U.S. EPA Managing Wet Weather with Green Infrastructure This document contains guidelines for post-construction controls to mitigate stormwater pollution. The green infrastructure management includes approaches and technologies to infiltrate, evapotranspire, capture and reuse stormwater to maintain or restore natural hydrological conditions.
U.S. EPA Low Impact Development This document contains information related to Low Impact Development including fact sheets, reports, design manuals, guidance manuals, and information resources.
For new Development/Redevelopment Projects Deemed complete prior to October 11, 2011
The new development and redevelopment project criteria are summarized in the 2000 F.8 "Surface Water Quality" Section. If your proposed project meets one of the criteria, then your Discretionary Permit application submittal must also include:
Location of proposed post-construction control features and devices on your site/grading plan;
Appropriate design calculations and analysis in your Drainage Study/Hydrology Report to demonstrate that the post-construction controls will function as proposed using the applicable Design Procedure Form (Appendix G of the 2002 Technical Guidance Manual ); and
If your proposed project causes any soil disturbance during construction or demolition activities, then the effective combination of Best Management Practices (BMPs) prescribed by the 2010 Ventura County Stormwater Municipal Permit (Order No. R4-2010-0108) will be required as follows:
For projects less than 1 acre of soil disturbance, refer to Table 6 of the Permit;
For projects 1 acre or greater but less than 5 acres of soil disturbance, refer to Table 6 and Table 7 of the Permit; and
If you proposed project meets one of the following criteria, then implementation of the enhanced BMPs at High Risk Sites, which are listed in Table 9 of the Permit, will be required for:
All construction sites on hillsides (greater than 20% slope); and
Construction sites that directly discharge to a waterbody listed on the Clean Water Act 303 (d) list for siltation or sediment; or
Construction activities that occur within or directly adjacent to an Environmentally Sensitive Area (ESAs), refer to Figure 1.
In addition, construction activity resulting in a land disturbance of one acre or more, or less than one acre but part of a larger common plan of development or sale, shall obtain and comply with the State Construction Activities Storm Water General Permit for Discharges of Storm Water Runoff Associated with Construction Activities.
Definitions: Construction activityincludes any construction or demolition activity, clearing, grading, grubbing, or excavation or any other activity that results in a land disturbance.
Construction activity does not include
Emergency construction activities required to immediately protect public health and safety or
Routine maintenance activities required to maintain the integrity of structures by performing minor repair and restoration work, maintain original line and grade, hydraulic capacity, or original purpose of the facility.
Industrial Facilities
If your proposed project meets industrial applicability criteria, then the facility is required to apply for and comply with the State Industrial Activity Stormwater General Permit No. CAS000001 for Discharges of Storm Water Runoff Associated with Industrial Activities.
The State Water Board is in the process of developing a new State Industrial Activity Stormwater General Permit No. CAS000001. Anticipated for adoption in early 2012.
If your proposed project is determined to have impact on surface water quality or stormwater runoff, additional water quality mitigation measures will apply.
. If your proposed project meets one of the criteria, then your Discretionary Permit application submittal must also include:
of the Permit;