the extraction wells during start-up and periodic maintenance. The automatic dilution valve (PV-1 ) me a 6" butterfly valve. This valve will purge the VES as a result of high LEL concentration, and during changes in the direction of flow. IAs an option, the automatic dilution valve (PV-1 ) can be a modulating butterfly valve which is mechanically I actuated (optional) . This valve will regulate the VOC concentration in the process stream. 2. 6 Enclosure The electrical enclosure is rated NEMA 4 and houses most of the electrical components. 3. 0 MAJOR INSTRUMENTATION 3. 1 LEL Monitor (AT-1 ) Ryan-Murphy Incorporated "The Good Earth Company"