HomeMy WebLinkAbout10. 15-286
JUNE 9, 2015 15-286 RESOLUTION
(CARRIED___7-0_____LOST________LAID OVER________WITHDRAWN________)
PURPOSE: APPROVE AGREEMENT WITH BROWN AND CALDWELL FOR
STORMWATER MANAGEMENT PLAN FOR GALLUPS / MERRITTS
CREEK WATERSHED ($128,221.00)
INITIATED BY: DEPARTMENT OF PUBLIC WORKS
BE IT RESOLVED by the Common Council of the City of Oshkosh that the proper
City officials are hereby authorized to enter into and take those steps necessary to
implement an appropriate professional services agreement with Brown and Cladwell for
engineering services related to the development of a Storm Water Management Plan for
the Gallups/Merritts Creek Watershed in the amount of one hundred sixteen thousand six
hundred dollars ($128,221.00).
Acct. No. 561-2010-1799-00000 Storm Water Utility – Construction in Progress
ATfACHMENT A
Scope of Work
Gallups/Merrits Creek Watershed Storm Water Management Plan
City of Oshkosh,Wisconsin
May29, 2015
Project Understanding
The CiTy of Oshkosh is seeking to conduct a Storm Water Management Plan (SW MP)for the Gallups/Merrits Creek
Watershed. The SWMP will guide the Ciry in adtlressing existing flooding problems,and reduce storm water pollution.
Briefly,the SWMP will include:
. Preparing an%P SWMM'^'motlel to represent the hydrologic and hydreullc conditions ofthe Gallups/Merrits Creek
watershed.
. Identifying existing tlooding conditions during a variery of storm events.
• Evaluatingpo[entialfloodmitigationatternativestoselectaproposedalternativeformanagingstormwaterwithin
the watershed. The evaluation will include identirying the flood control benefits,as well as other factors such as,
constmction feasibility,costs,storm water polWtion control,antl environmental factors.
. Inmrporation of storm water pollution control measures where feasible.
• Cost estimates antl conceptual design inFOrmation for altematives evaluatetl as part of the study.
The Gallups/Merrits Creek Watershetl is an approximately 2.300 acre drainage area located on the south side of
Oshkosh. Appmximatety 50%of the watershetl is within the current corporate limits of the City of Oshkosh,and the
other half is unincorporated and mostly untler agricultural land use.
Figure 1(attached)shows the prqect area.
The open channei is highly channelized throughout the watershed and discharges to Lake Winnebago Gust north of
Stoney Beach Road at Fond tlu Lac Raad).
Of particular note with this study are areas where overland flow may leave the watershed antl enter a0jacent
watersheds during high flow perio0s indutling:
• The area near[he south end of the airport where ovedantl surtace fiow may discharge into with the Giatz Creek
and/or the Johnson Creek watersheds,antl
• The area near 35th Avenue where ovedantl flow may discharge into Johnson Creek watershed.
Scope of Services
Below is a scope of services for this project.
1. Collect survey information necessary to assist in the construction of the storm sewer network model.
a. Utilize NAVD 88 vertical tlatum and NAD 1983 Harn Wisconsin CRS Winnehago Counry horizontal datum.
b. Waterways:
i. Survey open channel cross sections from[he east end of the Wittman Airport Oroperty to USH 45.
ii. Cross section loca[ions to be surveyed are shown on Figure 2 attached to this document.
iii. Cross sec[ion minimum information requiretl:
1) 100 feet from top of bank(each sitle).
2) 50 feet from top of bank(each side).
3) 25 feet from top of bank(each side�.
4) Top of Bank(each side).
5) Toe of slope(each side).
6) Bed of Channel(center of channel at a minimum).
iv. Each city roatl or railroatl culvert or bridge crossing within the section of surveyed channel.
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Scoce o�µ'ork:Gallups/Merri6 Creek Watershetl Srorm Water Management Plan
v. ForeachcWVert/ britlge crossingthefollowinginformationwillbecollectetl:
1) Culvert/bridge opening size, material,length,
2) Upstream antl tlownstream invert elevations.
