Work Plan for Supplemental Engineering Project (SEP)Masterpiece on the Mississippi
TO: The Honorable Mayor and City Council Members
FROM: Michael C. Van Milligen, City Manager
SUBJECT: Work Plan for the Supplemental Engineering Project
DATE: July 14, 2011
Dubuque
bitill
NI- America City
Ill®
2007
City Engineer Gus Psihoyos recommends approval of a work plan for the Supplemental
Engineering Project (SEP) as required by the Consent Decree related to the City's
Wastewater Management System. This plan includes the selection of four alleys. One
of the unique aspects is that the surface portion of these four alleys will not be
assessable, however, utilities will be assessable.
I concur with the recommendation and respectfully request Mayor and City Council
approval.
MCVM:jh
Attachment
cc: Barry Lindahl, City Attorney
Cindy Steinhauser, Assistant City Manager
Gus Psihoyos, City Engineer
Michael C. Van Milligen
Masterpiece on the Mississippi
TO:
FROM: Gus Psihoyos, City Engineer .C7
SUBJECT: Work plan for the Supplemental Engineering Project
DATE: July 13, 2011
INTRODUCTION
Mike Van Milligen, City Manager
The purpose of this memo is to seek approval of a work plan for the Supplemental
Engineering Project (SEP) as required by the Consent Decree related to the City's
wastewater management system. Attached to this memo is the City's plan to
reconstruct four (4) alleys using permeable interlocking pavers to satisfy the SEP.
DISCUSSION
The Consent Decree requires the City to implement a SEP, which has the objective of
securing significant environmental or public health protection and improvements. The
work plan to implement the SEP must be submitted to the Environmental Protection
Agency (EPA) and Iowa Department of Natural Resources (DNR) within 30 days of the
effective date of the Consent Decree (July 27, 2011).
The permeable pavement design includes a 2 -foot thick stone sub -base that would
ensure the infiltration of stormwater. In addition to the permeable pavement, the aging
sanitary sewer main and service lines within the alley ROW will be replaced or relined,
although the cost of such replacement is not being included in the costs associated with
the SEP. Infiltration of stormwater reduces the runoff volume and peak discharge rate
that may reach the storm sewer system. The first -flush of pollutants is also reduced due
to filtering of the runoff through a stone and sand filter bed. Replacing or relining aged
sanitary sewer lines minimizes the infiltration of groundwater into the sanitary sewer
system which can contribute to sanitary sewer overflows.
Based on the consensus of the Housing, Public Works, and Engineering Departments
and the City Manager, the following alleys have been selected for the SEP.
• 16th Street to 17 Street, between Jackson Street and Washington Street. The
approximate length and width of the alley is 270 feet and 20 feet, respectively.
Dubuque
All- Amaicany
2007
• 17 Street to 18 Street, between Jackson Street and White Street. The
approximate length and width of the alley is 270 feet and 20 feet, respectively.
• 9 Street to 10 Street, between Jackson Street and White Street. The
approximate length and width of the alley is 225 feet and 15 feet, respectively.
• Dell Street to Prairie Street, between Loras Boulevard and Arlington Street. The
approximate length and width of the alley is 600 feet and 20 feet, respectively.
Due to the slope of the alley, approximately one -half will be permeable
pavement.
The total length of alleys is approximately 1,365 feet, of which approximately 1,100 will
be permeable pavement. The City has the necessary access rights to the stated alleys;
no additional easements or access authorizations are necessary.
RECOMMENDATION
I recommend that the City Manager approve the SEP work plan as outlined in the
attached document.
ACTION TO BE TAKEN
I respectfully request approval of the attached work plan for the SEP as required by the
Consent Decree related to the City's wastewater management system.
Cc: Barry Lindahl
Deron Muerhring
Don Vogt
John Klosterman
Jon Brown
Jon Dienst, PE
Todd Shoemaker, PE
Attachments: Work Plan: Supplemental Engineering Project
Prepared by: Todd Shoemaker, PE
2
Prepared for:
UNITED STATES
ENVIRONEMTNAL
PROTECTION
AGENCY
AND
IOWA
DEPARTMENT OF
NATURAL RESOURCES
Prepared by:
CITY OF DUBUQUE, IA
50 W 13 Street
Dubuque, IA 52001
Supplemental
Engineering
Project
Work Plan
July 13, 2011
TABLES
FIGURES
F: \TShoemaker\ConsentDecree \SEP \Work Plan Rev5.doc
Table of Contents
i
1.0 CERTIFICATION 1 -1
2.0 INTRODUCTION 2 -2
3.0 DESCRIPTION OF THE PROJECT 3 -3
3.1 Project Description 3 -3
3.2 Selected Alleys 3 -4
3.3 Anticipated Cost 3 -9
3.4 Timeline and Report 3 -9
3.5 Acknowledgement 3 -9
Table 3 -1. Summary of probable costs for the SEP. 3 -9
Figure 3 -1. Typical permeable pavement cross - section. 3 -3
Figure 3 -2. Location map of E 16th St / E 17th St alley 3 -5
Figure 3 -3. Location map of E 17th St / E 18th St alley 3 -6
Figure 3 -4. Location map of 9th St /10 St alley 3 -7
Figure 3 -5. Location map of Prairie St / Dell St alley. 3 -8
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
Section X of Case 2:1 l -cv -0l 001 -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 requires the City of Dubuque (City) to implement a Supplemental Engineering Project
(SEP), which has the objective of securing significant environmental or public health protection
and improvements. Under the SEP, the City has agreed to reconstruct four (4) alleys using
permeable interlocking pavers.
