# MEMORANDUM

TO: Jan Matuszko. EPA

FROM: Brian D’Amico, EPA

DATE: February 27, 2012

SUBJECT: Methodology for Applicability of Dete rmination of New Source Performance

Standards

Introduction

The proposed rule defined the threshol d for the new source ADF collection and

associated discharge requirements as any new source with 10,000 or more annual departures. As

was the case with existing sources, commenters expl ained that the number of departures is not a

good analog for the amount of ADF usage, citing, for example, airports in the South that may

have significant numbers of depart ures but typically need to deice their aircraft only once a year.

Moreover, commenters indicated that not all applied ADF is equivalent; specifically ADF

applied for defrosting. Commenters explained that defrost deicing evaporat es and does not leave

ADF available for collection. Afte r reviewing these comments and the information in its record,

EPA agrees that departures al one are not the most appropriate metric for NSPS applicability.

After considering these comments, EPA agrees that defrost deicing is not available for

collection and, as such, ADF collect ion technologies are infeasible at airports that predominantly

perform defrost deicing. As detailed in DCN AD01335 (“Defros t Deicing and F easibility of

ADF Collection Technologies”), and based on in formation from the airport questionnaire for

existing facilities, EPA determined an ADF usag e cut-off of 30,000 gallons per year to exclude

facilities that predominantly perform defrost deicing.

In establishing the applicability for new source ADF collection and treatment

requirements, EPA wanted to take into account th at ADF collection technologi es are infeasible at

airports that predominantly perform defros t deicing. Unlike existing sources, however, new

sources do not have past ADF usage data availabl e for establishing a thre shold for being subject

to ADF collection requirements.

Available Data

For EPA’s final regulation, the definition of a new source has been revised to only

include new airports. These ne w facilities will not have histor ical ADF application data upon

which to base NSPS applicability, As such, EP A attempted to find historical and publicly

available data to gauge probable ADF usage. In pa rticular, EPA wanted to see if available data

could be used to determine, based primarily on geographic location, if a new airport would likely

have annual ADF usage in excess of 30,000 gallons.

EPA evaluated several climatic elements to determine regional applicability for NSPS.

The National Climatic Data Center (NCDC), an or ganization affiliated with the National Oceanic

and Atmospheric Administration, deve lops maps of available data for climatic elements such as

temperature, precip itation, snow, wind, pressure, etc. One of these elements is U.S. Mean Total

# Memorandum

February 27, 2012

Page 2

Heating Degree Days (HDD). EPA determined HDD as the most suitable means determining

NSPS applicability. EPA selected the HDD measur ement for NSPS applicability since NCDC

temperature data are collected nationally, publicly available from NOAA’s website, and

represent long-term climate data. HDD is a specific climatic elemen t that has been calculated by

NCDC. The following excerpt is a de scription of how HDD are derived:

This element was computed using data from the National Climatic Data Center's (NCDC) U.S.

National 1961-1990 Climate Normals 1 

# . The original data is in whole degrees Fahrenheit. This

element is given to whole degree days. Heating degree day values were derived from a base of 65

degrees Fahrenheit. Simple arithmetic procedures were not applied to obtain the heating degree

day values. Instead, the rational conversion formulae developed by Thom 2,3 

# were used. These

formulae allow the adjusted mean temperature no rmals and their standard deviations to be

converted to degree day normals with uniform cons istency. In some cases this procedure will yield

a small number of degree days for months when degree days may not otherwise be expected. This

results from statistical considerations of th e formulae. The annual degree day normals were

calculated by adding the corresponding monthly degree day normals. 4



# The HDD maps used in EPA’s analysis can be downloaded in a high resolution Adobe

PDF format, or as ESRI Shape Files. The da ta can be accessed on NCDC’s website using the

following weblink:

http://cdo.ncdc.noaa.gov/cgi-bin/climaps/ climaps.pl?directive=welcome&subrnum =

The entire data set of climate maps availa ble on NCDC’s website is also available for

purchase on NCDC’s Climate Atlas of The Conti guous United States CD-ROM.

