SBCT Final EIS - Govsupport.us

Chapter 5 – Environmental Consequences5.5.3.1 Hawaii5.5.3.1.1 Impacts from Cantonment ConstructionNo ImpactsSome non-Stryker construction such as barracks renovations and maintenance activities would occuras planned. No impacts to water resources would be anticipated from cantonment construction.5.5.3.1.2 Impacts from Range ConstructionLess Than Significant ImpactsImpacts on surface water quality. No Range Construction would take place as part of this alternative.Range maintenance activities of existing ranges, such as targetry replacement, stream crossings, andtrail maintenance would continue. These activities could potentially impact waters of the U.S. via thecrossings of streams.Nonpoint source pollution. Range maintenance activities may result in increased sediment loading ofstormwater runoff and could degrade water quality in receiving streams. The potential for theoccurrence of these impacts would be minimized by implementing standard construction BMPs forrunoff control.Chemical spills or nonpoint source discharges. Vehicles would transport equipment and suppliesalong existing roads and trails. Operating vehicles at safe speeds would minimize the potential forspills or releases. Because accidents cannot be ruled out, there is a small potential for spills ofpetroleum products or other transported substances. The impact on surface water quality would below because appropriate spill response equipment would be carried with any vehicles transportingchemical or petroleum products, and trained response personnel would be immediately dispatched tothe spill site to begin cleanup, according to standard spill response procedures.Use of dust control palliatives. Controlling dust using calcium or magnesium chloride, calciumlignosulfonates, or other materials or measures could affect surface water quality, either by increasingthe biological oxygen demand or by increasing total dissolved solids concentrations. These impactsare expected to be less than significant because the chemicals would be applied according to industrystandards (Parametrix 2001).5.5.3.1.3 Impacts from Live-fire TrainingLess Than Significant ImpactsNonpoint source contamination of surface water. Training activities have resulted in soilcontamination at firing points and ranges within the boundaries of the PTA. Based on the results ofrecent soil sampling at the PTA, the most significant explosive constituent found in soils was RDX.Several metals, including iron and aluminum, occur naturally at concentrations above USEPA PRGsfor soils. The concentrations of some other metals, including zinc and lead (which were found abovesoil PRGs), may be attributable in part to training activities.No surface water samples have been collected at PTA and there are no perennial streams, so theultimate result of the interaction of chemicals in soils with intermittent surface water runoff would betransport of the chemicals with the intermittent stream flows and sediment and deposition downslope.The ORAP program of monitoring surface water quality would continue. Potential impacts on surfaceFebruary 2008 5-200 2/25th SBCT Final EIS