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Chapter 4-Site-Spec /n&a/ Storm Water BMPs <br />that may have pollutants. <br />to treatment facilities. <br />The grading should also contain the contaminated flows or divert them <br />When regrading and paving an industrial area, the use of concrete paving instead of asphalt should <br />be considered. This is especially important in potential spill sites or hazardous material storage <br />areas. Asphalt absorbs organic pollutants and can be slowly dissolved by some fluids, thus <br />becoming a possible source of contaminants itself. This control measure should be used with a <br />cover, such as a roof, in areas where contaminants are of concern (see Covering BMP) so that rain <br />or snow does not fall on the area and wash the contaminants down slope. <br />Inspect paving regularly for cracks that may allow contaminants to seep into the ground. Also, <br />check to make sure that the drains receiving the storm water flow from the paved area remain <br />unclogged with sediment or other debris so that low areas do not flood and wash over the areas <br />where the contaminants may be. <br />Advantages of Graded Areas and Pavement <br />• Is effective in limiting storm water contact with contaminants <br />• Is relatively inexpensive and easily implemented <br />Disadvantages of Graded Areas and Pavement <br />• May be uneconomical to regrade and resurface large areas <br />• May not be effective during heavy precipitation <br />• <br />• <br />• <br />4-10