New Stormwater New Stormwater RegulationsRegulations

““C.3” Provisions C.3” Provisions in effect Feb. 15, 2005in effect Feb. 15, 2005

Protecting Water QualityProtecting Water Quality

1.1. Why managing Why managing stormwater is stormwater is important.important.

2.2. What we are What we are doing now.doing now.

3.3. How new How new development development affects affects water quality.water quality.

4.4. How the new regulations will be implemented.How the new regulations will be implemented.

What is a watershed?What is a watershed?

Managing Stormwater RunoffManaging Stormwater Runoff

Preventing Stormwater PollutionPreventing Stormwater Pollution Toxic pollutants like mercury and PCBsToxic pollutants like mercury and PCBs Sediment, oil and greaseSediment, oil and grease Household pesticides and detergentsHousehold pesticides and detergents

Managing Stormwater RunoffManaging Stormwater Runoff

Preventing Stormwater PollutionPreventing Stormwater Pollution Toxic pollutants like mercury and PCBsToxic pollutants like mercury and PCBs Sediment, oil and greaseSediment, oil and grease Household pesticides and detergentsHousehold pesticides and detergents

Quantity and timing of runoffQuantity and timing of runoff Paved, impervious roofs, parking, and streetsPaved, impervious roofs, parking, and streets Increased volume of flow and peak flow rate.Increased volume of flow and peak flow rate.

Who is involved?Who is involved?

Stormwater management activities are Stormwater management activities are coordinated throughout City departments.coordinated throughout City departments.

City participates in and cooperates with City participates in and cooperates with the Contra Costa Clean Water Program.the Contra Costa Clean Water Program. CCCWP includes 18 other Contra Costa cities CCCWP includes 18 other Contra Costa cities

and towns, Contra Costa County, and the and towns, Contra Costa County, and the Flood Control District .Flood Control District .

Oversight by the California Regional Water Oversight by the California Regional Water Quality Control Board (SF Bay Region).Quality Control Board (SF Bay Region).

What the City is Doing NowWhat the City is Doing Now Complies with storm Complies with storm

water discharge permit.water discharge permit. Inspects businesses.Inspects businesses. Minimizes pollutants Minimizes pollutants

from City activities.from City activities. Contributes to Contributes to

monitoring & pollution- monitoring & pollution- prevention studies.prevention studies.

Conducts outreach Conducts outreach and education.and education.

Municipal Stormwater Municipal Stormwater NPDES Permit HistoryNPDES Permit History

1994:1994: First countywide permit issued. First countywide permit issued. Focus on public outreach and education.Focus on public outreach and education.

1999:1999: Permit revised, added performance Permit revised, added performance standards for implementationstandards for implementation

February 2002:February 2002: Revised Permit Provision C.3. Revised Permit Provision C.3. (New and Redevelopment Requirements)(New and Redevelopment Requirements)

Effects of New DevelopmentEffects of New Development

Runoff Before DevelopmentRunoff Before Development

Runoff After DevelopmentRunoff After Development

Effects of increased runoffEffects of increased runoff

Increased flows and Increased flows and more frequent more frequent flooding leads to…flooding leads to…

Increased Increased streambank erosion, streambank erosion, which leads to…which leads to…

““Hardening” to Hardening” to prevent erosion, prevent erosion, which leads to…which leads to…

Loss of Stream FunctionsLoss of Stream Functions

SolutionsSolutions

Design areas that Design areas that allow runoff to allow runoff to infiltrate into soil.infiltrate into soil.

Use pervious paving.Use pervious paving. Integrate shallow Integrate shallow

detention basins into detention basins into landscaping.landscaping.

Use narrower streets; Use narrower streets; minimize impervious minimize impervious surface area.surface area.

SolutionsSolutions

Vegetated (“Dry”) SwaleVegetated (“Dry”) Swale

New Regulations for New Regulations for Development and RedevelopmentDevelopment and Redevelopment

Provision C.3. Requirements:Provision C.3. Requirements:

Projects (public & private) must detain Projects (public & private) must detain or treat runoff on site.or treat runoff on site. Projects with 1 acre or more impervious Projects with 1 acre or more impervious

surface approved after February 15, 2005surface approved after February 15, 2005

Projects with 10,000 square feet or more Projects with 10,000 square feet or more impervious surface approved after Oct. 2006impervious surface approved after Oct. 2006

Mandated design criteria for volume and flowMandated design criteria for volume and flow