Construction of permeable paver alleys will reduce the volume and peak flow of runoff to the
Mississippi River while also reducing the pollutant load associated with stormwater runoff.
Replacing the aged sanitary sewer line and services will reduce the infiltration of stormwater into
the sanitary sewer system which can lead to sanitary sewer overflows.
3.2 SELECTED ALLEYS
Based on the consensus of the Housing, Public Works, and Engineering Departments and the
City Manager, the following alleys have been selected for the SEP.
• 16 Street to 17 Street, between Jackson Street and Washington Street (Figure 3 -2). The
approximate length and width of the alley is 270 feet and 20 feet, respectively.
• 17 Street to 18 Street, between White Street and Jackson Street (Figure 3 -3). The
approximate length and width of the alley is 270 feet and 20 feet, respectively.
• 9 Street to 10 Street, between White Street and Jackson Street (Figure 3 -4). The
approximate length and width of the alley is 225 feet and 15 feet, respectively.
• Prairie Street to Dell Street, between Arlington Street and Loras Boulevard (Figure 3 -5).
The approximate length and width of the alley is 600 feet and 20 feet, respectively. Due
to the slope of the alley, approximately one -half will be permeable pavement.
The total length of alleys is approximately 1,365 feet, of which approximately 1,100 will be
permeable pavement. The City has the necessary access rights to the stated alleys; no additional
easements or access authorizations are necessary.
3.0 Description of the Project
3.1 PROJECT DESCRIPTION
The SEP involves the reconstruction of four (4) alleys in the City of Dubuque (City) using
permeable interlocking concrete pavers. The identified alleys are approximately 270 feet or
longer and 20 feet wide. The permeable pavement design includes a 2 -foot thick stone sub -base
that would ensure the infiltration of stormwater (Figure 3 -1). In addition to the permeable
pavement, the aging sanitary sewer main and service lines within the alley ROW will be replaced
or relined, although the cost of such work is not being included in the costs associated with the
SEP.
0
2' (TYP)
GEOTECHNICAL FABRIC
(12' MIN,)
NOTE;
1. CONCRETE COLLARS SHOULD HAVE A MINIMUM SLOPE OF 0.5%
CONCRETE COLLAR SHALL MATCH EXISTING ELEVATION AT R.O.W.
PERMEABLE CONCRETE BLOCK PAVERS (3 118` DEPTH)
T (TYP)
VARLS
VA
R�S
SEE VARIES VARIES SEE
NO TE�1, 155 (
1' N .- -1
•
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ET " '1
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tiltIitn60 (W,' 3 4' Ct FAN STONF)
ALTERNATE 1:
PERMEABLE BLOCK PAVEMENT
PROPOSED TYPICAL SECTION - ALLEY LOCATION 15 TH - 16 TH
STA; 20 +82 TO STA; 23 +44
F.C.C. CONCRETE COLLAR FOR
PERMEABLE BLOCK PAVERS
(SFF NOTE 1)
4' OF ASTM NO. 57 STONE
(BASE COURSE)
12'OF ASTM N
(SUBBASE COURSE)
SUBGRADE (SLOPE 1% TO CENTER)
2' OF ASTM NO. 8 STONE
(BEDDING COURSE)
Figure 3 -1. Typical permeable pavement cross - section.
Infiltration of stormwater reduces the runoff volume and peak discharge rate that may reach the
storm sewer system. The first -flush of pollutants is also reduced due to filtering of the runoff
through a stone and sand filter bed. Replacing aged sanitary sewer lines minimizes the
infiltration of groundwater into the sanitary sewer system which can contribute to sanitary sewer
overflows.
a cst .1 ...w, Clv
n w..��ay+ro M..c
C. c aim. and IrWarroallon aubllahla.C.Ilt and
ypw do not roman, ��TM c and r.n<m
Mal ....r
. r wen mod h l .. . n n or
. n.n, w .r m. .ana..e<. u,..,rw1,1d ..r
Proposed Permeable Pavement Alley
between 16th St l 17th St and ackson St / Was hzn
100 50 0 Feet
Map Prepared by:
City of Dubuque
Engineering Dbision
50 West 13th Street
Dubuque, bwa 52001
Phone: (563) 589 -4270
Fax: (563) 589 -4205
Figure 3 -2. Location map of E 16th St / E 17th St alley.
