11

Stormwater Ordinance RevisionsStormwater Ordinance Revisions

Transportation & Environment CommitteeTransportation & Environment Committee

September 12, 2011September 12, 2011

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Purpose(s)Purpose(s)

Updates April 28, 2008 BriefingUpdates April 28, 2008 Briefing

Provides Regulatory BackgroundProvides Regulatory Background

Describes Drivers for Changes Describes Drivers for Changes

Summarizes Proposed RevisionsSummarizes Proposed Revisions

Describes Next StepsDescribes Next Steps

Why is there a Storm Drainage Why is there a Storm Drainage Ordinance?Ordinance?

Section 402 of the Federal Clean Water Section 402 of the Federal Clean Water Act requires cities to have a Municipal Act requires cities to have a Municipal Separate Storm Sewer System (MS4) Separate Storm Sewer System (MS4) permit to discharge stormwater runoff into permit to discharge stormwater runoff into Trinity River.Trinity River.

MS4 permit is currently a Texas Pollutant MS4 permit is currently a Texas Pollutant Discharge Elimination System (TPDES) Discharge Elimination System (TPDES) permit.permit.

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CitiesCities’’ MS4 Permit MS4 Permit RequirementsRequirements

Develop Stormwater Management Plan to outline how Develop Stormwater Management Plan to outline how City will meet requirements to protect water qualityCity will meet requirements to protect water quality

Monitor Water QualityMonitor Water Quality

Enforce compliance with TPDES Construction General Enforce compliance with TPDES Construction General Permit for all construction projects > 1 acre in DallasPermit for all construction projects > 1 acre in Dallas

Enforce compliance with TPDES MultiEnforce compliance with TPDES Multi--Sector General Sector General Permit for all industrial facilities in DallasPermit for all industrial facilities in Dallas

Provide Public Education & OutreachProvide Public Education & Outreach

Maintain legal framework to perform permit activities Maintain legal framework to perform permit activities including compliance and enforcementincluding compliance and enforcement

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NPDES vs TPDES?NPDES vs TPDES?

Dallas Stormwater Program originated while EPA was in charge of Dallas Stormwater Program originated while EPA was in charge of stormwater protection nationwidestormwater protection nationwide

The EPA issues permits for discharge to water bodies under the The EPA issues permits for discharge to water bodies under the NNational ational PPollutant ollutant DDischarge ischarge EElimination limination SSystem ystem PPermit ermit (NPDES)(NPDES)

Over time, the EPA delegated stormwater permitting authority to Over time, the EPA delegated stormwater permitting authority to the states (with exceptions of Federal facilities, Tribes, and athe states (with exceptions of Federal facilities, Tribes, and a few few states like Idaho and Maryland)states like Idaho and Maryland)

In Texas, the Texas Commission on Environmental Quality (TCEQ) In Texas, the Texas Commission on Environmental Quality (TCEQ) issues permits for discharges to water bodies under the issues permits for discharges to water bodies under the TTexas exas PPollutant ollutant DDischarge ischarge EElimination limination SSystem ystem PPermit program ermit program (TPDES)(TPDES)

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Regulatory BackgroundRegulatory BackgroundFederal Clean Water Act (Section 402)Federal Clean Water Act (Section 402)

Congress EPAEPA Texas

Texas Water Code (Chapter 26)Texas Water Code (Chapter 26)Texas Legislature TCEQ

City of Dallas Stormwater Management

SStorm Drainage Ordinancetorm Drainage OrdinanceDel

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Stormwater OrdinanceStormwater Ordinance

Article IX Storm Water Article IX Storm Water Drainage SystemDrainage System

Section 19, Chapter 118 Section 19, Chapter 118 of City Codeof City Code

Last Revised: Last Revised: September, 1999September, 1999

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Revisions Update Ordinance to Revisions Update Ordinance to Reflect Regulatory Changes:Reflect Regulatory Changes:

TPDES MultiTPDES Multi--Sector Sector (Industrial) Permit (Industrial) Permit -- August, August, 2006 & 20112006 & 2011

TPDES General Construction TPDES General Construction Permit Permit -- March 5, 2008March 5, 2008

Dallas MS4 TPDES Permit Dallas MS4 TPDES Permit -- October 2006 & 2011October 2006 & 2011

Stormwater Management Plan Stormwater Management Plan October 2011October 2011

Recent changes to Federal Recent changes to Federal Stormwater programStormwater program

Also incorporates local Also incorporates local ““lessons learnedlessons learned””

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Section 19Section 19--118 Definitions118 Definitions

Primary Changes:Primary Changes:

““NPDESNPDES”” changed to changed to ““NPDES or TPDESNPDES or TPDES””

““EPAEPA”” changed to changed to ““EPA EPA or TCEQor TCEQ””

““Storm WaterStorm Water”” changed changed to to ““StormwaterStormwater””

20 other minor text 20 other minor text clarifications & definitionsclarifications & definitions

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Section 19Section 19--118.2 Prohibited Discharges118.2 Prohibited Discharges

Primary Changes:Primary Changes:

Strengthened requirements Strengthened requirements to limit pool discharges to limit pool discharges

•• Chlorine discharge limit revised Chlorine discharge limit revised from 5 mg/L to 1 mg/L from 5 mg/L to 1 mg/L (consistent with current (consistent with current DWU practices)DWU practices)

•• Specific Conductivity value Specific Conductivity value added to limit highly saline added to limit highly saline discharges from salt water discharges from salt water poolspools

