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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 Workshop Presentations: Inspecting Construction of Permanent Stormwater Treatment Measures (March 19 and 20 2008) Fact Sheet: 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 include New Development and Construction) "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). | | | 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. | Regional Board letter re: acceptable treatment measures
ACCWP Technical Guidance for Specific Treatment Measures (from Chapter 6 of the C.3 Stormwater Technical Guidance) NEW! Soil Specifications for Stormwater Treatment Measures NEW! Stormwater Treatment Measure Construction Phase Inspection Checklists NEW! 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. |
| 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. |
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To contact a new development municipal program representative, see contact list Last updated 6/12/08
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