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Storm Drain Signage SD-13 <br />Design Objectives <br />Maximize Infiltration <br />Provide Retention <br />Slow Runoff <br />Minimize Impervious Land <br />Coverage <br />0 Prohibit Dumping of Improper <br />Materials <br />Contain Pollutants <br />Collect and Convey <br />Description <br />Waste materials dumped into storm drain inlets can have severe impacts on receiving and <br />ground waters. Posting notices regarding discharge prohibitions at storm drain inlets can <br />prevent waste dumping. Storm drain signs and stencils are highly visible source controls that <br />are typically placed directly adjacent to storm drain inlets. <br />Approach <br />The stencil or affixed sign contains a brief statement that prohibits dumping of improper <br />materials into the urban runoff conveyance system. Storm drain messages have become a <br />popular method of alerting the public about the effects of and the prohibitions against waste <br />disposal. <br />Suitable Applications <br />Stencils and signs alert the public to the destination of pollutants discharged to the storm drain. <br />Signs are appropriate in residential, commercial, and industrial areas, as well as any other area <br />where contributions or dumping to storm drains is likely. <br />Design Considerations <br />Storm drain message markers or placards are recommended at all storm drain inlets within the <br />boundary of a development project. The marker should be placed in clear sight facing toward <br />anyone approaching the inlet from either side. All storm drain inlet locations should be <br />identified on the development site map. <br />Designing New Installations <br />The following methods should be considered for inclusion in the <br />project design and show on project plans: <br />■ Provide stenciling or labeling of all storm drain inlets and <br />catch basins, constructed or modified, within the project area <br />with prohibitive language. Examples include "NO DUMPING <br />CALFORn1A5 ORNv ATER <br />January 2003 California Stormwater BMP Handbook 1 of 2 <br />New Development and Redevelopment <br />www.cabmphandbooks.com <br />