Methodology

In evaluating potential NSPS applicability th resholds, EPA compiled data on all existing

airports that responded to the ques tionnaire, a statistical sample of all airports in the US. This

data included location, HDD categor y of each airport, total a nnual departures, questionnaire

responses on implemented collection technologies, and EPA estimated collection efficiencies.

EPA used this data to attempt to determine a me tric upon which it could be fairly confident that a

new airport would likely have annual ADF usage in excess of 30,000 gallons (See Table 2)

The first step EPA took in analyzing th e data was grouping the airports by HDD

Category (see Table 1).

Table 1. HDD Category Ranges

HDD Category HDD Range

A <1001

B 1001-2000

C 2001-3000

Monthly Normals of Temperature, Precipitation, and Degree Days for the U.S., National Climatic Data Center, Federal Building, 151 Patton

Ave., Asheville, NC, 28801-5001.

rational relationship between heating de gree days and temperature," Monthly W eather Review, Vol. 82, pp. 1-6.

"Normal degree days above any base by the universal truncation coefficient," M onthly Weather Review, Vol. 94, pp. 461-465.

# Memorandum

February 27, 2012

Page 3

D 3001-4000

E 4001-5000

F 5001-6000

G 6001-7000

H 7001-9000

I >9000

The grouping demonstrated that, in almost a ll cases, airports in HDD categories A-C used

less than 30,000 gallons of ADF a nnually. Therefore, EPA could be confident that new airports

in HDD categories A-C would lik ely use less than 30,000 gallons of ADF annually. As such,

HDD category was an appropriate ba sis to exclude new airports in these zones from the NSPS

ADF collection and treatment requirements.

However, the data also demonstrated that a portion of airports in HDD categories D-I

also used less than 30,000 gallons of ADF annuall y. A review of the data for airports in HDD

categories D-I demonstrated that, with few excep tions, applying the departure cut-off originally

proposed as the basis for ADF collection and treatment NSPS a pplicability, 10,000 annual

departures, would exclude airpor ts in these categories that us e less than 30,000 gallons of ADF

annually. Therefore, EPA determined that airp orts in HDD categories D-I with planned annual

departures of at least 10,000 woul d likely use in excess of 30,000 ga llons of ADF, making this an

appropriate criteria for dete rmining NSPS applicability.

The following discusses EPA’s evaluation of feas ibility of deicing pads for airports in

HDD zones D-I for airports with annu al departures in excess of 10,000.

Category D

EPA’s questionnaire identified a total of 11 airports (after applying statistical weights)

located in HDD Category D. Six (6) of these air ports identified collection technologies that they

had implemented to capture spent ADF. Additiona lly, two of these six ai rports had implemented

deicing pads including; Northw est Arkansas Regional Airport, the airport with the fewest

departures and lowest amount of ADF applie d annually. The presence of deicing pads,

particularly at Northwest Arkans as clearly indicates that deici ng pads are feasible in this HDD

category.

Category E

EPA’s questionnaire identified a total of 14 airports (after applying statistical weights)

located in HDD Category E. Nine (9) of those airports have implemented collection

technologies to capture spent ADF including ce ntralized deicing pads and plug and pump

systems. The frequent presence of these collec tion technologies and especially the presence of

deicing pads, clearly indicates that deici ng pads are feasible in this HDD category.

Category F

EPA’s questionnaire identified a total of 17 airports (after applying statistical weights)

located in HDD Category F. Seven (7) of the 17 airports have implemented collection

technologies to capture spent ADF including ce ntralized deicing pads and plug and pump

systems. The frequent presence of these collec tion technologies and especially the presence of

deicing pads, clearly indicate that deicing pads are feasible in this HDD category.

