Consent Decree Semi Annual Report_September 2011Masterpiece on the Mississippi
TO: The Honorable Mayor and City Council Members
FROM: Michael C. Van Milligen, City Manager
SUBJECT: Consent Decree Semiannual Report
DATE: September 15, 2011
Dubuque
hfril
All-Ametica City
III
2007
City Engineer Gus Psihoyos is submitting the EPA Consent Decree September 30,
2011 Semiannual Report.
Michael C. Van Milligen
MCVM:jh
Attachment
cc: Barry Lindahl, City Attorney
Cindy Steinhauser, Assistant City Manager
Gus Psihoyos, City Engineer
Masterpiece on the Mississippi
TO: Michael C. Van Milligen, City Manager
FROM: Gus Psihoyos, City Engineer
SUBJECT: Consent Decree Semiannual Report
DATE: September 12, 2011
INTRODUCTION
Dubuque
alimettacity
2007
The purpose of this memo is to seek approval for the Consent Decree September 30,
2011 Semiannual Report.
DISCUSSION
The purpose of this report is to satisfy Section VIII, Paragraph 25 of the Consent
Decree. Paragraph 25 requires the City to submit semiannual reports on March 31 and
September 30 after the Effective Date (June 27, 2011). The report includes summary
information regarding events and activities performed in the prior six months, or in the
case of this first semiannual report, activities performed since the Date of Lodging (April
25, 2011). Therefore, the "reporting period" refers to the time between April 25, 2011
and including August 31, 2011. Following this first semiannual report, the reporting
periods shall be September 1 through February 28 (29) and March 1 through August 31.
RECOMMENDATION
I recommend that the City Manager approve and sign the "certification" page of the
report (page 1 -1). Engineering staff will then submit the report to the Department of
Justice, Environmental Protection Agency, and Iowa DNR.
ACTION TO BE TAKEN
If necessary, please place the item on the agenda for the September 19, 2011 City
Council meeting. If approved or if this item does not need City Council approval, please
sign the "certification" on page 1 -1 and return to Todd Shoemaker in Engineering.
Prepared by: Todd Shoemaker, PE
Prepared for:
UNITED STATES
ENVIRONMENTAL
PROTECTION AGENCY,
UNITED STATES
DEPARTMENT OF JUSTICE
AND
IOWA
DEPARTMENT OF
NATURAL RESOURCES
Prepared by:
CITY OF DUBUQUE, IA
50 W 13th Street
Dubuque, IA 52001
Consent Decree
Semiannual Report
September 30, 2011
Consent Decree No. 2:11 -cv- 01011 -EJ M
September 12, 2011
Table of Contents
1.0 CERTIFICATION 1 -1
2.0 INTRODUCTION 2 -1
2.1 Background 2 -1
2.2 Purpose 2 -1
2.3 Report Summary 2 -1
3.0 SANITARY SEWER OVERFLOWS 3 -1
3.1 Sanitary Sewer Overflow Record 3 -1
3.2 SSO's Effect on Public Health and Water Quality 3 -1
3.3 Measures Enacted to Minimize Duration and Impact 3 -1
3.4 Measures Enacted to Stop the Overflow Event 3 -2
3.5 Measures Enacted to Prevent Another Recurrance 3 -2
3.6 Capturing Key Way Overflows 3 -2
3.7 Warning Sign Postings 3 -2
4.0 CONSTRUCTION UPGRADES 4 -1
4.1 Construction Upgrades 4 -1
4.1.1 North Fork Catfish Creek Interceptor 4 -1
4.1.2 Water & Resource Recovery Center 4 -2
4.1.2.1 Project Planning 4 -2
4.1.2.2 Current Project Status 4 -2
4.1.2.3 Biosolid Accumulation Prevention at the WRRC 4 -3
5.0 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) 5 -1
5.1 Summary of all NPDES Permit Requirement Information 5 -1
5.2 NPDES Violations at the WRRC During The Reporting Period 5 -1
5.2.1 NPDES Violation(s) Log 5 -1
5.2.2 Cause of NPDES Violations 5 -2
6.0 INFLOW & INFILTRATION REDUCTION PROGRAM 6 -1
6.1 Background 6 -1
6.2 Flow Metering 6 -1
6.2.1 Sewershed 11 6 -1
6.2.2 Sewershed 12 6 -1
6.3 Source Investigations 6 -1
6.3.1 Private Property Inspections 6 -1
6.3.2 Dye Testing 6 -2
i
6.3.3 Smoke Testing 6 -2
6.3.4 Manholes 6 -3
6.3.5 Sanitary Sewer 6 -3
6.4 Corrective Action Plan 6 -3
6.5 Implementation of Corrective Action Plan 6 -3
7.0 CMOM UPDATE 7 -1
7.1 The CMOM Program 7 -1
7.2 CMOM Implementation 7 -1
8.0 ASSESSMENTS AND ENGINEERING ANALYSES 8 -1
8.1 Sunset Park 8 -1
8.2 Historic Inspections 8 -1
TABLES
Table 2 -1. Organization of information required by the Consent Decree. 2 -2
Table 3 -1. Sanitary sewer overflows during the reporting period. 3 -1
Table 4 -1. Significant deadlines for the Water & Resource Recovery Center. 4 -2
Table 5 -1. Monthly operating reports submitted during 2011. 5 -1
Table 5 -2. NPDES violations during the reporting period. 5 -1
FIGURES
Figure 6 -1. Map of priority sewersheds for I &I investigation 6 -2
APPENDICES
Appendix A. Basement Backups Reported During the Period of Record
Appendix B. Sewershed 12 Preliminary Flow Metering Results
ii
1.0 Certification
I certify under penalty of law that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gather and evaluate the information submitted. Based on my directions and my inquiry
of the person or person who manage the system, or those persons directly responsible for
gathering the information, the information submitted is, to the best of my knowledge and belief,
true, accurate, and complete. I am aware that there are significant penalties for submitting false
information, including the possibility of fine and imprisonment for knowing violations.
