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ter 4 - Best Management Practices for. Erosion and Sediment <br />conveyance system. Special areas should be designated for washing vehicles. These <br />areas should be located where the wash water will spread out and evaporate or infiltrate <br />directly into the ground, or where the runoff can be collected in a temporary holding or <br />seepage basin. Wash areas should have gravel bases to minimize mud generation. <br />M 7) Stora a of Construction Materials. Chemicals. Etc. <br />Sites where chemicals, cements, solvents, paints, or other potential water pollutants are to <br />,. be stored, should be isolated in areas where they will not cause runoff pollution. Toxic <br />chemicals and materials, such as pesticides, paints, and acids, should be stored according <br />to manufacturers' guidelines. Overuse should be avoided and great care should be taken <br />r s should never be washed in. or near flowing <br />to prevent accidental spillage. Container <br />streams or stormwater conveyance systems. Groundwater resources should be protected <br />from leaching by placing a plastic mat, tar paper, or other impervious materials on any <br />.. areas where toxic liquids are to be opened and stored. <br />8) Sanitary Facilities - <br />r <br />All construction sites should be provided with adequate sanitary facilities for workers <br />according to applicable health regulations. <br />r <br />9) Dust Control <br />., The use of calcium chloride, oils, or other chemical dust control agents on construction <br />roads should be avoided. Periodic watering of these areas is a preferred alternative. <br />M <br />10) Dewatering <br />Many improvements . such as underground utilities, foundations, and stormwater <br />management facilities require removal and disposal of water from excavations. A detailed <br />discussion of this practice follows in DEWATERING - Section 4.40. <br />4-5 <br />