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Outdoor Material Storage Areas SD-34 <br />Design Objectives <br />Maximize Infiltration <br />Provide Retention <br />J <br />- <br />Slow Runoff <br />Minimize Impervious Land <br />Coverage <br />Prohibit Dumping of Improper <br />Materials <br />`� `�� <br />✓ Contain Pollutant <br />Collect and Convey <br />Description <br />Proper design of outdoor storage areas for materials reduces opportunity for toxic compounds, <br />oil and grease, heavy metals, nutrients, suspended solids, and other pollutants to enter the <br />stormwater conveyance system. Materials may be in the form of raw products, by-products, <br />finished products, and waste products. The type of pollutants associated with the materials will <br />vary depending on the type of commercial or industrial activity. <br />Approach <br />Outdoor storage areas require a drainage approach different from the typical <br />infiltration/detention strategy. In outdoor storage areas, infiltration is discouraged. <br />Containment is encouraged. Preventative measures include enclosures, secondary containment <br />structures and impervious surfaces. <br />Suitable Applications <br />Appropriate applications include residential, commercial and industrial areas planned for <br />development or redevelopment. <br />Design Considerations <br />Some materials are more of a concern than others. Toxic and hazardous materials must be <br />prevented from coming in contact with stormwater. Non -toxic or non -hazardous materials do <br />not have to be prevented from stormwater contact. However, these materials may have toxic <br />effects on receiving waters if allowed to be discharged with stormwater in significant quantities. <br />Accumulated material on an impervious surface could result in significant impact on the rivers <br />or streams that receive the runoff. <br />Material may be stored in a variety of ways, including bulk piles, <br />containers, shelving, stacking, and tanks. Stormwater <br />contamination may be prevented by eliminating the possibility of r. A S a A <br />stormwater contact with the material storage areas either through Callfornla <br />diversion, cover, or capture of the stormwater. Control measures na""'aa <br />may also include minimizing the storage area. Design requirements cuaINY <br />AssodaWn <br />January 2003 California Stormwater BMP Handbook 1 of 3 <br />New Development and Redevelopment <br />www.cabmphandbooks.com <br />