SBCT Final EIS - Govsupport.us

Chapter 5 – Environmental ConsequencesThus, overall impacts of maneuver training to air quality would remain the same and would be lessthan significant.5.5.12 NoiseTable 5-63 lists the types of impacts associated with noise that would occur under Alternative D.Under the No Action Alternative, the 2/25 th SBCT would not be stationed at any of the alternativelocations, and therefore no SBCT-specific impacts to noise would occur. Impacts are described belowfor each location.Table 5-63 Summary of Potential Impacts to Noise from Alternative DLocationHawaii Alaska ColoradoKTA/Activity Group SBMR DMR KLOA PTA FRA DTA FTC PCMSImpacts from CantonmentConstruction☼ N/A N/A N/A N/A ☼ N/AImpacts from RangeConstruction Impacts from Live-FireTraining ☼ ☼ ☼ ☼ ☼ ☼ Impacts from ManeuverTraining☼ ☼ ☼ ☼ ☼ ☼ ☼ ☼ = Significant + = Beneficial Impact = Significant but mitigable to less than significant N/A = Not Applicable☼ = Less than Significant= No Impact5.5.12.1 Hawaii5.5.12.1.1 Impacts from Cantonment ConstructionLess Than Significant ImpactsLimited cantonment construction and ongoing renovation would occur under Alternative D.Construction may occur at SBMR on as needed basis in the future.Construction projects would temporarily increase human presence and activity at construction sites.Individual items of construction equipment typically generate noise levels of 80 to 90 dBA at adistance of 50 feet. With multiple items of equipment operating concurrently, noise levels can berelatively high during the day at locations within several hundred feet of active construction sites. Thezone of relatively high construction noise levels typically extends to distances of 400 to 800 feet fromthe site of major equipment operations. Locations more than 1,000 feet from construction sitesseldom experience significant levels of construction noise.Construction activities would generate average daytime noise levels of about 55 dBA at the closestnoise-sensitive area. Because incremental Ldn contributions from construction activities would belower than 65 dBA at the nearest noise-sensitive areas (1,950 feet distant), impacts from constructionnoise would be less than significant. Most other construction projects would be further removed fromnoise-sensitive locations than the projects discussed above. Noise effects from these projects wouldFebruary 2008 5-233 2/25th SBCT Final EIS