# Memorandum

February 27, 2012

Page 4

Category G

EPA’s questionnaire identified a total of 23 airports (after applying statistical weights)

located in HDD Category G. Thirteen (13) of those airports have implemented collection

technologies to capture spent ADF including ce ntralized deicing pads and plug and pump

systems. The frequent presence of these collec tion technologies and especially the presence of

deicing pads, clearly indicates that deici ng pads are feasible in this HDD category.

Category H 5



# EPA’s questionnaire identified a total of eight (8) airports (after applying statistical

weights) located in HDD Category H. Four (4) of those airports have implemented collection

technologies to capture spent ADF including ce ntralized deicing pads and plug and pump

systems. The frequent presence of these collec tion technologies and especially the presence of

deicing pads, clearly indicates that deici ng pads are feasible in this HDD category.

Alaska

EPA surveyed a total of six (6) Alaskan airpor ts that meet the NSPS departure thresholds.

Five of these airports are lo cated in HDD Category I and one is located in HDD Category H.

Based on this data, the correlation between HDD Category, ADF usage, and departures found in

the lower 48 states does not hold true to Alaska n airports. As such, EPA finds that neither

geography nor, departures, (or a combination of th e two) is an appropriate metric to determine

NSPS collection and treatment applic ability for Alaskan airports.

In addition, EPA received comments questio ning the feasibility of ADF collection

technologies for airports located in Alaska. Th ese commenters stated th at deicing wastewater

generation at Alaskan airports is substantially different from ai rports in the lower 48 states.

First, often airports in Alaska will susp end air traffic as opposed to conducting deicing

operations. Second, commenters stated that long periods of below freezing temperatures result

in runoff characteristics that are substantially di fferent from those is the lower 48 states and, as

such, deicing materials are not av ailable for collection (due to l ack of runoff) making collection

technologies infeasible. Based on this data, EPA is unable to conclude that Alaskan airports

conduct significant deicing, rather than defrosting, and as such, it is appropriate to exclude new

airports in Alaska from the NSPS ADF collectio n and treatment requirements. The new source

performance standards for Alaskan airports will therefore continue to be determined on a caseby-case, site-specific basis.

