HomeMy WebLinkAboutBrown and Caldwell Gallups/Merritts Creek Watershed Storm Water Management Amnd. No 2 13594
AMENDMENT NO.2
The CITY OF OSHKOSH, hereinafter referred to as CITY, and BROWN AND CALDWELL, 8383 Greenway
Boulevard, Suite 600, Middleton, WI 53562, hereinafter referred to as the CONSULTANT, entered into an
agreement for GALLUPS/MERRITTS CREEK WATERSHED STORM WATER MANAGEMENT PLAN on July 1,
2015.
Paragraph C in ARTICLE XI. PAYMENT included the provision that costs for additional services shall be
negotiated and set forth in a written amendment to this AGREEMENT executed by both parties prior to proceeding
with the work covered under the subject amendment.
THEREFORE, the CITY and the CONSULTANT agree to insert the following paragraph after the first
paragraph in ARTICLE III. SCOPE OF WORK:
The CONSULTANT shall provide the services described in the CONSULTANT's Attachment A dated June
11,2019.
The CITY and the CONSULTANT further agree to insert the following bullet point after the first bullet point
in Paragraph A of ARTICLE XI. PAYMENT:
• Payment for Amendment No. 2 shall be a Time and Materials Sum not to exceed $13,975 (Thirteen
Thousand Nine Hundred Seventy Five Dollars).
All other terms contained within the July 1,2015 agreement remain unchanged and in effect.
In the Presen of: CONSULTANT
Ate— By: �7
Nov, 1 A.( 1pt 1)leek_ k__AukxtRoppatd
U
(Seal of Consultant
if a Corporation (Specify Title)
By:
(Specify Title)
CITY OF KOSH
ess er � ',' ;h-•f Crir/H,�.�.�
clkP 4-5
And: Z
itness) Pamela R.Ubrig, City Clerk
AP OVED: I hereby certify that the necessary provisions
have been made to pay the liability which
which will accrue under this Agreement.
rney
City Comptro er
I:\Engineering\Tracy Taylor\James'Agreements\Brown&Caldwell\2015\Gallups-Merritts Crk\B&C CA#2- Page 1 of 1
Callups-Merritts Crk Watershed SWMP_7-26-19.doa
Attachment A
Amendment#2 to Gallups/Merritts Creek Watershed Storm Water Management Plan
Brown and Caldwell Project# 148104 RECEIVED
City of Oshkosh Reference: Authorization Date: 6/9/2015 JUN
11, 2019 2 12019
DEFT O
V8 W
This Attachment A documents additional scope and tasks requested of Brown and Caldwell •b�'tl3g,�JN iN S
City of Oshkosh(City)for services under the Gallups/Merritts Creek Watershed Storm Water
Management Plan project(City Authorization Date 6/9/15; BC Project# 148104)agreement dated July 1,
2015.
Scope Changes
Add Task 10 to the scope of work as follows:
Task 10. Analysis of Culvert Crossing at South End of Airport Runway(#18—36)
The Wittman Regional Airport is planning changes to the existing twin 63"x 87"CMPA culverts located
at the south end of Runway#18-36. The airport will be reconstructing Taxiway A and plans to replace
the twin 63" x 87" CMPA culverts.
The airport is considering two pipe sizes,twin 78"RCP or twin 53"x 83"HERCP culverts in the vicinity
of Taxiway A. The existing twin CMPA culverts will not be fully replaced under Runway#18-36 until
the runway pavement requires replacement. The City wants to analyze the impacts of increasing the
existing culvert capacity regarding flooding potential west and east of the airport. Under this new task,
BC will conduct the following work.
l0a Revise the existing XPSWMM model to replace the existing twin CMPA to twin 78"
RCP culverts under Taxiway A and Runway#18-36.
10b Revise the existing XPSWMM model to replace the existing twin CMPA to twin 53"x
83"HERCP culverts under Taxiway A and Runway#18-36.
10c Revise the existing XPSWMM model to replace the existing twin CMPA to a 6' x 12'
concrete box culvert. It is anticipated that this will increase peak flow rates and flow
volumes downstream of Wittman Regional Airport. Initial results of the modeling will be
documented and discussed with the City. No further analysis of mitigation measures will
be conducted.
l Od Conceptually resize a dry detention basin to be located west of the twin CMPAs. The
detention basin will be sized to prevent overland discharge north(to the Glatz Creek
Watershed) under the 100 year, 3-hour rain event. The conceptual dry detention basin
will be incorporated into the scenarios described under subtasks 10b and l Oc.
l0e Run the XPSWMM model with the revisions described above under the following rain
events:
Table 1 Storm Events for Modeling
Rainfall Duration Rainfall Depth
Recurrence Interval
(hours) (inches)
10-year 3-hour 2.28*
25-year 3-hour 2.85*
100-year 3-hour 4.06*
June 2008 15-hour 4.94**
* Rainfall Frequency Atlas of the Midwest(1992)
Gallups_Merritts Amend 2
Final
1
Attachment A
Amendment#2 to Gallups/ Merritts Creek Watershed Storm Water Management Plan
Brown and Caldwell Project# 148104
City of Oshkosh Reference: Authorization Date: 6/9/2015
June 11, 2019
** Rain duration and depth recorded at Wittman Regional Airport,Oshkosh,WI
1 Of Prepare maps and tables summarizing the runoff surface ponding depth and extent for
each rain event in Table 1 under the conditions described in subtasks 10a, 10b, and 10c.
lOg Prepare an additional section of the Gallups/Merritts Creek Watershed Regional Storm
Water Management Plan(Task 7)describing the results of the analysis under this
amendment.
l Oh The following meetings are included with this budget:
1) Attend(via conference call) a meeting with City Staff, Wittmann Regional Airport
representatives, and OMNNI Associates(Airport's Consultant)to discuss the
proposed Taxiway A project.
2) Hold one meeting with City Staff at the City of Oshkosh City Hall to review the
results from the initial analysis.
3) Hold a second meeting with City Staff at the City of Oshkosh City Hall to review the
results from the final analysis.
Revision to Attachment A—Schedule.
The schedule for final deliverables is revised to December 31,2019.
Budget Amendment •
All work will be conducted under the terms and conditions as described in the Gallups/Merritts Creek
Watershed Storm Water Management Plan agreement dated July 1, 2015. The Amendment budget is
provided below:
Additional Task Hours Costs
#10 Analysis of Culvert Crossing at South End of Airport Runway(#18—36) 88 $13,975.00
Current contract amount= $128,221.00
Amendment#1: $ 6,967.00
Amendment#2: $ 13,975.00
Amended Contract Amount: $149,163.00
Assumptions
1) All work on this amendment will be completed by December 31, 2019.
Gallups_Merritts Amend 2
Final
2