Michael C. Van Milligen
City Manager
2.0 Introduction
2.1 BACKGROUND
The City of Dubuque, Iowa is under a Consent Decree according to Case 2:11 -cv- 01001 -EJM,
United States of America and the State of Iowa v. the City of Dubuque, IA (N.D. Iowa), Civil
Action Number 2008V00041, DOJ Case Number 90- 5 -1 -1- 09339.
The Consent Decree became effective on June 27, 2011 and requires the City to submit
semiannual reports to the Department of Justice (DOJ), Environmental Protection Agency (EPA)
and Iowa Department of Natural Resources (DNR).
2.2 PURPOSE
The purpose of this report is to satisfy Section VIII, Paragraph 25 of the Consent Decree.
Paragraph 25 requires the City to submit semiannual reports on March 31 and September 30 after
the Effective Date (June 27, 2011). The report includes summary information regarding events
and activities performed in the prior six months, or in the case of this first semiannual report,
activities performed since the Date of Lodging (April 25, 2011). Therefore, the "reporting
period" shall refer to the time between April 25, 2011 and including August 31, 2011. Following
this first semiannual report, the reporting periods shall be September 1 through February 28 (29)
and March 1 through August 31.
2.3 REPORT SUMMARY
Paragraph 25 of the Consent Decree requires the semiannual reports to include specific
information as well as a summary of the status and progress of all projects and programs required
by Sections V and VI of the Consent Decree. Table Table 2 -1 lists how the required information
is organized in this report.
Table 2 -1. Organization of information required by the Consent Decree.
Consent Decree
Paragraph
Summary of Requirement
Report Section
25(a)i
Sanitary Sewer Overflow (SSO) locations
3.1
25(a)ii
SSO duration of flows
3.1
25(a)iii
SSO estimated flow volume
3.1
25(a)iv
Waterbody downstream of SSO
3.1
25(a)v
Suspected cause of SSO
3.1
25(a)vi
SSO effect on public health and water quality
3.2
25(a)vii
Measures to minimize SSO
3.3
25(a)viii
Measures to stop SSO
3.4
25(a)ix
Measures to prevent recurrence of SSO and
milestones
3.5
25(b)i
Construction upgrades
4.0
25(b)ii
NPDES permit summary
5.1
25(b)iii
NPDES permit violations during reporting
period
5.2
8
Assessments and engineering analyses
8.0
9
Disposal of biosolids at WPCP
4.1.2.3
10(a)
Capture of overflow from Key Way Drive
manhole
3.6
10(b)
Posting of warning signs at SSO locations
3.7
11
Construction upgrade to WPCP
4.1.2
12(a)
North Fork Catfish Creek interceptor placed into
service
4.1.1
12(b)
I &I flow metering
6.2.2
12(c)
Flow meters installed in first sewershed during
2010
6.2.1
12(d)
I &I source identification
6.3
12(e)
I &I corrective action plan
6.4
12(f)
Implement I &I corrective actions
6.5
13(a)
Collection System Management, Operation, and
Maintenance plan (CMOM)
7.0
13(b)
Implement CMOM
7.2
14
Certify legal authority
Completed upon signing
of Consent Decree
15
Certify that Section V of Consent Decree has
been completed and placed into service
To be completed by June
30, 2016
16
Demonstrate all SSO and by- passes have been
eliminated
To be completed by June
30, 2017
17
If SSO or by -pass occurs, submit Remedial Plan
and Schedule
Only applicable after
June 30, 2017
18
If SSO or by -pass occurs due to O &M, submit
Remedial Plan and Schedule
Only applicable after
June 30, 2017
2 -2
3.0 Sanitary Sewer Overflows
3.1 SANITARY SEWER OVERFLOW RECORD
Two sanitary sewer overflows (SSO, Table 3 -1) occurred in the City of Dubuque during the
reporting period. Both SSOs were caused by approximately 14 inches of rain that fell within 12
hours on July 27 and 28, 2011 (the Dubuque -area flood of record). (For simplicity, this rainfall
event will be referred to the "July 28, 2011" rainfall throughout this report.) The City submitted a
report dated August 4, 2011 to the DOJ, EPA, and DNR to document this event and resulting
damage.
