SITE INFORMATION AND CORRESPONDENCE

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Mr . William S . Rickman Page 2 July 29, 1988 a potential hazard to human health and safety, livestock or wildlife because of its low concentration, and chemical characteristics. Therefore, DHS hereby grants a variance from the hazardous waste facility permit requirements for the limited term demonstration project you plan to conduct, subject to the following conditions: A. Public Input 1. DHS reserves the right to modify conditions in this variance at any time if input from the public or other public agencies warrants such modifications. 2. Before operating the circulating bed combustor, ' a public workshop shall be held to disseminate information regarding the CBC technology and to seek and address public comments on this project. B. .Operating Conditions Either column I or II must be complied with: I. 1. The one minute average II. 1. The one minute average combustion temperature must combustion temperature must be equal to or greater than be equal to or greater than 14250F. 15000F. 2. The one minute average 2. The one minute average combustion gas residence time combustion gas residence time must be equal to or greater must be equal to or greater: than 1.4 seconds. than 1.5 seconds. 3. The one minute average 3. The one minute average combustor exit gas carbon combustor exit gas carbon monoxide concentration must be monoxide concentration must be less than 250 ppm V (dry) less than 100 ppm V (dry) corrected to 7% 02. corrected to 7% 02- 4. The one minute average 4. The one minute average combustor exit gas oxygen combustor exit gas oxygen concentration must be greater concentration must be greater than 5.3 Vol 8 (dry) . than 3.0 Vol 8 (dry) . 5. The one minute average 5. The one minute average combustor exit gas total combustor exit gas total unburned hydrocarbon (measured unburned hydrocarbon (measured as methane) concentration must as methane) concentration must be less than 100 ppm V (dry) be less than 50 ppm V (dry) corrected to 7% 02. corrected to 78 02.