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Drainage System Maintenance SC-44 <br />Description <br />As a consequence of its function, the stormwater conveyance <br />system collects and transports urban runoff and stormwater that <br />may contain certain pollutants. The protocols in this fact sheet <br />are intended to reduce pollutants reaching receiving waters <br />through proper conveyance system operation and maintenance. <br />Approach <br />Pollution Preoention <br />Maintain catch basins, stormwater inlets, and other stormwater <br />conveyance structures on a regular basis to remove pollutants, <br />reduce high pollutant concentrations during the first flush of <br />storms, prevent clogging of the downstream conveyance system, <br />restore catch basins' sediment trapping capacity, and ensure the <br />system functions properly hydraulically to avoid flooding. <br />Suggested Protocols <br />Catch Basins/Inlet Structures <br />• Staff should regularly inspect facilities to ensure compliance <br />with the following: <br />Immediate repair of any deterioration threatening <br />structural integrity. <br />Cleaning before the sump is 40% full. Catch basins <br />should be cleaned as frequently as needed to meet this <br />standard. <br />Stenciling of catch basins and inlets (see SC34 Waste <br />Handling and Disposal). <br />Objectives <br />• Cover <br />• Contain <br />• Educate <br />• Reduce/Minimize <br />Targeted Constituents <br />Sediment <br />✓ <br />Nutrients <br />Trash <br />✓ <br />Metals <br />Bacteria <br />✓ <br />Oil and Grease <br />Organics <br />CASOA <br />MEEK- <br />Allsoclation <br />January 2003 California Stormwater BMP Handbook 1 of 6 <br />Industrial and Commercial <br />wwwcabmphandbooks com <br />