New Stormwater Regulations

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New Stormwater Regulations

• C.3 Provisions in effect Feb. 15, 2005

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Protecting Water Quality

1. Why managing stormwater is important.
2. What we are doing now.
3. How new development affects water quality.
4. How the new regulations will be implemented.

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What is a watershed?
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Managing Stormwater Runoff

• Preventing Stormwater Pollution
• Toxic pollutants like mercury and PCBs
• Sediment, oil and grease
• Household pesticides and detergents

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Managing Stormwater Runoff

• Preventing Stormwater Pollution
• Toxic pollutants like mercury and PCBs
• Sediment, oil and grease
• Household pesticides and detergents
• Quantity and timing of runoff
• Paved, impervious roofs, parking, and streets
• Increased volume of flow and peak flow rate.

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Who is involved?

• Stormwater management activities are coordinated
  throughout City departments.
• City participates in and cooperates with the
  Contra Costa Clean Water Program.
• CCCWP includes 18 other Contra Costa cities and
  towns, Contra Costa County, and the Flood Control
  District .
• Oversight by the California Regional Water
  Quality Control Board (SF Bay Region).

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What the City is Doing Now

• Complies with storm water discharge permit.
• Inspects businesses.
• Minimizes pollutants from City activities.
• Contributes to monitoring pollution-
  prevention studies.
• Conducts outreach and education.

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Municipal Stormwater NPDES Permit History

• 1994 First countywide permit issued. Focus on
  public outreach and education.
• 1999 Permit revised, added performance standards
  for implementation
• February 2002 Revised Permit Provision C.3.
  (New and Redevelopment Requirements)

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Effects of New Development
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Runoff Before Development
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Runoff After Development
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Effects of increased runoff

• Increased flows and more frequent flooding leads
  to
• Increased streambank erosion, which leads to
• Hardening to prevent erosion, which leads to

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Loss of Stream Functions
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Solutions

• Design areas that allow runoff to infiltrate into
  soil.
• Use pervious paving.
• Integrate shallow detention basins into
  landscaping.
• Use narrower streets minimize impervious surface
  area.

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Solutions
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Vegetated (Dry) Swale
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New Regulations for Development and Redevelopment

• Provision C.3. Requirements
• Projects (public private) must detain or treat
  runoff on site.
• Projects with 1 acre or more impervious surface
  approved after February 15, 2005
• Projects with 10,000 square feet or more
  impervious surface approved after Oct. 2006
• Mandated design criteria for volume and flow

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• Cities, towns County must
• Estimate and control future increases in peak
  runoff
• Verify that on-site treatment devices are
  maintained
• Update conditions of approval, design standards,
  General Plans, environmental review processes

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Contra Costas Approach
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Preparations for C.3

• Update to Model Stormwater Ordinance
• Stormwater C.3 Guidebook
• Require a Stormwater Control Plan for planning
  and zoning review
• Show how drainage from site will be routed
  through treatment facilities
• Memos on technical and policy issues
• Workshops for staff and applicants

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C.3 Development Review
Pre-Application Meeting
Completed Application
Deemed Complete
Section Review
Conditions of Approval
Planning Commission
CEQA Review
Detailed Design
Plan Check
Permits to Build
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Stormwater C.3 Compliance
Section staff may review Stormwater Control Plan
along with site, grading, landscaping and other
plans
Pre-Application Meeting
Completed Application
Deemed Complete
Does applicants Stormwater Control Plan address
all reqts?
Staff identifies general C.3 requirements
Section Review
Conditions of Approval
Planning Commission
CEQA Review
Stormwater Control Plan is attached to COAs
Detailed Design
Plan Check
Permits to Build
Staff reviews implementation of Plan in drawings
specs
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Operation Maintenance
General descriptionof OM requirements
Detailed description and maintenance plan for
each facility
Certification of inspection continued
operation
Stormwater Control Plan
Stormwater Facilities Operation Maintenance
Plan
Stormwater Facilities Compliance Certificate
Submitted with Planning Zoning Application
Draft submitted with construction documents
Renewedeachyear
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Stormwater Control Plan Contents

• Project Setting
• Measures to Limit Imperviousness
• Selection Design of Treatment BMPs
• Source Control Measures
• Permitting and Code Compliance
• BMP Maintenance
• Construction Plan C.3 Checklist
• Certification

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More Information

• Quick Summary
• Stormwater Quality Control for Development
  Projects (2-page fact sheet)
• Summary of Project Review Process
• Stormwater C.3 Regulations Fact Sheet (4 pages
  includes checklist)
• Stormwater C.3 Guidebook
• Overview and step-by-step instructions for
  preparing a Stormwater Control Plan
• Guidebook Appendices and References
• With hyperlinks to design and technical resources