Data Inputs  Description  Source  the tank allows the use of default values  for vapor pressure and density. Fuel vapor  pressure and density for each storage tank  are required to calculate emission losses.  Liquid Storage Tanks , of EPA's AP -42 included in FAA’s EDMS/AEDT and in EPA’s  TANKS program.  Meteorological  Data  Data such as average wind speed, average  daily ambient temperature range, averag e  daily  solar  insulation,  and  average  atmospheric pressure values are  each required for the emission calculation.  Information is included in EPA’s program which contains a database of necessary climatic information for over cities in the U.S., so that only the closest nearby  city needs to be specified by the user.  Fuel Throughput  Annual fuel throughput is necessary to  calculate  emission  losses.  Annual  throughput is expresses in gallons per year.  Information should be obtained from the airport  operator and/or fueling contractor.  Tank-specific  characteristics  These characteristics include one or mor e  of the following: type of seals, breath er  vent settings, tank paint color, number o f  vacuum breakers, number of colum ns,  effective column diameter, deck fitti ng  types, and deck seam length.  This information may be obtained from airport  operator,  fueling  contractor, manufacturer, or by visual inspection of tank(s). Default values are given in Chapter Liquid Storage Tanks , of EPA's AP-42 and are incorporated into FAA’s EDM S/AEDT and  EPA’s TANKS program.  Source:  Emissions and Dispersion Modeling System (EDMS) User’s Manual , FAA-AEE-07-01 (Rev. 10 – 06/07/13), June  2013,  http://www.faa.gov/about/office_org/headquarters_offices/apl/research/models/edms_model/media/EDMS_5.1.4_User_Manual  .pdf, and Chapter 7,  Organic Liquid Storage Tanks,  of EPA's AP-42, http://www.epa.gov/ttnchie1/ap42/ch07/.  Some airports are likely to have a power generating facility associated with its  activities, which  in turn might also have cooling towers. Cooling towers are heat exchangers that are used dissipate large heat loads to the atmosphere. Although cooling towers can be classified several  ways, the primary classification is dry or wet tow ers, and some hybrid wet -dry combinations  exist. Dry-cooling towers use air instead of water to cool the steam exiting a turbine . Wet, or  evaporative, cooling towers rely on the latent heat of water evaporation to exchange between the process and the  air passing through the cooling tower. In hybrid wet -dry systems,  both wet and dry components are included in the system, and they can be used separately simultaneously for either water conservation or plume abatement purposes.  Cooling towers may range in size from ones used for small air conditioning to large power plant  cooling towers. Air pollution control equipment such as drift eliminators are typically used cooling towers. These capture water droplets entrapped in the air stream that otherwise would be  lost to the atmosphere. Because the drift droplets generally contain the same chemical impurities  as the water circulating through the tower, these impurities can be converted to emissions. Drift droplets may evaporate before being deposited in the area surrounding tower, and they  can produce PM 10  emissions. PM 10  emissions are generated  when the drift  A5.3.2  Cooling Towers  APPENDIX A5$_{ }$ 34$_{ }$