3) A cross section along the roatl centerline e#ending 500' in either direction from the
culven or bridge.
vi. A[each culvert/ bridge crossing photographs will be taken looking at each entl of the
culvert/bridge entrance and exit antl looking upstream and downstream from the culvert/britlge
m document conditions.
c. A field visit will be contlucted to culverts/bridges bcatetl outsitle the City of Oshkosh. The tield visit will
verity culvert size, material,and culvert inlet/outlet types. No survey work will be conductetl at these
CulVertS.
2, Construct Existing Conditions conveyance network model (XPSWMM'"^). Utilize"2D"modelingovedand flow
me[hotlology.
a. The hytlraulic conveyance system (open channels,storm sewers,and cuNerts/hridges)will 6e basetl upon
the following information:
i. Por the channel tlownstream from the east property 6oundary of Wittman Alrport:the field survey
pertormed under Task 1 of this scope of work.
ii. For the channel system on the Wittman Airport property information provided through the city
(data collected by Winnebago County)
iii. For the channel system upstream from the airport:existing LIDAR data antl WDOT USH 41 plan
tlacuments.
iv. All municipally owned storm and culverts upstream from Wittman Airport will be based on the
existing ciry GIS data, and supplemented with data collec[ed during the fieltl visit.
6. Model all storm sewer antl culvert segmen[s 18 inches in diameter(or equivalent)and larger.
c. Incorporate existing storm water management facilities(public and private)into the model. The city will
provide drainage plans Forthe facilities listed belowto he analyzed. (This list was generatetl byvisual
analysis of the City's GIS site plan locations, aerial photos and topographic information within the project
area.)
Praperty ProPerty Property
• Lion's Den • Plane View Truck Stop • Fox ValleyTech. Manufacturing
• County USA • GE Oil antl Gas Facility
• Competition Developments • Metlalist Laser Fabrication • NW Environmental Systems
• Oshkosh Tmck Credit Union • Stoney Beach W.Subdivision • Oshkosh Tmck(3231 Oregon SL)
• Sharp's Em6roidery • T&B Barr Real Estate • Oshkosh Tmck(333 W. 29�"Ave.)
• Cobblestone Inn �evelopment. 1423 Planeview • Barr Rentals LLC, 1423 Planeview
Drive Basin 1(Outside of City) �D�ive Basin 2(Outside of City)
d. In atldi[ion to Ihe stormwater facilities listed under 2.c.; BC will account fo�up to 6 "non-engineered"
ponds, or other internaltydreined areas within the rural portions ofthe watershetl tluringthe constmction
of the conveyance network.
3. ConstmctExistingContlitionWatershetlCharacteristics(Hydmlogy).
a. The hydrologic methotl to be used to calculate runoff will either he the TR 55 Curve Number approach or
theSWMMhydmlogyapproach. Becauseoftheurban/�urelmixoflanticoverwithlntheprojectarea. BC
will consWt with Dr. Robert Pitt to obtain a recommended approach. BC will then veriry the
recommendation with the City and select a methodology.
b. BC will calculate the required input parameters for each sub-watershed based on the selected hydrology
method.
a Subdivide into smaller watersheds as needed in order to properly exewte the model.
4. Euecute &isting Contlitions Hydrologic antl Hydraulic Model
a. Utilize Huff&Angel(Midwest Climate Center Bulletin 71)reinfall tlepths antl distributions.
.._,.:.n enJ Cai�w,il GellupsMerrin Proposal v5.doa� 2
Scope or wo�k:caimps/mernts Creex watersnea Smrm wate.Managemem rian
b. Run and cali6rate motlel with lune 12-13.2008 raintall amounts antl soil contlitions and compare with
actual observed flooding conditions to fine tune model. The City of Oshkosh will provide the rainfall
distri6ution 6ased upon the Wittman Regional Airport recordingstation.
c. Pertorm sensitivity analysis to determine which duration design storm is the mos[critical for conveyance
5ystem CapaCities(CheCk the 1-hOUY,2-houY,3-hOUf, 6-hoUr, antl 12-hour tluration Stofin events).
d. Utilize existing lantl use antl coverage characteristics.
