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Water Resources <br />^ Frequently inspect filter fabric screens (or straw bales) at storm drain <br />inlets to ensure that they do not clog, causing silt-laden water to run down <br />to an adjacent, unprotected drain. <br />^ Regulazly inspect and clean catch basins neaz the work area to ensure that <br />they do not become filled with sediments or debris and that conveyance <br />restrictions do not occur. <br />^ Construct runoff collection and conveyance facilities to route sediment- <br />laden flows into a stormwater treatment system (such as a settling tank), to <br />reduce suspended solids transport offsite. If dewatering is required, <br />monitor the water quality of pumped discharges regularly to determine <br />whether dewatering flows require treatment prior to offsite discharge. <br />^ Regulazly inspect and clean sediment retention facilities to ensure that <br />they do not fill with sediment and become ineffective during high-flow <br />conditions. <br />^ Stabilize construction access roads and staging azeas with quarry spalls, <br />crushed gravel, or similar material, and wash vehicle tires prior to <br />departure from the site at all times. Route the tire washwater to other <br />runoff control facilities on the site to enable trapping of sediments. <br />^ Use ground covers such as mulch or hydroseeding. <br />• Cover material stockpiles when they are not in use. <br />^ Restrict construction activities to periods of low rainfall (May through <br />September) to minimize the potential for erosion and adverse water quality <br />impacts offsite, and to reduce the need for dewatering . <br />The following additional best management practices (BMPs) for control of pollution could be <br />considered for all sites: <br />^ Stock spill cleanup materials in designated areas to enable rapid response <br />to leaks and spills of fuel, oil, or other engine fluids. Equipment fueling <br />and washing should occur only in these designated azeas, and the areas <br />should drain to sediment retention facilities so that spill containment <br />capacity is provided. <br />^ Store containers for fuel, oil, solvents, paints, and other toxic fluids in a <br />covered, marked location. <br />Provide designated disposal facilities (sepazately) for waste oil, ordinary <br />gazbage, and contaminated materials. These locations should be clearly <br />signed so that construction personnel are encouraged to use them at all <br />times. <br />Final EIS 52 New Federal Courthouse <br />