cpac meeting 12-15-03

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Water Quality Update Water Quality Update Presented to CPAC January 12, 2003

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Page 1: CPAC Meeting 12-15-03

Water Quality UpdateWater Quality Update

Presented to CPAC

January 12, 2003

Page 2: CPAC Meeting 12-15-03

Objectives of Objectives of PresentationPresentation

• How tasks fit together to support the Long Term Control Plan

• What has been accomplished

Page 3: CPAC Meeting 12-15-03

Tools to Understand CSO Tools to Understand CSO ImpactsImpacts

• Flow Characterization• System Characterization and Flow Metering

• Hydraulic Sewer Model• Water Quality Study• Water Quality Model• Long Term Control Plan

Page 4: CPAC Meeting 12-15-03

Consent Decree Consent Decree RequirementsRequirements

• All study efforts required by consent decree

• CD included specific items each study must include

• Study work plans were approved April 7, 2003

• Reports for Flow Characterization and Water Quality Study are due in April 2004.

• Long Term Control Plan Report due October 2005.

Page 5: CPAC Meeting 12-15-03

System CharacterizationSystem Characterization

Subcatchment

Overland flow

Infiltratio

n

Domesticwastewater

Bayview WaterReclamation

Facility

Industrial wastewater

Page 6: CPAC Meeting 12-15-03

Flow MeteringFlow Metering

Subcatchment

Overland flow

Infiltratio

n

Domesticwastewater

Bayview WaterReclamation

Facility

Dry Weather Flow

StormwaterFlow

CombinedFlow

Combined SewerOverflow

Industrial wastewater

Flow toPOTW

Page 7: CPAC Meeting 12-15-03

Hydraulic Sewer ModelingHydraulic Sewer Modeling

Subcatchment

Overland flow

Infiltratio

n

Domesticwastewater

Bayview WaterReclamation

Facility

Industrial wastewater

Page 8: CPAC Meeting 12-15-03

Water Quality StudyWater Quality Study

Subcatchment

Overland flow

Infiltratio

n

Domesticwastewater

FLOW

Bayview WaterReclamation

Facility

Industrial wastewater

Page 9: CPAC Meeting 12-15-03

Water Quality ModelWater Quality Model

Subcatchment

Overland flow

Infiltratio

n

Domesticwastewater

FLOW

Bayview WaterReclamation

Facility

Industrial wastewater

Page 10: CPAC Meeting 12-15-03

Long Term Control PlanLong Term Control Plan

Subcatchment

Overland flow

Infiltratio

n

Domesticwastewater

FLOW

Bayview WaterReclamation

Facility

CSO StorageFacility

Industrial wastewater

Page 11: CPAC Meeting 12-15-03

How Monitoring/ Models Are How Monitoring/ Models Are Used in Long Term Control Used in Long Term Control PlanningPlanning• Monitoring

• Shows current conditions• Helps identify unusual operating conditions• Provide data to make sure models make sense

• Models• Fill in the gaps where we can’t monitor• Predicts what will happen with different rainfall

conditions• Allows evaluation of changes to the system

Page 12: CPAC Meeting 12-15-03

2003 Flow Metering 2003 Flow Metering LocationsLocations

Page 13: CPAC Meeting 12-15-03

2003 Flow Metering 2003 Flow Metering ProgramProgram• Meter Installation • Meters Installed May through August• Site Visits – Site Check/Data Download weekly

Page 14: CPAC Meeting 12-15-03

Metering Locations – data Metering Locations – data setset

Page 15: CPAC Meeting 12-15-03

Data SetData Set

• 1999 City-wide Flow Monitoring Study – 48 meters

• SCADA data – 47 data collection locations• 2003 Data – 36 metering locations• Point Place - __ metering locations• Overall – 130+ metering locations with

consistent data analysis techniques

Page 16: CPAC Meeting 12-15-03

2003 Metering Period 2003 Metering Period Rain EventsRain Events• Several Rain Events Greater than One Inch

Date of Wet Weather Event

Amount of Rain (inches)

Percentage of Meters Recording Data

May 9, 2003 2.01 42%

May 31, 2003 1.07 88%

June 11, 2003 1.36 97%

July 7, 2003 1.58 97%

August 3, 2003 2.66 73%

September 1, 2003 3.57 91%

Page 17: CPAC Meeting 12-15-03

Sanitary Area Flow Sanitary Area Flow ContributionsContributions• Percent Capture – 1999 and 2003

Page 18: CPAC Meeting 12-15-03

Sanitary Area Flow Sanitary Area Flow ContributionsContributions• Peaking Factor – 1999 and 2003

Page 19: CPAC Meeting 12-15-03

Sanitary Area Flow Sanitary Area Flow ContributionsContributions

• Separated portions of the sewer system will contribute significant flow in wet weather.

• There are a number of very wet areas of the system where flow reduction work is encouraged

• The sanitary flow rates during wet weather are important to consider in evaluating CSO control alternatives and the overall impact on the plant

Page 20: CPAC Meeting 12-15-03

Combined Area Flow Combined Area Flow ContributionsContributions• Combined Area Flow

(Hydrologic) Response• This is a critical

parameter for modeling.