Table 3 -1. Sanitary sewer overflows during the reporting period.
SSO
#
Sewer-
shed
Street
Address
Start
Date
End
Date
Start
Time
End
Time
Overflow
Volume
Downstream
Waterbody
Suspected
Cause(s)
1
11
1010 W
Locust
on
Rosedale
7/27/11
7/28/11
7:30
PM
8:00
AM
Unknown
due to
extreme
rain event
Mississippi
River
I/I due to
extreme
rain event
2
8
2615
Kerper
Blvd.
7/28/11
7/29/11
8:30
PM
1:00
AM
Unknown
due to
extreme
rain event
Mississippi
River
I/I due to
extreme
rain event
Inflow and Infiltration
Numerous basement backups also occurred as a result of the July 28, 2011 rainfall. Appendix A
lists those backups that were reported to the City. Because these backups occurred on private
property, City staff was not able to collect data on the start and end date, start and end time, and
overflow volume. However, each backup reported in Appendix A are the result of the July 28,
2011 rainfall.
3.2 SSO'S EFFECT ON PUBLIC HEALTH AND WATER QUALITY
The two SSOs noted in Table 3 -1 occurred during the Dubuque -area flood of record and drained
into the street and storm sewer system. No effects on public health were reported, and visual
inspection at the downstream waterbodies (prior to discharge to the Mississippi River) showed
no sign of floating debris or offensive odors.
3.3 MEASURES ENACTED TO MINIMIZE DURATION AND IMPACT
The City minimized the duration and impact of the SSOs by capturing untreated wastewater and
transporting it to areas with sufficient excess capacity. At SSO #1, an estimated 198,000 gallons
of untreated wastewater was captured and transported by tankers to a sanitary sewer located at
North Crescent Ridge. At SSO #2, approximately 18,000 gallons of untreated wastewater was
3 -1
captured and transported to a sanitary sewer located at the Municipal Services Center 925 Kerper
Court. The volumes were estimated based on the number of tanker trucks filled for each
overflow.
3.4 MEASURES ENACTED TO STOP THE OVERFLOW EVENT
Similar to Section 3.3, the City was able to stop the overflow event by capturing and transporting
wastewater to areas with sufficient excess capacity. When sufficient capacity returned to the area
of each SSO, the City stopped capturing wastewater overflow, and the system returned to normal
flow conditions.
3.5 MEASURES ENACTED TO PREVENT ANOTHER RECURRANCE
SSO #1 occurred within Sewershed 11, which is the priority sewershed to the City as documented
in Paragraph 12 of the Consent Decree. As described in Section 6 of this report, the City is
actively investigating potential sources of stormwater inflow and infiltration in this sewershed.
Source identification will be complete by September 30, 2011 upon which a corrective action
plan will be developed per the Consent Decree.
This is the first time the City has experienced an SSO at location #2. It is likely that this overflow
occurred due solely to the extreme rainfall of July 28, 2011. City staff will observe this area
during future rainfall events to determine if this is a recurring problem or isolated incident.
3.6 CAPTURING KEY WAY OVERFLOWS
Paragraph 10 of the Consent Decree requires the City to capture all overflows from the manhole
located on Key Way Drive between 3500 Keymer Drive and 3507 Keystone Drive. An SSO did
not occur at this location during the reporting period, so it was not necessary to capture any
overflows.
3.7 WARNING SIGN POSTINGS
As documented in the August 4, 2011 report, SSO warning signs were not posted during the
reporting period at the two SSO locations. DNR staff waived the required warning signs for SSO
#1 and #2 due to the extreme rain event.
4.0 Construction Upgrades
4.1 CONSTRUCTION UPGRADES
The following paragraphs include a summary of the status and progress of all projects and
programs required of the Consent Decree.
