BEFORE THE ILLINOIS POLLUTION CONTROL BOARD

IN THE MATTER OF :

RECEIVED

)

R04-25

CLERK'S OFFICE

PROPOSED AMENDMENTS TO

)

(Rulemaking - Water)

OCT 0 2 2006

DISSOLVED OXYGEN STANDARD )

35

ILL. ADM. CODE 302.206

STATE OF ILLINOIS

)

Pollution Control Board

NOTICE OF FILING

TO : SEE ATTACHED SERVICE LIST .

PLEASE TAKE NOTICE that on October 2, 2006, we filed the attached Pre-Filed

Testimony of Louis Kollias On Behalf Of The Metropolitan Water Reclamation District of

Greater Chicago In Support Of Proposed Amendments To Dissolved Oxygen Standard with

the Clerk of the Pollution Control Board, a copy of which is herewith served upon you .

METROPOLITAN WATER RECLAMATION

DISTRICT F GREATER CHICAGO

Subscribed and Sworn to

Before me this

2nd

day of

October, 2006

.

By: ~,

Frederick M . Feldman, Its Attorney

47

MWRDGC

Frederick M . Feldman

Ronald M. Hill

Margaret T. Conway

100 East Erie

Chicago, IL 60611

(312) 751-6587 telephone

(312) 751-6598

CERTIFICATE OF SERVICE

1, IJVP

r>,

(k

LI

R ,

being duly sworn on oath, certify that I caused a copy of the

above(lVotice and

attached Pre-Filed Testimony , of Louis Kollias On Behalf Of The

Metropolitan Water Reclamation District of Greater Chicago In Support Of Proposed

Amendments To Dissolved Oxygen Standard to be sent via first-class U

.S. Mail to the

individuals identified on the attached service list, at their address as shown, with proper postage

prepaid, from 100 East Erie Street, Chicago, Illinois, at or near the hour of 4:30

p.m. this 2 nd day

of October, 2006 .

ublic

OFFICIAL SEAL

T T CONWAY

STATE

tY-07-08

---

Office of the Attorney General

Interested Party

188 W

. Randolph, 20th Floor

Chicago, IL 60601

Gardner, Carton & Douglas

Interested Party

191 N . Wacker Drive, Suite 3700

Chicago, IL 60606-1698

Sonnenschein, Nath & Rosenthal

Interested Party

8000 Sears Tower

233 S . Wacker Drive

Chicago, IL 60606-6404

Illinois Environmental Regulatory Group

Interested Party

3150 Roland Avenue

Springfield, IL 62703

Thom Creek Basin Sanitary District

Interested Party

700 West End Avenue

Chicago Heights, IL 60411

Hedinger Law Office

Interested Party

2601 S

. Fifth Street

Springfield, IL 62703

Fred L. Hubbard, Attorney at Law

Interested Party

16 West Madison, P .O. Box 12

Danville, IL 61834-0012

Illinois Pollution Control Board

Interested Party

100 W . Randolph Street, Suite 11-500

Chicago, IL 60601

SERVICE LIST

Bloomington/Normal Water Reclamation District

Interested Party

P.O. Box 3307

2

IEPA

Respondent

1021 N. Grand Avenue East

P.O. Box 19276

Springfield, IL 62794-9276

Hodge, Dwyer, Zeman

Interested Party

3150 Roland Avenue

P .O. Box 5776

Springfield, IL 62705-5776

Ross & Hardies

Interested Party

150 N . Michigan Avenue, Suite 2500

Chicago, IL 60601-7567

Chemical Industry Council of Illinois

Interested Party

2250 E . Devon Avenue, Suite 239

Des Plaines, IL 60018-4509

American Water Company

Interested Party

727 Craig Road

St. Louis, MO 63141

Vermillion Coal Company

Interested Party

1979 Johns Drive

Glenview, IL 60025

Blackwell, Sanders, Peper, Martin LLP

Interested Party

4801 Main Street, Suite 1000

Kansas City, MO 64112

City of Joliet

Department of Public Works and Utilities

Interested Party

921 E. Washington Street

Joliet, IL 60431

Downers Grove Sanitary District

Interested Party

2710 Curtiss Street

---

Bloomington, IL 61702-3307

Fox Metro Water Reclamation District

Interested Party

682 State Route 31

Oswego, IL 60543

Dr. Thomas J. Murphy

Interested Party

2325 N . Clifton Street

Chicago, IL 60614

Environmental Law & Policy Center

Interested Party

35 E. Wacker, Suite 1300

Chicago, IL 60601

Office of Lt. Governor Pat Quinn

Interested Party

Room 214 State House

Springfield, IL 62706

City of Geneva

Interested Party

22 South First Street

Geneva, IL 60134-2203

Friends of the Chicago River

Interested Party

22 South First Street

Geneva, IL 60134-2203

3

Downers Grove, IL 60515

Illinois Department of Natural Resources

Interested Party

One Natural Resources Way

Springfield, IL 62702-1271

Barnes & Thornburg

Interested Party

I N. Wacker, Suite 4400

Chicago, IL 60606

Evanston Environment Board

Interested Party

223 Grey Avenue

Evanston, IL 60202

Ecological Monitoring and Assessment

Interested Party

3206 Maple Leaf Drive

Glenview, IL 60025

Brown, Hay & Stephens LLP

Interested Party

700 First Mercantile Bank Building

205 South Fifth Street

P.O. Box 2459

Springfield, IL 62705-2459

Richard J . McGill, Jr., Hearing Officer

Illinois Pollution Control Board

100 West Randolph Street, Suite 11-500

Chicago, IL 60601

---

ILLINOIS POLLUTION CONTROL BOARD

RECEIVED

CLERK'S

OFFICE

IN THE MATTER OF

)

OCT 0

2

2006

STATE OF ILLINOIS

PROPOSED AMENDMENTS TO R04-25

)

R04-25

Pollution Control Board

DISSOLVED OXYGEN STANDARD

)

(Rulemaking -

Water)

35 ILL . ADM . CODE 302 .206

PRE-FILED TESTIMONY OF LOUIS KOLLIAS ON BEHALF OF THE

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

IN SUPPORT OF PROPOSED AMENDMENTS TO DISSOLVED OXYGEN STANDARD

My name is Louis Kollias

. I am the Director of Research and Development (R&D) for the Metropolitan

Water Reclamation District of Greater Chicago ("District")

. I am submitting the following testimony on

behalf of the District in support of the subject proposed amendments to the dissolved oxygen standards

for General Use waters in Illinois

.

I have been the Director of R&D since June 2006

. Prior to that, I had been Assistant Chief Engineer in the

District's R&D Department since January 2003

. As Director of R&D, I supervise the District's R&D

Department, which has a staff of 317

. I have been employed by the District since 1977

.

I hold a Bachelor of Science Degree in Civil Engineering from the Illinois Institute of Technology

. I am a

Licensed Professional Engineer in the State of Illinois and a Board Certified Environmental Engineer in

the American Academy of Environmental Engineers

. I am also currently the President of the Illinois

Water Environment Association .

My responsibilities as the District's Director of R&D include, but are not limited to, the following

:

•

Control of commercial and industrial waste discharges to the District's sewers and the waterways via

the Sewage and Waste Control Ordinance

;

•

Recovery of certain District operating, maintenance, and replacement costs via administration of the

User Charge Ordinance ;

•

Providing analytical laboratory support for the control of commercial and industrial wastes and for

control of treatment and other operations ;

•

Monitoring the water quality of Lake Michigan, Chicago area waterways, and the Illinois Waterway

;

and

•

Conducting basic and applied research on new wastewater and sludge treatment processes

.

The District previously submitted comments in support of the proposed amendments to 35 Ill

. Adm

. Code

302.206

. This testimony is being submitted to address certain other testimony that has been filed, and to

provide information concerning continuous dissolved oxygen (DO) monitoring and how such monitoring

results in Chicago area waterways would have complied with the proposed standards

.

---

The District appreciates the opportunity to express its views on the pending rulemaking for a DO water

quality standard . We will address three areas :

1 . Comment on the testimony of Thomas J . Murphy .

2. Complexity and cost of conducting the District's continuous DO monitoring program .

3. Compliance with proposed DO standards in Chicago area waterways .

Comment on the Testimony of Thomas J. Murphy

The testimony of Thomas J . Murphy, Ph .D., is very critical of the USEPA (1986) National Criteria

Document and at the same time does not properly acknowledge the current data and research that have

been considered for this proposed amendment to the DO standard . The 1986 document is a foundation

and guideline from which current data and research have been used to substantiate the proposed

amendment.

The USEPA (1986) criteria document noted that a select committee of scientists, established by the

Research Advisory Board of the International Joint Commission, reviewed DO criterion for the Great

Lakes

. The Commission concluded that a simple criterion based on dissolved oxygen concentration (an

average criterion of 6 .5 mg/L and a minimum criterion of 5 .5 mg/L) was preferable to one based on

percent saturation (or oxygen partial pressure) and was scientifically sound because the rate of oxygen

transfer across fish gills is directly dependent on the mean difference in oxygen partial pressure across the

gill and this is directly proportional to dissolved oxygen concentration

. Also, the total amount of oxygen

delivered to the gills is a more specific limiting factor than is oxygen partial pressure

per se . The USEPA

agreed with this conclusion .

In the article by Davis (1975, page 2298) that is cited by Dr

. Murphy in his testimony, a statement is

made that, "It is more conventional for water quality or oceanographic purposes to express water oxygen

levels in terms of their concentration rather than partial pressure

." Davis goes on to state that partial

pressure, percent saturation, and concentration of dissolved oxygen are all interrelated

.

DO concentration in mg/L is easier and more practical to measure, and the vast majority of monitoring

data, and data in the scientific literature relating dissolved oxygen effects on fish communities are based

on this unit of measure. Since the preponderance of current field data and research demonstrates DO

concentration levels in mg/L can be correlated to fish population dynamics, then how is the use of this

parameter not scientifically sound? Using DO saturation by itself could result in situations of 100 percent

DO saturation at high

temperatures with concentrations that are still harmful to fish and invertebrates

. In

low temperatures DO saturation could be very low yet waters could still have sufficient concentrations of

DO to be nonlimiting to the aquatic ecosystem. Dr

. Murphy does not take into account the metabolic rates

of fish at different temperatures

. Fish do not require as much DO in colder conditions

. Davis (1975) states

that it must be emphasized that fish require both the correct oxygen tension (pressure) gradient to move

02

into the blood and sufficient oxygen concentration (amount per volume of water breathed) to fulfill the

requirements of metabolism

.

In addition to these points, DO concentration must be utilized in the standard because it is possible to

control DO concentration through management practices by supplemental aeration and other mechanical

means

. It is much more difficult to control oxygen tension, and oxygen saturation can be extremely

variable

. A standard based on DO concentration in mg/L is practical, easily understandable, and

scientifically defensible

. Dr. Murphy does not make a convincing case for the use of dissolved oxygen

saturation rather than dissolved oxygen concentration as the state standard

.

2

---

Comments on Continuous Dissolved Oxygen Monitoring Technical and Cost Issues

Selection of DO Monitoring Locations

In order to obtain quality DO data, a monitoring station must be located at a point that is representative of

the waterway DO throughout the station's cross-section. Many physical features such as mixing zones for

wastewater treatment plant outfalls, tributary confluences, CSO outfalls, instream structures that disrupt

flow, oxygen consuming sediment deposits, variability of phytoplankton oxygen production, and thermal

discharges can influence DO uniformity at a waterway monitoring location .

•

The first step in site location is to conduct grab sample DO surveys longitudinally throughout the

waterway system to be monitored to identify reaches where DO is consistently at or below the

applicable IPCB standard . Ideally, these surveys to identify low-DO reaches should continue for at

least one year in order to account for seasonal variability . Once these reaches have been identified,

cross-sectional (depth profile DO readings measured across a transect) are conducted at potential

monitoring locations to verify that DO is uniform across the channel transect . To verify continued

cross-sectional DO uniformity during the monitoring period these surveys must be repeated at least

two and preferably three times per year at each monitoring location . Cost of each of the District's

cross-sectional DO surveys is approximately $80 per monitoring location

.

