Tom B. MeregillanoRegulatory SpecialistOrange County Sanitation District, CA

Tom B. MeregillanoRegulatory SpecialistOrange County Sanitation District, CA

OCSD Urban Runoff ProgramSCAP – Collection Systems in Motion

OCSD Urban Runoff ProgramSCAP – Collection Systems in Motion

Los AngelesLos Angeles

San DiegoSan Diego

Orange County,California

OCSD Service AreaOCSD Service Area

Santa AnaSanta Ana

Santa AnaRiver

Santa AnaRiver

July 1 - September 3, 1999 upto 4 1/2 miles (23,000 feet) ofHuntington Beach was closeddue to elevated bacteria level

July 1 - September 3, 1999 upto 4 1/2 miles (23,000 feet) ofHuntington Beach was closeddue to elevated bacteria level

Huntington State Beach, CaliforniaHuntington State Beach, California

Leaking Sewer Lines(groundwater flow)

Leaking Sewer LinesLeaking Sewer Lines(groundwater flow)(groundwater flow)

Urban Sources(nuisance &

stormwater runoff)

Urban SourcesUrban Sources(nuisance &(nuisance &

stormwater runoff)stormwater runoff)

EnvironmentalSources

(direct & tidal inputs)

EnvironmentalEnvironmentalSourcesSources

(direct & tidal inputs)(direct & tidal inputs)

Causes of Beach ClosuresCauses of Beach Closures

RunoffRunoff

Low Flow Diversion SystemsLow Flow Diversion Systems

Bermsin stormwater

channels

Pumpstationin stormwater

well

Pumpstationin stormwater

well

OCSDwastewater

treatment plant

OCSDwastewater

treatment plant

Low Flow Diversion SystemsLow Flow Diversion Systems

Concreteberm

Concreteberm

Diversion pipeconnected

to sewer line

Diversion pipeconnected

to sewer line

Temporary –Santa Ana River Channel DiversionTemporary –Santa Ana River Channel Diversion

Concrete Damto Wet Well

Concrete Damto Wet Well

Permanent –Santa Ana River Channel DiversionPermanent –Santa Ana River Channel Diversion

Concreteberm

Concreteberm

Diversion pipeconnected

to sewer line

Diversion pipeconnected

to sewer line

Temporary – Channel DiversionTemporary – Channel Diversion

Permanent – Channel DiversionPermanent – Channel Diversion

InflatableRubber Dam

InflatableRubber Dam

Diversion pipe connectedto sewer line

Diversion pipe connectedto sewer line

Wet wellWet well

Stormwater / Urban RunoffPump StationStormwater / Urban RunoffPump Station

Urban Runoff – Why Care?Urban Runoff – Why Care?

u Public healthu Recreational

water bodiesu Economyu Quality of life

u Public healthu Recreational

water bodiesu Economyu Quality of life

Important RegulationsImportant Regulations

u Orange County stormwater NPDESpermit

u Assembly Bill 411 (ocean water –contact sports standards)

u Total Maximum Daily Load (TMDL)

u Orange County stormwater NPDESpermit

u Assembly Bill 411 (ocean water –contact sports standards)

u Total Maximum Daily Load (TMDL)

Orange County13 Watersheds

40–70 MGD dry weather urban runoff

Orange County13 Watersheds

40–70 MGD dry weather urban runoff

SealBeachSeal

Beach

Bolsa ChicaState BeachBolsa ChicaState Beach

HuntingtonState BeachHuntingtonState Beach

NewportBay

NewportBay

Sant

a An

aSa

nta

Ana

Rive

rRi

ver

TMDL AreasTMDL Areas

CrystalCove Creek

CrystalCove Creek

OCSD’s Urban Runoff SolutionsOCSD’s Urban Runoff Solutions

u Aug 1999 – Stormwater pump stationdiversions

u Jun 2000 – Channel and river diversions

u Sep 2000 – Dry Weather Urban Runoff Policy

u Jan 2002 – Proposal to amend OCSD’sCharter – AB 1892

u Jun 2002 – Legislation AB 1892 approvedby Governor

u Aug 1999 – Stormwater pump stationdiversions

u Jun 2000 – Channel and river diversions

u Sep 2000 – Dry Weather Urban Runoff Policy

u Jan 2002 – Proposal to amend OCSD’sCharter – AB 1892

u Jun 2002 – Legislation AB 1892 approvedby Governor

ORANGECOUNTYORANGECOUNTY

OCSD Santa MargaritaWater District

Irvine Ranch WaterDistrict

City ofLaguna Beach City of

San Clemente

Emerald BayServices District

South CoastWater District

Moulton NiguelWater District

Agencies in Orange CountyTreating Urban RunoffAgencies in Orange CountyTreating Urban Runoff