5 

# EPA also identified one Alaskan airport in Category H, Juneau International Airport. This airport is not counted as

part of this analysis and is analyzed under the Alaska Airports.Table 2. Airport Geographic and Collection DataAirportIDAirport NameAirportStateAirportWeightingFactorADF Usage(normalizedgallons/yr)HDDCategoryTotalDepartures6PercentCapture7Facility ReportedCollectionTechnologyAssessedCollectionTechnology81006Chicago O'Hare IntlAirportIL11,516,626G467,72140All deicingdrainage toPOTWPlug andPump1011Lambert-St. LouisIntl AirportMO1325,122E129,41460Deicing at deicingpads and otherlocationsDeicing Pads1020Hartsfield-JacksonAtlanta Intl AirportGA1362,235D459,76560Deicing at deicingpads and otherlocationsDeicing Pads1023Seattle-Tacoma IntlAirportWA1157,464E166,7880Some stormwaterdrainage, pondcollectionDeicing Padsplus treatmenttechnologies1026Dallas/Fort WorthIntl AirportTX1166,790C360,93360Deicing only atdeicing padsDeicing Pads1028Denver Intl AirportCO11,053,570G264,05199Deicing at deicingpads and otherlocationsDeicing Padsplus treatmenttechnologies1029La Guardia AirportNY1485,158E192,1270Drainage systemNone1033McCarran IntlAirportNV110,644C188,97240GCVsPlug andPump1034MetropolitanOakland Intl AirportCA1N/AC87,308100NoneZeroDischarge1035San Diego IntlAirportCA1N/AB93,885100NoneZeroDischarge1036Baltimore -Washington IntlAirportMD1323,623E124,03360Deicing at deicingpads and otherlocationsDeicing Pads6Departures based on data reported in 2006 to Bureau of Transportation Statistics7See DCN AD01270 for EPA’s assessment8IbidMemorandumFebruary 27, 2012Page 6AirportIDAirport NameAirportStateAirportWeightingFactorADF Usage(normalizedgallons/yr)HDDCategoryTotalDepartures6PercentCapture7Facility ReportedCollectionTechnologyAssessedCollectionTechnology81037George BushIntercontinentalAirportTX110,243B248,33940GCVsPlug andPump1042Orlando Intl AirportFL1N/AA155,272None1053Logan Intl AirportMA1985,296F186,2530Drainage systemNone1055Miami Intl AirportFL1N/AA153,684None1066Salt Lake City IntlAirportUT1570,540F160,47260Deicing at deicingpads and otherlocationsDeicing Pads1073Honolulu IntlHI1N/A<3,000None1083Tampa Intl AirportFL1N/AA100,756100NoneZeroDischarge1089John F Kennedy IntlAirportNY1560,031F154,6060Drainage systemNone1093Los Angeles IntlAirportCA1N/AB296,032None1095Chicago Midway IntlAirportIL1293,834G108,385100Drainage to POTWAll gate, ramp,apron, runwayareas toPOTWdischarge.1106FortLauderdale/Hollywood Intl AirportFL1N/AA111,196None1107Pittsburgh IntlAirportPA1943,982F125,14360Deicing at deicingpads and otherlocationsDeicing Pad1113Cincinnati/NorthernKentucky IntlAirportKY1722,995F247,16593Deicing only atdeicing padsDeicing Padsand treatmenttechnologyMemorandumFebruary 27, 2012Page 7AirportIDAirport NameAirportStateAirportWeightingFactorADF Usage(normalizedgallons/yr)HDDCategoryTotalDepartures6PercentCapture7Facility ReportedCollectionTechnologyAssessedCollectionTechnology81126Minneapolis-St. PaulIntl/Wold -Chamberlain AirportMN11,456,538H246,28660Deicing at deicingpads and otherlocationsDeicing Pad1128Charlotte/DouglasIntl AirportNC1143,572D214,3960Drainage systemNone1133Sky Harbor IntlAirportAZ1N/AB230,88620GCVsGCV1138Detroit MetropolitanAirport WayneCountyMI12,152,292G250,629100Deicing at deicingpads and otherlocationsDeicing Padsplus treatmenttechnologies.EPA