Stormwater RegulationsStormwater Regulations

NC Division Of Water Quality

DPPEA Technical Sharing Session

May 25, 2004

•Increased ImperviousnessIncreased Imperviousness

•Increased RunoffIncreased Runoff

•Increased PollutantsIncreased Pollutants

•Impacts to StreambanksImpacts to Streambanks

•Erosion/SedimentationErosion/Sedimentation

Why Be Concerned About StormwaterWhy Be Concerned About Stormwater

Why be Concerned about Stormwater?Why be Concerned about Stormwater?

Declining water qualityDeclining water quality

Increasing demand for clean Increasing demand for clean waterwater

UrbanizationUrbanization:: Population doubling every 50 Population doubling every 50

yearsyears 88% increase in urban area 88% increase in urban area

from 1982-1997 (USDA-NRCS)from 1982-1997 (USDA-NRCS)

State Stormwater Programs

State Stormwater Management ProgramState Stormwater Management Program

Water Supply Watershed Protection Water Supply Watershed Protection

ProgramProgram

401 Water Quality Certification Program 401 Water Quality Certification Program

Nutrient Sensitive Waters ProgramsNutrient Sensitive Waters Programs

General Management General Management StrategyStrategy

State StormwaterState Stormwater

New Development / RedevelopmentNew Development / Redevelopment

Minimize Impervious Cover-12% to Minimize Impervious Cover-12% to 30% BUA30% BUA

Use Passive Stormwater ManagementUse Passive Stormwater Management

Engineered Controls Where Engineered Controls Where Necessary, to remove 85% TSSNecessary, to remove 85% TSS

Approvals From State or Local Gov.Approvals From State or Local Gov.

NPDES StormwaterNPDES Stormwater

Phase IPhase I Industrial ActivitiesIndustrial Activities Construction Sites Construction Sites 5 acres 5 acres Large and Medium MS4sLarge and Medium MS4s

Phase IIPhase II Small MS4sSmall MS4s Construction Sites Construction Sites 1 acre 1 acre Industrial No-Exposure CertificationIndustrial No-Exposure Certification

NPDES Industrial Coverage

Manufacturing/Process Type Manufacturing/Process Type ActivitiesActivities

Private and Public EntitiesPrivate and Public Entities

Comprehensive Stormwater Pollution Comprehensive Stormwater Pollution Prevention PlansPrevention Plans

Regular Review and AssessmentRegular Review and Assessment

Construction NPDES CoverageConstruction NPDES Coverage

Required Required In AdditionIn Addition to E&SC Plan to E&SC Plan

Point Source Discharges of StormwaterPoint Source Discharges of Stormwater

Projects Greater Than One AcreProjects Greater Than One Acre

Permit ConditionsPermit ConditionsLimitations & ControlsLimitations & Controls

Submit and Receive Approved E & S PlanSubmit and Receive Approved E & S Plan

Comply With Approved E & S PlanComply With Approved E & S Plan

Materials Handling - fuel, oil, waste, etc.Materials Handling - fuel, oil, waste, etc.

Chemical Application - fertilizers, etc.Chemical Application - fertilizers, etc.

Operation and MaintenanceOperation and Maintenance

Municipal NPDES CoverageMunicipal NPDES Coverage

Automatically Designated - Automatically Designated - Urbanized Urbanized

AreasAreas

State Designated Public EntitiesState Designated Public Entities

Petitioned Entities That Are State Petitioned Entities That Are State

DesignatedDesignated

2000 USA Census Urbanized Areas2000 USA Census Urbanized Areas

Automatic designation by USEPA of Automatic designation by USEPA of municipal separate storm sewer systems municipal separate storm sewer systems (MS4s)(MS4s)