e. Run model atthe critical tluration forthefollowing 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. Preparecobrfiguresshowingthemaximumextentofflootlingduringeachstormevent. Thefiguresshall
he mlor coded to show tlepth of flooding(typical ranges utilized are: 0.01'-025', 0.25'-0.5',0.5'-1.0',antl
greater than 1').
g. Prepare table noting the flootling tlepth antl tluration for up to 25 locations for each design storm antl for
the June 12-13,2005 storm event. Locations will be determinetl through coortlination with City staff.
h, Prepare ta61e identifying the peak flow rate and total mnoff volume of overlantl flow leaving the study area
and flowing into atljacent watersheds for each design storm and for the June 12-13, 2008 storm event.
i. If the City provitles information indicating overland flow into the Gallups/Merritt Watershed,this flow will
be accounted for.
5. EvaluateStormWaterManagementAltematives
a. Review and coordinate(where appropriate)with previous stutlies within watershed and adjacent to the
watershetl.
i. 2000 Citywide Smrm Water Management Stutly(Mead & Hunt).
ii. 2013 Citywide Stormwater Managemen[Plan Update(AECOM).
iii. Glatz Creek Watershed Study(MCMahon draft)
h. Storm Water Quantiry Goals �
i. ForallCitystreets:
1) Eliminate street surcharging of the storm sewer system on[o the street for up to the 14
year design storm. .
2) Maintain tlrivability of streets(center of street"dry")for up to the 25-year tlesign storm.
3) Contaim m�off within the right-of-way for up m the 100-year tlesign storm.
ii. For culvert crossings:
1) For USH 41: pass the 100 year peak flow without highway Flooding
2) For CTH I and USH 45: pass the 50 year peak flow without street surtace flootling
3) For all other town roatls outsitle of the City BC will model future contlitions as if the 25
year peak flow were allowetl to pass without street flooding.
c. StormWaterQualityGoals:
i. Pmvide smrmwater polWtion reduction to help city meet pendingTMDL requirements.
tl. Develop a list of patential shuc[ural storm water management measures.
i. Coordinatewithcitystafftodeterminefeasibilityofpotentialcomponents.
ii. Utilize City appmvetl list[o tlevelop five(5) mitigation alternatives.
e. Storm water management alternatives may consist of a single component,or a combination of �
components. The components of the adtlitional alternatives will be based upon discussions with city staff
duringthe review process.
i. Altematives will be evaluated using XPSWMM model developed untlerTask 4. The XPSWMM
model will be modifietl to incorporate mitigation measures.
,,, - , .,.� GellupsMertlttPmpaselv5.0acvl3
Swpe of Work:GaINDS/Merrtts Creek Wxten�ed Srorm Water Management Plan
ii. Altematives analysis shall inclutle executing the model at the critical duration tor the 16year,25-
year,and 100.year design storm events.
iii. Preparetableand/orfigureshowingtheretluctioninflootlingforlocationsidentifiedin4.g.
f. Analyze up to ten(10) mitigation alternatives. The initial(ive(5)altematives tleveloped under S.d,and up
to five(5)adtlitional alternatives that wiil be developed in conjunction with City staff Ihrough[he review
and discussion process.
g. Preparefiguresshowingthelocationsandconceptuallayoutsforabovealtemativesandcomponenuof
altematives. If renderings a�e desired forthe recommended alternative,they will be added via contract
amendment at a later date.
h. Prepareplanninglevelcostestimatesforanalyzetlalternatives.
i. Coortlinate with city staff for cost information to be used.
i. Potential sanitarysewer, large tliameter water main,ANR Pipeline,antl ATC Transmission Line conflicts
shall be taken into account during the alternatives analysis. The City will provitle available GIS information
to assist in accoun[ingforthese potential conflicts.
j. Poten[ial u[ility conflicts other than those listed above shall no[be[aken into account during the
alternatives analysia �
k. Coordinate with city staff to recommentl one alternative.
