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19 Table 11 shows the feedback from survey respondents on that move beyond environmental performance and also measuring and monitoring systems at their airports. Respon- address social and economic performance. dents from 16 U.S. airports and 9 non-U.S. airports identi- fied some kind of EMS in place at their airport; however, The respondents from one large U.S. airport said that its only 2 respondents from large U.S. airports in the study EMS is compliant with and audited by the EPA. A Canadian have an EMS that is certified to ISO 14001. Alternatively, airport respondent said that its EMS is integrated with its all five respondents from continental European airports and health and safety management system. one from Canadian airports have an EMS that is certified to the standard. Only one of the continental European airports Interestingly, all airports that have an ISO 14001 certified reported using the EMAS. EMS also publicly report sustainability performance against the Global Reporting Initiative (GRI) guidelines. Respondents from a large U.S. airport and an airport in continental Europe described best practice management plans or comprehensive sustainability management systems Water Water Conservation Table 11 Proportion of respondents from U.S. and non-U.S. Only 1% of the earth's water is available for human use, Airports identifying environmental monitoring and even though both the population and the demand on or measuring systems at their airport freshwater resources are increasing, supply remains con- Systems in Place to Measure and Monitor stant. Managing water is a growing concern in the United Environmental Performance States as communities across the country face water sup- ply and water infrastructure challenges ("Why We Need Watersense" 2007). EMAS Registration EMS (uncertified) EMS (ISO14001) A new facility reprocesses highly concentrated Airport wastewater from de-icing operations by means of distillation. The resulting solution (approximately 65% Other Size/ Region Description propylene glycol) is reprocessed at a recycling facility operated by Clariant at Munich Airport and turned into U.S. Airports a de-icing agent. The distillate is disposed of through Non- the spray irrigation system (see Figure 6). 0% 100% 0% 0% Hub (1) · Storm water Small Pollution 0% 50% 0% 50% Hub (2) Prevention Plan Medium 0% 100% 0% 0% Hub (4) · Best Practice Management % Respondents Large Plans 22% 44% 0% 22% Hub (9) · Permit Tracking System Non-U.S. Airports Conti- · Sustainability nental 100% 0% 20% 20% Management Europe System FIGURE 6Treatment of wastewater from de-icing operations (5) at Zurich Airport. Asia (1) 0% 100% 0% 0% United Operation of airports--from cargo to passenger terminals Kingdom 0% 100% 0% 0% to airline movements--requires the use of water. Ensuring (1) efficient use can minimize waste and conserve this precious Canada resource. Even seemingly small efforts help--at Los Angeles 50% 100% 0% 0% (2) International Airport, maintenance staff phone numbers are