North Carolina - NPDES Stormwater Program

HYDE

DARE

PITT

WAKE

DUPLIN

BLADEN

PENDER

BERTIE

UNION

WILKES

NASH

CARTERET

ROBESON

SAMPSON

MOORE

CRAVEN

ONSLOW

BEAUFORT

HALIFAX

COLUMBUS

SWAIN

ASHE SURRY

ANSON

WAYNE

BURKE

BRUNSWICK

JOHNSTON

CHATHAM

IREDELL

RANDOLPH

JONES

MACON

HOKE

LEE

TYRRELL

ROWAN

HARNETT

GUILFORD

PAMLICO

MARTIN

BUNCOMBE

STOKES

DAVIDSON

LENOIR

JACKSON

STANLY

HAYWOOD

GATES

FRANKLIN

WARREN

MADISON

PERSON

GRANVILLE

CUMBERLAND

WILSON

ORANGE

YADKIN

POLK

CASWELL

DAVIE

CALDWELL

RICHMOND

FORSYTH

GASTON

CLAY

CHEROKEE

ROCKINGHAM

CATAWBA

RUTHERFORD

ALAMANCE

CLEVELAND

VANCE

EDGECOMBE

MCDOWELL

YANCEY

CURRITUCK

AVERY

MECKLENBURG

LINCOLN

CAMDENNORTHAMPTON

GRAHAM

DURHAM

MONTGOMERYCABARRUS

HERTFORD

GREENE

WATAUGA

WASHINGTON

SCOTLAND

HENDERSON

CHOWAN

TRANSYLVANIA

PERQUIMANS

MITCHELL

ALEXANDER

PASQUOTANK

ALLEGHANY

NEW HANOVER

Counties

1990 Census2000 CensusPhase I

Municipalities1990 Census2000 CensusPhase I

North Carolina NPDES Stormwater Program

Automatic Coverage

HYDE

DARE

PITT

WAKE

DUPLIN

BLADEN

PENDER

BERTIE

UNION

WILKES

NASH

CARTERET

ROBESON

SAMPSON

MOORE

CRAVEN

ONSLOW

BEAUFORT

HALIFAX

COLUMBUS

SWAIN

ASHE SURRY

ANSON

WAYNE

BURKE

BRUNSWICK

JOHNSTON

CHATHAM

IREDELL

RANDOLPH

JONES

MACON

HOKE

LEE

TYRRELL

ROWAN

HARNETT

GUILFORD

PAMLICO

MARTIN

BUNCOMBE

STOKES

DAVIDSON

LENOIR

JACKSON

STANLY

HAYWOOD

GATES

FRANKLIN

WARREN

MADISON

PERSON

GRANVILLE

CUMBERLAND

WILSON

ORANGE

YADKIN

POLK

CASWELL

DAVIE

CALDWELL

RICHMOND

FORSYTH

GASTON

CLAY

CHEROKEE

ROCKINGHAM

CATAWBA

RUTHERFORD

ALAMANCE

CLEVELAND

VANCE

EDGECOMBE

MCDOWELL

YANCEY

CURRITUCK

AVERY

MECKLENBURG

LINCOLN

CAMDENNORTHAMPTON

GRAHAM

DURHAM

MONTGOMERYCABARRUS

HERTFORD

GREENE

WATAUGA

WASHINGTON

SCOTLAND

HENDERSON

CHOWAN

TRANSYLVANIA

PERQUIMANS

MITCHELL

ALEXANDER

PASQUOTANK

ALLEGHANY

NEW HANOVER

Counties

PSD - >45K

1990 Census2000 CensusPhase I

Municipalities1990 Census2000 Census

PSDPSD - 10K/1KPhase I

PSD = Possible State Designee

North Carolina - NPDES Stormwater Program

North Carolina - NPDES Stormwater Program

North Carolina NPDES Stormwater Program

Automatic & Possible State Designation

Minimum Control ElementsMinimum Control Elements

Public Education and OutreachPublic Education and Outreach

Public Involvement/ParticipationPublic Involvement/Participation

Illicit Discharge Detection & EliminationIllicit Discharge Detection & Elimination

Construction Site Runoff ControlConstruction Site Runoff Control

Post-construction Stormwater Post-construction Stormwater

ManagementManagement

Pollution Prevention/Good HousekeepingPollution Prevention/Good Housekeeping

Post Construction Runoff ControlPost Construction Runoff Control

New development and redevelopmentNew development and redevelopment 1-year / 24-hour storm control1-year / 24-hour storm control 85% average annual TSS removal85% average annual TSS removal Operation & maintenance of BMPsOperation & maintenance of BMPs Specific requirements for Class SA, Tr, Specific requirements for Class SA, Tr,

NSWNSW

Penalties for Penalties for NoncomplianceNoncompliance

Penalty not to exceed $25,000 per day per Penalty not to exceed $25,000 per day per violation.violation.

Information SourcesInformation Sources

Division of Water Quality Division of Water Quality Stormwater and General Permits UnitStormwater and General Permits Unit

http://h2o.enr.state.nc.us/su/stormwater.htmlhttp://h2o.enr.state.nc.us/su/stormwater.html

Environmental Protection Agency http://cfpub.epa.gov/npdes/http://cfpub.epa.gov/npdes/

GROUTED RIP RAP ENERGY

DISSIPATOR

Grouted rip rap replaced with “wet

meadow” and sediment forebay