4.1.1 North Fork Catfish Creek Interceptor
The City of Dubuque completed the North Fork Catfish Creek Interceptor in the fall of 2010.
This was a major sanitary sewer improvement project designed to eliminate bypass pumping of
untreated wastewater into the North Fork of Catfish Creek during significant rain events.
The City upgraded the sanitary sewer to eliminate the need to pump untreated wastewater into
the North Fork Catfish Creek during significant rains. Beginning in 1995, the City proactively
investigated the inflow of rain and infiltration of groundwater into the sanitary sewer system
including:
• Home/building inspections to check for illegal connections to the sewer system;
• Permanent and temporary flow monitoring;
• Smoke and dye testing to identify defects and cross - connections;
• Systematic inspection and rehabilitation/replacement of brick manholes;
• Routinely televising sewers to identify defects;
• Sewer flushing and cleaning as necessary; and
• Reconstruction and rehabilitation (lining) of deficient sewers.
While all of this work reduced extraneous (rain and groundwater) flow from getting into the
sanitary sewer, reduced wastewater treatment costs, and reduced the instances of bypass
pumping, it did not totally eliminate the need for bypass pumping.
In March of 2004, the City funded further evaluation of the North Fork Catfish Creek sanitary
sewer. Completed in April of 2005, the study recommended a $2.9 million project to replace the
existing 12 -inch diameter clay sewer with a 24 -inch diameter ductile iron sewer from University
Avenue to Key Way, an 18 -inch diameter sewer from Key Way to the NW Arterial, and a series
of improvement projects were programmed into the City's next five -year capital improvement
program budget adopted in March of 2005.
The project was constructed in three phases under three separate contracts. The DNR
issued construction permits for the North Fork Catfish Creek Sanitary Sewer Improvements
Project on May 11, 2009; July 26, 2009; and October 20, 2009 for Phase I, Phase II, and Phase
III, respectively. Construction of the improvements started in started in August 2009 and was
completed in September 2010. The $2.9 million combined construction project involved the
replacement of an existing 12 -inch diameter clay sanitary sewer with 8,100 feet of 24 -inch
4 -1
diameter ductile iron sewer and 2,900 feet of 18 -inch diameter ductile iron sewer. The City
Council accepted all three phases of the project on November 1, 2010.
4.1.2 Water & Resource Recovery Center
4.1.2.1 Project Planning
During its Fiscal Year 2006 goal setting process, the City Council listed the Water Pollution
Control Plant (WPCP) as one of its high priorities. City staff subsequently applied for a State
Revolving Fund (SRF) planning and design loan during the summer of 2006, and plant upgrades
were placed on the DNR Intended Use Plan schedule. Following public hearings and bidding
requirements, the Facility Plan was developed and approved by DNR. The facility's name was
also changed to the Water & Resource Recovery Center (WRRC).
In October 2008, the team of Strand Associates /IIW Engineers was approved by the City Council
to proceed with the design of the WRRC upgrades. The NPDES permit was issued by DNR staff
on April 1, 2010, and the plant construction permit was signed by DNR staff on April 5, 2010.
Following public bidding requirements, the City Council approved a contract, and the notice to
proceed was issued August 19, 2010. Table Table 4 -1 lists significant deadlines for the project
outlined in the selected contractor's bid.
Table 4 -1. Significant deadlines for the Water & Resource Recovery Center.
Deadline
Target Date
Digester Startup
4/2/2011
Sludge Processing Startup
8/12/2012
Excess Flow Equalization
6/20/2012
Aeration Tank Completion
2/19/2013
Final Clarifiers
4/8/2013
Substantial Completion
4/30/2013
Final Completion
10/1/2013
4.1.2.2 Current Project Status
On July 11, 2011 at approximately 6:10 A.M., a thunderstorm with winds of approximately 74
mph caused damage to two of the four digesters under construction. On July 28, 2011, the City
received more than 14 inches of rain in approximately twelve hours which caused considerable
damage to the WRRC construction site. The damage caused by each event and the City's
response were documented in separate reports to the EPA, DOJ, and DNR dated July 15, 2011
and August 4, 2011.
The City estimates a project delay of approximately three to four months beyond the final
completion date of October 1, 2013. The City will provide more precise revised project deadlines
by September 30, 2011, as requested by the DOJ letter to Ms. Jane McAllister dated August 31,
2011.
Through August 31, 2011, the project is in its 12th month of construction and work has been
started on all aspects of the project. At this point, City staff estimates the project is 25%
complete. The ultraviolet disinfection system was started in March 2011 and is operational.
