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• Chapter 4-Site-Specit industria/ Storm Water BN,Ps <br />• <br />• <br />(.: Vehicle Washing <br />What Is It <br />Materials that accumulate on vehicles and then scatter across industrial sites represent an <br />important source of storm water contamination. Vehicle washing removes materials such as site- <br />specific dust and spilled materials that have accumulated on the vehicle. If not removed, residual <br />material will be spread by gravity, wind, snow, or rainfall as the vehicles move across the facility <br />site and off the site. <br />When and Where to Use It <br />This practice is appropriate for any facility where vehicles come into contact with raw materials on <br />a site. If possible, the vehicle washing area should be built near the location where the most <br />vehicle activity occurs. Wastewater from vehicle washing should be directed away from process <br />materials to prevent contact. Those areas include material transfer areas, loading and unloading <br />areas, or areas located just before the site exit. <br />What to Consider <br />When considering the method of vehicle washing, the facility should consider using a high-pressure <br />• water spray with no detergent additives. In general, water will adequately remove contaminants <br />from the vehicle. If detergents are used, they may cause other environmental impacts. Phosphate- <br />or organic-containing compounds should be avoided. <br />4-49