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SD-34 Outdoor Material Storage Areas <br />for material storage areas are governed by Building and Fire Codes, and by current City or <br />County ordinances and zoning requirements. Control measures are site specific, and must meet <br />local agency requirements. <br />Designing New Installations <br />Where proposed project plans include outdoor areas for storage of materials that may contribute <br />pollutants to the stormwater conveyance system, the following structural or treatment BMPS <br />should be considered: <br />■ Materials with the potential to contaminate stormwater should be: (i) placed in an enclosure <br />such as, but not limited to, a cabinet, shed, or similar structure that prevents contact with <br />runoff or spillage to the stormwater conveyance system, or (z) protected by secondary <br />containment structures such as berms, dikes, or curbs. <br />■ The storage area should be paved and sufficiently impervious to contain leaks and spills. <br />■ The storage area should slope towards a dead-end sump to contain spills and direct runoff <br />from downspouts/roofs should be directed away from storage areas. <br />■ The storage area should have a roof or awning that extends beyond the storage area to <br />minimize collection of stormwater within the secondary containment area. A manufactured <br />storage shed may be used for small containers. <br />Note that the locations) of installations of where these preventative measures will be employed <br />must be included on the map or plans identifying BMPs. <br />Redeveloping Existing Installations <br />Various jurisdictional stormwater management and mitigation plans (SUSMP, WQMP, etc.) <br />define "redevelopment" in terms of amounts of additional impervious area, increases in gross <br />floor area and/or exterior construction, and land disturbing activities with structural or <br />impervious surfaces. The definition of" redevelopment" must be consulted to determine <br />whether or not the requirements for new development apply to areas intended for <br />redevelopment. If the definition applies, the steps outlined under "designing new installations" <br />above should be followed <br />Additional Information <br />Stormwater and non-stormwater will accumulate in containment areas and sumps with <br />impervious surfaces. Contaminated accumulated water must be disposed of in accordance with <br />applicable laws and cannot be discharged directly to the storm drain or sanitary sewer system <br />without the appropriate permits. <br />Other Resources <br />A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County <br />Department of Public Works, May zooz. <br />Model Standard Urban Storm Water Mitigation Plan (SUSMP) for San Diego County, Port of <br />San Diego, and Cities in San Diego County, February 14, zooz. <br />2 of 3 California Stormwater BMP Handbook January 2003 <br />New Development and Redevelopment <br />www.cabmphandbooks.com <br />