4 -2
Work continues on the digesters and sludge processing complex. The construction of the fourth
primary clarifier has begun, and demolition of the primary clarifier domes is underway. In
addition to the digester structures, work is progressing on the piping associated with the digester
operation along with the installation of the many pumps and motors required for the process. A
bio- solids handling contract is being negotiated with Nutri -Ject Systems of Hudson, Iowa.
The Administration/Laboratory Building is moving forward with a completion date for the
laboratory projected for the end of December 2011. Upon completion of the laboratory addition,
the existing building will be totally renovated and placed into service. The
Administration/Laboratory Building will be a highly energy efficient building using plant
effluent to meet heating and cooling needs. The entire structure is highly insulated and will use a
minimum of energy for lighting, heating and cooling.
4.1.2.3 Biosolid Accumulation Prevention at the WRRC
The City operates the North Incinerator and two centrifuges to maintain proper sludge blanket
levels in the final clarifiers. In the event, the North Incinerator must be shut down for longer than
one week, the City would continue to operate the centrifuges and dispose of the sludge at the
Dubuque Area Metropolitan Sanitary Landfill. Based on past history, a worst -case complete
shutdown, repair and startup of the incinerator can take place in four to six weeks.
The supplier of new centrifuges for the plant upgrade is the same firm that has performed major
maintenance on the existing centrifuges. This firm has informed WRRC staff that they would be
available to assist should the City have a major breakdown of one or both of the operating
centrifuges.
Storage space for sludge will remain a challenge until portions of the new plant are brought
online. When sections of the reconstructed plant are brought into service, the City will be able to
use these areas to assist in WRRC sludge management.
5.0 National Pollutant Discharge Elimination
System (NPDES)
5.1 SUMMARY OF ALL NPDES PERMIT REQUIREMENT INFORMATION
NPDES Monthly Operating Reports (MOR) for the City of Dubuque WRRC were submitted on
the dates listed in Table 5 -1:
Table 5 -1. Monthly operating reports submitted during 2011.
Report
Date Submitted
January 2011
2/11/2011
February 2011
3/10/2011
March 2011
4/15/2011
April 2011
5/10/2011
May 2011
6/14/2011
June 2011
7/8/2011
July 2011
8/7/2011
On July 28, 2011, WRRC staff called the DNR Region 1 office to report the effects of the major
rain event. A follow -up email was sent July 29, 2011 to report the rain event as a possible Force
Majeure event with a mailed request sent August 4, 2011.
5.2 NPDES VIOLATIONS AT THE WRRC DURING THE REPORTING PERIOD
5.2.1 NPDES Violation(s) Log
The City of Dubuque WRRC had permit violations in July 2011 caused by the July 28, 2011
rainfall event. The permit violations are listed in Error! Reference source not found..
Table 5 -2. NPDES violations during the reporting period.
Date
Parameter
Permit
Limit
Reported
Amount
7/27/11
Daily Maximum Flow
23.24 MGD
26.58 MGD
7/28/11
Daily Maximum Flow
23.24 MGD
37.782 MGD
7/29/11
Daily Maximum Flow
23.24 MGD
26.268 MGD
Week of 7/22 — 7/28
7 -Day TSS
45 mg/L
71 mg /L
Week of 7/22 — 7/28
7 -Day TSS
6,500 pounds
14,270 pounds
July 2011
30 -Day Average TSS
30 mg /L
40 mg/L
July 2011
30 -Day Average TSS
4,333 pounds
5,346 pounds
5 -1
In addition to the permit violations caused by the rain event, one of the City's major pumping
stations (the Catfish Creek station) was flooded at approximately 12:00 A.M. on July 28, 2011.
The station was returned to service by 7:00 P.M. the same day.
5.2.2 Cause of NPDES Violations
On July 28, 2011, the City received more than 14 inches of rain in approximately twelve hours
and is now considered the flood of record in the Dubuque area. The City has documented this as
a Force Majeure event of which the consequences were beyond the control of the City. The
county of Dubuque in which he City is located has been declared both a State of Iowa and
Federal disaster area. DOJ has stated that this was a Force Majeure event.
6.0 Inflow & Infiltration Reduction Program
6.1 BACKGROUND
Prior to the reporting period, the City experienced several discharges of untreated or partially
treated wastewater. These events were caused by sharp increases in flow within the sanitary
sewer system during and immediately after a rainstorm. To better locate the sources of this issue,
the City placed flow meters throughout the city. Depending on location, the meters measured the
flow of water from each sewershed over a one to eleven month period of time. Five of the twelve
sewersheds were identified as receiving elevated flows during and directly after a precipitation
event. Under the Consent Decree, the City has agreed to investigate five sewersheds over the
next five years. The section below describes the City's progress in identifying I &I sources in the
five sewersheds (Figure 6 -1). [Please note the numbered "Areas" in Figure 6 -1 are numbered
differently than in Paragraph 12(b) of the Consent Decree but represent the same areas (i.e. Area
1 = Sewershed 11).]