• In urban areas, DO monitors must be protected from vandalism while deployed in the field

. This is

accomplished by placing the monitors in protective steel housings, typically eight inch diameter

vertical steel pipes with hinged lids secured by a lock

. The submerged portions of these housings are

perforated with numerous circular openings to allow water flow across the DO probe

. Probes

currently used to measure DO require water flow across the probe surface for accurate measurements

.

New optical DO probe technology has eliminated this flow requirement but these probes cost two to

three times as much as the ones they replace

. Because of the flow requirement by the DO probe,

monitors currently deployed by the District frequently record inconsistent DO readings in waterway

reaches that do not have continuous flow

.

•

Protective housings must also be placed in the waterway in such a way that they do not interfere with

commercial or recreational navigation, further limiting monitoring location choices

. Use of vertical

protective housings limits DO monitoring locations to waterway locations with sufficient depth that

have adjacent vertical steel or concrete walls (bridge supports) to which the housings can be attached

.

This limitation in locating the vertical protective housing may result in a DO monitoring location that

may, under certain conditions, be subject to interference from CSO discharges and/or disruptions in

flow patterns by instream structures

. Attachment of these housings to structures owned by public

agencies generally requires issuance of permits which can delay the installation process by months

.

•

An additional limitation on vertical protective housing location is that the housing must be placed in

an area that is accessible for routine servicing by field personnel

. While it is possible to install DO

monitors in protective housings on the bottom of a waterway using short, horizontally-placed pipe

sections secured to both banks by chains, this is a less than ideal monitoring location since it puts the

DO probe closer to oxygen-demanding sediment deposits which can affect the accuracy of DO

readings

. Protective housings installed horizontally on the waterway bottom, due to their weight, can

only be efficiently deployed and recovered by personnel on a boat using an electric winch

. Horizontal

monitor housings are not suitable for installation in small streams since equipment is accessible to

vandals who can wade in the stream .

3

---

•

Placement of vertical pipe protective housings in small streams presents problems with finding an

area with sufficient water depth, greater than six inches at low-flow, to submerge the DO probe

. The

protective housings are also at risk of being dislodged from their mountings by impacts from large

floating debris during high-flow events and from collisions with recreational or commercial vessel

traffic in the waterway

. Obstruction of the waterway by protective housings also can pose liability

issues for the installing entity from recreational users who claim injury from the installations

.

• Fabrication of the protective housings is done by skilled trades

. Cost for labor and materials to

fabricate a typical vertical protective housing is approximately $2,100

. Vertical protective housings

range between 15 and 30 feet in length and weigh between 350 and 650 pounds

. Installation of these

housings, therefore, requires heavy equipment and skilled-trades labor

. Installation cost for a typical

protective housing used in the District's monitoring program ranges between $1,500 and $2,100

.

Water Quality Monitors

The District currently utilizes 78 monitors in its Continuous DO Monitoring Program

. Each monitor,

with water temperature probe, costs approximately $3,500

. Each of these monitors must be equipped with

a DO, specific conductivity, and water temperature probe since DO readings are derived from inputs from

these three probes

. Individual probe costs are DO (including water temperature), $450

; specific

conductivity, $250.

Monitors are subject to operating temperature limits, which are satisfied as long as the monitor is

submerged in the waterway during field deployments

. Problems arise when the waterway DO monitoring

location selected is not deep enough to completely submerge the monitor

. Incomplete submergence can

expose the monitor to temperatures outside its factory specified operating range and may result in

erroneous DO readings or electronics failure

. At least two feet of depth in the waterway is required to

submerge the monitor, and it is rare to find smaller creeks with this depth near places where protective

housings can be mounted

.

Field Deployment and Laboratory Operations

•

In order to assure that the DO data collected meets data quality objectives, all field and laboratory

operations must follow procedures outlined in a Quality Assurance Project Plan (QAPP) and Standard

Operating Procedure (SOP)

. Development of these two documents cost the District approximately

$6,000 to $7,000

. The District's QAPP and SOP have been approved by IEPA

.

•

The manufacturer claims that monitors are capable of being deployed in the field for periods of up to

two months

. However, concerns with probe fouling, premature battery failure, data loss from

electronics failure, and availability of DO data for reports and compliance monitoring usually limit

deployment periods to one to two weeks

.

•

The District's monitoring program assigns two monitors to each waterway DO monitoring location

.

One monitor is deployed in the field for a period of one week while the second monitor is maintained

in the laboratory

.

•

Calibration, data downloading, and maintenance can be done in the field, thereby requiring only one

monitor per station but the field environment is poorly suited to the exacting procedures required to

maintain this precision equipment and does not assure that data quality objectives will be met

. The

value of laboratory maintenance and calibration of the monitors is supported by the fact that less than

5 percent of the District's DO monitoring data has been lost during eight years of monitoring

.

4

---

•

Between deployments the monitors remaining in the laboratory must be maintained and calibrated

daily to assure they are ready for deployment, and to minimize equipment failure in the field

.

Personnel cost to the District for these laboratory operations is approximately $5,000 per year per

monitor based on one-week deployment intervals

.

•

In order to calibrate each monitor for deployment and download stored data following field

deployment, a personal computer and proprietary software are required

. Cost for these items and

proprietary-connecting cables is approximately $1,000 to $1,500 .

•

To efficiently manage the downloaded DO data, an electronic database must be used

. Development

costs for a custom database to organize DO monitoring information range from $3,000 to $4,000

.

•

Consumable items, consisting of batteries to power the monitors and parts and supplies to clean and

maintain the monitors, cost the District approximately $700 per monitor per year

.

•

In the District's DO monitoring program, field operations consist of exchanging monitors deployed in

the field with laboratory calibrated monitors

. Field operations are conducted on a weekly schedule at

all monitoring locations .

•

Additional duties of the field operations personnel consist of examining the protective housings for

damage and removing debris accumulations that may impede water circulation through the housing

.

In some cases, large trees have become lodged on the protective housings during high flow events in

the waterway

. Equipment and personnel costs incurred during removal of this debris has not been

tabulated but can involve the use of heavy equipment

.

•

Access to the monitoring locations requires a boat for deep-draft waterways or a vehicle for shallow-

draft waterway sites

.

•

Annual cost to the District for field operations conducted by boat at each DO monitoring location is

approximately $21,000

. Cost for field operations at each shallow-draft waterway DO monitoring

location serviced by vehicle is approximately $9,000 per year

.

Data Review and Management

The District's DO monitoring QAPP requires that all DO data be reviewed before acceptance

. Each week

DO data from each monitor are evaluated against limits outlined in the QAPP before it is incorporated

into the DO monitoring database

. This database management and DO data review costs the District

approximately $800 per monitoring location per year

.

Overall Program Costs

The District currently maintains 32 monitoring locations in Chicago area waterways

. A total of 78

monitors are available for use at these 32 locations

. This includes two monitors per location for weekly

retrieval and deployment and the reminder available to substitute for monitors being serviced or repaired

and for those that fail the QA/QC procedures prior to deployment

. Sixteen of these installations monitor

land-accessible waterway monitoring locations, generally on the Des Plaines, Little Calumet, and Grand

Calumet River Systems

. Another 16 installations monitor boat-accessible waterway monitoring locations,

including the commercially navigable portions of the Chicago and Calumet River Systems

.

5

---

•

Total cost to install equipment at 16 land-accessible waterway DO monitoring locations was $74,805

.

Total annual program cost during 2005 for these 16 land-accessible waterway DO monitoring

locations was $243,469 .

•

Total cost to install equipment at 16 boat-accessible waterway DO monitoring locations was $64,833

.

Total annual program cost at these 16 boat-accessible DO monitoring locations during 2005 was

$436,336.

•

Total cost to install DO monitoring equipment at 32 DO monitoring locations which monitor

approximately 225 river miles in District waterways was $139,638

. Total annual monitoring cost at

these 32 locations during 2005 was $679,805 .

•

Total cost for the 78 monitors purchased for the monitoring program is $327,600

.

Comments onCompliance

of ChicagoArea

Waterways with Proposed DO Standards

As was mentioned in previous District testimony, the proposed DO standards include two sets of

standards, one for specific named rivers and streams referred to as

"(d) Other Dissolved Oxygen

Streams," and the other being all other waters in subsection (b).

The latter, subsection (b), is divided into

two time periods, (1) March through July and (2) August through February

. The standards for the March

through July period are similar to the current General Use DO standards, a minimum of (A) "5

.0 mg/L at

any time" and (B) "6

.0 mg/L as a daily mean averaged over 7 days

." The subsection (b) standards for

August through February include a minimum of (A) "3

.5 mg/L at any time," (B) "4

.0 mg/L as a daily

minimum averaged over 7 days," and (C) "5

.5 mg/L as a daily mean averaged over 30 days

."

In order to determine how Chicago area waterways would comply with the proposed standards, results of

hourly DO measurements from the District's Continuous Dissolved Oxygen Monitoring (CDOM)

Program are summarized in the following exhibits :

ExhibitIA.

Dissolved oxygen observations and summary at selected locations in shallow-draft reaches

of General Use Waters for August 2005 through February 2006

.

•

Eight of the twelve shallow water CDOM locations were 100 percent compliant with the proposed

DO standards

. These included the North Branch of the Chicago River at Central Park Avenue, the

Des Plaines River at Devon Avenue, Ogden Avenue, and Material Service Road, Salt Creek at Busse

Lake Dam, J . F

. Kennedy Boulevard, Thomdale Avenue, and Wolf Road

.

•

Locations not in 100 percent compliance were the Des Plaines River at Irving Park Road, the Little

Calumet River at Ashland Avenue and Wentworth Avenue, and the Grand Calumet River at Hohman

Avenue.

•

It should be noted that no data were available during August and September 2005 for three of the

stations that were 100 percent compliant

.

Exhibit 1B .

Dissolved oxygen observations and summary at selected locations in shallow-draft reaches

of General Use Waters for March 2006 through July 2006

.

•

Two of the twelve shallow water CDOM locations were 100 percent compliant with the proposed DO

standards

. These included the Des Plaines River at Ogden Avenue and Salt Creek at J

. F . Kennedy

Boulevard

.

6

---

• Three locations were not 100 percent compliant with the >_ 5 .0 mg/L standard, but were 100 percent

compliant with the 6

.0 mg/L 7-day Average of the Daily Mean standard . These were Salt Creek at

Busse Lake and Thomdale Avenue, and the Des Plaines River at Material Service Road .

•

Locations not in 100 percent compliance with either standard were the North Branch of the Chicago

River at Central Park Avenue, the Des Plaines River at Devon Avenue and Irving Park Road, Salt

Creek at Wolf Road, the Little Calumet River at Ashland Avenue and Wentworth Avenue, and the

Grand Calumet River at Hohman Avenue .

Exhibit 2A.

Dissolved oxygen observations and summary at selected locations in deep-draft reaches of

Chicago area waterways for August 2005 through February 2006 .

•

Five of the twenty locations were in 100 percent compliance with the proposed DO standards

. These

included the North Shore Channel at Foster Avenue, the Chicago River at Clark Street, the South

Branch of the Chicago River at Loomis Street, and the Little Calumet River at C&W Indiana Railroad

and Halsted Street

.

•

The Chicago Sanitary and Ship Canal at the B&O Central Railroad had 100 percent of its DO

observations ? 3

.5 mg/L and 100 percent of the 7-day daily minima were >_ 4

.0 mg/L, but only 85 .7

percent of the daily mean averages within the 30-day period were

? 5 .5 mg/L .

•

The Calumet-Sag Channel at Cicero Avenue had 100 percent of the 7-day daily minima

? 4 .0 mg/L

and 100 percent of the 30-day daily mean averages were

? 5 .5 mg/L, but only 99 .5 percent of the DO

concentrations were >_ 3 .5 mg/L.

•

The Calumet-Sag Channel at Route 83 had 100 percent of its 30-day daily mean averages >_ 5

.5 mg/L,

but only 99.2

percent of its DO concentrations were >_ 3 .5 mg/L and 97

.1 percent of the 7-day daily

minima were >_ 4.0 mg/L .

•

Twelve locations were less than 100 percent compliance for all three requirements

.

Exhibit 213.

Dissolved oxygen observations and summary at selected locations in deep-draft reaches of

Chicago area waterways for March 2006 through July 2006

.

•

One of the twenty locations was in 100 percent compliance with the proposed DO standards

. This was

the Chicago River at Clark Street.

