Item E7
Gdwin O. Swift, III
suite 224
20/ front street
key west, ~ 33040
(305) 294-4/42
January 19, 2005
Dear Commissioners:
The color map enclosed is one of many that depicts various change~ in theJ997 AICUZ
Zone.
This map in particular shows the increased area of the new 2004 AICUZ in pink and the
decreased AICUZ area (yellow) from the 1977 area.
What is disconcerting is that the AICUZ has dramatically shifted from relatively sparsely
populated areas into the heavily developed areas of Stock Island, Key Haven and even a
small part of Key West.
The change in projected flight patterns andthe subsequent hazard and noise zones is
something that your constituents will certainly take.note orand be affected by.
Sincerely yours,
EOS/mhc
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NOISE
4.5.3 CY07 & 1977 AICUZ Noise Exposure Comparison NAS Key West
The 1977 AICUZ Study used the obsolete Composite Noise Rating (CNR) as the noise metric while
CY07 noise has been measured in the newer and widely accepted DNL values. The DOD and Navy
switched from predicting noise impact with the CNR noise metric to the DNL metric in the late 1970s. In
general, CNR is a subjective noise measure and attempts to predict an individual's probability for noise
complaints, where as DNL is an objective noise measure that attempts to predict the impact of noise on a
person's health and welfare and is the standard metric used by the DoD, FAA and other Federal Agencies
in describing environmental noise since the late 1970s.
While CNR and DNL are not directly comparable, CNR Zones 2 and 3 are similar to DNL Noise Zones 2
and 3 respectively and can be generally thought of from that perspective. A comparison of the CY07 and
1977 AICUZ noise is shown in Figure 4-4.
There would be a decrease in off-base noise exposure in Noise Zone 2 between the 1977 AICUZ study
and the projected 2007 noise contours for some areas. Land areas previously included in noise zone 2
would be reduced to the north and east of the airfield on Big Coppitt Key and Shark Key. These areas are
largely developed, although some undeveloped property exists. Some areas covered by the projected
2007 noise contours are increased over the largely developed areas of Raccoon Key, Stock Island and a
small area of Key West at the end of the Key West International runway. There would be a decrease in
off-base noise exposure in Noise Zone 3 on Big Coppitt Key, East Rockland Key, Geiger Key and Boca
Chica Key with to the North and East and a slight expansion of the noise contours slightly to the West,
including small portions on the edges of Stock Island and Raccoon Key. A comparison of the
approximate off-base areas included in Noise Zone 2 and Noise Zone 3 are shown in Table 4-3 below.
Table 4-3 Approximate Private Off-Base Land Areas included in 1977 and eY07 Noise
LanqA~eo 1911(Acre~) LClIld Area 2007 (Acres)
Noise Zones 2 & 3 1,493 I ,937
Land Purchased in 1 980s by Navy 61 7
Totals I ,493 I ,320
Source: Environmental Assessment (EA) for Fleet Support and Infrastructure Improvements NAS Key West, April 2003.
NAS Key West AICUZ Update
4-9