6.2 FLOW METERING
6.2.1 Sewershed 11
The City conducted flow metering within Sewershed 11 (Area 1 in Figure 6 -1) during 2010. This
requirement of the Consent Decree was satisfied upon signing of the Consent Decree.
6.2.2 Sewershed 12
The City conducted flow metering within Sewershed 12 (Area 2 in Figure 6 -1) during 2011.
Preliminary flow metering results are presented in Appendix B.
6.3 SOURCE INVESTIGATIONS
6.3.1 Private Property Inspections
As of August 31, 2011, 95% of all properties in Sewershed 11 and 67% of all properties in
Sewershed 12 have been inspected. Private property inspections identify the roof drain discharge
location, the presence of any stairwell or driveway drains, and the presence of a sump pit/pump
on site. A passing inspection indicates no connections of clear water to the sanitary system. A
failed inspection indicates a connection of clear water directly into the sanitary system, which
may include roof drains connected to the sanitary sewer; a stairwell or driveway drain which is
connected to the building floor drain; or a sump pump which is plumbed directly to the sanitary
lateral or a floor drain within the building.
Each improper connection observed during a private property inspection results in a failure
notice. The property owner then has 30 days to correct the improper connection, at which point a
re- inspection of the property conducted to verify that the improper connection has been
6 -1
eliminated. If the improper connection has not been corrected, the City will pursue legal action
against the property owner to complete the necessary work.
Inflow & Infiltration Program
Sanitary Sewersheds To Be Inspected
Figure 6 -1. Map of priority sewersheds for I &I investigation.
6.3.2 Dye Testing
Dye testing has been performed in conjunction with private property inspections. The City uses
dye to identify downspout and exterior stairwell or driveway connections to the sanitary system.
6.3.3 Smoke Testing
The City has conducted smoke testing in Sewershed 11 to identify improper clear water
connections to the sanitary system and possible cracks, leaks or breaks in a property owner's
sanitary lateral. Smoke testing has been used for large commercial or educational buildings
where dye testing would not an efficient method of investigation. Smoke testing is scheduled for
late September in Sewershed 12.
6.3.4 Manholes
Each sanitary manhole within Sewershed 11 has been opened and recorded as concrete or brick.
Each brick manhole is rated based on its structural integrity and rate of infiltration (if observed).
This rating system will be used to prioritize the replacement of brick manholes with concrete
manholes. The location and type has been uploaded to the GIS database.
6.3.5 Sanitary Sewer
Approximately 85% of the public sanitary sewer within Sewershed 11 has been inspected using a
closed circuit television system. Any cracks, leaky joints, illegal lateral connections, and
damaged or broken pipes have been recorded. The severity of the structural degradation of each
pipe section will be rated based on severity. This rating system will be used to prioritize which
pipe sections are in need of immediate repair or replacement. The location of all infiltration
locations has been uploaded to the GIS database.
6.4 CORRECTIVE ACTION PLAN
As stated in Paragraph 12 of the Consent Decree, the City will develop a corrective action plan
for Sewershed 11. The City is evaluating the data collected from actions described in Section 6.3
and will submit a corrective action plan to EPA, DOJ, and DNR by December 31, 2011.
6.5 IMPLEMENTATION OF CORRECTIVE ACTION PLAN
As stated in Paragraph 12(f) of the Consent Decree, the City will implement the I &I corrective
actions pursuant to EPA and DNR approval of the plan discussed in Section 6.4. Completed
corrective actions will be detailed here in future semiannual reports.
7.0 CMOM Update
7.1 THE CMOM PROGRAM
The City of Dubuque's Capacity, Management, Operation and Maintenance Plan (CMOM)
provides a summary of its policies, procedures, practices, and responsibilities associated with its
sanitary sewer collection system. It is the blueprint for the City's managers and field workers to
better manage, operate, and maintain Dubuque's sanitary sewer collection system, investigate
capacity- constrained area, prevent SSOs, respond to SSOs that may occur, and plan for future
system expansion.
In compliance with the Consent Decree, the City will submit the CMOM to EPA, DOJ, and DNR
prior to September 23, 2011.
7.2 CMOM IMPLEMENTATION
The City developed the CMOM to serve as a "living" document. As required by Paragraph 13 of
the Consent Decree, the City will fully implement the CMOM within two calendar months after
receiving formal approval by EPA. However, as the City reviews its current procedures and
codes, the CMOM will be updated and new procedures implemented as needed. Any revisions to
the CMOM will be submitted to EPA, DOJ, and DNR for review and approval as required under
the Consent Decree.