•

Two locations were greater than the 6

.0 mg/L 7-day Average of the Daily Mean standard 100 percent

of the time, but had less than 100 percent of DO concentrations >_ 5 .0 mg/L

. These included the North

Shore Channel at Foster Avenue (99

.8 percent) and the North Branch of the Chicago River at

Addison Street (99 .6 percent) .

•

Seventeen locations were less than 100 percent compliance for both requirements

.

Calculation of 7-Dav Average Daily Minimum or Daily Mean

.

It was unclear as to what method to use to calculate both the 7-day daily minima during the August

through February period, and the 7-day daily mean for the March through July period

. Results were

calculated for one month during each period using a running average method and a weekly calendar day

7

---

method for the shallow-draft locations and for the deep-draft locations . These are shown in the following

exhibit for purposes of comparison of the two methods .

Exhibit3A

. Determination of compliance with proposed DO standards at selected locations in shallow-

draft reaches of General Use Waters from September 1 through September 30, 2005, using two methods

to calculate averages of 7-day daily minima .

•

Results using both methods were very similar for nine shallow-draft stream locations during

September 2005 .

Exhibit 3B

.,

Determination of compliance with proposed DO standards at selected locations in shallow-

draft reaches of General Use Waters from July I through July 31, 2006, using two methods to calculate

averages of 7-day daily means .

•

Results using both methods were very similar for 12 shallow-draft stream locations during July 2006

.

Exhibit 4A .

Determination of compliance with proposed DO standards at selected locations in deep-draft

reaches of Chicago area waterways from September 1 through September 30, 2005, using two methods to

calculate averages of 7-day daily minima .

•

Results using both methods were very similar for 20 deep-draft stream locations during September

2005.

Exhibit 4B .

Determination of compliance with proposed DO standards at selected locations in deep-draft

reaches of Chicago area waterways from July 1 through July 31, 2006, using two methods to calculate

averages of 7-day daily means .

•

Results using both methods were very similar for 20 deep-draft stream locations during July 2006

.

Conclusion:

Both the running average method and the calendar week method give very similar results

for calculating a 7-day daily minimum or 7-day daily mean DO value

. However, for consistency, one or

the other method should be recommended if the standards are accepted by the IPCB

. The same

clarification should be made to determine the 30-day average of daily means for the August through

February period

.

The following comments should also be considered by the Pollution Control Board prior to promulgation

of the final rule .

•

This testimony focuses on use of continuous monitoring to determine compliance with the proposed

standards

. However, in all likelihood this will not be the predominant method utilized throughout the

state to determine compliance

. The draft rule as it is currently written does not specify a minimum

frequency of monitoring requirement for either the sensitive period or the non-sensitive period

. The

final rule should address this .

•

The draft rule as it is currently written does not specify or offer guidance as to how many sample

points must be maintained to ensure compliance of a waterway segment, a river or stream, or an entire

river system with the DO standards . The final rule should address this

.

As was mentioned in the District's testimony at the April 25, 2006 hearing, actual monitoring using

continuous monitors gives us critical insight into the impact of a water quality standard proposal

. Before

8

---

adopting any proposal there must be a reasonable chance that compliance will occur

. It is suggested that

the Board give consideration to the following:

•

For urban-impacted and CSO-impacted streams, a waiver provision should be allowed for time for

further study of the affordability and feasibility of technology that must be installed for these streams

to come into compliance .

•

A separate wet weather standard applicable to the time following stormwater runoff that would allow

reduced DO levels for a limited period needs to be investigated .

In closing, several areas have been identified where the IDNR/IEPA proposal requires clarification and

scientific justification

. The District supports the promulgation of a scientifically sound standard with

clearly outlined requirements for compliance verification . The standard must acknowledge and address

the unique nature of urban waterways and provide flexibility to accommodate the anthropogenic factors

that impact DO and aquatic ecology in these systems .

Metropolitan Water Reclamation District

of Greater Chicago

By :

Louis

(

Kollias

h-tJtxt

.V 4~_

Director

Research and Development

October 2, 2006

Metropolitan Water Reclamation

District of Greater Chicago

100 East Erie St .

Chicago, Illinois 60611

312.751 .5190

9

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August 1, 2005

-

February 28, 2006

EXHIBIT IA

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN SHALLOW-DRAFT REACHES

OF GENERAL USE WATERS FROM AUGUST 2005 THROUGH FEBRUARY 2006

Location

Number

of

Observations

Percent

of

Concentration

> 3

.5 mg/L

Range

of Daily

Minima

Percent

of 7-Day

Minima

> 4

.0 mg/L

30-Day

Average of

Daily Mean

Percent of

30-Day

Average

?

5

.5 mg/L

North Branch Chicago River at Central Park Ave

.

4,920

100

.0

4

.7-14

.0

100

.0

9

.7

100

.0

Des Plaines River at Devon Ave

.

3,010

100

.0

7

.1-14

.5

100

.0

11

.7

100

.0

Des Plaines River at Irving Park Rd

.

4,921

98

.2

2

.9-13

.2

93

.3

9

.1

71

.4

Des Plaines River at Ogden Ave

.

4,947

100

.0

6

.0-14

.4

100

.0

10

.6

100

.0

Des Plaines River at Material Service Rd

.

2,002

100

.0

7

.8-14

.4

100

.0

13

.3

100

.0

Salt Creek at Busse Lake Dam

2,963

100

.0

8

.8-15

.0

100

.0

12

.4

100

.0

Salt Creek at J

. F

. Kennedy Blvd

.

4,860

100

.0

4

.6-11

.4

100

.0

8

.6

100

.0

Salt Creek at Thomdale Ave

.

4,936

100

.0

4

.5-11

.5

100

.0

8

.9

100

.0

Salt Creek at Wolf Rd

.

5,072

100

.0

4

.7-14

.5

100

.0

9

.9

100

.0

Grand Calumet River at Hohman Ave

.

1,346

28

.4

0

.1-1

.9

0

.0

2

.1

0

.0

Little Calumet River at Ashland Ave

.

5,087

82

.6

2

.1-12

.6

65

.3

7

.6

71

.4

Little Calumet River at Wentworth Ave

.

4,248

84

.3

1

.0-12

.3

58

.5

7

.3

66

.7

---

EXHIBIT IA (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN SHALLOW-DRAFT REACHES

OF GENERAL USE WATERS FROM AUGUST 2005 THROUGH FEBRUARY 2006

August 1 -August 31, 2005

Location

Number

of

Observations

Percent of

Concentration

> 3

.5 mg/L

Range

of Daily

Minima

Percent of

7-Day Minima

>_ 4

.0 mg/L

30-Day

Average of

Daily Mean

North Branch Chicago River at Central Park Ave

.

744

99

.9

4

.7-5

.9

100

.0

6

.1

Des Plaines River at Devon Ave

.

Des Plaines River at Irving Park Rd

.

No Data

578

84

.9

2

.9-4

.9

42

.1

4

.6

Des Plaines River at Ogden Ave

.

722

100

.0

6

.0-6

.7

100

.0

6

.8

Des Plaines River at Material Service Rd

.

Salt Creek at Busse Lake Dam

.

Salt Creek at J

. F

. Kennedy Blvd

.

No Data

No Data

712

100

.0

4

.7-5

.6

100

.0

7

.0

Salt Creek at Thomdale Ave

.

691

100

.0

4

.5-5

.6

100

.0

7

.2

Salt Creek at Wolf Rd

.

744

100

.0

4

.7-5

.9

100

.0

6

.3

Grand Calumet River at Hohman Ave

.

685

31

.7

0

.1-1

.4

0

.0

3

.2

Little Calumet River at Ashland Ave

.

743

41

.3

2

.1-3

.1

0

.0

3

.4

Little Calumet River at Wentworth Ave

.

744

57

.3

1

.0-3

.4

0

.0

3

.8

---

EXHIBIT 1A (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN SHALLOW-DRAFT REACHES

OF GENERAL USE WATERS FROM AUGUST 2005 THROUGH FEBRUARY 2006

September 1

-

September 30, 2005

Location

Number

of

Observations

Percent of

Concentration

> 3

.5 mg/L

Range

of Daily

Minima

Percent of

7-Day Minima

>_ 4

.0 mg/L

30-Day

Average of

Daily Mean

North Branch Chicago River at Central Park Ave

.

719

100

.0

5

.5-6

.4

100

.0

6

.4

Des Plaines River at Devon Ave

.

Des Plaines River at Irving Park Rd

.

No Data

720

100

.0

4

.4-5

.6

100

.0

5

.4

Des Plaines River at Ogden Ave

.

720

100

.0

6

.5-7

.3

100

.0

7

.4

Des Plaines River at Material Service Rd

.

Salt Creek at Busse Lake Dam

Salt Creek at J

. F

. Kennedy Blvd

.

No Data

No Data

589

100

.0

4

.6-6

.2

100

.0

7

.0

Salt Creek at Thomdale Ave

.

631

100

.0

4

.6-6

.1

100

.0

7

.4

Salt Creek at Wolf Rd

.

719

100

.0

5

.2-6

.7

100

.0

6

.8

Grand Calumet River at Hohman Ave

.

553

29

.8

0

.5-1

.9

0

.0

2

.5

Little Calumet River at Ashland Ave

.

720

53

.5

2

.6-3

.3

0

.0

3

.7

Little Calumet River at Wentworth Ave

.

720

67

.8

2

.6-3

.4

0

.0

4

.4

---

EXHIBIT IA (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN SHALLOW-DRAFT REACHES

OF GENERAL USE WATERS FROM AUGUST 2005 THROUGH FEBRUARY 2006

October 1

-

October 3

,

2005

North Branch Chicago River at Central Park Ave

.

744

100

.0

5

.8-8

.3

100

.0

7

.8

Des Plaines River at Devon Ave

.

130

100

.0

9

.3-9

.3

100

.0

9

.5

Des Plaines River at Irving Park Rd

.

743

100

.0

5

.8-8

.7

100

.0

7

.7

Des Plaines River at Ogden Ave

.

744

100

.0

7

.2-9

.7

100

.0

8

.9

Des Plaines River at Material Service Rd

.

107

100

.0

10

.5-10

.5

100

.0

12

.6

Salt Creek at Busse Lake Dam

82

100

.0

8

.8-8

.8

100

.0

9

.6

Salt Creek at J

. F

. Kennedy Blvd

.

681

100

.0

5

.3-6

.3

100

.0

6

.9

Salt Creek at Thomdale Ave

.

735

100

.0

5

.7-6

.5

100

.0

7

.4

Salt Creek at Wolf Rd

.

743

100

.0

6

.4-8

.4

100

.0

8

.0

Grand Calumet River at Hohman Ave

.

108

0

.0

0

.3-0

.3

0

.0

0

.5

Little Calumet River at Ashland Ave

.

744

88

.8

3

.1-7

.2

80

.0

5

.5

Little Calumet River at Wentworth Ave

.

744

93

.4

3

.1-7

.4

84

.0

6

.3

Number

Percent of

Range

Percent of

30-Day

Location

of

Concentration

of Daily

Minima

Average of

Observations

> 3

.5 mg/L

Minima

2 4

.0 mg/L

Daily Mean

---

EXHIBIT 1A (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN SHALLOW-DRAFT REACHES

OF GENERAL USE WATERS FROM AUGUST 2005 THROUGH FEBRUARY 2006

November 1

-

November 30, 2005

Location

Number

of

Observations

Percent of

Concentration

?

3

.5 mg/L

Range

of Daily

Minima

Percent of

7-Day Minima

> 4

.0 mg/L

30-Day

Average of

Daily Mean

North Branch Chicago River at Central Park Ave

.

722

100

.0

5

.6-11

.8

100

.0

9

.4

Des Plaines River at Devon Ave

.

720

100

.0

7

.1-11

.4

100

.0

9

.5

Des Plaines River at Irving Park Rd

.

721

100

.0

6

.7-10

.4

100

.0

9

.1

Des Plaines River at Ogden Ave

.

601

100

.0

8

.7-11

.8

100

.0

10

.5

Des Plaines River at Material Service Rd

.

720

100

.0

7

.8-12

.2

100

.0

11

.8

Salt Creek at Busse Lake Dam

721

100

.0

9

.2-12

.8

100

.0

11

.5

Salt Creek at J

. F

. Kennedy Blvd

.

