HomeMy WebLinkAboutAECOM Proposal No. 572170 AECOM 920.235.0270 tel
ASCOM 558 North Main Street 920.235.0321 fax
Oshkosh,Wisconsin 54901
October 31,2016
Mr.John Ferris,PE
Civil Engineer Supervisorri �,��
City of Oshkosh -
215 Church Avenue
Oshkosh,Wisconsin 54903-1130
Subject: Contract Documentation for the Johnson Avenue Watershed Storm Water
Management Plan Project for the City of Oshkosh,Wisconsin
AECOM Proposal No.OPP-572170
Dear Mr.Ferris:
Please find attached the necessary documentation to execute the agreement between the City of
Oshkosh and AECOM Technical Services,Inc.(AECOM)for completion of the Johnson Avenue
Watershed Storm Water Management Plan project. The attachments are described as follows:
• Scope of Services for the Johnson Avenue Watershed Storm Water Management Plan
• Authorization Form
Services described in this proposal will be performed on a time-and-expense/unit-cost basis. Based
upon the below scope of services,and discussed with the City of Oshkosh,the estimated budget for
this project to provide Storm Water Management Plan services to the City of Oshkosh is$126,420.
The project will be performed in accordance with the 2016 Negotiated Fee Schedule and the April
2009 Negotiated Terms and Conditions between AECOM and the City of Oshkosh,which are
expressly incorporated into,and are an integral part of,contract for professional services. AECOM
can begin providing these services immediately upon receipt of the signed Authorized Form
(attached).
Please indicate your acceptance of this proposal by having authorized individuals of the City
execute the attached Authorized Form and return it to our Oshkosh office.
We appreciate the opportunity to provide these engineering services to the City of Oshkosh. If you
have any questions regarding the attachments provided,please call Paul Timm at 920-716-1338 or
Paul Drew at 414-944-6152.
ncerely yours, �,, /J
P(/i/t/ bucvj
_P I F.Timm Paul D.Drew, EP K—f �
unt Man er Project Manager
Thomas J. tan,PE
Senior Project Manager
Attachments AECOM Scope of Services
Authorization Form
Cc:Tracy Taylor,City of Oshkosh Department of Public Works
OPP-572170_Johnson Avenue Watershed Contract Documentation Proposal.docx
Johnson Avenue Watershed Storm Water Management Plan
Scope of Services
1. Collect survey information necessary to assist in the construction of the storm sewer
network model.
A. Utilize NAVD 88 vertical datum and NAD 1983 Ham Wisconsin CRS Winnebago County
horizontal datum.
B. Roadside ditches,including culvert crossings:
i. Survey up to 15 primary culverts within the drainage system. Shoot upstream and
downstream inverts and measure size and note material.
it. For culverts under the railroad tracks,AECOM wit[work with the City to secure right of
entry and flagman services.
iii. Survey cross sections upstream and downstream of each culvert to represent the channel
shape. Cross sections will be extended outside of the channel what is determined to
generally be the top of slope or beyond.
iv. Survey up to 10 additional roadside ditch cross section locations to aid in defining the
drainage system,
2. Construct conveyance network model(XPSWMMTM).Utilizing"2D"modeling overland
flow methodology.
A. Model all storm sewer,and culvert segments 18 inches in diameter(or equivalent)and
larger.Figure 1 shows the location of the storm sewer within the watershed.
B. Incorporate existing storm water management facilities(public and private)into the
model.Figure 2 shows the sites that have approved Drainage Plans on file.
C. The City of Oshkosh will provide storm sewer and culvert GIS information to assist in the
network building.The information contained in the GIS may be utilized without the need
for field verification.
D. The City of Oshkosh will provide tiff images of development Grading and Drainage Plans
to assist in the input of existing detention facilities.These images typically do not contain
a stage-storage table,but do contain contours which can be utilized to calculate the
stage-storage information.
E. The City of Oshkosh will provide tiff images of utility and paving plans,if needed and
available.
F. The City of Oshkosh will provide the LIDAR data necessary to utilize the"2D"modeling.
G. The Lake Winnebago tailwater elevation to be utilized is 747.56.
3. Construct Watershed Characteristics.
A. The City of Oshkosh will provide most recent GIS information relating to the impervious
area for parcels within the city limits.
B. The City of Oshkosh will provide GIS information relating to the land use characteristics
for all parcels within the study area.
C. The watershed boundary will initially be developed following the City's Johnson Avenue
Subbasin delineations as shown on Figure 1. Following the initial model development,
OPP-572170_Johnson Avenue Watershed Contract Documentation Proposal-dou
AECOM 3
the potential interconnection between the Gallups/Merritts Creek Watershed and the
drainage area immediately south of the Johnson Avenue watershed,particularly that
area along W.Ripple Avenue will be evaluated and potentially force the expansion of
the study area and watershed boundary limits to account for the interaction. The
incorporation of major additional drainage areas and components(such as modeling the
entire Gallups/Merritts Creek Watershed)is not included in this scope of work.