• Values fall within typical ranges

• 73% of Combined Area Monitored

Page 21: CPAC Meeting 12-15-03

Estimated Capture Rates Estimated Capture Rates 20032003

0102030405060708090

100

% f

low

cap

ture

d

Page 22: CPAC Meeting 12-15-03

Combined Flow SummaryCombined Flow Summary

• Data collected to calibrate model

• Ability of flow to be delivered to the interceptor varies significantly by regulator• Variability in frequency of discharge• Overloading of interceptor system

Page 23: CPAC Meeting 12-15-03

Windermere Pump Windermere Pump StationStation9/1/03 Response9/1/03 Response

Page 24: CPAC Meeting 12-15-03
Page 25: CPAC Meeting 12-15-03
Page 26: CPAC Meeting 12-15-03

System Hydraulics - System Hydraulics - observationsobservations• The system backs up during wet weather events

• The majority of the back up seems to start at the WWTP

• Because of the backups, flow reverses direction in the sewers. More overflow to the waterways also occurs.

Page 27: CPAC Meeting 12-15-03

System Hydraulics - System Hydraulics - consequencesconsequences• Once the WWTP can process more flow

• System backup should be reduced• Less CSO discharge to the waterways• Less risk of basement backup

Page 28: CPAC Meeting 12-15-03

Water Quality StudyWater Quality Study• Instream (CSO Area)

• Dry weather sampling (2 events)• Wet weather sampling (2 events)

• Upstream Boundary (Watershed)• Dry/wet, 17 weekly sampling events

• Intensive DO Monitoring• Two 2-week periods

Page 29: CPAC Meeting 12-15-03

2003 Sampling Locations2003 Sampling Locations

Page 30: CPAC Meeting 12-15-03

Wet Weather Event Wet Weather Event MonitoringMonitoring• May 1, 2003:

• Fast-moving spring storm (shown)

• 0.6” at Toledo Express• CSO duration ~ 2 hours

• September 1, 2003– Slower-moving late summer

storm– 2.6” at Toledo Express– CSO duration ~ 14 hours

Page 31: CPAC Meeting 12-15-03

Peak Fecal Coliform, Wet Weather Event #2

0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

40,000

O1 O2 O3 O5 O5.5

Sampling Station

fec

al c

olif

orm

(#

/10

0 m

L)

Peak Fecal Coliform, Wet Weather Event #1

0

200

400

600

800

1,000

1,200

1,400

1,600

1,800

2,000

O1 O2 O3 O5 O5.5

Sampling Station

fec

al c

olif

orm

(#

/10

0 m

L)

WW Monitoring Results - WW Monitoring Results - BacteriaBacteriaOttawa River:• WW1 – low concentrations,

dominated by upstream

• WW2 – high upstream + significant in-stream contribution

• Decreased concentrations downstream due to Maumee Bay mixing

Primary Contact Recreational Standard

Primary Contact Recreational Standard

Page 32: CPAC Meeting 12-15-03

Mid-event DO, Wet Weather Event #2

0

2

4

6

8

10

12

14

M1 M2 M4 M6

Sampling Station

dis

so

lve

d o

xy

ge

n (

mg

/L)

Mid-event DO, Wet Weather Event #1

0

2

4

6

8

10

12

14

M1 M2 M4 M6

Sampling Station

dis

so

lve

d o

xy

ge

n (

mg

/L)

WW Monitoring Results – WW Monitoring Results – Dissolved OxygenDissolved Oxygen

Mid-event DO, Dry Weather Sampling

0

2

4

6

8

10

12

14

M1 M2 M4 M6

Sampling Station

dis

solv

ed o

xyg

en (m

g/L

)

• Maumee River• WW1 – Aeration elevates DO

• WW2 – CSOs also reduce downstream DO

Page 33: CPAC Meeting 12-15-03

Consent Decree Consent Decree Requirements – Hydraulic Requirements – Hydraulic Sewer ModelSewer Model• Workplan, approved April 7, 2003

• Develop sewer model to predict:• Flows • Hydraulic grade lines and capacities • CSO frequencies and volumes

• Use in conjunction with WQ model to support Long Term Control Plan

Page 34: CPAC Meeting 12-15-03

Hydraulic Model CoverageHydraulic Model Coverage

Page 35: CPAC Meeting 12-15-03

Status of Hydraulic ModelStatus of Hydraulic Model

• East Side model is operational• Calibrated to 2003 metering data• Calibration is preliminary, pending:

• West Side and 10-Mile Creek calibrations - consistency

• Runs with complete model - reasonableness

• West Side calibration not far behind

• 10-Mile Creek to be calibrated in December

Page 36: CPAC Meeting 12-15-03

East Side Hydraulic East Side Hydraulic SubmodelSubmodel

Page 37: CPAC Meeting 12-15-03

Calibration to 2003 Metering Calibration to 2003 Metering DataData

• Also important to accurately estimate flows to interceptor (example: Eastside Interceptor)

0

10

20

30

40

50

60

70

80

May-30 Jun-1 Jun-3 Jun-5 Jun-7 Jun-9 Jun-11 Jun-13 Jun-15 Jun-17 Jun-19

flo

w (

cfs

)

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

rain

(in

ch

es

)

rain monitoring data model results

Page 38: CPAC Meeting 12-15-03

Consent Decree Consent Decree Requirements – WQ ModelRequirements – WQ Model

• Workplan, approved April 7, 2003

• Model shall be capable of:• Accurately modeling WQ in the 3 streams

• Under wide range of conditions

• Assessing impacts of CSOs on WQ• Assessing changes in CSO impact due to Long Term

Control measures under evaluation

Page 39: CPAC Meeting 12-15-03

SummarySummary

• Flow Characterization Study - close to completion

• Water Quality Study - on schedule• Hydraulic Model - on schedule about ready to

use• Water Quality Model – will build off of

hydraulic model• Long Term Control Plan – will use the models

as tools to develop alternatives

Page 40: CPAC Meeting 12-15-03

Next StepsNext Steps

• Long Term Control Plan – begin evaluation of alternatives

• Gather input from stakeholders and the general public