collectedsampling data.1139Philadelphia IntlAirportPA1979,983E227,74985Deicing at deicingpads and otherlocationsCentralizedDeicing Pads1141Ronald ReaganWashington NationalAirportDC1219,533E134,34640GCV + DrainBlockers Deicingat gates, deicingpads and otherlocationsPlug andPump1142Washington DullesIntl AirportVA11,076,083E238,63540GCV + DrainBlockers Deicingat gates, deicingpads and otherlocationsPlug andPump1143San Francisco IntlAirportCA1105C150,832100Vacuum scrubbercollectionZeroDischarge1145Newark Liberty IntlAirportNJ11,123,057F203,0820NoneNone1004Norfolk Intl AirportVA130,875D38,74720GCVsGCV1008Tucson Intl AirportAZ2.9997038122,342B26,69520GCVsGCV1012Ted StevensAnchorageAK1420,73588,12640GCV + Plug andPumpPlug andPumpMemorandumFebruary 27, 2012Page 8AirportIDAirport NameAirportStateAirportWeightingFactorADF Usage(normalizedgallons/yr)HDDCategoryTotalDepartures6PercentCapture7Facility ReportedCollectionTechnologyAssessedCollectionTechnology8International1014Albuquerque IntlAirportNM164,460E47,56920GCVsGCV1019Ontario Intl AirportCA134B48,8990Drainage systemNone1021Buffalo Niagara IntlAirportNY1284,654G41,91640GCV + Plug andPumpPlug andPump1024Indianapolis IntlAirportIN1452,155F83,76940Deicing at gates,deicing pads andother locationsPlug andPump1032Austin - BergstromIntl AirportTX124,044B50,41840Drainage systemPlug andPump1038Luis Munoz MarinIntlPR1N/A<3,000None1039KahuluiHI1N/A<3,000None1040Louis ArmstrongNew Orleans IntlAirportLA1N/AB58,928100NoneZeroDischarge1045Norman Y. MinetaSan Jose Intl AirportCA1N/AC65,60110GCVsGCV1057Will Rogers WorldAirportOK149,504D30,0010NoneNone1061William P HobbyAirportTX114,168B57,369100NoneZeroDischarge1068Eppley AirfieldNE1110,986G33,0220NoneNone1069Cleveland HopkinsIntl AirportOH1582,321G116,56940GCV + Plug andPumpPlug andPump1078Nashville IntlAirportTN191,543D76,70660Deicing at deicingpads and otherlocationsDeicing Pad1079Manchester AirportNH1177,307G34,8600Drainage systemNoneMemorandumFebruary 27, 2012Page 9AirportIDAirport NameAirportStateAirportWeightingFactorADF Usage(normalizedgallons/yr)HDDCategoryTotalDepartures6PercentCapture7Facility ReportedCollectionTechnologyAssessedCollectionTechnology81081Bob Hope AirportCA1N/AB30,446100Absorbed anddisposedZeroDischarge1086Palm Beach IntlAirportFL11,023A34,507100NoneZeroDischarge1099Sacramento IntlAirportCA1N/AC55,73220GCVsGCV1101Portland Intl AirportOR1112,086E96,47520GCVsGCV1102John Wayne Airport- Orange CountyCA1N/AB51,860100NoneZeroDischarge1108Louisville IntlAirport - StandifordFieldKY1128,409E65,58660POTW DiversionDeicing Pad1111Port Columbus IntlAirportOH1288,374F59,9380NoneNone1115Jacksonville IntlAirportFL11,001B40,383100NoneZeroDischarge1116Reno/Tahoe IntlAirportNV174,632F32,71420GCVsGCV1121Theodore FrancisGreen State AirportRI1150,127F43,67160GCVs with CatchBasin InsertsDeicing Pad1122Southwest FloridaIntl AirportFL1950A36,484100NoneZeroDischarge1129Bradley Intl AirportCT1427,068G51,38960Deicing at deicingpads and otherlocationsDeicing Pad1130San Antonio IntlAirportTX112,749B46,3890Drainage systemNone1136General Mitchell IntlAirportWI1152,944H85,12844Deicing at deicingpads and otherlocationsDeicing Padswith treatmenttechnologies1137Dallas Love FieldAirportTX137,219C44,01840Plug and PumpPlug andPump1140Memphis IntlTN1D0NoneNoneMemorandumFebruary 27, 2012Page 10AirportIDAirport