721

100

.0

6

.7-8

.5

100

.0

8

.3

Salt Creek at Thomdale Ave

.

721

100

.0

6

.2-8

.4

100

.0

8

.3

Salt Creek at Wolf Rd

.

716

100

.0

7

.4-10

.3

100

.0

9

.7

Grand Calumet River at Hohman Ave

.

Little Calumet River at Ashland Ave

.

No Data

720

96

.0

3

.8-8

.2

79

.2

6

.5

Little Calumet River at Wentworth Ave

.

708

90

.1

2

.6-7

.7

75

.0

6

.3

---

EXHIBIT IA (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN SHALLOW-DRAFT REACHES

OF GENERAL USE WATERS FROM AUGUST 2005 THROUGH FEBRUARY 2006

December 1

-

December 31, 2005

Location

Number

of

Observations

Percent of

Concentration

> 3

.5 mg/L

Range

of Daily

Minima

Percent of

7-Day Minima

?

4

.0 mg/L

30-Day

Average of

Daily Mean

North Branch Chicago River at Central Park Ave

.

743

100

.0

11

.1-13

.1

100

.0

12

.2

Des Plaines River at Devon Ave

.

744

100

.0

12

.2-14

.5

100

.0

13

.5

Des Plaines River at Irving Park Rd

.

744

100

.0

10

.2-13

.1

100

.0

12

.1

Des Plaines River at Ogden Ave

.

744

100

.0

12

.9-14

.4

100

.0

14

.2

Des Plaines River at Material Service Rd

.

202

100

.0

13

.1-14

.3

100

.0

14

.6

Salt Creek at Busse Lake Dam

744

100

.0

12

.1-13

.2

100

.0

13

.1

Salt Creek at J

. F

. Kennedy Blvd

.

741

100

.0

7

.7-9

.4

100

.0

9

.0

Salt Creek at Thomdale Ave

.

742

100

.0

8

.3-9

.4

100

.0

9

.4

Salt Creek at Wolf Rd

.

Grand Calumet River at Hohman Ave

.

734

No Data

100

.0

11

.7-14

.5

100

.0

13

.9

Little Calumet River at Ashland Ave

.

Little Calumet River at Wentworth Ave

.

744

No Data

100

.0

10

.5-12

.6

100

.0

11

.8

---

EXHIBIT IA (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN SHALLOW-DRAFT REACHES

OF GENERAL USE WATERS FROM AUGUST 2005 THROUGH FEBRUARY 2006

January 1

-

January 31, 2006

Location

Number

of

Observations

Percent of

Concentration

> 3

.5 mg/L

Range

of Daily

Minima

Percent of

7-Day Minima

>_ 4

.0 mg/L

30-Day

Average of

Daily Mean

North Branch Chicago River at Central Park Ave

.

576

100

.0

11

.2-12

.4

100

.0

12

.2

Des Plaines River at Devon Ave

.

744

100

.0

10

.6-13

.8

100

.0

12

.7

Des Plaines River at Irving Park Rd

.

744

100

.0

10

.6-12

.7

100

.0

12

.0

Des Plaines River at Ogden Ave

.

744

100

.0

12

.3-13

.1

100

.0

12

.9

Des Plaines River at Material Service Rd

.

468

100

.0

11

.8-13

.0

100

.0

13

.5

Salt Creek at Busse Lake Dam

744

100

.0

13

.0-13

.5

100

.0

13

.4

Salt Creek at J

. F

. Kennedy Blvd

.

744

100

.0

9

.4-10

.2

100

.0

10

.6

Salt Creek at Thomdale Ave

.

744

100

.0

9

.6-10

.5

100

.0

11

.0

Salt Creek at Wolf Rd

.

Grand Calumet River at Hohman Ave

.

744

No Data

100

.0

11

.1-11

.8

100

.0

11

.8

Little Calumet River at Ashland Ave

.

744

100

.0

9

.7-11

.3

100

.0

10

.7

Little Calumet River at Wentworth Ave

.

660

100

.0

9

.7-11

.5

100

.0

10

.9

---

EXHIBIT IA (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN SHALLOW-DRAFT REACHES

OF GENERAL USE WATERS FROM AUGUST 2005 THROUGH FEBRUARY 2006

February 1

-

February 28, 2006

Location

Number

of

Observations

Percent of

Concentration

>_ 3

.5 mg/L

Range

of Daily

Minima

Percent of

7-Day Minima

?

4

.0 mg/L

30-Day

Average of

Daily Mean

North Branch Chicago River at Central Park Ave

.

672

100

.0

12

.5-14

100

.0

13

.9

Des Plaines River at Devon Ave

.

672

100

.0

12

.0-13

.6

100

.0

13

.4

Des Plaines River at Irving Park Rd

.

671

100

.0

12

.3-13

.2

100

.0

13

.1

Des Plaines River at Ogden Ave

.

672

100

.0

12

.7-14

.2

100

.0

13

.8

Des Plaines River at Material Service Rd

.

505

100

.0

12

.3-14

.4

100

.0

14

.0

Salt Creek at Busse Lake Dam

672

100

.0

13

.4-15

100

.0

14

.5

Salt Creek at J

. F

. Kennedy Blvd

.

672

100

.0

9

.5-11

.4

100

.0

11

.2

Salt Creek at Thomdale Ave

.

672

100

.0

9

.6-11

.5

100

.0

11

.7

Salt Creek at Wolf Rd

.

672

100

.0

11

.8-12

.5

100

.0

12

.7

Grand Calumet River at Hohman Ave

.

Little Calumet River at Ashland Ave

.

No Data

672

100

.0

10

.8-12

.4

100

.0

11

.9

Little Calumet River at Wentworth Ave

.

672

100

.0

10

.7-12

.3

100

.0

11

.9

---

March 1, 2006

-

July 31, 2006

EXHIBIT 1B

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN SHALLOW-DRAFT REACHES

OF GENERAL USE WATERS FROM MARCH 2006 THROUGH JULY 2006

Location

Number

of

Observations

Percent of

Concentration

> 5

.0 mg/L

7-Day

Average of

Daily Mean

Percent of

7-Day Average

?

6

.0 mg/L

North Branch Chicago River at Central Park Ave

.

3,671

83

.8

7

.8

62

.6

Des Plaines River at Devon Ave

.

3,666

81

.8

8

.0

74

.0

Des Plaines River at Irving Park Rd

.

3,669

82

.5

7

.8

68

.3

Des Plaines River at Ogden Ave

.

3,671

100

.0

9

.0

100

.0

Des Plaines River at Material Service Rd

.

3,563

97

.8

9

.8

100

.0

Salt Creek at Busse Lake Dam

3,670

99

.4

9

.7

100

.0

Salt Creek at J

. F

. Kennedy Blvd

.

3,670

100

.0

8

.7

100

.0

Salt Creek at Thomdale Ave

.

3,500

97

.7

8

.6

100

.0

Salt Creek at Wolf Rd

.

3,479

91

.0

8

.5

83

.6

Grand Calumet River at Hohman Ave

.

1,814

12

.8

2

.6

0

.0

Little Calumet River at Ashland Ave

.

3,672

62

.0

6

.8

55

.3

Little Calumet River at Wentworth Ave

.

3,502

63

.3

6

.9

53

.8

---

EXHIBIT IB (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN SHALLOW-DRAFT REACHES

OF GENERAL USE WATERS FROM MARCH 2006 THROUGH JULY 2006

March 1

-

March 3

2006

,

Location

Number

of

Observations

Percent of

Concentration

?

5

.0 mg/L

7-Day

Average of

Daily Mean

Percent of

7-Day Average

>_ 6

.0 mg/L

North Branch Chicago River at Central Park Ave

.

744

91

.7

11

.2

100

.0

Des Plaines River at Devon Ave

.

743

100

.0

11

.6

100

.0

Des Plaines River at Irving Park Rd

.

744

100

.0

11

.4

100

.0

Des Plaines River at Ogden Ave

.

744

100

.0

12

.1

100

.0

Des Plaines River at Material Service Rd

.

744

100

.0

12

.2

100

.0

Salt Creek at Busse Lake Dam

744

100

.0

12

.7

100

.0

Salt Creek at J

. F

. Kennedy Blvd

.

743

100

.0

11

.1

100

.0

Salt Creek at Thomdale Ave

.

575

100

.0

11

.2

100

.0

Salt Creek at Wolf Rd

.

744

100

.0

11

.5

100

.0

Grand Calumet River at Hohman Ave

.

Little Calumet River at Ashland Ave

.

No Data

744

99

.9

10

.9

100

.0

Little Calumet River at Wentworth Ave

.

743

100

.0

10

.9

100

.0

---

EXHIBIT 1B (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN SHALLOW-DRAFT REACHES

OF GENERAL USE WATERS FROM MARCH 2006 THROUGH JULY 2006

April 1

-

April 30, 2006

Location

Number

of

Observations

Percent of

Concentration

> 5

.0 mg/L

7-Day

Average of

Daily Mean

Percent of

7-Day Average

>_ 6

.0 mg/L

North Branch Chicago River at Central Park Ave

.

719

100

.0

9

.9

100

.0

Des Plaines River at Devon Ave

.

719

100

.0

9

.4

100

.0

Des Plaines River at Irving Park Rd

.

719

99

.9

9

.0

100

.0

Des Plaines River at Ogden Ave

.

719

100

.0

9

.8

100

.0

Des Plaines River at Material Service Rd

.

720

100

.0

10

.5

100

.0

Salt Creek at Busse Lake Dam

718

100

.0

10

.8

100

.0

Salt Creek at J

. F

. Kennedy Blvd

.

719

100

.0

9

.3

100

.0

Salt Creek at Thomdale Ave

.

719

100

.0

9

.4

100

.0

Salt Creek at Wolf Rd

.

719

10

.0

9

.4

100

.0

Grand Calumet River at Hohman Ave

.

Little Calumet River at Ashland Ave

.

No Data

720

97

.9

7

.9

100

.0

Little Calumet River at Wentworth Ave

.

610

100

.0

8

.4

100

.0

---

EXHIBIT iB (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN SHALLOW-DRAFT REACHES

OF GENERAL USE WATERS FROM MARCH 2006 THROUGH JULY 2006

May 1

-

May 31, 2006

Location

Number

of

Observations

Percent of

Concentration

> 5

.0 mg/L

7-Day

Average of

Daily Mean

Percent of

7-Day Average

>_ 6

.0 mg/L

North Branch Chicago River at Central Park Ave

.

744

81

.7

6

.8

80

.0

Des Plaines River at Devon Ave

.

742

95

.7

8

.7

100

.0

Des Plaines River at Irving Park Rd

.

744

95

.0

8

.3

96

.0

Des Plaines River at Ogden Ave

.

744

100

.0

9

.1

100

.0

Des Plaines River at Material Service Rd

.

744

100

.0

10

.1

100

.0

Salt Creek at Busse Lake Dam

744

100

.0

9

.8

100

.0

Salt Creek at J

. F

. Kennedy Blvd

.

744

100

.0

8

.5

100

.0

Salt Creek at Thomdale Ave

.

743

100

.0

8

.3

100

.0

Salt Creek at Wolf Rd

.

744

98

.9

8

.4

100

.0

Grand Calumet River at Hohman Ave

.

504

8

.9

2

.5

0

.0

Little Calumet River at Ashland Ave

.

744

75

.0

6

.2

60

.0

Little Calumet River at Wentworth Ave

.

685

75

.6

6

.4

78

.3

---

EXHIBIT 1B (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN SHALLOW-DRAFT REACHES

OF GENERAL USE WATERS FROM MARCH 2006 THROUGH JULY 2006

June 1

-

June 30, 2006

Location

Number

of

Observations

Percent of

Concentration

> 5

.0 mg/L

7-Day

Average of

Daily Mean

Percent of

7-Day Average

?

6

.0 mg/L

North Branch Chicago River at Central Park Ave

.

720

88

.9

5

.8

33

.3

Des Plaines River at Devon Ave

.

718

95

.8

6

.4

70

.8

Des Plaines River at Irving Park Rd

.

718

93

.5

6

.0

45

.8

Des Plaines River at Ogden Ave

.

720

100

.0

7

.4

100

.0

Des Plaines River at Material Service Rd

.