D. The major sub-basins will be subdivided as needed in order to properly execute the
model.
4. Execute Existing Conditions Hydrologic and Hydraulic Model
A. Utilize Huff&Angel(Midwest Climate Center Bulletin 71)rainfall depths and
distributions.
B. Run and calibrate model with June 12-13,2008 rainfall amounts and soil conditions and
compare with actual observed flooding conditions to fine tune model.The City of
Oshkosh will provide the rainfall distribution based upon the Wittman Regional Airport
recording station.
C. Perform sensitivity analysis to determine which duration design storm is the most critical
for conveyance system capacities(check the 30-minute,1-hour,2-hour,3-hour and 6-
hour duration storm events).
D. Utilize existing land use and coverage characteristics.
E. Run model at the critical duration for the following design storm events:
i. 1 year
ii. 2-year
iii. 5-year
iv. 10-year
v. 25-year
vi. 50-year
vii. 100-year
F. Prepare color figures showing the maximum extent of flooding during each storm event
and the June 12-13,2008 storm event.The figures shall be color coded to show depth
of flooding(typical ranges utilized are:0.01'-0.25',.0.25-0.5',0.5'-1.0',and greater than
G. Prepare table noting the flooding depth and duration for up to 15 locations for each
design storm and for the June 12-13,2008 storm event.Locations will be determined
through coordination with City Staff.
5. Evaluate Alternatives
A. Review and coordinate(where appropriate)with previous studies within watershed and
adjacent to the watershed.
L 2000 Citywide Storm Water Management Study(Mead&Hunt).
ii. 2008 Citywide Stormwater Management Plan and Ordinance Development(Earth
UPROPOSA.\City of Oshkosh\CPP-572170_Johnson Ave Watershed contract Documentation\OPP-572170 Johnson Avenue Watershed
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iii. 2014 Citywide Stormwater Management Plan Update(AECOM)
B. Mitigation Goals:
i. Keep runoff below the rim elevation in the 10-year design storm event.
ii. Keep the peak water surface elevation less than 0.5-ft above the rim elevation during the
25-year design storm event.
iii. Contain runoff within the right-of-way for up to the 100-year design storm.
iv. Reduce Total Suspended Solids(TSS)and Total Phosphorus(TP)
C. Develop a list of potential mitigation components.
L Coordinate with City Staff to determine feasibility of potential components.
ii. Utilize City approved list to develop up to three(3)mitigation alternatives.
D. Mitigation alternatives may consist of a single component,or a combination of
components.The components of the additional alternatives will be based upon
discussions with City Staff during the review process.
i. Alternatives analysis shall include executing the model at the critical duration for the 10-
year,25-year,and 100-year design storm events.
ii. Prepare table and/or figure showing the reduction in flooding for locations identified in 4.G.
E. Analyze up to six(6)mitigation alternatives.The initial three(3)alternatives developed
under 5.C.iii.above,and up to three(3)additional alternatives that will be developed in
conjunction with City staff through the review and discussion process.
F. Using WinSLAMM,evaluate how the potential flood mitigation alternatives can also
enhance TSS and TP pollutant removal_
G. Prepare figures showing the locations and conceptual layouts for all alternatives and
components of alternatives.If renderings are desired for the recommended alternative,
they will be added via contract amendment at a later date.
H. Prepare planning level cost estimates for all analyzed alternatives.
L Coordinate with city staff for cost information to be used.
I. Potential sanitary sewer and water conflicts shall be taken into account during the
alternatives analysis.The City will provide available GIS information to assist in
accounting for these potential conflicts.
J. Potential utility conflicts other than listed above shall not be taken into account during
the alternatives analysis.
K. Coordinate with City Staff to recommend one alternative.
6. Execute Post-Mitigation Modeling(for the recommended alternative).
A. Utilize existing land use and coverage characteristics unless otherwise directed and
provided by the City.
B. Run model at the critical duration for the following design storm events:
L 1-year
K\PROPOSAL\City of 0shkosh\OPP-572170_Johnson Ave Watershed Contract Documentaton\OPP-572170_John5on Avenue Watershed
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ii. 2-year
iii. 5-year
iv. 10-year
v. 25 year
vi. 50-year
vii. 100-year
C. Prepare color figures showing the maximum extent of flooding during each storm event.
The figures shall be color coded to show depth of flooding,
D. Run model with June 12-13,2008 rainfall amounts and soil conditions.
E. Prepare table and/or figure showing the reduction in flooding at the location identified in
4.G.for the June 12-13,2008 storm event.
F. Using WinSLAMM,evaluate resulting potential TSS and TP pollutant reductions.
G. Perform sensitivity analysis to determine which duration of 100-year design storm event
is the most critical for detention facilities.Note the peak water surface elevation of this
storm event for all detention facilities in addition to the other design storm events
modeled.
7. Prepare detailed written report,including at a minimum:
A. Executive Summary.
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