6. Ezecute Post-Mitigation Hydrologic antl Hydraulic Model(with recommended altemative).
a. Run madel at the critical tluration for the following design storm events:
i. 1-year
ii. 2-yea�
iii. 5-year
iv. 10-year
v. 25-year
vi. 54year
vii. 100-year
b. Preparecolorfiguresshowingthemaximumertentoffloodingtluringeachstormevent. Thefiguresshall
be cobr coded to show tlepth af flootling.
c. Run model with lune 12-13,2008 rainfall amounts and soil conditions.
d. Prepareta6le antl/or figure showingthe reduc[ion in Flooding at the locations itlentifietl in 4.g.for theJune
12-13, 2008 storm event �
e. Pertorm sensitivity analysis to determine which tluration of 100-year design storm event is the most critical
for detention facilities. Note the peak water surtace elevation of this storm event for all detention facilities
in atldition to the other design storm events modeled.
7. Prepare de[ailed written report, including at a minimum:
a. Ececutive S�mmary.
b. In[roduction and Project5etting.
c. Watershetl Characteristics.
tl. EngineeringAnalysisof&is[ingConditions.
e. Altematives Analysis.
f. EngineeringAnalysisofPost-MitigationCOndltions.
g. RecommendationsandCOnclusions.
h. Implementation Discussion and Potential FuntlingSources.
8. Five(5)meetings with Ciry staff,a Storm Water UtilRy Committee Meeting,and a Common Council Workshop are
included in this Scope of Services. The Storm Water Utility Committee Meeting and the Common Council Workshop
will be to presen[the findings of the study. In addition,one(1)o[her night meeting is inclutled for a Sotal of eight
(8) meetings.
9. Required tleliverables:
a. Four(4)hard copies of Drak Report.
b. Adobe Acrobat Portable Document Format(pdf)of the Drak Report.
c. Four(4) hard copies of Final Report.
G�ovm and Gal�e�_�,: pallupsMerntt PropoSal vS.tlONI 4
Scope of Worx:GalluDS/Merrds Creek Watershetl S�orm Water Management Plan
tl. Atlobe Acrobat Portable Document Format(ptlf)of the Final Repon.
e. Au[oCAD 2013 drawing file of survey work.
f. AutoCAD 2013 tlrawing file of all component concept plans.
g. Electronic model files.
h. ESRI ArcGIS shape files for themes that have 6een updated 6asetl upon survey work.
Assumptions and Limitations
The following assumptions were made in preparing the for the Scope of Services budget.
1. The information provitled by the City of Oshkosh as tlescribetl below antl can be relied upon by BC without
indepentlent veritication as to the accuracy of the tlata.
a. Storm sewer,culvert,sanitarysewer,water tlishihution, antl other municipal infrastructure GIS information
to assist in the model network building antl alterna[ives analysis.
b. Digital images of tlevelopment Grading antl Drainage Plans to assist in the input of existing private
tletention facilities. 7hese images typically do not contain a stage-storege table, but do contain contours
which can 6e utilized to calculate the stage-storage information.
c. GlSinforma[ionrelatingtotheimperviousareaforparcelswithinthecirylimits.
d. GIS informa[ion relatingto the lantl use characteristics for all parcels within the city limits.
e. 7iff images of utility antl paving plans, if requiretl.
L Informatian from the Glatz Creek watershed stutly to assist in delineation of the watershetl boundary.
g. Availahle channel antl cuNert survey information fmm Wittman Airport pmperty
h. Plans from WDOT HVJY 41 relevant to the drainage system in the s[udy area.
i. LIDAR data necessaryto utilize the "2D" modeling.
2. The Lake Winnebago tailwater elevation to be utilized is 747.56.
3. Other than the work conducted under Task 1(Survey)and a single site visit to observe existing conditions at
poten[ial regional detention basins, no other field work will be conducted (incJuding, but not limitetl to:wetlands
investigations and/or environmental investigations).
4. Property bountlarysurvey work(CSM) is not included untlerthe Scope of Work.
5. The CiTy will obtain written approvals from property owners for survey site access before any field work is
contluCted.
6. Cost for railroad flagmen antl railmad access is included in the project butlget and assumetl not to exceed
$2,000.00.
7. No fetleral,state, or local government permit preparation work is included in the scope of work.
8. Other than the meetings described under Task 8, no other face-to-face meetings are budgeted.
9. Budget assumes consistent hydrologic methods and rainfall distributions are used throughout the p�qect area.
1Q The contrec[terms antl contlitions as usetl in the`2015 General Storm Water Management Services"agreement
will be used for this agreement.