NameAirportStateAirportWeightingFactorADF Usage(normalizedgallons/yr)HDDCategoryTotalDepartures6PercentCapture7Facility ReportedCollectionTechnologyAssessedCollectionTechnology8Airport199,174166,9101147Raleigh-Durham IntlAirportNC1102,451D86,3020Drainage systemNone1148Kansas City IntlAirportMO1203,725F76,01640Drainage systemPlug andPump1001MontgomeryRegional Airport(Dannelly Field)AL6.7012688232C5,3490Drainage systemNone1002Bert MooneyMT6.3713,592I2,136100Vegetated drainageswale to detentionbasinZeroDischarge1005Roberts FieldOR3.03698911314,987G6,331100Drainage tosurfaceimpoundmentZeroDischarge1007Yeager AirportWV2.15078753549,561E13,60640Deicing drainageat gates, deicingpads and otherlocations divertedto detention basinPlug andPump1016Tri-State/Milton J.Ferguson FieldWV8.08911752612,945E3,7940GCVs to deicingstormwater tankwhich isdischarged to theairport’s outfallNone1022Fort Wayne IntlAirportIN1.9682313950,412G16,2470GCVsNone1025Tupelo Regional14.18375347821D1,3570NoneNone1027Craven CountyRegionalNC9.011441189878C2,5970Deicing only atdeicing padsNone1030WilliamsportRegionalPA5.2656236510,071G1,99860Deicing PadsDeicing Pads1041Glacier Park IntlAirportMT3.14088767138,555H6,3800Drainage systemNone1043Ralph WienAK10Drainage systemNoneMemorandumFebruary 27, 2012Page 11AirportIDAirport NameAirportStateAirportWeightingFactorADF Usage(normalizedgallons/yr)HDDCategoryTotalDepartures6PercentCapture7Facility ReportedCollectionTechnologyAssessedCollectionTechnology8Memorial2,50015,3051044Roanoke RegionalAirportVA2.1920994432,927E13,0980NoneNone1048Redding MunicipalCA8.430143889692C3,2160NoneNone1049LanaiHI9.232574976N/A<3,0001050Aspen - PitkinCounty/Sardy FieldCO4.7515,018H3,90440Deicing at gates,deicing pads andother locationsPlug andPump1051Barnstable MuniBoardman/PolandoFieldMA1.83059312146,147G16,4960Deicing only atdeicing padsNone1052Wilmington IntlAirportNC6.0387841412,175C6,5870Drainage systemNone1054Jackson Hole AirportWY4.3534,131I4,660100NoneZeroDischarge1056Santa MariaPub/Capt G AllanHancock FldCA9.249000136N/AC100NoneZeroDischarge1060Williamson CountyRegionalIL6.920939638149E1,211100NoneZeroDischarge1063Evansville RegionalAirportIN5.10420227820,149E9,2200Drainage systemNone1067Helena RegionalAirportMT4.218,381H5,006100NoneZeroDischarge1071Tweed-New HavenCT5.0286371084,926F1,6020NoneNone1072Gillette-CampbellCountyWY7.61880H1,782100NoneZeroDischarge1082Trenton MercerNJ6.1575606775,393F1,8090Drainage systemNone1084Bismarck MunicipalAirportND3.86791113920,997H4,2070Drainage systemNone1085Waterloo MunicipalIA5.5958326H1,8570Drainage systemNoneMemorandumFebruary 27, 2012Page 12AirportIDAirport NameAirportStateAirportWeightingFactorADF Usage(normalizedgallons/yr)HDDCategoryTotalDepartures6PercentCapture7Facility ReportedCollectionTechnologyAssessedCollectionTechnology8187,8211088Outagamie CountyRegional AirportWI2.48406329857,845H10,2000NoneNone1091Rochester IntlAirportMN3.17490910934,556H6,24440GCVsPlug andPump1092Lewiston-Nez PerceCountyID4.8424,859F3,643100NoneZeroDischarge1094Boeing Field/KingCounty Intl AirportWA5.8985185045,156E6,90440Deicing at deicingpads and otherlocationsPlug andPump1096Santa Fe MunicipalNM6.4949876941,108F1,663100NoneZeroDischarge1097Lovell FieldTN4.9995583774,150D9,6100Drainage systemNone1098Aberdeen RegionalSD5.113,976H3,157100Deicing only atdeicing padsDeicing