JLUS Report sj_jlus_report_sm - Page 51

Aircraft Noise Contours Noise contours associated with the Dare County Range were developed by the Navy with input from Seymour Johnson AFB as part of the Range Air Installations Compatible Use Zones (RAICUZ) Study completed in 2007. The noise levels were calculated based on mission types and profiles (average altitude, average thrust setting, and average airspeed) and delivery profiles including dive bombing, level bombing, pop‐up delivery, and strafing. Tyrrell County Grapevine Marsh Sawyer Lake £¤ 64 Dare County Roanoke Marsh Because of low level flight associated with the DCR, the noise contours extend outside the DCR into Dare, Hyde and Tyrrell Counties at levels between 65 and 75 dB. There is one pocket over the Alligator River where the noise contours are between 70 and 75 dB. Overall, the DCR has a much lower sonic impact on its surrounding communities than Seymour Johnson AFB. The noise contours at the DCR are illustrated on Figure 19. Hyde County Hyde County Airport Back Lake ab 264 Dare County Range Lake muskeet Seymour Johnson AFB and Dare County Range JLUS Report Aircraft Noise Contours Noise contours associated with the Dare County Range  were developed by the Navy with input from  Seymour Johnson AFB as part of the Range Air  Installations Compatible Use Zones (RAICUZ) Study  completed in 2007.  The noise levels were calculated  based on mission types and profiles (average altitude,  average thrust setting, and average airspeed) and  delivery profiles including dive bombing, level bombing,  pop‐up delivery, and strafing.  Figure 19 £ ¤ 64 T S 345 Dare County Tyrrell County Roanoke Marsh Aircraft Noise Contours at Dare County Range Legend Sawyer Lake DNL Noise Contour (dB) 60 DNL 65 DNL 70 DNL 75 DNL Installation Boundary County Boundary Grapevine Marsh Stream / River Water Body Because of low level flight associated with the DCR, the  noise contours extend outside the DCR into Dare, Hyde  and Tyrrell Counties at levels between 65 and 75 dB.   There is one pocket over the Alligator River where the  noise contours are between 70 and 75 dB.  Overall, the  DCR has a much lower sonic impact on its surrounding  communities than Seymou ۰Q0p\p۝\]0p԰\p[\]Y0۰Y\p NK0[\ X\X“ZBTY^B]HY^BZ\ܝ\H[B[BBYB[BYH[BZ\ܝ\N[H[[YHYB\X\[ۜ[[ K MZBX][]\Y]^[[\ۈQ[\H[H[HT\ܝZ[\”YH