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24 FIGURE 12 Forecast 2001 APF 60 dB DNL with NCP implemented. 1998 NEM. Collier County adopted the resolution in June the proposed development with the airport. The County Spe- 2000. That same month, the NAA requested the County use cial District is incorporated directly in the zoning code, which the five-year forecast case (2005) 60 dB DNL contour from provides applicants and county staff the ability to readily iden- the 2000 NEM Update for future land use planning. The tify whether proposed development is located in the County county updated its zoning map in December 2000 to reflect Special District. As part of the county staff's review of the those contours. development application, staff considers whether the appli- cant has included necessary information to ensure compli- ance with the noise compatibility standards identified in the City and County Development Application Processes Land Development Code (i.e., land use restrictions, notifica- tions, and sound insulation). In 2001, NAA staff met with city and county staff to review the processes that they follow on a day-to-day basis to iden- tify development applications for properties located in the DALLAS/FT. WORTH INTERNATIONAL AIRPORT City Special District and the County Special District. As dis- cussed previously, both of these overlay districts are based Dallas/Ft.Worth International Airport (DFW) has used "policy on 60 dB DNL contours. For the city, any applicant propos- contours" to guide development of residential and other noise- ing development in the City Special District must submit a sensitive land uses around the airport. The contours are based General Development Site Plan that provides the city coun- on projections of ultimate aircraft noise made in the 1970s. cil and staff the opportunity to consider the compatibility of These policy contours are larger than "acoustic" contours that
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25 would reflect actual operations in recent years, yet provide a velopment of terminals. Neighboring cities challenged buffer to protect the airport. However, DFW is coming under DFW Airport on zoning authority; court tests ensued on increasing pressure from landowners to revise its policy con- the EIS. In 1992, the FAA issued a Record of Decision; tours and allow development closer to the airport. this decision also required DFW to "implement an extensive noise mitigation program . . . to mitigate for the increased noise levels to residences and other noise- Noise Contour History sensitive uses." · The most recent DNL contours for DFW were prepared DNL contours have been developed for DFW on the follow- in 2002 for the Environmental Assessment of new ing occasions: RNAV flight procedures. Those contours show that the 65 DNL noise contour for 2002 is almost entirely · In 1971, the North Central Texas Council of Govern- within the airport property boundary. ments developed a forecast set of DNL contours for future 1985 activity. These contours have been used Figure 13 presents a comparison of DNL 65 contours at over the years as policy contours and serve as an impor- DFW over time, including the North Central Texas Council tant factor in minimizing and preventing incompatible of Governments contours prepared in 1971 (for 1985 future land use from developing around DFW. operations--the policy contour); 1992 contours prepared for · In the early 1990s, DFW prepared DNL contours for an the Final EIS, and 2002 contours prepared for the RNAV EIS for the construction of two new runways and rede- Environmental Assessment. FIGURE 13 Comparison of historic DNL contours at DFW.
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26 Dallas/Fort Worth Noise Program 65 noise contour based on an acoustic contour of today; hence, DFW protects a substantial amount of land in its Most of DFW's noise program is focused on areas outside environs that is outside of the current 65 DNL. DNL 65, including: · A state-of-the-art monitoring system to track noise lev- els over time. · Operational procedures to minimize noise in neigh- borhoods surrounding the airport: the FAA has imple- One of the biggest challenges currently facing the airport is mented precision navigation procedures for departures the continued application of policy contours for land use plan- using RNAV; this is estimated to improve efficiency and ning that does not reflect acoustic reality. DFW has committed reduce noise in some areas--all outside DNL 65. to update noise contours by 2009. An important question · Policy contours that limit noise-sensitive development remains over whether local jurisdictions will adopt updated in noncompatible areas. The DNL 65 noise contour as noise contours for land use planning purposes, which will no depicted on the policy contour is well outside the DNL doubt result in noise-sensitive development closer to DFW.