HomeMy WebLinkAboutCorp of Engineers-7/18/2016SWIF LOLATTACHMENT
WTL, Cedar River Basin, Black Hawk County, Waterloo, Iowa
Request for Approval of the System -wide Improvement Framework Letter of Intent (LOI)
Prepared by: Jamie Knutson, P.E., Associate Engineer
Signed: vD � Date: 18�11�
Mayor, City of Waterloo, Iowa
II► IR 1 -W0 1YC]`►I
The City of Waterloo is requesting approval of the System -wide Improvement Framework
(SWIF) Letter of Intent (LOI) for continued rehabilitation eligibility for the following:
WTL4 Waterloo, IA - LDB Cedar R. (East)
WTLI Waterloo, IA - RDB Cedar R. / LDB Black Hawk Ck (NW)
WTL2 Waterloo, IA - RDB Cedar R. / Black Hawk Ck (SW)
WTL3 Waterloo, IA - W/W Treatment Plant (South)
EVND Evansdale, IA - LDB Cedar R.
under P.L. 84-99 while developing a system -wide improvement framework (SWIF). This
attachment describes unacceptable deficiencies in the levee system and/or system -wide issues
that will be addressed under the SWIF, and justifies how a system -wide approach will optimize
flood risk reduction (i.e., will correct deficiencies in a manner that provides the largest flood risk
reduction in the most efficient and economical manner.)
The "Unacceptable" deficiencies are described below in Paragraph 2,"Description of
Deficiencies and Proposal for Using the SWIF Approach," and have resulted in the levee
systems being put on "inactive" status in the USACE P.L. 84-99 Program. As such, the systems
listed above are currently ineligible for federal funding for repairs if they are damaged during a
flood event. The City of Waterloo, IA is seeking conditional reinstatement of P.L. 84-99
eligibility by developing and executing a SWIF plan to correct complex deficiencies.
Since the most recent routine inspection dated October 21 and 22, 2015, the levee sponsor has
made progress toward correcting identified deficiencies, including:
Completion of televising of all storm and sanitary sewer pipes penetrations within the levee.
Completing two contracts for vegetation removal.
Another contract is tinder design for more vegetation removal.
Started construction on four, storm sewer sluice gate replacements.
Maps of items for general maintenance, based on the 2015 routine Inspection, have been sent to
various City departments for correction by August 26, 2016
General plan information and planning level costs determined for replacing the 43sanitary
gatewellsfvalvewells that are currently inoperable.
Other deficiencies rated "unacceptable" are more complex to correct and involve interagency
collaboration. These deficiencies and/or system -wide issues include improvements to multiple
levee segments, IDNR and USACE review andpermitting and the City of Waterloo is seeking to
SWIF LOl ATTACHMENT
use a SWIF approaeh to resolve these "unaeceptable" items and restore the levee to eurrent
USACE operation and maintenanee standards.
DESCRIPTION 01? LEVEE SYSTEM DEFICIENCTES AND PROPOSAIL FOR USING
SWIF
1. Levce System Ldentification:
1 .a. The levee system (or systems) covered by this LOl and included in the SWIF is/are listed in
Table 1.
Levee System
Name and ID
Numbcr
NLD
Segment
Name and
ID Number
Latest Seginent
Date and
Inspection Type
Rating
Sponsor Name
WTLI Waterloo,
IA - RDB Cedar
R. / LDB Black
Hawk Ck (NW),
NLD#
5105920001
Waterloo, L& -
RDB CedarR./
LDB Black
HawkCk(NW)
NLD#
5104500060
Routine inspeetion,
21-22 Oetober2ol5
U
City of Waterloo, TA
WTL2 Waterloo,
IA - RDB Cedar
R. / Btack Hawk
Ck (SW), NILD #
5105920002
Waterloo, IA -
RDB Cedar R. /
Black Hawk Ck
(SW) NILD#
5104500061
Routine inspection,
21-22 Oetober 2015
U
City of Waterloo, IA
WTL3 Waterloo,
Lk-WfW
Treatrnent Plant
(South), NLD #
5105920004
Waterloo, JA -
WfW Treatment
Plant (South)
NLD#
5104500063
Routine inspection,
21-22 Oetober 2015
U
City ofWaterloo, [A
WTL4 Waterloo,
IA - LDB Cedar
R. (East), NLD #
5105920003
Waterloo, JA -
LDB Cedar R.