720

95

.4

7

.5

100

.0

Salt Creek at Busse Lake Dam

720

100

.0

7

.9

100

.0

Salt Creek at J

. F

. Kennedy Blvd

.

720

100

.0

7

.7

100

.0

Salt Creek at Thomdale Ave

.

720

96

.1

7

.5

100

.0

Salt Creek at Wolf Rd

.

682

87

.4

6

.5

82

.6

Grand Calumet River at Hohman Ave

.

566

21

.7

3

.5

0

.0

Little Calumet River at Ashland Ave

.

720

28

.2

4

.8

16

.7

Little Calumet River at Wentworth Ave

.

720

28

.3

4

.8

0

.0

---

EXHIBIT 1B (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN SHALLOW-DRAFT REACHES

OF GENERAL USE WATERS FROM MARCH 2006 THROUGH JULY 2006

July 1

-

July 3

2006

,

Location

Number

of

Observations

Percent of

Concentration

> 5

.0 mg/L

7-Day

Average of

Daily Mean

Percent of

7-Day Average

> 6

.0 mg/L

North Branch Chicago River at Central Park Ave

.

744

57

.7

5

.1

0

.0

Des Plaines River at Devon Ave

.

744

18

.8

3

.9

0

.0

Des Plaines River at Irving Park Rd

.

744

25

.3

4

.3

0

.0

Des Plaines River at Ogden Ave

.

744

99

.9

6

.6

100

.0

Des Plaines River at Material Service Rd

.

635

92

.6

8

.1

100

.0

Salt Creek at Busse Lake Dam

744

97

.0

7

.3

100

.0

Salt Creek at J

. F

. Kennedy Blvd

.

744

100

.0

7

.1

100

.0

Salt Creek at Thomdale Ave

.

743

92

.7

6

.9

100

.0

Salt Creek at Wolf Rd

.

590

62

.7

5

.6

21

.1

Grand Calumet River at Hohman Ave

.

744

8

.6

2

.1

0

.0

Little Calumet River at Ashland Ave

.

744

8

.9

4

.1

0

.0

Little Calumet River at Wentworth Ave

.

744

19

.1

4

.2

0

.0

---

August

2005

-

February 28, 2006

,

EXHIBIT 2A

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN DEEP-DRAFT REACHES OF

CHICAGO AREA WATERWAYS FROM AUGUST 2005 THROUGH FEBRUARY 2006

North Shore Channel at Main St

.

4,635

99

.7

3

.9-28

.3

98

.0

9

.7

100

.0

North Shore Channel at Foster Ave

.

4,960

100

.0

5

.0-8

.6

100

.0

7

.6

100

.0

North Branch Chicago River at Addison St

.

5,087

99

.0

3

.0-9

.7

95

.3

7

.4

85

.7

North Branch Chicago River at Fullerton Ave

.

5,085

97

.7

2

.4-9

.2

95

.9

7

.0

85

.7

North Branch Chicago River at Kinzie St

.

5,057

97

.7

2

.7-9

.8

91

.2

7

.0

85

.7

Chicago River at Clark St

.

4,981

100

.0

6

.5-11

.2

100

.0

9

.0

100

.0

South Branch Chicago River at Loomis St

.

5,086

100

.0

5

.4-10

.8

100

.0

8

.0

100

.0

Bubbly Creek at 36th St

.

4,838

83

.8

0

.0-12

.1

75

.2

6

.6

71

.4

Bubbly Creek at Interstate Highway 55

4,716

98

.7

2

.8-9

.5

94

.9

7

.3

85

.7

Chicago Sanitary & Ship Canal at Cicero Ave

.

4,870

98

.7

3

.4-9

.4

92

.6

6

.7

85

.7

Chicago Sanitary & Ship Canal at B&O Central R

.R

.

4,666

100

.0

4

.5-8

.4

100

.0

7

.0

85

.7

Chicago Sanitary & Ship Canal at Route 83

4,295

98

.7

3

.8-7

.8

99

.3

5

.9

57

.1

Chicago Sanitary & Ship Canal at Lockport Powerhouse

4,831

98

.2

3

.2-8

.0

90

.1

6

.0

57

.1

Des Plaines River at Jefferson St

.

4,724

99

.7

3

.6-9

.4

96

.2

7

.3

71

.4

Calumet-Sag Channel at Cicero Ave

.

5,088

99

.5

4

.1-10

.2

100

.0

7

.6

100

.0

Calumet-Sag Channel at 104th Ave

.

3,994

99

.3

3

.7-9

.5

97

.7

7

.2

85

.7

Calumet-Sag Channel at Route 83

5,088

99

.2

3

.4-10

.0

97

.1

7

.5

100

.0

Grand Calumet River at Torrence Ave

.

4,892

91

.5

1

.3-16

.1

75

.0

10

.0

85

.7

Little Calumet River at C&W Indiana R

.R

.

4,807

100

.0

5

.8-17

.4

100

.0

10

.6

100

.0

Little Calumet River at Halsted St

.

4,832

100

.0

5

.4-8

.9

100

.0

7

.6

100

.0

Percent

30-Day

Percent

Location

Number

Percent of

Range

of 7-Day

Average

of 30-Day

of

Concentration

of Daily

Minima

of Daily

Average

Observations

?

3

.5 mg/L

Minima

?

4

.0 mg/L

Mean

?

5

.5 mg/L

---

EXHIBIT 2A (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN DEEP-DRAFT REACHES OF

CHICAGO AREA WATERWAYS FROM AUGUST 2005 THROUGH FEBRUARY 2006

August 1

-

August 3

2005

,

North Shore Channel at Main St

.

425

100

.0

5

.8-6

.6

100

.0

7

.1

North Shore Channel at Foster Ave

.

627

100

.0

5

.2-6

.4

100

.0

6

.5

North Branch Chicago River at Addison St

.

744

93

.5

3

.0-5

.6

68

.0

5

.2

North Branch Chicago River at Fullerton Ave

.

741

85

.6

2

.4-5

.1

72

.0

4

.8

North Branch Chicago River at Kinzie St

.

744

85

.6

2

.7-5

.2

40

.0

4

.8

Chicago River at Clark St

.

637

100

.0

6

.5-8

.3

100

.0

7

.8

South Branch Chicago River at Loomis St

.

744

100

.0

5

.4-6

.4

100

.0

6

.4

Bubbly Creek at 36th St

.

494

22

.7

0

.6-1

.4

0

.0

2

.3

Bubbly Creek at Interstate Highway 55

542

90

.8

2

.8-5

.2

52

.9

5

.4

Chicago Sanitary & Ship Canal at Cicero Ave

.

744

91

.7

3

.4-5

.5

52

.0

5

.1

Chicago Sanitary & Ship Canal at B&O Central R

.R

.

494

100

.0

4

.5-5

.4

100

.0

5

.4

Chicago Sanitary & Ship Canal at Route 83

142

78

.2

3

.8-3

.8

0

.0

4

.1

Chicago Sanitary & Ship Canal at Lockport Powerhouse

575

84

.5

3

.2-4

.1

15

.8

4

.2

Des Plaines River at Jefferson St

.

576

97

.2

3

.6-4

.8

68

.4

4

.9

Calumet-Sag Channel at Cicero Ave

.

744

98

.5

4

.1-5

.8

100

.0

6

.2

Calumet-Sag Channel at 104th Ave

.

325

91

.7

3

.7-5

.2

66

.7

5

.1

Calumet-Sag Channel at Route 83

743

94

.8

3

.4-5

.9

80

.0

5

.9

Grand Calumet River at Torrence Ave

.

730

56

.6

1

.3-2

.3

0

.0

4

.2

Little Calumet River at C&W Indiana R

.R

.

489

100

.0

5

.8-7

100

.0

7

.4

Little Calumet River at Halsted St

.

489

100

.0

5

.4-6

.3

100

.0

6

.8

Number

Percent of

Range

Percent of

30-Day

Location

of

Concentration

of Daily

7-Day Minima

Average of

Observations

> 3

.5 mg/L

Minima

> 4

.0 mg/L

Daily Mean

---

EXHIBIT 2A (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN DEEP-DRAFT REACHES OF

CHICAGO AREA WATERWAYS FROM AUGUST 2005 THROUGH FEBRUARY 2006

September 1

-

September 30, 2005

Location

Number

of

Observations

Percent of

Concentration

> 3

.5 mg/l,

Range

of Daily

Minima

Percent of

7-Day Minima

>_ 4

.0 mg/L

30-Day

Average of

Daily Mean

North Shore Channel at Main St

.

586

100

.0

6

.2-7

.4

100

.0

7

.5

North Shore Channel at Foster Ave

.

718

99

.7

5-6

.1

100

.0

6

.6

North Branch Chicago River at Addison St

.

720

99

.7

4

.7-5

.8

100

.0

6

.2

North Branch Chicago River at Fullerton Ave

.

720

98

.9

4

.5-5

.4

100

.0

5

.6

North Branch Chicago River at Kinzie St

.

720

99

.6

4

.6-5

.1

100

.0

5

.6

Chicago River at Clark St

.

719

100

.0

7

.4-7

.9

100

.0

7

.9

South Branch Chicago River at Loomis St

.

720

100

.0

6

.2-6

.9

100

.0

6

.9

Bubbly Creek at 36th St

.

720

81

.3

2

.3-4

.4

33

.3

4

.3

Bubbly Creek at Interstate Highway 55

720

100

.0

5

.2-6

100

.0

6

.1

Chicago Sanitary & Ship Canal at Cicero Ave

.

720

100

.0

5

.4-6

.1

100

.0

6

.1

Chicago Sanitary & Ship Canal at B&O Central R

.R

.

548

100

.0

5

.3-5

.7

100

.0

5

.9

Chicago Sanitary & Ship Canal at Route 83

528

99

.4

4-5

.4

100

.0

5

.1

Chicago Sanitary & Ship Canal at Lockport Powerhouse

720

100

.0

4

.4-5

.1

100

.0

4

.9

Des Plaines River at Jefferson St

.

682

100

.0

4

.5-4

.9

100

.0

5

.1

Calumet-Sag Channel at Cicero Ave

.

719

100

.0

5

.5-6

.2

100

.0

6

.5

Calumet-Sag Channel at 104th Ave

.

719

100

.0

4

.7-6

.4

100

.0

6

.1

Calumet-Sag Channel at Route 83

719

100

.0

4

.7-6

.1

100

.0

5

.9

Grand Calumet River at Torrence Ave

.

565

87

.1

2

.7-4

.4

22

.2

6

.0

Little Calumet River at C&W Indiana R

.R

.

719

100

.0

6

.7-7

.4

100

.0

7

.6

Little Calumet River at Halsted St

.

720

100

.0

6-6

.6

100

.0

7

.0

---

October 1

-

October 31, 2005

EXHIBIT 2A (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN DEEP-DRAFT REACHES OF

CHICAGO AREA WATERWAYS FROM AUGUST 2005 THROUGH FEBRUARY 2006

Location

Number

of

Observations

Percent of

Concentration

?

3

.5 mg/L

Range

of Daily

Minima

Percent of

7-Day Minima

>_ 4

.0 mg/L

30-Day

Average of

Daily Mean

North Shore Channel at Main St

.

745

100

.0

6

.8-9

.0

100

.0

8

.3

North Shore Channel at Foster Ave

.

744

100

.0

6

.1-7

.2

100

.0

7

.2

North Branch Chicago River at Addison St

.

744

100

.0

5

.9-6

.9

100

.0

6

.8

North Branch Chicago River at Fullerton Ave

.

744

100

.0

5

.1-6

.2

100

.0

6

.1

North Branch Chicago River at Kinzie St

.

726

99

.4

4

.9-6

.2

100

.0

6

.3

Chicago River at Clark St

.

744

100

.0

7

.6-8

.8

100

.0

8

.6

South Branch Chicago River at Loomis St

.

741

100

.0

6

.2-7

.9

100

.0

7

.3

Bubbly Creek at 36th St

.

743

100

.0

4

.8-5

.7

100

.0

5

.6

Bubbly Creek at Interstate Highway 55

744

100

.0

5

.8-6

.8

100

.0

6

.7

Chicago Sanitary & Ship Canal at Cicero Ave

.

744

100

.0

4

.9-5

.7

100

.0

5

.7

Chicago Sanitary & Ship Canal at B&O Central R

.R

.