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Section 19Section 19--118.2 Prohibited Discharges118.2 Prohibited Discharges

Minor revisions added to clarify Minor revisions added to clarify requirements for:requirements for:

Portable restrooms Portable restrooms (Discharges not allowed)(Discharges not allowed)

Commercial mobile car washes, Commercial mobile car washes, including those at office buildings including those at office buildings and parking garages (Direct and parking garages (Direct discharge not allowed)discharge not allowed)

Power washers (Discharges Power washers (Discharges without soap allowed)without soap allowed)

Allowable limits related to site dust Allowable limits related to site dust and sawcutting definedand sawcutting defined

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Primary Changes: Primary Changes:

Allows temporary Allows temporary removal of protection in removal of protection in City streets during City streets during extreme storm events to extreme storm events to prevent floodingprevent flooding

Based on National Based on National Weather Service Urban Weather Service Urban Flood warnings and Flood warnings and advisoriesadvisories

Section 19Section 19--118.6 Stormwater 118.6 Stormwater Discharges from Construction ActivitiesDischarges from Construction Activities

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Adds requirements to Adds requirements to be consistent with be consistent with current Construction current Construction General Permit:General Permit:

Requires protection for Requires protection for runoff from onsite runoff from onsite concrete batch plantsconcrete batch plants

Requires onsite concrete Requires onsite concrete washoutswashouts

Requires secondary Requires secondary containment for onsite containment for onsite hazardous materials hazardous materials

Section 19Section 19--118.6 Stormwater 118.6 Stormwater Discharges from Construction ActivitiesDischarges from Construction Activities

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Other minor text revisions:Other minor text revisions:

Clarifies Best Management Clarifies Best Management Practices & Stormwater Practices & Stormwater Pollution Prevention Plan Pollution Prevention Plan (SWPPP) requirements(SWPPP) requirements

Requires proper discharge from Requires proper discharge from portable sanitation facilities portable sanitation facilities (porta(porta--potties)potties)

Requires dust mitigation for Requires dust mitigation for >> 25 square feet of dust25 square feet of dust

Section 19Section 19--118.6 Stormwater 118.6 Stormwater Discharges from Construction Discharges from Construction

ActivitiesActivities

1515

Section 19Section 19--118.7 Stormwater 118.7 Stormwater Discharges from Industrial ActivitiesDischarges from Industrial Activities

Primary ChangePrimary Change

Clarifies Water Quality Clarifies Water Quality Standards by removing list Standards by removing list of chemical parameters of chemical parameters and numeric limits and and numeric limits and referencing current Texas referencing current Texas Surface Water Quality Surface Water Quality Standards (by TCEQ)Standards (by TCEQ)

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Section 19Section 19--118.7 Stormwater 118.7 Stormwater Discharges from Industrial ActivitiesDischarges from Industrial Activities

Primary Changes:Primary Changes:

Adds requirements for Adds requirements for secondary containment for secondary containment for onsite storage tanks that onsite storage tanks that hold hazardous substanceshold hazardous substances

Specifies minimum volume Specifies minimum volume (110%) and audible alarm (110%) and audible alarm notification requirements for notification requirements for secondary containmentsecondary containment

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Section 19Section 19--118.7 Stormwater 118.7 Stormwater Discharges from Industrial ActivitiesDischarges from Industrial Activities

Minor clarifications added for Minor clarifications added for consistency with industrial consistency with industrial permits that require: permits that require:

Proper Waste DisposalProper Waste Disposal

Spill PreventionSpill Prevention

Reducing Exposure to Reducing Exposure to PrecipitationPrecipitation

Identification of Standard Identification of Standard Industrial Classification Code Industrial Classification Code for facilityfor facility

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Section 19Section 19--118.3: 118.3: Pesticides, Herbicides Pesticides, Herbicides and Fertilizersand Fertilizers

Section 19Section 19--118.4: Used 118.4: Used Oil/Household Oil/Household Hazardous WasteHazardous Waste

Section 19Section 19-- 118.5 118.5 Discharge Prevention, Discharge Prevention, Reporting And CleanupReporting And Cleanup

Section 19Section 19--118.8 118.8 Compliance MonitoringCompliance Monitoring

Minor Text Revisions Only:Minor Text Revisions Only:

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1919

Timeframe for ImplementationTimeframe for Implementation

Committee Briefing and

Direction

Finalize Ordinance Language

Public Hearing

Adoption Ordinance Takes Effect

OutreachOutreach

Today October 2011 November 2011 January 2012 April 1, 2012

2020

Related Outreach EffortsRelated Outreach Efforts

Utility Bill InsertUtility Bill Insert

33--11--1 1 ““Hot TopicsHot Topics””

Update to WebsiteUpdate to Website

Stakeholder MeetingsStakeholder Meetings

Updates to SWM Updates to SWM Stakeholder training Stakeholder training workshopsworkshops

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Questions?Questions?Susan Alvarez, P.E.Susan Alvarez, P.E.

Trinity Watershed Management DepartmentTrinity Watershed Management DepartmentStormwater ManagementStormwater Management

(214) 948 (214) 948 -- 44504450Susan.Alvarez@DallasCityHall.comSusan.Alvarez@DallasCityHall.com

Http://www.greendallas.netHttp://www.greendallas.netHttp://www.Wheredoesitgo.comHttp://www.Wheredoesitgo.com

Http://www.TrinityHttp://www.Trinity--Trudy.comTrudy.com