(East) NLD#
5104500062
Routine inspection,
21-22 Oetober 2015
U
City of Waterloo, [A
Evansdale, IA -
LDI3 Cedar R.,
NLD#
5105920003
Evansdale, IA -
LDB Cedar R.,
NLD#
5104500064
Routine inspeetion,
21-22 October2ol5
City of Evansdale, IA
TABLE 1 - List of Levee Systems and Segments included in this SWTF LOl request.
1 .b. WTL1 RDB Cedar River, LDB Blaek Hawk Creek. Flood risk management works for
WTL1 hiclude about 2.3 niiles of clay levee along the Cedar River and about 2.6 miles ofclay
levee along Black Hawlc Creek. The upstream tie to high ground along the Cedar River is at
Rainbow Drive. The upstream tie along Blaek }lawk Creek is near Huntington Road and the
westerly city limits. The existing levee along Black Hawk Creek was raised and strengthened.
Closure struetures were installed at West±ieId Avenue and Fleteher Avenue. Interior drainage
ineludes a ponding area and numerous pump stations. The Forrester Ave pump station has a
12,500 g.p.m. eapacity. At other Ioeations where stoiui sewers interseet the levee, they were
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SWIF LOl ATTACHMENT
extended through the levee and sluice gates were installed for positive elosure. Where sanitary
sewers interseet the Ievee, sluiee gates were installed for baelcflow prevention. Sandbag closures
were also constructed at various locations in this unit. Construetion was completed on this
section in 1982. The City has constructed the foliowing pump stations to reduee interior ponding
after the 2008 flood: The Cattle Congress pump station has a 12,600 g.p.m. capaeity and is not
part ofthe system for PL -84-99 repairs. The Black Hawk Road pump station has a capaeity of
2,200 g.p.m. and is not part ofthe system for P1-84-99 repairs. The pump station at the
interseetion ofFleteher Avenue and University Avenue has a capacity of 12,000 g.p.m. and is
not part ofthe system for PL 84-99 repairs. The pump station at the intersection ofDowning
Avenue and Black Hawk Road has a capacity of 2,000 g.p.m. and is not part ofthe system for PL
84-99 repairs. The pump station at the interseetion of Westfield Avenue and Duryea Street has a
capaeity of 36,000 g.p.m. and is not part ofthe system for PL 84-99 repairs. The Ansborough
Avenue pump Station has a capaeity of 33,000 g.p.m. and is not part ofthe system for PL -84-99
repairs. The Solar/Lunar pump station has a eapacity of 1,000 g.p.m.. and is not part ofthe
system for PL -84-99 repairs.
The leveed area ineludes 8]2acres of land that includes residential, comniercial and agriculture
infrastructure, ineluding a John Deere foundry and numerous businesses to support John Deere
and afzre station andseveral sanitary sewerpump stations. The population at risk (PAR) is
2,269. A map ofthe system is ineluded at the end ofthis section.
WTL2 RDB Black Hawk Creek, RDB Ccdar River. Flood risk management works for WTL2
inelude about 2.5 miles of earthen levees along the Blaek Hawk Creek, about 2.4 miles of
earthen levees along the Cedar River and about 1 mile of flood walis. The tie to high ground
along Blaek Hawk Creek is at the Sergeant Road Trail embankment upstream from Movilia
Street. The downstream tie to high ground is west of the railroad tracks at the intersection of
Sheffield Avenue and Baston Avenue. Interior drainage ineludes numerous pump stations and
ponding areas. The existing pump station at the foot of West Sixth Street was enlarged to
103,000 g.p.m.. A new pump station at West 15Ih Street has a 9,900 g.p.m. capacity. The
Hawthome Avenue pump station has a eapaeity of 27,000 g.p.m.. At other locations where
storm sewers interseet the levee, they were extended through the levee and sluiee gates were
installed for positive elosure. Where sanitary sewers interseet the Ievee, sluice gates were
installed for baekflow prevention. Sandbag elosures were also eonstrueted at various locations in
this unit. Construction was eompleted on this section in 1982. The City has constructed the
foliowing pump stations to reduce interior ponding after the 2008 flood: Commercial Street and
River Road with a capaeity of 69,000 g.p.m.. The Conimercial Street pump station replaced the
Miles Street pump station and is not part of the system for PL 84-99 repairs. The Hollywood
Area pump Station has a capaeity of 25,000 and is not part of the system for PL -84-99 repairs.