744

100

.0

5

.7-6

.3

100

.0

6

.3

Chicago Sanitary & Ship Canal at Route 83

744

100

.0

4

.6-5

.7

100

.0

5

.4

Chicago Sanitary & Ship Canal at Lockport Powerhouse

743

100

.0

4

.7-5

.6

100

.0

5

.4

Des Plaines River at Jefferson St

.

612

100

.0

5

.7-6

.5

100

.0

6

.6

Calumet-Sag Channel at Cicero Ave

.

744

100

.0

5

.7-6

.9

100

.0

6

.9

Calumet-Sag Channel at 104th Ave

.

743

100

.0

5

.3-6

.8

100

.0

6

.5

Calumet-Sag Channel at Route 83

744

100

.0

5

.5-6

.4

100

.0

6

.4

Grand Calumet River at Torrence Ave

.

744

96

.5

3

.5-7

.7

92

.0

7

.6

Little Calumet River at C&W Indiana R

.R

.

744

100

.0

7

.7-8

.8

100

.0

8

.6

Little Calumet River at Halsted St

.

744

100

.0

6

.4-7

.2

100

.0

7

.1

---

EXHIBIT 2A (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN DEEP-DRAFT REACHES OF

CHICAGO AREA WATERWAYS FROM AUGUST 2005 THROUGH FEBRUARY 2006

November 1

-

November 30, 2005

Location

Number

of

Observations

Percent of

Concentration

>_ 3

.5 mg/L

Range

of Daily

Minima

Percent of

7-Day Minima

?

4

.0 mg/L

30-Day

Average of

Daily Mean

North Shore Channel at Main St

.

720

100

.0

5

.1-9

.0

100

.0

7

.7

North Shore Channel at Foster Ave

.

721

100

.0

6

.3-7

.2

100

.0

7

.3

North Branch Chicago River at Addison St

.

721

100

.0

5

.7-7

100

.0

7

.0

North Branch Chicago River at Fullerton Ave

.

721

100

.0

5

.3-6

.7

100

.0

6

.6

North Branch Chicago River at Kinzie St

.

708

100

.0

5

.3-7

.4

100

.0

6

.7

Chicago River at Clark St

.

721

100

.0

7

.5-8

.6

100

.0

8

.3

South Branch Chicago River at Loomis St

.

721

100

.0

5

.9-8

100

.0

7

.4

Bubbly Creek at 36th St

.

721

100

.0

4

.7-9

.8

100

.0

9

.0

Bubbly Creek at Interstate Highway 55

549

100

.0

5

.5-7

.8

100

.0

7

.1

Chicago Sanitary & Ship Canal at Cicero Ave

.

515

100

.0

5

.4-6

.6

100

.0

6

.1

Chicago Sanitary & Ship Canal at B&O Central R

.R

.

721

100

.0

5

.8-7

.1

100

.0

7

.0

Chicago Sanitary & Ship Canal at Route 83

721

97

.1

4

.3-5

.8

100

.0

5

.7

Chicago Sanitary & Ship Canal at Lockport Powerhouse

634

100

.0

4

.7-6

.7

100

.0

6

.0

Des Plaines River at Jefferson St

.

696

100

.0

5

.8-7

.8

100

.0

7

.4

Calumet-Sag Channel at Cicero Ave

.

721

97

.9

5

.0-8

.0

100

.0

7

.1

Calumet-Sag Channel at 104th Ave

.

707

100

.0

5

.7-8

.4

100

.0

7

.5

Calumet-Sag Channel at Route 83

721

100

.0

5

.9-7

.6

100

.0

7

.4

Grand Calumet River at Torrence Ave

.

695

100

.0

7

.2-12

.5

100

.0

11

.1

Little Calumet River at C&W Indiana R

.R

.

695

100

.0

9

.0-11

.7

100

.0

10

.8

Little Calumet River at Halsted St

.

721

100

.0

5

.9-8

.2

100

.0

7

.4

---

EXHIBIT 2A (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN DEEP-DRAFT REACHES OF

CHICAGO AREA WATERWAYS FROM AUGUST 2005 THROUGH FEBRUARY 2006

December 1

-

December 31, 2005

Location

Number

of

Observations

Percent of

Concentration

>_ 3

.5 mg/L

Range

of Daily

Minima

Percent of

7-Day Minima

>_ 4

.0 mg/L

30-Day

Average of

Daily Mean

North Shore Channel at Main St

.

744

98

.1

3

.9-8

.1

88

.0

6

.7

North Shore Channel at Foster Ave

.

744

100

.0

7

.7-8

.6

100

.0

8

.6

North Branch Chicago River at Addison St

.

743

100

.0

7

.6-8

.2

100

.0

8

.3

North Branch Chicago River at Fullerton Ave

.

744

100

.0

7

.7-8

.4

100

.0

8

.3

North Branch Chicago River at Kinzie St

.

744

100

.0

7

.6-8

.6

100

.0

8

.4

Chicago River at Clark St

.

744

100

.0

8

.6-11

.2

100

.0

10

.3

South Branch Chicago River at Loomis St

.

744

100

.0

8

.1-9

.8

100

.0

9

.2

Bubbly Creek at 36th St

.

744

100

.0

8

.3-10

.6

100

.0

9

.6

Bubbly Creek at Interstate Highway 55

744

100

.0

8

.0-9

.5

100

.0

9

.1

Chicago Sanitary & Ship Canal at Cicero Ave

.

731

100

.0

6

.5-8

.2

100

.0

7

.7

Chicago Sanitary & Ship Canal at B&O Central R

.R

.

744

100

.0

7

.2-8

.2

100

.0

8

.0

Chicago Sanitary & Ship Canal at Route 83

744

100

.0

5

.8-7

.8

100

.0

7

.2

Chicago Sanitary & Ship Canal at Lockport Powerhouse

744

100

.0

6

.1-7

.1

100

.0

6

.9

Des Plaines River at Jefferson St

.

743

100

.0

7

.6-9

.0

100

.0

8

.8

Calumet-Sag Channel at Cicero Ave

.

744

100

.0

7

.9-9

.4

100

.0

8

.6

Calumet-Sag Channel at 104th Ave

.

84

100

.0

7

.2-7

.2

100

.0

7

.4

Calumet-Sag Channel at Route 83

745

100

.0

7

.1-10

.0

100

.0

8

.8

Grand Calumet River at Torrence Ave

.

744

100

.0

7

.8-11

.7

100

.0

11

.1

Little Calumet River at C&W Indiana R

.R

.

744

100

.0

10

.9-12

.4

100

.0

12

.0

Little Calumet River at Halsted St

.

744

100

.0

7

.4-8

.6

100

.0

8

.3

---

EXHIBIT 2A (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN DEEP-DRAFT REACHES OF

CHICAGO AREA WATERWAYS FROM AUGUST 2005 THROUGH FEBRUARY 2006

January 1

-

January 31, 2006

Location

Number

of

Observations

Percent of

Concentration

> 3

.5 mg/L

Range

of Daily

Minima

Percent of

7-Day Minima

> 4

.0 mg/L

30-Day

Average of

Daily Mean

North Shore Channel at Main St

.

743

100

.0

5

.6-9

.3

100

.0

8

.0

North Shore Channel at Foster Ave

.

744

100

.0

7

.5-8

.2

100

.0

8

.5

North Branch Chicago River at Addison St

.

744

100

.0

7

.6-8

.8

100

.0

8

.9

North Branch Chicago River at Fullerton Ave

.

743

100

.0

7

.3-8

.3

100

.0

8

.4

North Branch Chicago River at Kinzie St

.

743

100

.0

7

.3-8

.1

100

.0

8

.1

Chicago River at Clark St

.

744

100

.0

8

.3-9

.6

100

.0

9

.3

South Branch Chicago River at Loomis St

.

744

100

.0

8-8

.8

100

.0

8

.7

Bubbly Creek at 36th St

.

744

100

.0

7

.7-9

.2

100

.0

8

.5

Bubbly Creek at Interstate Highway 55

744

100

.0

7

.8-8

.5

100

.0

8

.4

Chicago Sanitary & Ship Canal at Cicero Ave

.

744

100

.0

6

.3-7

.6

100

.0

7

.3

Chicago Sanitary & Ship Canal at B&O Central R

.R

.

744

100

.0

6

.9-8

.3

100

.0

8

.1

Chicago Sanitary & Ship Canal at Route 83

744

100

.0

4

.4-6

.6

100

.0

6

.5

Chicago Sanitary & Ship Canal at Lockport Powerhouse

743

100

.0

5

.9-6

.9

100

.0

6

.8

Des Plaines River at Jefferson St

.

743

100

.0

7

.4-9

.3

100

.0

9

.1

Calumet-Sag Channel at Cicero Ave

.

744

100

.0

7

.7-8

.9

100

.0

8

.4

Calumet-Sag Channel at 104th Ave

.

744

100

.0

7

.8-9

.1

100

.0

8

.6

Calumet-Sag Channel at Route 83

744

100

.0

7

.6-9

.2

100

.0

8

.6

Grand Calumet River at Torrence Ave

.

743

100

.0

9

.7-13

.4

100

.0

13

.0

Little Calumet River at C&W Indiana R

.R

.

744

100

.0

12

.0-12

.8

100

.0

12

.6

Little Calumet River at Halsted St

.

742

100

.0

6

.7-7

.7

100

.0

7

.6

---

EXHIBIT 2A (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN DEEP-DRAFT REACHES OF

CHICAGO AREA WATERWAYS FROM AUGUST 2005 THROUGH FEBRUARY 2006

February 1

-

February 28, 2006

Location

Number

of

Observations

Percent of

Concentration

?

3

.5 mg/l,

Range

of Daily

Minima

Percent of

7-Day Minima

?

4

.0 mg/L

30-Day

Average of

Daily Mean

North Shore Channel at Main St

.

672

100

.0

16

.5-28

.3

100

.0

22

.7

North Shore Channel at Foster Ave

.

662

100

.0

7

.7-8

.6

100

.0

8

.8

North Branch Chicago River at Addison St

.

671

100

.0

8

.4-9

.7

100

.0

9

.4

North Branch Chicago River at Fullerton Ave

.

672

100

.0

8

.0-9

.2

100

.0

9

.2

North Branch Chicago River at Kinzie St

.

672

100

.0

8

.2-9

.8

100

.0

9

.1

Chicago River at Clark St

.

672

100

.0

9

.2-11

.1

100

.0

10

.7

South Branch Chicago River at Loomis St

.

672

100

.0

8

.7-10

.8

100

.0

9

.9

Bubbly Creek at 36th St

.

672

60

.4

0

.0-12

.1

63

.6

6

.9

Bubbly Creek at Interstate Highway 55

673

98

.5

4

.6-9

.4

100

.0

8

.6

Chicago Sanitary & Ship Canal at Cicero Ave

.

672

100

.0

7

.4-9

.4

100

.0

8

.6

Chicago Sanitary & Ship Canal at B&O Central R

.R

.

671

100

.0

7

.5-8

.4

100

.0

8

.5

Chicago Sanitary & Ship Canal at Route 83

672

100

.0

6

.6-7

.7

100

.0

7

.5

Chicago Sanitary & Ship Canal at Lockport Powerhouse

672

100

.0

6

.8-8

.0

100

.0

7

.7

Des Plaines River at Jefferson St

.

672

100

.0

8

.4-9

.4

100

.0

9

.4

Calumet-Sag Channel at Cicero Ave

.

672

100

.0

8

.2-10

.2

100

.0

9

.3

Calumet-Sag Channel at 104th Ave

.

672

99

.9

8

.2-9

.5

100

.0

9

.4

Calumet-Sag Channel at Route 83

672

100

.0

8

.3-10

.0

100

.0

9

.5

Grand Calumet River at Torrence Ave

.

671

100

.0

13

.9-16

.1

100

.0

17

.4

Little Calumet River at C&W Indiana R

.R

.

672

100

.0

12

.1-17

.4

100

.0

15

.0

Little Calumet River at Halsted St

.

672

100

.0

7

.7-8

.9

100

.0

8

.6

---

March 1, 2006

-

July 31, 2006

EXHIBIT 2B

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN DEEP-DRAFT REACHES OF

CHICAGO AREA WATERWAYS FROM MARCH 2006 THROUGH JULY 2006

Location

Number

of

Observations

Percent of

Concentration

> 5

.0 mg/L

7-Day

Average of

Daily Mean

Percent of

7-Day Average

?