Padsplus1100Toledo ExpressAirportOH2.09174052846,449G14,38520GCVsGCV1104NomeAK13,047>3,00013,4050Drainage systemNone1114Stewart Intl AirportNY2.86610218632,276G7,66240Drainage tostorage and POTWPlug andPump1117Cherry CapitalAirportMI3.5411,524H7,038100NoneZeroDischarge1118BethelAK14,897>3,00040,3360NoneNone1119Rickenbacker IntlAirportOH4.36590427810,711F3,3020NoneNone1120Rapid City RegionalAirportSD3.10817550925,423H6,5150NoneNone1131Wilkes -Barre/Scranton IntlAirportPA2.68154000242,537G8,7530Drainage systemNone1132Chippewa ValleyRegionalWI11.8213,262H2,259100NoneZeroDischargeMemorandumFebruary 27, 2012Page 13AirportIDAirport NameAirportStateAirportWeightingFactorADF Usage(normalizedgallons/yr)HDDCategoryTotalDepartures6PercentCapture7Facility ReportedCollectionTechnologyAssessedCollectionTechnology81134St George MunicipalUT8.72833390913,950D2,985100NoneZeroDischarge1135Lafayette RegionalAirportLA6.6425415441,489B5,4440Drainage systemNone1144Central WisconsinAirportWI3.01563183643,624H6,9210NoneNone1010FairbanksInternationalAK183,33524,91960Drainage systemDeicing Pads1015Gulfport - Biloxi IntlAirportMS5.8412663281,551B7,040100NoneZeroDischarge1017Austin Straubel IntlAirportWI2.32693870562,133H11,62440Drainage systemPlug andPump1018Piedmont Triad IntlAirportNC168,741D38,2570Drainage systemNone1031Richmond IntlAirportVA159,337D35,38640Drainage systemand plug and pumpsystem.Plug andPump1046Long IslandMacArthur AirportNY1.99847360443,528F15,75960Stormwaterdrainage toretention basin.Deicing Pads1058Gerald R. Ford IntlAirportMI1.586216697,174H25,01540GCV + Plug andPumpPlug andPump1059Greater RochesterIntl AirportNY1229,158G35,72650Deicing at gates,deicing pads andother locationsDeicing Padsplus treatmenttechnologies1062Birmingham IntlAirportAL2.8409891665,002C29,7610Drainage systemNone1065Albany Intl AirportNY1125,775G39,32498GCV + Plug andPumpPlug andPump plustreatmenttechnologies.EPA samplingdata collected.1070Colorado SpringsAirportCO1.74136941875,817G20,75640GCVsPlug andPumpMemorandumFebruary 27, 2012Page 14AirportIDAirport NameAirportStateAirportWeightingFactorADF Usage(normalizedgallons/yr)HDDCategoryTotalDepartures6PercentCapture7Facility ReportedCollectionTechnologyAssessedCollectionTechnology81074South Bend RegionalAirportIN2.14167731529,585G13,722100NoneZeroDischarge1075Pensacola RegionalAirportFL3.934118879828B15,520100NoneZeroDischarge1077Kona Intl at KeaholeHI3.844027556N/A<3,000None1080Syracuse HancockIntl AirportNY1186,351G30,84060Deicing only atdeicing padsDeicing Pad1087City of El Paso IntlAirportTX3.04568777316,228C25,895100NoneZeroDischarge1090Boise AirportID1.50428809771,421F27,81460NoneDeicing Pad1103Juneau InternationalAK148,014>3,00023,0790Drainage systemNone1105Spokane Intl AirportWA1.51924612867,984G27,269100NoneZeroDischarge1123James M CoxDayton Intl AirportOH190,580F35,70960Deicing only atdeicing padsDeicing Pad1124Des Moines IntlAirportIA1.62106682880,455G23,95140Drainage systemPlug andPump1125Sarasota/BradentonIntl AirportFL5.184967746N/AA8,935None1146Northwest ArkansasRegionalAR1.87819628230,775<3,00015,8910Deicing at deicingpads and otherlocationsNone

# ESRI ArcExplorer 1.1

STATES

13 MEAN TOTAL HDD (HDD)

- ANNUAL -

A < 1001

B 1001 - 2000

C 2001 - 3000

D 3001 - 4000

E 4001 - 5000

F 5001 - 6000

G 6001 - 7000

H 7001 - 9000

I > 9000

TITLE