The Fletcher Avenue pump Station has a capacity 14,000 g.p.m.. The Westfield Avenue at John
Deere pump Station has a capaeity of 300 g.p.m. and is not part of the system for PL -84-99
repairs.
The Ieveed area includes 900 acres ofland that includes residenilal, commercial and agriculture
infrasiructure, including a John Deere foundry and nunierous businesses to support John Deere,
banks a concrete plant andflre stations, City Hall, County Courthouse, countyjail and several
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SWIF LOT ATTACHMENT
sanitary sewerpurnp stations. The population at risk (PAR) is 1,399. A map ofthe system is
includecl at the end of tbis section.
WTL3 Waterloo Sewage Treatment Plant Levee. The Waterloo sewage treatment plant is
located in the Cedar River flood plain on the right descending bank of the Cedar River,
downstream of the City. A ring levee was provided around this facility with the access roads
ramped over the Ievee. The effluent pumps have a capacity of 48,000 g.p.m.. Construction was
completed on this section in 1982.
The Ieveed area contains the sanitary sewer treatment plant for the City of Waterloo. The
population at risk (PAR) is 12, just the plant personel. A map of the system is ineluded at the
end ofthis section.
WTL4 LDB Ceclar P.iver. Flood risk management works for WTL4 inelude about 5 miles of
earthen levees and about 1 mile offlood walis. The upstream tie to high ground for WTL4 is
north of Broadway Street and east of WCF&N Drive. The project ties into the Evansdale
Section 205 project at the downstream city limit on the left descending bank ofthe Cedar River.
Waterloo and Evansdale represent a continuous urbanized development 011 the Cedar River. The
proj ect provides a continuous line of protection for both cities with the city limits dividing the
projects. This is the least costly and best arrangement for the two cities. Closure structures are
at four Iocations: at Park Avenue; 6th Street Railroad Bridge; Eleventl-i Street and Eighteenth
Street. Interior drainage improvements in WTL4 include ponding areas and pump stations. At
the mouth of Virden Creek, a pump station was built that has a 135,000 g.p.m. eapacity. The
original pump station at the foot of Seventh Street was enlarged to 70,000 g.p.m. capacity. The
E 1st Street pump station has a capaeity of 3,300 g.p.m.. The capacity of the E Street Station
is 12,000 g.p.m.. Construction was completed on this section in 1982. The City has constructed
the foliowing pump stations to reduce interior ponding after the 2008 flood: The Vinton Street
pump Station has a capacity of 4,000 g.p.m. and is not part ofthe system for PL -84-99 repairs.
The Blowers Creek pump Station has a capacity of 156,000 and is not part of the system for PL -
84 -99 repairs. The Cedar Bend pump Station has a capacity of 58,000 g.p.m. and is not part of
the system for PL -84-99 repairs.
The leveed area includes 3,485 acres qfland that includes residential, commercial and
agriculture infrastructure, including numerous businesses to support John Deere, banks,
railroad switching hub andfire stations, Clly Hall, County Courthouse, countyjail, MW -
American Energy offices, electrical sub -stations, several schools andseveral sanitary sewer
pump stations. The population at risk (PAR) is 15,212. A map ofthe system is included at the
end ofthis section.
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SWIF LOl ATTACHMENT
2. Deseription of Deficiencies and Proposal for TJsing the SWIF Approach
Sanitary gate vaives and gatewelis are in inoperable. This will require removing and replacing
all ofthe sluice gates inside ofthe gatewelis. Access will be through the existing structures. The
gate vaives will require excavation through the levee, removal ofthe gate vaive, installation ofa
new structure and sluice gate.
There are 43 sanitary gatewelis andgate vaives throughout all segments ofthe system. Since
some ofthese gates will need to be replaced on large sanitary sewer interceptors thatfeed into
the treatrnentplant, precautions will neecl to be taken to not onlyprotect these structuresfrom
Jlooding but also allowfor bypasspumping ofraw sewage around the structures.
