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Chapter 4-Site-Specific /nasiai Storm Water BMPs . <br />i <br />k <br />Di <br />`t <br />What Is k <br />Containment dikes are temporary or permanent earth or concrete berms or retaining walls that are <br />designed to hold spills. Diking, one of the most common types of containment, is an effective <br />method of pollution prevention for above-ground liquid storage tanks and rail car or tank truck <br />loading and unloading areas. Diking can provide one of the best protective measures against the <br />contamination of storm water because it surrounds the area of concern and holds the spill, keeping <br />spill materials separated from the storm water outside of the diked area. <br />I <br />Dike equal to 10% of total tank Impervious surface - Permanently installed tanks <br />volume or 110% of largest tank surrounded by dike system <br />Containment Diking for Large Storage Areas <br /> <br />Containment Diking for Small Storage Areas <br />FIGURE 4.4 CONTAINMENT DIKING <br />(Modified from MWCOG, 1992) <br />When and Where to Use It <br />Diking can be used at any industrial facility but is most commonly used for controlling large spills or <br />releases from liquid storage areas and liquid transfer areas. <br />• <br />[What to Consider <br />Containment dikes should be large enough to hold an amount equal to the largest single storage <br />tank at the particular facility plus the volume of rainfall. For rail car and tank truck loading and <br />unloading operations, the diked area should be capable of holding an amount equal to any single <br />4-12