8.0 Assessments and Engineering Analyses
During the current reporting period, the City initiated two additional phases of the I &I Program
beyond those required by the Consent Decree. Please refer to Section 6.0 of this report for a
full description of the I &I Program.
8.1 SUNSET PARK
City staff was informed by residents that numerous homes in the Sunset Park subdivision had
improper connections to the City's sanitary sewer system. As described in Section 6.2.1, private
property inspections were initiated to identify the roof drain discharge location, the presence of
any stairwell or driveway drains, and the presence of a sump pit /pump on site. A total of 152
additional inspections were conducted in this subdivision.
8.2 HISTORIC INSPECTIONS
Section 4.1.1 states that private property inspections were previously conducted in the areas that
drain to the North Fork Catfish Creek interceptor. Of those inspected, a total of 466 properties
failed the inspection. The City began a "historic inspection" phase during the reporting period to
determine if any of these previous failures had "re- connected" to the sanitary sewer system.
Unlike the Sewershed 11, 12 and Sunset Park inspections, the historic inspections were
conducted unannounced and without an appointment. This made it more difficult to conduct
inspections because many residents were not home, but more importantly did not allow "repeat
violators" from disconnecting from the sanitary system just for an inspection. Of the 466
previous failures, one hundred inspections were conducted and 15 of those 100 failed the
inspection again. As described in Section 6.3.1, the home owners were given 30 days to correct
the improper connection and schedule a reinspection.
Appendix A
Basement Backups Reported During the Reporting Period
i
Thirty basement backups were reported to the City as a result of the July 28, 2011 rainfall event.
The thirty addresses are listed in Table A -1. Because these backups occurred on private property,
City staff was not able to collect data on the start and end date, start and end time, and overflow
volume.
lance A
SSO #
-1. basement
Sewer-
sited
nac ups reported
Street Address
as
Start
Date
a result
I End
Date
01 the
I Start
Time
July La,
I End
Time
Lull ra
I Overflow
volume
luau event.
Downstream
Waterbodv
Suspected Caase(s)
1
ND*
11m w Zit St
Unknown the to extreme tail event
Mississippi River
111 due to extreme rain event
2
ND
36 W 4th St
Unknown the to extreme rain event
Mississippi River
I I due to extreme rain event
3
ND
86 W 5th St
Unknown the to extreme rain event
Mississippi River
11 due to extreme rain event
4
10
511 E 22nd St
Unknown due to extreme ran event
mississippi River
11 due to extreme rain event
5
10
102 E 28th St
Unknown the to extreme rail event
Mississippi River
1.1 due to extreme rain event
6
11
1723 N Algona St
Unknown the to extreme rain event
Mississippi River
I1 due to extreme ran event
7
ND
1854 Bennett St
Unknown the to extreme rain event
Mississippi River
I1 due to extreme rain event
8
11
1385 N Booth St
Unknown the to extreme ran event
Mississippi River
II due to extreme rain event
9
10
2160 Elm St
Unknown the to extreme ran event
Mississippi River
I1 due to extreme rain event
10
10
2440 Elm St
Unknown the to extreme ran event
Mississippi River
II due to extreme rain event
11
10
2717 Ekn St
Unknown the to extreme ran event
Mississippi River
I1 due to extreme rain event
12
8
2345 Garfield Ave
Unknown the to extreme rain event
Mississippi River
I3 due to extreme rain event
13
8
2365 Garfield Ave
Unknown the to extreme ran event
Mississippi River
11 due to extreme rain event
14
ND
1900 Hale St
Unknown the to extreme rain event
Mississippi River
