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CONTACT
County Stormwater Program (805) 662-6737

Public Counter Government Center
Hall of Administration, Main Plaza
8:00 a.m.- 5:00 p.m. (805) 654-2069

Guidelines / Standards

For new Development/Redevelopment Projects
Deemed complete after October 11, 2011

If the proposed project meets New Development and Redevelopment criteria and was deemed complete after October 11, 2011, it shall meet the requirements of Subpart 4.E "Planning and land Development Program" of the 2010 Ventura Countywide Stormwater Municipal Permit (Order No. R4-2010-0108).

The following questionnaire and flow chart will help you determine if your proposed project meet criteria of New Development or Redevelopment project:

The following guidelines will help you meet design requirements for the post-construction stormwater controls:

For new Development/Redevelopment Projects
Deemed complete prior to October 11, 2011

If your proposed project meets New Development or Redevelopment criteria of the
2000 Ventura County Municipal Stormwater Permit for the created, added, or replaced impervious or total surface area, the proposed design must incorporate stormwater permit requirements, including post-construction controls to mitigate stormwater pollution.

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
  • A completed, project-specific
    Stormwater Quality Impact Mitigation Plan (SQUIMP) Worksheet.

Construction

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
  • For projects greater than 5 acres of soil disturbances, refer to Table 6 , Table 7 , and Table 8 of the Permit.

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 activity includes 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.

Commercial Business

If your proposed project is subject to the commercial business category , then the facility will be required to implement Best Management Practices (BMPs) under the 2010 Ventura County Stormwater Municipal Permit (Order No. R4-2010-0108).

Others

If your proposed project is determined to have impact on surface water quality or stormwater runoff, additional water quality mitigation measures will apply.