6

.0 mg/L

North Shore Channel at Main St

.

3,502

97

.3

9

.3

95

.7

North Shore Channel at Foster Ave

.

3,513

99

.8

7

.7

100

.0

North Branch Chicago River at Addison St

.

3,505

99

.6

7

.5

100

.0

North Branch Chicago River at Fullerton Ave

.

3,502

90

.9

6

.6

52

.1

North Branch Chicago River at Kinzie St

.

3,671

92

.5

6

.7

56,9

Chicago River at Clark St

.

3,514

100

.0

8

.9

100

.0

South Branch Chicago River at Loomis St

.

3,670

98

.2

7

.2

93

.5

Bubbly Creek at 36th St

.

3,319

19

.9

3

.0

8

.1

Bubbly Creek at Interstate Highway 55

3,124

63

.6

5

.4

26

.9

Chicago Sanitary & Ship Canal at Cicero Ave

.

3,502

79

.9

6

.1

47

.9

Chicago Sanitary & Ship Canal at B&O Central R

.R

.

3,670

93

.8

6

.7

69

.1

Chicago Sanitary & Ship Canal at Route 83

3,189

49

.2

4

.9

30

.5

Chicago Sanitary & Ship Canal at Lockport Powerhouse

3,501

43

.9

5

.1

33

.3

Des Plaines River at Jefferson St

.

3,669

71

.6

6

.5

52

.0

Calumet-Sag Channel at Cicero Ave

.

3,669

84

.3

6

.6

59

.3

Calumet-Sag Channel at 104th Ave

.

3,033

76

.2

6

.3

44

.0

Calumet-Sag Channel at Route 83

3,670

74

.6

6

.3

39

.8

Grand Calumet River at Torrence Ave

.

3,359

50

.8

6

.3

29

.5

Little Calumet River at C&W Indiana R

.R

.

3,499

86

.1

8

.9

78

.6

Little Calumet River at Halsted St

.

3,669

97

.5

6

.7

79

.7

---

March 1

-

March 31, 2006

EXHIBIT 2B (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN DEEP-DRAFT REACHES OF

CHICAGO AREA WATERWAYS FROM MARCH 2006 THROUGH JULY 2006

Location

Number

of

Observations

Percent of

Concentration

> 5

.0 mg/L

7-Day

Average of

Daily Mean

Percent of

7-Day Average

> 6

.0 mg/L

North Shore Channel at Main St

.

743

100

.0

14

.8

100

.0

North Shore Channel at Foster Ave

.

586

100

.0

8

.2

100

.0

North Branch Chicago River at Addison St

.

744

100

.0

9

.2

100

.0

North Branch Chicago River at Fullerton Ave

.

744

98

.7

8

.4

100

.0

North Branch Chicago River at Kinzie St

.

744

100

.0

8

.5

100

.0

Chicago River at Clark St

.

744

100

.0

9

.8

100

.0

South Branch Chicago River at Loomis St

.

744

100

.0

8

.9

100

.0

Bubbly Creek at 36th St

.

744

44

.4

4

.5

36

.0

Bubbly Creek at Interstate Highway 55

744

86

.8

6

.8

72

.0

Chicago Sanitary & Ship Canal at Cicero Ave

.

744

100

.0

7

.5

100

.0

Chicago Sanitary & Ship Canal at B&O Central R

.R

.

744

100

.0

8

.3

100

.0

Chicago Sanitary & Ship Canal at Route 83

406

100

.0

7

.1

100

.0

Chicago Sanitary & Ship Canal at Lockport Powerhouse

744

100

.0

7

.3

100

.0

Des Plaines River at Jefferson St

.

744

100

.0

9

.1

100

.0

Calumet-Sag Channel at Cicero Ave

.

744

100

.0

9

.0

100

.0

Calumet-Sag Channel at 104th Ave

.

515

100

.0

9

.6

100

.0

Calumet-Sag Channel at Route 83

744

100

.0

9

.1

100

.0

Grand Calumet River at Torrence Ave

.

575

100

.0

13

.3

100

.0

Little Calumet River at C&W Indiana R

.R

.

744

100

.0

16

.2

100

.0

Little Calumet River at Halsted St

.

744

100

.0

8

.2

100

.0

---

April 1

-

April 30, 2006

EXHIBIT 2B (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN DEEP-DRAFT REACHES

OF

CHICAGO AREA WATERWAYS FROM MARCH 2006 THROUGH JULY 2006

Location

Number

of

Observations

Percent of

Concentration

>_ 5

.0 mg/L

7-Day

Average of

Daily Mean

Percent of

7-Day Average

?

6

.0 mg/L

North Shore Channel at Main St

.

719

90

.1

7

.0

79

.2

North Shore Channel at Foster Ave

.

719

100

.0

7

.9

100

.0

North Branch Chicago River at Addison St

.

719

100

.0

8

.0

100

.0

North Branch Chicago River at Fullerton Ave

.

719

93

.5

7

.1

87

.5

North Branch Chicago River at Kinzie St

.

719

93

.0

7

.4

100

.0

Chicago River at Clark St

.

719

100

.0

8

.9

100

.0

South Branch Chicago River at Loomis St

.

719

97

.2

7

.9

100

.0

Bubbly Creek at 36th St

.

551

24

.3

3

.0

0

.0

Bubbly Creek at Interstate Highway 55

377

56

.2

4

.5

0

.0

Chicago Sanitary & Ship Canal at Cicero Ave

.

719

80

.0

6

.4

58

.3

Chicago Sanitary & Ship Canal at B&O Central R

.R

.

718

99

.7

7

.7

100

.0

Chicago Sanitary & Ship Canal at Route 83

719

94

.9

6

.3

83

.3

Chicago Sanitary & Ship Canal at Lockport Powerhouse

718

93

.3

6

.0

58

.3

Des Plaines River at Jefferson St

.

718

99

.9

7

.6

100

.0

Calumet-Sag Channel at Cicero Ave

.

719

99

.9

6

.7

100

.0

Calumet-Sag Channel at 104th Ave

.

609

99

.7

6

.6

95

.0

Calumet-Sag Channel at Route 83

719

90

.4

6

.3

50

.0

Grand Calumet River at Torrence Ave

.

719

57

.6

5

.5

37

.5

Little Calumet River at C&W Indiana R

.R

.

718

100

.0

8

.4

100

.0

Little Calumet River at Halsted St

.

718

100

.0

6

.6

100

.0

---

May 1

-

May 31, 2006

EXHIBIT 2B (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN DEEP-DRAFT REACHES OF

CHICAGO AREA WATERWAYS FROM MARCH 2006 THROUGH JULY 2006

Location

Number

of

Observations

Percent of

Concentration

>_ 5

.0 mg/L

7-Day

Average of

Daily Mean

Percent of

7-Day Average

>_ 6

.0 mg/L

North Shore Channel at Main St

.

743

100

.0

9

.1

100

.0

North Shore Channel at Foster Ave

.

744

99

.2

7

.6

100

.0

North Branch Chicago River at Addison St

.

577

99

.0

7

.3

100

.0

North Branch Chicago River at Fullerton Ave

.

576

92

.2

6

.4

78

.9

North Branch Chicago River at Kinzie St

.

744

99

.6

6

.3

84

.0

Chicago River at Clark St

.

744

100

.0

8

.7

100

.0

South Branch Chicago River at Loomis St

.

744

100

.0

6

.7

100

.0

Bubbly Creek at 36th St

.

703

5

.7

2

.2

0

.0

Bubbly Creek at Interstate Highway 55

708

69

.4

5

.6

12

.0

Chicago Sanitary & Ship Canal at Cicero Ave

.

744

87

.4

5

.9

40

.0

Chicago Sanitary & Ship Canal at B&O Central R

.R

.

744

99

.9

6

.4

96

.0

Chicago Sanitary & Ship Canal at Route 83

744

36

.8

4

.8

0

.0

Chicago Sanitary & Ship Canal at Lockport Powerhouse

576

6

.8

4

.4

0

.0

Des Plaines River at Jefferson St

.

744

83

.7

6

.0

60

.0

Calumet-Sag Channel at Cicero Ave

.

744

87

.2

5

.9

48

.0

Calumet-Sag Channel at 104th Ave

.

577

80

.1

5

.5

0

.0

Calumet-Sag Channel at Route 83

743

75

.1

5

.5

16

.0

Grand Calumet River at Torrence Ave

.

744

16

.1

3

.6

0

.0

Little Calumet River at C&W Indiana R

.R

.

744

89

.9

7

.2

96

.0

Little Calumet River at Halsted St

.

744

99

.5

6

.3

92

.0

---

EXHIBIT 2B (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN DEEP-DRAFT REACHES OF

CHICAGO AREA WATERWAYS FROM MARCH 2006 THROUGH JULY 2006

June 1

-

June 30, 2006

Location

Number

of

Observations

Percent of

Concentration

?

5

.0 mg/L

7-Day

Average of

Daily Mean

Percent of

7-Day Average

> 6

.0 mg/L

North Shore Channel at Main St

.

721

97

.1

7

.8

100

.0

North Shore Channel at Foster Ave

.

720

100

.0

7

.4

100

.0

North Branch Chicago River at Addison St

.

721

99

.7

6

.5

100

.0

North Branch Chicago River at Fullerton Ave

.

720

85

.7

5

.6

0

.0

North Branch Chicago River at Kinzie St

.

720

84

.9

5

.7

0

.0

Chicago River at Clark St

.

720

100

.0

8

.8

100

.0

South Branch Chicago River at Loomis St

.

719

97

.5

6

.3

95

.8

Bubbly Creek at 36th St

.

720

12

.2

2

.7

0

.0

Bubbly Creek at Interstate Highway 55

552

38

.8

4

.6

0

.0

Chicago Sanitary & Ship Canal at Cicero Ave

.

720

42

.4

5

.0

20

.8

Chicago Sanitary & Ship Canal at B&O Central R

.R

.

720

84

.7

5

.6

29

.2

Chicago Sanitary & Ship Canal at Route 83

720

13

.5

4

.0

0

.0

Chicago Sanitary & Ship Canal at Lockport Powerhouse

719

0

.1

3

.8

0

.0

Des Plaines River at Jefferson St

.

719

38

.4

4

.8

0

.0

Calumet-Sag Channel at Cicero Ave

.

718

59

.3

5

.3

0

.0

Calumet-Sag Channel at 104th Ave

.

720

44

.9

5

.0

0

.0

Calumet-Sag Channel at Route 83

720

28

.5

4

.8

0

.0

Grand Calumet River at Torrence Ave

.

720

53

.9

5

.8

20

.8

Little Calumet River at C&W Indiana R

.R

.

719

48

.0

5

.0

0

.0

Little Calumet River at Halsted St

.

720

90

.1

5

.8

29

.2

---

July 1

-

July 31, 2006

EXHIBIT 2B (Continued)

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DISSOLVED OXYGEN OBSERVATIONS AND SUMMARY AT SELECTED LOCATIONS IN DEEP-DRAFT REACHES OF

CHICAGO AREA WATERWAYS FROM MARCH 2006 THROUGH JULY 2006

Location

Number

of

Observations

Percent of

Concentration

> 5

.0 mg/L

7-Day

Average of

Daily Mean

Percent of

7-Day Average

?

6

.0 mg/L

North Shore Channel at Main St

.

576

99

.8

7

.3

100

.0

North Shore Channel at Foster Ave

.

744

100

.0

7

.3

100

.0

North Branch Chicago River at Addison St

.

744

99

.2

6

.5

100

.0

North Branch Chicago River at Fullerton Ave

.

743

84

.9

5

.6

0

.0

North Branch Chicago River at Kinzie St

.

744

84

.8

5

.6

0

.0

Chicago River at Clark St

.

587

100

.0

8

.3

100

.0

South Branch Chicago River at Loomis St

.

744

96

.1

6

.3

72

.0

Bubbly Creek at 36th St

.

601

11

.1

2

.3

0

.0

Bubbly Creek at Interstate Highway 55

743

56

.9

4

.7

28

.0

Chicago Sanitary & Ship Canal at Cicero Ave

.

575

91

.3

5

.7

10

.5

Chicago Sanitary & Ship Canal at B&O Central R

.R

.

