SBCT Final EIS - Govsupport.us

Chapter 5 – Environmental Consequencescontamination of surface water and shallow groundwater during operation of facilities at the trainingranges. These impacts would be significant but mitigable to less than significant. Continually fundedmitigation measures would minimize these affects to less than significant levels. Impacts to surfacewater or groundwater from maneuver training at PTA, as well as impacts to water quality from spillsor nonpoint source discharges, and impacts on flood potential at DMR are considered less thansignificant (Table 5-4).Table 5-4Summary of Potential Water Resource Impacts from Alternative ALocationActivity Group SBMR DMR KTA/KLOA PTAImpacts from Cantonment Construction N/A N/A N/A N/AImpacts from Range Construction N/A Impacts from Live-Fire Training N/A ☼Impacts from Maneuver Training ☼ = Significant + = Beneficial Impact = Significant but mitigable to less than significant N/A = Not Applicable☼ = Less than Significant= No Impact5.2.3.1 Impacts from Cantonment ConstructionThere is no cantonment construction required in USAG-HI to support the stationing of the 2/25 th .USAG-HI has adequate facilities on hand to support the SBCT and, in fact, was supporting theSBCT’s living, administrative, and vehicle maintenance requirements in 2007 prior to the unit’sdeployment.5.2.3.2 Impacts from Range ConstructionSignificant Impacts Mitigable to Less Than SignificantImpact 1: Nonpoint source contamination of surface water. During construction, surface waterquality may be affected by stormwater runoff coming into contact with disturbed soil or withcontaminants from accidental spills. The resulting stormwater runoff could carry sediments orcontaminants to adjacent waterways. Drainage from proposed construction sites could have a highpotential to affect water quality in either the Kaukonahua Stream, north of the SBMR boundary, orthe Waikele Stream, south of the installation boundary. Majority of the proposed BAX area is locatedwithin the Mohiakea Gulch drainage, a tributary of Kaukonahua Stream. The Motor PoolMaintenance Shops is about 60 percent constructed and located within the watershed of WaikeleStream.Regulatory and Administrative Mitigation 1: Implementing Phase II Stormwater ManagementRegulations of the Clean Water Act, the ITAM, and IWFMP as described below would reducenonpoint source contamination of surface water to less than significant.The ITAM program would continue to identify and inventory land condition, coordinating betweentraining planners and natural resource managers, implementing land rehabilitation measures identifiedin the INRMP, monitoring the effectiveness of the land rehabilitation measures, evaluating erosionFebruary 2008 5-17 2/25th SBCT Final EIS