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Chapter 4 - Best Management Practices for Erosion and Sediment Control Vehicles such as cement or dump trucks and other construction equipment should not be washed at locations where the runoff will flow directly into a watercourse or stormwater conveyance system . Special areas should be designated forwashing vehicles . These areas should be located where the wash water will spread out and evaporate or infiltrate directly into the ground , or where the runoff can be collected in a temporary holding or seepage basin . Wash areas should have gravel bases to minimize mud generation . 7 ) Storage of Construction Materials , Chemicals . Etc. Sites where chemicals, cements , solvents, paints , or other potential water pollutants are to be stored , should be isolated in areas where they will not cause runoff pollution . Toxic chemicals and materials , such as pesticides , paints , and acids , should be stored according to manufacturers' guidelines . Overuse should be avoided and great care should be taken to .� prevent accidental spillage . Containers should never be washed in or near flowing streams or stormwater conveyance systems. Groundwater resources should be protected from leaching by placing a plastic mat, tar paper, or other impervious materials on any areas where .. toxic liquids are to be opened and stored . 8 ) Sanitary Facilities •+ All construction sites should be provided with adequate sanitary facilities for workers according to applicable health regulations . r 9) Dust Control The use of calcium chloride , oils , or other chemical dust control agents on construction roads should be avoided . Periodic watering of these areas is a preferred alternative . 10 ) Dewatering Many improvements such as underground utilities , foundations, and stormwater management facilities require removal and disposal of water from excavations . A detailed discussion of this practice follows in DEWATERING - Section 4 .40 . ■ 4-5