JLUS Background Report sj_br_report_sm - Page 88

The main sources of noise at airfields are flight operations or pre‐flight and maintenance run‐ups . Computer models are used to develop noise contours based on information about these operations including : type of operation ( arrival , departure , and pattern ); number of operations per day ; time of operation ; flight track ; aircraft power settings , speeds , and altitudes ; number and duration of maintenance run‐ups ; terrain ; surface type ; and environmental data ( temperature and humidity ).
The Air Force considers how its operations impact the local community by calculating the day‐night average sound level ( DNL ). The DNL averages the noise levels of all aircraft operations that occur with a 24‐hour period . To assist the communities in land use decisions , the DOD uses decibel noise contours to illustrate the exposure to noise associated with aviation activities . For land‐use planning purposes , DNL noise zones are provided in increments of 5 dB between 65 dB and 85 dB .
Noise contours associated with the Seymour Johnson AFB were developed in 2011 based on existing and projected aircraft and are illustrated on Figure 3‐14 . The relatively high noise levels near the runway ( greater than a DNL of 85 dB ) result from departure operations .
In total there is approximately 18,777 acres in a noise zone associated with Seymour Johnson AFB operations . Of this land , 15,955 acres is located offinstallation :
• 8,175 acres of land in the 65‐69 DNL Noise Contour
• 4,622 acres in the 70‐74 DNL Noise Contour
• 2,316 acres in the 70‐74 DNL Noise Contour
• 680 acres in the 80‐84 DNL Noise Contour
• 162 acres in the 85 + DNL Noise Contour
Explosive Safety Quantity Distance Arcs The Explosive Safety Quantity Distance ( ESQD ) a has been assessed based on the impacts of the t stored . These arcs represent the setback distan or handling where inhabited facilities cannot be distances are based on the quantity and type of distance from the ordnance facility from which t damage is greatly reduced . Though the ESQD arc installation perimeter , the ESQD arc areas are un agreement between the Air Force and property development and habitable structures in this are Seymour Johnson AFB are illustrated on Figure 3
Seymour Johnson AFB has established ESQD arcs of the installation as shown in Figure 3‐15 . In ge beyond the installation boundary , easements are residential development . At the installation , the buildings within the ESQD arcs must be limited t effective mission accomplishment .
Bird / Wildlife Aircraft Strike Hazard Airports , due to the nature of their operations , t grassy areas where wildlife congregates . Additio golf courses , are often situated near airports bec the height and density restrictions imposed by a golf courses also have large , open , grassy areas a water – another wildlife attractant . Given the fat occur as a result of a bird and / or wildlife strike , recommendations for managing these types and wildlife attractants near airports .
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Explosive Safety Quantity Distance Arcs The Explosive Safety Quantity Distance (ESQD) arcs are the area where risk  has been assessed based on the impacts of the types of explosives being  stored.  These arcs represent the setback distance from the ordnance storage  or handling where inhabited facilities cannot be located. The setback  distances are based on the quantity and type of explosives and represent the  distance from the ordnance facility from which the potential for injury and  damage is greatly reduced. Though the ESQD arcs extend outside the  installation perimeter, the ESQD arc areas are under easement – an  agreement between the Air Force and property owner precluding any  development and habitable structures in this area.  The ESQD arcs at  Seymour Johnson AFB are illustrated on Figure 3‐15.       The main sources of noise at airfields are flight operations or pre‐flight and  maintenance run‐ups.  Computer models are used to develop noise contours  based on information about these operations including: type of operation  (arrival, departure, and pattern); number of operations per day; time of  operation; flight track; aircraft power settings, speeds, and altitudes; number  and duration of maintenance run‐ups; terrain; surface type; and  environmental data (temperature and humidity).   The Air Force considers how its operations impact the local community by  calculating the day‐night average sound level (DNL).  The DNL averages the  noise levels of all aircraft operations that occur with a 24‐hour period.  To  assist the communities in land use decisions, the DOD uses decibel noise  contours to illustrate the exposure to noise associated with aviation  activities.  For land‐use planning purposes, DNL noise zones are provided in  increments of 5 dB between 65 dB and 85 dB.      Seymour Johnson AFB has established ESQD arcs located at the western end  of the installation as shown in Figure 3‐15.  In general, where the Arcs extend  beyond the installation boundary, easements are in place to prevent  residential development.  At the installation, the construction of inhabited  buildings within the ESQD arcs must be limited to those facilities essential to  effective mission accomplishment.  Noise contours associated with the Seymour Johnson AFB were developed in  2011 based on existing and projected aircraft and are illustrated on  Figure 3‐14. The relatively high noise levels near the runway (greater than a  DNL of 85 dB *&W7VL*g&*FW'GW&\*W&F2*&&BvFƖfR&7&gB7G&R&@''G2*GV\*F*F\*GW&\*l*FV,*W&F2*G6ǜ*f\*&vR*V*w&77*&V<*vW&\*vFƖf\*6w&VvFW2* *FFFǒ*6\*L*W6W2*Ɩ\*vl*6W'6W2*&\*gFV*6GVFVL*V,*''G<*&V6W6\*FW*6*V6ǜ*VWL*F\*VvL*L*FV6G*&W7G&7F<*6VL*'*&7&gL*7FfG*Vf'GVFVǒ*vl*6W'6W<*6*f\*&vR*V*w&77*&V<*L*gFVFW<*6*fVGW&\*vFW,*( <*FW,*vFƖf\*GG&7FB*vfV*F\*fF*&֖f6F<*FL*6*67W,*<**&W7VL*l**&&L*L**,*vFƖf\*7G&R*F\*d*6WL*f'F*&V6VFF<*f,*v|*FW6\*GW<*L*FW,*GW<*l*&&L*L*vFƖf\*GG&7FG<*V,*''G2**FF*FW&\*<*&FVǜ*ss|*7&W<***6\*\*766FVL*vF*6WW,*6*d,*W&F2* *l*F<*B*RÓS\*7&W<*<*6FVL*fn( 7FF*ࣂs\*7&W<*l*L**F\*c^( c*D*6\*6FW,*Bc#,*7&W<**F\*s( sL*D*6\*6FW,*"3l*7&W<**F\*s( sL*D*6\*6FW,*c *7&W<**F\*( L*D*6\*6FW,*c,*7&W<**F\*R*D*6\*6FW,* **v\*>( #l***&6w&VL*&W'L*