The most reeent routine continuing eligibility inspection report dated October 21 and 22, 2015
rated the Waterloo, IA - LDB Cedar R. (East), Waterloo, IA - RDB Cedar R. / LDB Black Hawk
Ck (NW), Waterloo, IA - RDB Cedar R. / Blacic Hawk Ck (SW), Waterloo, IA - WIW Treatment
Plant (South) as unaeceptable. The primary factor driving the unacceptable rating is that all of
the sanitary gate vaives andgatewells are inoperable.
Given the complexity of the deficiency including location, access to structures, nurnber of
structures, bypass pumping ofraw sewage and associated corrective actions, such efforts would
be best completed through a SWIF process. The levee sponsor will take a "fix the worst
deficiency first" prioritized approach with the overall goal of correcting all outstanding
deficiencies. Longer term system improvenients will be undertaken with the goal of correcting
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SWW LOl ATTACHMENT
more complex deficeinceis. The SWIF will outline deficiencies to be correeted and other
proposed system improvements; and will include interim risk reduction measures for
unacceptable deficiencies that will be implemented until those deficiencies are corrected.
3. Demonstration of Funding Commitment for SWIF Development and Implementation:
The City of Waterloo will secure all ffindthg necessary for Ievee rectification work. The rough
estimated cost for the rectification work is $3,500,000 and is availablefrom the State oflowa
Revolving Loan Fund. Corrective actions that have been completed or initiated since the last
USACE inspection inclnde:
Cotnpletion oftelevising ofall storm andsanitary sewerpipespenetrations within (he levee.
Completing two contractsfor vegetation retnoval.
Another contract is under designfor more vegetation retnoval.
Started construction onfour storin sewer sluice gate replacements.
Maps ofitemsfor general maintenance, based on the 2015 routine Inspection, have been sent to
various City departtnentsfor correction by August 26, 2016.
4. Tnterim Risk Reduction Measures:
The Cizy of Waterloo will implement interim risk reduction measures (IRRIVI) immediately upon
acceptance of this LOl and continue these measures, as necessary, throughout the development
of the SWIF and completion of the rectification work. Such measures will include:
Maintaining sandbags and sand supplyforjilling and installation into upstrearn manholes to act
as aplug. Maintaining an adequate number ofportablepumps and hoses to be deployed tf
bypasspumping is needed.
5. Interagency Collaboration:
The SWJF will be developed in consultation with the Iowa Department ofNatural Resources and
1JSACE. This interagency collaboration will continue as SWIF measures are implemented.
During this time, progress on SWTF milestones will be moriitored and evaluated by USACE.
Routine continuing eligibility inspections of the levee system will also be j ointly undertaken by
USACE and the City of Waterloo during the SWW development and implementation timeline.
USACE and the Clly of Waterloo will coordinate inspections during SWIF developinent and
implementation to ensure milestones are being met.
6. Anticipated State and Federal Permit, Analysis, and Consultation Requirements:
The City of Waterloo is responsible for continued operation, maintenance, repair and
rehabilitation needs on foliowing:
WTL1 Waterloo, IA - RDB Cedar R. / LDB Black Hawk Ck (NW)
WTL2 Waterloo, IA - RDB Cedar R. / Black Hawk Ck (SW)
WTL3 Waterloo, IA - W/W Treatrnent Plant (South)
WTL4 Waterloo, IA - LDB Cedar R. (East)
Special permitting may be required by the City of Waterloo to perform these activities to ensure
operation1 adequacy ofthe levee systems.
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SWIF LOT ATTACHMENT
In general, rectifieation worlc will involve:
The replacement ofsluice gates in sanitary gatewell structures and removal ofgate vaives and
replacement with gatewell structures on sanitary sewers.
The foliowing environmental peiuiits are anticipated for the project:
A possible 404 Clean Water Actpermit, an Iowa Department ofNatural Resources Sovereign
Landspermit, NPDES Storinwater Perinit, Ciiy of Waterloofioodplainpertnit and a USACE 408
permit.
CONCLUSION
Given the antieipated scope of necessary work, the City of Waterloo respectftilly requests that the
levee system (s) listed in Table 1 above retain(s) "active" status in the P.L. 84-99 Program while
the SWIF plan is developed. The City of Waterloo ask(s) that this initial request be granted for 2
years, to allow adequate tinie to develop a suceessful SWIIF plan.
Attached is a letter of support from the City of Evansdale, IA (EVND) for the City of Waterloo 's
submission of a Lefter of Intent for a System -Wide Improvement Framework for the segments
listed in Table 1.
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