Cities, towns Cities, towns & County must:& County must: Estimate and control Estimate and control

future increases in peak runoff future increases in peak runoff

Verify that on-site treatment devices are Verify that on-site treatment devices are maintainedmaintained

Update conditions of approval, design Update conditions of approval, design standards, General Plans, & environmental standards, General Plans, & environmental review processesreview processes

Contra Costa’s ApproachContra Costa’s Approach

Management Committee

Planning & Permitting Work Group

Technical WorkGroup

Legal Work Group

C.I.P.WorkGroup

C.3 Oversight Committee

Clean Water Program(Cities, Towns, County, CCFCWCD)

Preparations for C.3Preparations for C.3

Update to Model Stormwater OrdinanceUpdate to Model Stormwater Ordinance Stormwater C.3 GuidebookStormwater C.3 Guidebook

Require a Stormwater Control Plan for Require a Stormwater Control Plan for planning and zoning review planning and zoning review

Show how drainage from site will be routed Show how drainage from site will be routed through treatment facilitiesthrough treatment facilities

Memos on technical and policy issuesMemos on technical and policy issues Workshops for staff and applicantsWorkshops for staff and applicants

C.3 & Development ReviewC.3 & Development Review

Pre-ApplicationPre-ApplicationMeetingMeeting

CompletedCompletedApplicationApplication

““DeemedDeemedComplete”Complete”

SectionSectionReviewReview

CEQACEQAReviewReview

Conditions ofConditions ofApprovalApproval

Planning Planning CommissionCommission

DetailedDetailedDesignDesign Plan CheckPlan Check

PermitsPermitstoto

BuildBuild

Stormwater C.3 ComplianceStormwater C.3 Compliance

Pre-ApplicationPre-ApplicationMeetingMeeting

CompletedCompletedApplicationApplication

““DeemedDeemedComplete”Complete”

SectionSectionReviewReview

CEQACEQAReviewReview

Conditions ofConditions ofApprovalApproval

Planning Planning CommissionCommission

DetailedDetailedDesignDesign Plan CheckPlan Check

PermitsPermitstoto

BuildBuild

Staff Staff identifies identifies

general C.3 general C.3 requirementrequirement

ss

Section staff Section staff may review may review Stormwater Stormwater

Control Control Plan along Plan along with site, with site, grading, grading,

landscaping landscaping and other and other

plans plans

StormwateStormwater Control r Control Plan is Plan is

attached to attached to COAsCOAs

Staff reviews Staff reviews implementation of implementation of Plan in drawings & Plan in drawings &

specsspecs

Does Does applicant’s applicant’s Stormwater Stormwater Control Plan Control Plan address all address all

req’ts?req’ts?

Operation & MaintenanceOperation & Maintenance

StormwaterStormwaterControlControl

PlanPlan

StormwaterStormwaterFacilities Facilities

Operation & Operation & Maintenance PlanMaintenance Plan

StormwaterStormwaterFacilities Facilities

ComplianceComplianceCertificateCertificate

Submitted with

Planning & Zoning

Application

Draft submitted with construction documents

Renewedeachyear

General description

of O&M requirements

Detailed description and

maintenance plan for each

facility

Certification of inspection &

continued operation

Stormwater Control Plan ContentsStormwater Control Plan Contents Project SettingProject Setting Measures to Limit ImperviousnessMeasures to Limit Imperviousness Selection & Design of Treatment BMPsSelection & Design of Treatment BMPs Source Control MeasuresSource Control Measures Permitting and Code Compliance Permitting and Code Compliance BMP MaintenanceBMP Maintenance Construction Plan C.3 ChecklistConstruction Plan C.3 Checklist CertificationCertification

More InformationMore Information

Quick SummaryQuick Summary Stormwater Quality Control for Development Projects Stormwater Quality Control for Development Projects

(2-page fact sheet)(2-page fact sheet) Summary of Project Review ProcessSummary of Project Review Process

Stormwater C.3 Regulations Fact Sheet Stormwater C.3 Regulations Fact Sheet (4 pages; includes checklist)(4 pages; includes checklist)

Stormwater C.3 Guidebook Stormwater C.3 Guidebook Overview and step-by-step instructions for preparing Overview and step-by-step instructions for preparing

a Stormwater Control Plana Stormwater Control Plan Guidebook Appendices and ReferencesGuidebook Appendices and References

With hyperlinks to design and technical resources With hyperlinks to design and technical resources