744

84

.5

5

.5

20

.0

Chicago Sanitary & Ship Canal at Route 83

600

18

.3

3

.4

0

.0

Chicago Sanitary & Ship Canal at Lockport Powerhouse

744

11

.0

3

.7

0

.0

Des Plaines River at Jefferson St

.

744

36

.0

4

.7

0

.0

Calumet-Sag Channel at Cicero Ave

.

744

74

.9

5

.9

48

.0

Calumet-Sag Channel at 104th Ave

.

612

65

.8

5

.6

40

.0

Calumet-Sag Channel at Route 83

744

78

.2

5

.7

32

.0

Grand Calumet River at Torrence Ave

.

601

34

.9

4

.5

0

.0

Little Calumet River at C&W Indiana R

.R

.

574

93

.4

6

.7

100

.0

Little Calumet River at Halsted St

.

743

97

.7

6

.5

76

.0

---

EXHIBIT 3A

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DETERMINATION OF COMPLIANCE WITH PROPOSED DO STANDARDS AT SELECTED LOCATIONS IN

SHALLOW-DRAFT REACHES OF GENERAL USE WATERS FROM SEPTEMBER 1 THROUGH SEPTEMBER 30, 2005

USING TWO METHODS TO CALCULATE AVERAGES OF 7-DAY DAILY MINIMA

Running Averages

of Daily Minima

Weekly Averages

of Daily Minima

Location

Percent

Number

of

of

Concentration

Range

Percent of

of

7-Day Daily

Daily

Minima

Range

Percent of

of

7-Day Daily

Daily

Minima

30-Day

Average

of Daily

Mean

Observations

?

3

.5 mg/L

Minima

>_

4

.0 mg/L

Minima

?

4

.0 mg/L

North Branch Chicago River at Central Park Ave

.

719

100

.0

5

.5-6

.4

100

.0

5

.8-6

.8

100

.0

6

.4

Des Plaines River at Devon Ave

.

Des Plaines River at Irving Park Rd

.

No Data

720

100

.0

4

.4-5

.6

100

.0

4

.4-6

.1

100

.0

5

.4

Des Plaines River at Ogden Ave

.

720

100

.0

6

.5-7

.3

100

.0

6

.6-7

.7

100

.0

7

.4

Des Plaines River at Material Service Rd

.

Salt Creek at Busse Lake Dam

Salt Creek at J

. F

. Kennedy Blvd

.

No Data

No Data

589

100

.0

4

.6-6

.2

100

.0

4

.6-6

.4

100

.0

7

.0

Salt Creek at Thomdale Ave

.

631

100

.0

4

.6-6

.1

100

.0

4

.6-6

.1

100

.0

7

.4

Salt Creek at Wolf Rd

.

719

100

.0

5

.2-6

.7

100

.0

5

.2-7

.1

100

.0

6

.8

Grand Calumet River at Hohman Ave

.

553

29

.8

0

.5-1

.9

0

.0

0

.4-1

.9

0

.0

2

.5

Little Calumet River at Ashland Ave

.

720

53

.5

2

.6-3

.3

0

.0

2

.7-3

.3

0

.0

3

.7

Little Calumet River at Wentworth Ave

.

720

67

.8

2

.6-3

.4

0

.0

2

.7-3

.5

0

.0

4

.4

---

EXHIBIT 3B

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DETERMINATION OF COMPLIANCE WITH PROPOSED DO STANDARDS AT SELECTED LOCATIONS IN

SHALLOW-DRAFT REACHES OF GENERAL USE WATERS FROM JULY 1 THROUGH JULY 31, 2006 USING

TWO METHODS TO CALCULATE AVERAGES OF 7-DAY DAILY MINIMA

Running Averages

of Daily Means

Weekly Averages

of Daily Means

Location

Percent

Number

of

of

Concentration

7-Day

Percent of

Average

7-Day Daily

of Daily

Mean

7-Day

Percent of

Average

7-Day Daily

of Daily

Mean

Observations

?

5

.0 mg/L

Mean

?

6

.0 mg/L

Mean

?

6

.0 mg/L

North Branch Chicago River at Central Park Ave

.

744

57

.7

5

.1

0

.0

5

.2

0

.0

Des Plaines River at Devon Ave

.

744

18

.8

3

.9

0

.0

3

.9

0

.0

Des Plaines River at Irving Park Rd

.

744

25

.3

4

.3

0

.0

4

.2

0

.0

Des Plaines River at Ogden Ave

.

744

99

.9

6

.6

100

.0

6

.6

100

.0

Des Plaines River at Material Service Rd

.

635

92

.6

8

.1

100

.0

7

.9

100

.0

Salt Creek at Busse Lake Dam

744

97

.0

7

.3

100

.0

7

.1

100

.0

Salt Creek at J

. F

. Kennedy Blvd

.

744

100

.0

7

.1

100

.0

6

.9

100

.0

Salt Creek at Thomdale Ave

.

743

92

.7

6

.9

100

.0

6

.8

100

.0

Salt Creek at Wolf Rd

.

590

62

.7

5

.6

21

.1

5

.6

25

.0

Grand Calumet River at Hohman Ave

.

744

8

.6

2

.1

0

.0

1

.9

0

.0

Little Calumet River at Ashland Ave

.

744

8

.9

4

.1

0

.0

4

.1

0

.0

Little Calumet River at Wentworth Ave

.

744

19

.1

4

.2

0

.0

4

.0

0

.0

---

EXHIBIT 4A

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DETERMINATION OF COMPLIANCE WITH PROPOSED DO STANDARDS AT SELECTED LOCATIONS IN DEEP-DRAFT

REACHES OF CHICAGO AREA WATERWAYS FROM SEPTEMBER 1 THROUGH SEPTEMBER 30, 2005 USING

TWO METHODS TO CALCULATE AVERAGES OF 7-DAY DAILY MINIMA

Running Averages

of Daily Minima

Weekly Averages

of Daily Minima

Location

Number

Percent of

of

Concentration

Range

Percent of

of

7-Day Daily

Daily

Minima

Range

Percent of

of

7-Day Daily

Daily

Minima

30-Day

Average

of Daily

Mean

Observations

>

3

.5 mg/L

Minima

?

4

.0 mg/L

Minima

>

4

.0 mg/L

North Shore Channel at Main St

.

586

100

.0

6

.2-7

.4

100

.0

6

.4-7

.5

100

.0

7

.5

North Shore Channel at Foster Ave

.

718

99

.7

5

.0-6

.1

100

.0

5

.3-6

.1

100

.0

6

.6

North Branch Chicago River at Addison St

.

720

99

.7

4

.7-5

.8

100

.0

4

.9-5

.9

100

.0

6

.2

North Branch Chicago River at Fullerton Ave

.

720

98

.9

4

.5-5

.4

100

.0

4

.6-5

.5

100

.0

5

.6

North Branch Chicago River at Kinzie St

.

720

99

.6

4

.6-5

.1

100

.0

4

.8-5

.1

100

.0

5

.6

Chicago River at Clark St

.

719

100

.0

7

.4-7

.9

100

.0

7

.4-8

.1

100

.0

7

.9

South Branch Chicago River at Loomis St

.

720

100

.0

6

.2-6

.9

100

.0

6

.4-7

.0

100

.0

6

.9

Bubbly Creek at 36th St

.

720

81

.3

2

.3-4

.4

33

.3

2

.3-4

.8

40

.0

4

.3

Bubbly Creek at Interstate Highway 55

720

100

.0

5

.2-6

.0

100

.0

5

.2-6

.4

100

.0

6

.1

Chicago Sanitary & Ship Canal at Cicero Ave

.

720

100

.0

5

.4-6

.1

100

.0

5

.5-6

.41

100

.0

6

.1

Chicago Sanitary & Ship Canal at B&O Central R

.R

.

548

100

.0

5

.3-5

.7

100

.0

5

.4-5

.8

100

.0

5

.9

Chicago Sanitary & Ship Canal at Route 83

528

99

.4

4

.0-5

.4

100

.0

4

.1-5

.3

100

.0

5

.1

Chicago Sanitary & Ship Canal at Lockport Powerhouse

720

100

.0

4

.4-5

.1

100

.0

4

.5-5

.1

100

.0

4

.9

Des Plaines River at Jefferson St

.

682

100

.0

4

.5-4

.9

100

.0

4

.6-5

.1

100

.0

5

.1

Calumet-Sag Channel at Cicero Ave

.

719

100

.0

5

.5-6

.2

100

.0

5

.5-6

.7

100

.0

6

.5

Calumet-Sag Channel at 104th Ave

.

719

100

.0

4

.7-6

.4

100

.0

4

.7-63

100

.0

6

.1

Calumet-Sag Channel at Route 83

719

100

.0

4

.7-6

.1

100

.0

4

.7-6

.1

100

.0

5

.9

Grand Calumet River at Torrence Ave

.

565

87

.1

2

.7-4

.4

22

.2

2

.9-4

.2

25

.0

6

.0

Little Calumet River at C&W Indiana R

.R

.

719

100

.0

6

.7-7

.4

100

.0

6

.8-7

.6

100

.0

7

.6

Little Calumet River at Halsted St

.

720

100

.0

6

.0-6

.6

100

.0

6

.1-7

.0

100

.0

7

.0

---

EXHIBIT 4B

METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO

DETERMINATION OF COMPLIANCE WITH PROPOSED DO STANDARDS AT

SELECTED LOCATIONS IN DEEP-DRAFT

REACHES OF CHICAGO AREA WATERWAYS FROM JULY 1 THROUGH JULY 31,

2006 USING TWO METHODS TO

CALCULATE AVERAGES OF 7-DAY DAILY MEANS

Running Averages

of Daily Means

Weekly Averages

of Daily Means

Location

Percent

Number

of

of

Concentration

7-Day

Average

of Daily

Mean

Percent of

7-Day Daily

Mean

?

6

.0 mg/L

7-Day

Average

of Daily

Mean

Percent of

7-Day Daily

Mean

?

6

.0 mg/L

Observations

?

5

.0 mg/L

North Shore Channel at Main St

.

576

99

.8

7

.3

100

.0

7

.4

100

.0

North Shore Channel at Foster Ave

.

744

100

.0

7

.3

100

.0

7

.2

100

.0

North Branch Chicago River at Addison St

.

744

99

.2

6

.5

100

.0

6

.3

100

.0

North Branch Chicago River at Fullerton Ave

.

743

84

.9

5

.6

0

.0

5

.5

0

.0

North Branch Chicago River at Kinzie St

.

744

84

.8

5

.6

0

.0

5

.6

0

.0

Chicago River at Clark St

.

587

100

.0

8

.3

100

.0

8

.2

100

.0

South Branch Chicago River at Loomis St

.

744

96

.1

6

.3

72

.0

6

.4

80

.0

Bubbly Creek at 36th St

.

601

11

.1

2

.3

0

.0

2

.4

0

.0

Bubbly Creek at Interstate Highway 55

743

56

.9

4

.7

28

.0

4

.9

20

.0

Chicago Sanitary & Ship Canal at Cicero Ave

.

575

91

.3

5

.7

10

.5

6

.1

25

.0

Chicago Sanitary & Ship Canal at B&O Central R

.R

.

744

84

.5

5

.5

20

.0

5

.6

20

.0

Chicago Sanitary & Ship Canal at Route 83

600

18

.3

3

.4

0

.0

3

.6

0

.0

Chicago Sanitary & Ship Canal at Lockport Powerhouse

744

11

.0

3

.7

0

.0

3

.9

0

.0

Des Plaines River at Jefferson St

.

744

36

.0

4

.7

0

.0

4

.8

0

.0

Calumet-Sag Channel at Cicero Ave

.

744

74

.9

5

.9

48

.0

5

.9

40

.0

Calumet-Sag Channel at 104th Ave

.

612

65

.8

5

.6

40

.0

5

.6

50

.0

Calumet-Sag Channel at Route 83

744

78

.2

5

.7

32

.0

5

.8

20

.0

Grand Calumet River at Torrence Ave

.

601

34

.9

4

.5

0

.0

4

.7

0

.0

Little Calumet River at C&W Indiana R

.R

.

574

93

.4

6

.7

100

.0

7

.0

100

.0

Little Calumet River at Halsted St

.

743

97

.7

6

.5

76

.0

6

.8

80

.0