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TC-2 Stabilized Construction Roadway <br /> ■ Certain chemical stabilization methods may cause stormwater or soil pollution and should <br /> not be used. See WE-i,Wind Erosion Control. <br /> ■ Management of construction traffic is subject to air quality control measures. Contact the <br /> local air quality management agency. <br /> ■ Materials will likely need to be removed prior to final project grading and stabilization. <br /> ■ Use of this BMP may not be applicable to very short duration projects. <br /> Implementation <br /> General <br /> Areas that are graded for construction vehicle transport and parking purposes are especially <br /> susceptible to erosion and dust. The exposed soil surface is continually disturbed,leaving no <br /> opportunity for vegetative stabilization. Such areas also tend to collect and transport runoff <br /> waters along their surfaces. During wet weather,they often become muddy quagmires that <br /> generate significant quantities of sediment that may pollute nearby streams or be transported <br /> offsite on the wheels of construction vehicles. Dirt roads can become so unstable during wet <br /> weather that they are virtually unusable. <br /> Efficient construction road stabilization not only reduces onsite erosion but also can <br /> significantly speed onsite work, avoid instances of immobilized machinery and delivery vehicles, <br /> and generally improve site efficiency and workingconditions during adverse weather <br /> Installation/Application Criteria <br /> Permanent roads and parking areas should be paved as soon as possible after grading. As an <br /> alternative where construction will be phased,the early application of gravel or chemical <br /> stabilization may solve potential erosion and stability problems. Temporary gravel roadway <br /> should be considered during the rainy season and on slopes greater than 5%. <br /> Temporary roads should follow the contour of the natural terrain to the maximum extent <br /> possible. Slope should not exceed 15%. Roadways should be carefully graded to drain <br /> transversely. Provide drainage swales on each side of the roadway in the case of a crowned <br /> section or one side in the case of a super elevated section. Simple gravel berms without a trench <br /> can also be used. <br /> Installed inlets should be protected to prevent sediment laden water from entering the storm <br /> sewer system (SE-1o, Storm Drain Inlet Protection). In addition,the following criteria should <br /> be considered. <br /> ■ Road should follow topographic contours to reduce erosion of the roadway. <br /> ■ The roadway slope should not exceed 15%. <br /> ■ Chemical stabilizers or water are usually required on gravel or dirt roads to prevent dust <br /> (WE-i,Wind Erosion Control). <br /> ■ Properly grade roadway to prevent runoff from leaving the construction site. <br /> ■ Design stabilized access to support heaviest vehicles and equipment that will use it. <br /> 2 of 4 California Stormwater BMP Handbook January 2003 <br /> Construction <br /> www.cabmphandbooks.com <br />