TagEthylene Gycol(2)

RE: Your letter of November 17th to Mr. Paradee regarding the use of ethylene glycol at the Sea-Tac Airfield Dear Ms. Stuhring: Your letter has been forwarded to me for response. Please excuse the delay. With regard to the use of ethylene glycol: The Federal Aviation Administration (FAA) approves or disapproves the use of deicing agents on airplanes. The Port of Seattle has no control over what is used on airplanes. The airlines do the deicing of their airplanes, not the Port, and must comply with all FAA regulations. Currently, the FAA allows only, and I stress only, the use of ethylene or propylene glycol. The airlines are not allowed to use any other chemicals for deicing. All deicing of airplanes occurs at the terminals or near hangers. I wish to stress that the areas where airplanes are deiced drain to the airfiled waste water treatment system, where the water is treated and then discharged to Puget Sound via a long outfall. These waters are not discharged to either Des Moines or Miller's creeks. The Port's rea~ment plant is not designed to treat glycols. However, the Port is currently evaluating alternative ways of modifying or adding to the treatment plant to treat the glycols. Again, I want to stress that these waters are not discharged to either Miller or Des Moines Greeks. The Port has not yet received a new permit from the Department of Ecology and therefore we do not know the new requirements. The Port does anticipate the…

RE: Your letter of November 17th to Mr. Paradee regarding the use of ethylene glycol at the Sea-Tac Airfield Dear Ms. Stuhring: Your letter has been forwarded to me for response. Please excuse the delay. With regard to the use of ethylene glycol: The Federal Aviation Administration (FAA) approves or disapproves the use of deicing agents on airplanes. The Port of Seattle has no control over what is used on airplanes. The airlines do the deicing of their airplanes, not the Port, and must comply with all FAA regulations. Currently, the FAA allows only, and I stress only, the use of ethylene or propylene glycol. The airlines are not allowed to use any other chemicals for deicing. All deicing of airplanes occurs at the terminals or near hangers. I wish to stress tltat the areas where airplanes are deiced drain to the airfiled waste water treatment system, where the water is treated and then discharged to Puget Sound via a long outfall. These waters are not discharged to either Des Moines or Miller's creeks. The Port's treatment plant is not designed to treat glycols. However, the Port is currently evaluating alternative ways of modifying or adding to the treatment plant to treat the glycols. Again, I want to stress that these waters are not discharged to either Miller or Des Moines Greeks. The Port has not yet received a new permit from the Department of Ecology and therefore we do not know the new requirements. The Port does anticipate the…