11 due to extreme rain event
15
ND
1786 Jackson St
Unknown the to extreme ran event
Mississippi River
I1 due to extreme rain event
16
ND
2025 Jackson St
Unknown the to extreme rain event
Mississippi River
I1 due to extreme rain event
17
10
2529 Jackson St
Unknown the to extreme ram event
Mississippi Rjver
Ii due to extreme rain event
18
10
2606 Jackson St
Unknown the to extreme ran event
Mississippi River
II due to extreme rain event
19
10
2610 Jackson St
Unknown the to extreme ran event
Mississippi River
II due to extreme rain event
20
8
2615 Keeper St
Unknown the to extreme run event
Mississippi River
11 due to extreme rain event
21
5
3387 Kotberly St
Unknown the to extreme ran event
Mississippi River
IL due to extreme rain event
22
ND
1414 Langwotthy St
Unknown the to extreme rain event
Mississippi River
II due to extreme rain event
23
8
2375 Rhomberg Ave
Unknown the to extreme rain event
Mississippi River
11 due to extreme rain event
24
8
2405 Rhomberg Ave
Unknown the to extreme ran event
Mississippi River
11 due to extreme rain event
25
11
2150 Rosedale Ave
Unknown the to extreme rain event
Mississippi River
11 due to extreme rain event
26
6
365 Saunders St
Unknown the to extreme rain event
Mississippi River
I1 due to extreme rain event
27
ND
405 Southern Ave
Unknown the to extreme rain event
Mississippi River
I I due to extreme rain event
28
ND
1689 Washington St
Unknown the to extreme ran event
Mississippi River
I1 due to extreme rain event
29
10
2610 White St
Unknown the to extreme ran event
Mississippi River
II due to extreme rain event
30
10
2895 White St
Unknown the to extreme rain event
Mississippi River
II due to extreme rain event
' ND = Sewershed not delineated in this area
11
Appendix B
Sewershed 12 Preliminary Flow Metering Results
iii
i
v
x,
� x
RACE ST rn
BENNETT ST
HALE ST
S's
S % >1D
.OAP
N▪ f
Z
1st Street Basin
Su 'Vested Flow Meter Locations
6AS1 SS ; AS( ENa(gS gZ yy `k9yF
PNG `I A p d r 14 A E A3 NHS( `�
o ' �A� `
,� k
n N+ rS � r `9 ■ ¢ b9 SI
o 43L P
9i N�"' OWN
pa�`NO�O�gt �� CROP d+� � N �A��Ns om
Y ly Al
nG ZNUt SS % �9 CUSS 9 St
1. A 0 44
.� 5S n Aµ `a.
9� ..,; ti 1 ' '2 q(H R 9 Wx
A
J▪ �`. n tom, �PO,F ,� St p� E 1'6 S-
tH
N F
A N SS
��"y 12. • S �8
<V I,
q s N � d�N9t s0" ilG, li
M
✓ A r. .,s S` 3 HSi SS;�f
T.
T. • 9� 11 Z�H 'Po
�C}O +!I '� qty'
• b
• lP
°�• � t 12 - 5 Nf N
A N.A
CO
0
0
W 5TH Sr
ti
0
0
UI
z
F.
,An_ V, TERR ,1 h~ N,
1▪ )n
s
N-",
LANGWORTHyST
SOLON Sr
K 3RD ST
G WORrny sr
0
0
ffi
2,000,000
1,800,000
1,600,000
1,400,000
1,200,000
1,000,000
800,000
600,000
400,000
200,000
0
2nd Locust
Flow Monitoring #1 (2011)
6.0
Rf 0
N m
m 0
rl N
1 1
� V
N
- CO
rl r'1
In . In
in
N
in
Date
an
N
N
,D
N
Rainfall 11.11111.10Total Flow Dry Weather Flow
rn
0
N
1
600,000
500,000
400,000
rs
a300,000
200,000
100,000
0
10th Bluff
Flow Monitoring #2 (2011)
i.l
u I
1
m 1 rl N N — � N 4�D
M Q C i` Lf to
Date
4D
iI
tl1 N N 1 N N
tD IUD tD h
h h
— Rainfall
Total Flow AgivaleeDry Weather Flow
N
h
6.0
5.0
4.0
3.0 3
2.0
1.0
0.0
11
600,000
500,000
400,000
A
a
O.
0 •-•' 300,000
i
200,000
100,000
0
590 University
Flow Monitoring #3 (2011)
Date
Rainfall solmlefotal Flow 4■•••tDry Weather Flow
6.0
5.0
4.0
2.0
1.0
0.0
m
ri
111
350,000
300,000
250,000
200,000
150.000
100,000
50,000
221 St. Mary's
Flow Monitoring #4 (2011)
6.O
- 5.0
- 4.0
g
3.0
a
- 2.0
- 1.0
N 471 1-1 m to A
to t0 t0 tD D ▪ lD
N
N
�D
N
m
tf1
N
A
A
N
O 1
A
Date
✓ l
n
M
N
A
411
A
A
A
Now Rainfall ■•■=eTotal Flow 4••■•DryWeather Flow `
e1 M L!1
N N N
N N N
A
N
A
al
N m
1
A A
0.0
iv
2,000,000
1,800,000
1,600,000
1,400,000
1,200,000
a.
9-ipoo poo
800,000
600,000
400,000
200,000
535 Hill St
Flow Monitoring #5 (2011)
6.0
------ 5.0
4.0
3.0 ;
2.0
Date
I I■ Rainfall -Total Flow
Dry Weather Flow
V