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New Development and RedevelopmentFor developers, contractors, builders or anyone considering a construction or redevelopment project on their property:Urban development is a major contributor to stormwater-caused pollution. Requirements for new development and re-development projects fall in several categories, defined in section C.3 of ACCWP's permit. For each, links are shown for resources by ACCWP and other organizations NOTE: The new Municipal Regional Stormwater Permit (MRP) became effective Dec. 1, 2009. While many engineering aspects of C.3 requirements are unchanged, there are differences in site planning approaches and potential exemption status of proposed projects. Please contact ACCWP or local new development representatives for status of updates to existing guidance. For more information, view the flyer on New Additional Low Impact Development Requirements Phasing In. Workshop Presentations: Inspecting Construction of Permanent Stormwater Treatment Measures (March 19 and 20 2008) Fact Sheet: Changes to Stormwater Quality Requirements for Developers, Builders and Project Proponents Topics (scroll down to view)General References Controls During Construction Post-construction Controls - Source Controls and Site Design
- Treatment Controls
- Hydromodification Management
Other Links
General References
California Stormwater Best Management Practice Handbooks (4 volumes published in 2003 include New Development and Construction) New! Web Portal to the 2009 Version of the Construction BMP Handbook "Implementing C.3 Stormwater Requirements" - February 13, 2007 Workshop Presentations | ACCWP C3 Technical Guidance (for developers, builders and project applicants) | 
Stormwater Treatment Swale at Airway Business Park on Lindbergh Avenue, Livermore, CA
| Topics | Resource Links | | Controls During Construction |
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Projects disturbing more than one acre of surface, or less than an acre but part of a larger plan of development or sale, are required to file with the State of California. See Frequently Asked Questions (FAQs) for more information. "Disturb" refers to grading clearing (removal of vegetation), excavation, stockpiling, storage of machinery, and/or replacement of paved or impervious areas. Projects less than an acre need to protect the site from erosion and sediment loss and other potential sources of water pollution resulting from construction by incorporating construction controls using Best Management Practices (BMPs). The State Water Resources Control Board recently adopted a revised Construction General Permit which will take effect July 1, 2010. This permit will involve significant new requirements. Â Read the fact sheet about the new permit or see all provisions, | | | Post-Construction Controls |
| TREATMENT CONTROLS Treatment controls - Treatment controls are the facilities that are to designed and installed to remove pollutants from stormwater before the stormwater reaches the public drainage system or the creek. Typical measures are bio- retention areas, vegetated swales, and infiltration trenches. Projects creating or replacing 10,000 square feet of impervious surface are required to design the treatment control for a specific flow rate. New, additional requirements for low impact development go into effect December 1, 2011, and may affect projects currently under review. Click here for more information. | New! Additional Low Impact Development Requirements Phasing In Regional Board letter re: acceptable treatment measures
ACCWP Technical Guidance for Specific Treatment Measures (from Chapter 6 of the C.3 Stormwater Technical Guidance) Soil Specifications for Stormwater Treatment Measures Stormwater Treatment Measure Construction Phase Inspection Checklists Templates for preparing Treatment Measure Maintenance Plans | SOURCE CONTROLS Source control features - Source control features are designed to keep pollution away from stormwater. They include trash areas that are enclosed, covered and plumbed to drain to the sanitary sewer system and designated wash areas that are plumbed to the sanitary sewer system, covered car wash areas that are plumbed to the sanitary sewer system. Most business establishments and certain residential developments are required to install source control features. |
- Contact local
jurisdiction to ask for the municipality - specific source control list.
| SITE DESIGN Site design features include reducing impervious areas, increasing pervious areas utilizing landscaped areas in between impervious areas as a storm drainage treatment feature. All projects are to consider implementing site design features appropriate to the development. |
| HYDROMODIFICATION MANAGEMENT (HM) Hydrograph Modification Management, also called Hydromodification Management or HM, ensures that runoff from developed areas matches flow durations (long-term temporal patterns of volume and rate) of the pre-project runoff. All projects are to consider HM on the site through site design features. Projects creating or replacing one acre or more of impervious surface and located in HM control areas are also required to implement the HM Standard for flow duration control starting June 12, 2007. On-site flow duration control involves detaining increased runoff and discharging the detained volume through a special outlet structure, which may be sized using the Bay Area Hydrology Model (BAHM), a software tool specifically designed for this purpose. |
| Other Links |
To contact a new development municipal program representative, see contact list Last updated 8/23/2010
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