3 -5
oda& lino Rau,. A.& Co.0 Inhomo anon Do /No.
csl ,w n..a.. an. ro.<N et
Oulaad000 and ala.W ca..ti lo onolano hod Ma&
11u Crn alCoutuou& and I.O.W. &I ur..or
ro ypw
...lino
a....
or .noh, M .m .r , er r` or
Urearadolablon
Proposed Permeable Pavement Alley
100
between 17th St / 18th St and White St I Tackson St
50
0 Feet
Map Prepared by:
City of Dubuque
Engineering Dhision
50 West 13th Street
Dubuque, bwa 52001
Phone: (563) 589 -4270
Fax: (563) 589 -4205
Figure 3 -3. Location map of E 17th St / E 18th St alley.
3 -6
Proposed Permeable Pavement Alley
between 9th St 1 10th St and White St 1 Jackson St
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nu Ch. o/Cuta.qua
•.•..
�.ps/In
Marna, n. dala "...led Ian. Cll., and ..i.k
wS»» .otir a..,o � ew.
Figure 3 -4. Location map of 9 St /10 St alley.
100 50 O F eet
3 -7
W E
Map Prepared by:
City of Dubuque
Engineering O ision
50 West 13th Street
Dubuque, bwa52001
Phone: (563) 589 -4270
Fax: (563) 589 -4205
waaiunca:rr.. WOW C rn. w....orI
am nryaw. 1.,.a Man
¢vcsi .«.. 111.41.. data ..w.a su m. m. C. a.
ae.,u. ft d ..
ypw m va u er amid,..
Ma�lna
Manahan a i I
any
.,«r R.N. .
o
..•h. ue M. a.a.a unauHVe ••m.. /
Proposed Permeable Pavement Alley
between Pnzirie St 1 Dell St and Arlin .:ton St I Loras Blvd
100 50 0 100 Feet
Nap Prepared by:
Cityof Dubuque
Engineering Division
50 West 13th Street
Dubuque. bwa 52001
Phone: (583) 589 -4270
Fax: (583) 589 -4205
Figure 3 -5. Location map of Prairie St / Dell St alley.
3 -8
Proposed Green Alley
Pavement
Water
Sewer
Total Cost
Dell Street to Prairie Street
$ 95,945.62
$ 18,506.73
$ 48,130.50
$162,582.85
17 to 18 Street
$ 94,040.10
$ 54,713.78
$ 20,372.83
$ 169,126.71
16 to 17 Street
$ 84,719.58
$ 55,713.76
$ 15,097.78
$155,531.12
9 Street to 10 Street
$ 91,568.43
$ 42,978.09
$ 27,867.04
$162,413.56
$366,273.73
$649,654.24
3.3 ANTICIPATED COST
As part of the Consent Decree, the City is required to spend approximately $300,000 on the SEP.
The summary of probable costs for the four (4) proposed permeable interlocking paver alleys is
provided in Table 3 -1.
Table 3 -1. Summary of probable costs for the SEP.
The total estimated cost to construct all four alleys is approximately $650,000. Of that amount,
the pavement reconstruction (installation of permeable interlocking pavers) is approximately
$370,000.
3.4 TIMELINE AND REPORT
As provided in Paragraph 35 of the Consent Decree, the SEP must be completed by December
31, 2014. Construction of the first alley will begin during calendar year 2011. Notification of
property owners, permit applications (if necessary), and construction will be completed for the
remaining alleys in subsequent years. To the extent required by the Consent Decree, the City will
provide a copy of the Consent Decree to the selected contractor and subcontractors, if any,
working on the project.
Within 30 days of completing the SEP, the City will submit a report which summarizes:
a. A detailed description of the SEP implemented;
b. A description of any problems encountered in completing the SEP and solutions thereto;
c. An itemized list of all eligible SEP costs expended;
d. Certification that the SEP has been fully implemented pursuant to the provisions of the
Consent Decree; and
e. A description of the environmental and public health benefits resulting from
implementation of the SEP.
f. Certification as per Paragraph 87 of the Consent Decree.
SEP completion shall consist of final acceptance of all alleys by the City Council.
3.5 ACKNOWLEDGEMENT
As provided in Paragraph 43 of the Consent Decree, any public statement, oral or written, in
print, film, or other media, made by the City making reference to the SEP under the Consent
Decree must include the following language:
3 -9
"This project was undertaken in connection with the settlement of an enforcement action,
United States and State of Iowa v. City of Dubuque, Iowa, taken on behalf of the U.S.
Environmental Protection Agency and the State of Iowa under the Clean Water Act."