11. The budget provitles for a labor rate atljustment for work conduc[etl in calendar year 2016.
12 This is a planning leVelStUdy,antl no tle5ign leVel seNiCes are inclutletl in the SCOpe of work.
Schedule
6C an[icipates initiatingthe prqect in June 2015. Assumingthe City's Notice[o Proceetl is issued by this time, BC will
commence work immediately antl the final tleliverables will 6e providetl to the City by June, 2Q16.
Compensation
BC proposes to pertorm the work tlescribetl in the Scope of Services on a time and materials basis for a fee not to
exceed $128,221.00. A tletailed budget breaktlown by task(staff,labor hours, expenses,and task cos[s)is provitletl
below.
Notice to Proceed: Brown antl Caldwell will complete the services defined herein upon receiving notice to proceetl from
the City of Oshkosh.
��,,...enn�z.a•ei OallupsMerdtt Proposal vSGOCx I 5
SwOe of Work:GalluOS/Mernts Lreek WalersM1eE Sform Water Management Plan
Phase Phase Description Total La6ar Survey gudget
Hours Subconwltant
001 Field Survey 8 Culvert Inpection 40 $18,500 $24,390
002 CongructExistingConditionsCOnveyance 86 $0 811,475
003 ConstructExis[ingContlitions Hydrology 97 EO N2.456
004 Exacute ExiSing Conditiona Model 78 EO 510,298
005 Evaluata SW Mgmt Alternatives 155 $0 $20,592
006 Execute Post-Mitigation Model 64 $0 58,358
007 Prepare Report 132 $0 $18,576
008 PM I Meetings 757 SO EZZ,076
TOTAL 809 $18,500 $728,221
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Figure 2: Oshkosh: Gallups/Merritt Watershed Survey Needs She�
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MEMORANDUM
TO: Honorable Mayor and Members o(the Comm uncil
FROM: James Rabe, Civil Enqineering Superviso
DATE: June 4, 2015
RE: Agreement for Engineering Services for Storm Water Management Plan for Gallups /
Merritts Creek Watershed/ Brown and Caldwell($128,221)
BACKGROUND
The Slorm Water Utiliry continues to complete wa[ershed-wide Storm Water Management Plans to
provide recommendations for reducing the impact of Flooding within the numerous watersheds within the
City of Oshkosh. These studies are critical to identifying recommendations to reduce the impact of
flooding within the Ciry. Engineering staff requested and reviewed a proposal from Brown and Caldwell
for engineering services related to the development of a Storm Water Management Plan for the Gallups/
Merritts Creek Watershed. The Gallups / Merritts Creek Watershed is locatetl on the south side of the
City of Oshkosh. The headwaters of this watershed are in the vicinity of the water tower on CTH N. The
creek flows in a northeasterly direction, crossing USH 47 and the south end of Wittman Regional Airport,
before entering the Ciry near the intersection of 35'"Avenue and Marvel Drive. The creek tlischarges to
Lake Winnebagojust south of the USH 45—Canadian National Railroad crossing.
ANALYSIS
Engineering Division staff reviewed the proposal and associated cost The services to be provided
include collecting survey information; constructing existing conditions conveyance neCxork model, and
watershed characteristics; executing existing conditions hydrologic and hydreulic model; evaluating storm
water management altematives; exewting post-mitigation hydmlogic and hydraulic model; preparing a
report, and attending meetings related m the plan. Brown and Caldwell was selected to pedortn these
services because of their ezperience in providing similar services to the City and their ezceptional quality
of service.
FISCAL IMPACT
The proposetl fee is not to exceed $128,221. Funtls for these services are budgeted in the 2015 Capital
Improvements Program.
RECOMMENDATIONS
Chapter 12 of the Municipal Code of the City of Oshkosh provides [hat professional services of a
specialized nature, including engineering services, may be procured without the use of formal, sealed
quotes. I have reviewed the proposal and in accordance with Section 12-16 of the Code, I am hereby
recommending that the Common Council approve this agreement.
Approved,
'Y`--� ,��
Mark A. Rohloff
City Manager
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