SealBeach

HuntingtonBeach

FountainValley

CostaMesa

NewportBeach

SantaAna

Irvine

Westminster

GardenGrove

Tustin

16 Current16 Current

28 Proposed28 Proposed

DiversionsDiversions

10 MGD10 MGD

4 MGD4 MGD3 MGD3 MGD

MAXIMUM Capacity

Fee Threshold

Flow Volume

Orange County Sanitation DistrictDry Weather Urban Runoff Diversion Monthly Averages, gpd

1,326

,932

728,8

97

1,616

,124

1,900

,012

2,366

,041

2,432

,316

2,413

,271

2,061

,429

919,3

37

769,2

59

871,1

70

666,2

22

530,3

11

787,3

74

783,1

08

2,832

,740

2,847

,238

3,058

,586

1,243

,397

2,407

,785

-

500,000

1,000,000

1,500,000

2,000,000

2,500,000

3,000,000

3,500,000

4,000,000Ja

n'04 Feb

Mar

Apr

May

Jun Jul

Aug

Sep

Oct

Nov

Dec

Jan'0

5 Feb

Mar

Apr

May

Jun Jul

Aug

monthly average

gallo

ns pe

r day

Decreasein Overall30-Day GeometricMean Post Diversions

Decreasein Overall30-Day GeometricMean Post Diversions

Decreasein Overall30-Day GeometricMean Post Diversions

Decreasein Overall30-Day GeometricMean Post Diversions

OCSD Urban Runoff ProgramOCSD Urban Runoff Program

u 6 years experience

u Treating as high as 3 MGD of dry weather urbanrunoff from coastal cities during the summer

u No fees if under 4 MGD & 10 MGD maximumflow

u Permit and enforcement

u Treatment Costs approx. $529,000 annual @ave. 1.5MGD

u 6 years experience

u Treating as high as 3 MGD of dry weather urbanrunoff from coastal cities during the summer

u No fees if under 4 MGD & 10 MGD maximumflow

u Permit and enforcement

u Treatment Costs approx. $529,000 annual @ave. 1.5MGD

Benefits OCSD Urban RunoffProgramBenefits OCSD Urban RunoffProgramu One tool for for addressing NDPES permit,

AB411, and TDML regulations

u Containment for SSOs

u Public health and environmental protection

u Economic benefits

u Foster regional partnerships and newtechnologies

u One tool for for addressing NDPES permit,AB411, and TDML regulations

u Containment for SSOs

u Public health and environmental protection

u Economic benefits

u Foster regional partnerships and newtechnologies

Issues Related to Urban RunoffDiversionIssues Related to Urban RunoffDiversionu One tool of many

u Emerging pollutants

u Limited collection and treatment capacity

• Storm flows impossible to divert

• What about “first flush”?

• Who builds and operates the infrastructure?

u Who takes responsibility – who pays?

u One tool of many

u Emerging pollutants

u Limited collection and treatment capacity

• Storm flows impossible to divert

• What about “first flush”?

• Who builds and operates the infrastructure?

u Who takes responsibility – who pays?

Regional Cooperative Projects inOrange County

Regional Cooperative Projects inOrange County

Dry WeatherDiversion SystemDry WeatherDiversion System

WetlandTreatment SystemWetlandTreatment System

Tom Meregillano(714) 593-7457Source Control Divisiontmeregillano@ocsd.com

Tom Meregillano(714) 593-7457Source Control Divisiontmeregillano@ocsd.com

Orange County Sanitation Districtwww.ocsd.comOrange County Sanitation DistrictOrange County Sanitation Districtwww.ocsd.comwww.ocsd.com

Questions?Questions?