HomeMy WebLinkAboutPW CNT 14-12/Amend 1 • /��,,ce COAl AECOM 920.235.0270 tel
/'i 558 North Main Street 920.235.0321 fax
Oshkosh,WI 54901
RECEIVED
AUG 15 2014
DEPT. OF PUBLIC WORKS
July 25, 2014 OSHKOSH, WISCONSIN
Mr. Pete Gulbronson, Civil Engineer Supervisor
City of Oshkosh
215 Church Avenue
P.O. Box 1130
Oshkosh, Wisconsin 54903-1130
Subject: Amendment Request Number 1 for Project Design Changes, Hydrologic
Groundwater Study, and Staff/Schedule Changes Related To City Contract 14-12,
Snell West Sanitary Pump Station, AECOM Project No.60316513, City Resolution
Number 14-61
Dear Mr. Gulbronson,
AECOM Technical Services, Inc. (AECOM) is requesting an amendment to the agreement dated
February, 12, 2014, for Design Services related to this project.
Justification—Design Changes
The City of Oshkosh (City) Request for Proposal (RFP) dated December 2, 2013 described a
below-grade submersible type pumping station with a separate control building. During the project
kick-off meeting on Wednesday, February 19, 2014, it was determined that raw wastewater
screening will be necessary upstream of raw wastewater pumping, in order to protect the pumps
from debris and subsequent clogging. AECOM has developed a revised conceptual layout that has
been reviewed and approved by City staff. The following features are anticipated to be included in
the revised project design:
• Raw wastewater screening: mechanical bar screen with manual bypass trash rack
• Screenings washing and compaction
• Access hatches and metal stairs to lower screen room
• Service sink in upper screen room and hose bib in lower screen room
• Deduct bid alternative for screening and compaction equipment
• Flat precast concrete plank type roof with skylight for screen equipment access
• Single building for all components (approximately 72 ft x 35 ft), CMU cavity wall
construction, rather than separate buildings
• Monorail hoist lifting device above wet well for pump removal
• Above-grade valve and meter room, instead of below-grade vault
This document includes proprietary data that shall not be duplicated,used or disclosed outside City of Oshkosh Department of Public Works
for any purpose other than to evaluate this document.This restriction does not limit City of Oshkosh Department of Public Works'right to use
information contained in this document if it is obtained from another source without restriction.
• AECOM 2
Revised Budget—Design Changes
We are requesting that the budget be increased by$37,582, which equals an additional 354 hours
of effort including reproduction expenses. This increase in budget will cover the additional design
services required to complete the additional scope.
Hydrologic Background
Current design drawings and geotechnical information available from the existing lift station indicate
the wet well could extend to elevation 714.5 feet. The surface elevation is approximately 755.0 feet
and bed rock will be encountered at about 725.2. Groundwater maybe encountered at elevation
735.0. A cross section of available information is attached. Some of the immediate area
surrounding the site is considered wetlands and typically have water in them year round. According
to record drawings the existing lift station foundation extends into bedrock approximately 8 feet
(elevation 718). During construction of the existing lift station the groundwater dewatering effort
reportedly was very extensive and negatively impacted surrounding the local water supply wells. A
review of available Wisconsin Department of Natural Resources (WDNR) files was completed.
Dewatering issues related to the surrounding residential wells and of impacted water from the
presence of leaking underground petroleum storage tank site were confirmed.
A detailed understanding of soil, bed rock, and groundwater conditions is critical to complete the
design of the proposed lift station, understand and control construction issues, and limit negative
impacted to the surrounding structures and water supply wells. In addition, dewatering permits will
be required by the WDNR to construct the proposed lift station.
Hydrologic Study Approach
As was discussed in our Preliminary Layout Meeting on July 9, 2014, AECOM propose to complete
a data base search of available water well records we have from the State of Wisconsin. Once the
information is compiled we will prepare a base map showing well locations. In addition, AECOM
proposes to subcontract the installation of three, eight inch diameter groundwater wells. The wells
will be extended to approximate elevation 700.00'. The wells will be located such that they are
outside the anticipated construction area but close enough to be utilized as part of the site
dewatering system during construction. A groundwater pump draw down test will be completed to
collect data required to model the groundwater conditions and predict the effects of site dewatering
during construction. AECOM will estimate the volume and flow rate of water that maybe discharged
during construction along with determining an estimated influence zone. In addition, groundwater
elevations will be monitored monthly to develop groundwater seasonal elevation records.
Based on this information AECOM will prepare a summary of results and prepare and submit an
application for Temporary High Capacity Dewatering Well Installation, WDNR form 3300-258. We
anticipate a meeting with WDNR staff will be required to discuss the results and determine if
construction methods to reduce the volume and area of groundwater impacts will be required i.e
groundwater cut off wall.
The results of this meeting will provide an outline of the next steps required to permit the dewatering
program for construction. If WDNR requires a groundwater cut off wall, AECOM will prepare a cost
estimate to design a groundwater cutoff system to satisfy WDNR requirements. Once approval of
the design is received from the WDNR, AECOM will prepare project specifications and plans
sufficient for contractor bidding purposes for site dewatering during construction per the permit
Use or disclosure of data contained on this sheet is subject to the restriction on the first page of this document.
K:\PROPOSAL\City of Oshkosh\OPP-229722_Snell West Sanitary Pump Station\amendment\final\140326 Snell West Amendment 1
Cover Letter final.doc
•
AECOM 3
requirements. Please note we did not include the design of the cut off system, specification
preparation, and WPDES discharge permit because of the high variable of costs and the unknown
WDNR requirements
Revised Budget—Hydrologic Study
We are requesting that the budget be increased by$55,000, which equals an additional
approximate 300 hours of effort including reproduction expenses and a subcontract drilling cost of
$23,100. This increase in budget will cover the additional services required to prepare and submit
the initial permit applications and participation in one (1) meeting with the WDNR attended by up to
two (2)AECOM project team members. This task will be track separately on the invoices.
Staff/Schedule Adjustments
AECOM proposes to make the following changes to staff on this project. In addition a revised
schedule based on the design changes has been prepared. The proposed staff change and
schedule has been reviewed by City staff.
AECOM staff:
• Project Manager to Randy Wodrich.
• Lead Process Engineer and Assistant Project Manager to Gary Greeneway.
• Structural Engineer assisted by Shawn Reimes.
• Civil Engineer to Tom Holtan assisted by Jesse Weber.
Change in AECOM staff will not impact overall scope of work or cost.
Project schedule: Attached revised schedule was updated based on increased scope for screening
building request
Revised Budget—Staff/Schedule Adjustments
AECOM will complete the project as originally proposed in our proposal for the same rates and
estimated hours. The City will not realize any cost increase due to staff changes. Additional work
will be completed per the negotiated rates as provided in our proposal.
The services provided will be performed in accordance with the Negotiated Fee Schedule and
conditions of the General Conditions of Service—City of Oshkosh, April 2009, and as provided in
our original proposal dated January 17, 2014, which are expressly incorporated into, and are an
integral part of, our agreement for professional services. AECOM can begin providing these
services immediately upon receipt of the signed Amendment Authorization Form (attached).
Use or disclosure of data contained on this sheet is subject to the restriction on the first page of this document.
K:\PROPOSAL\City of Oshkosh\OPP-229722_Snell West Sanitary Pump Station\amendment\final\140326 Snell West Amendment 1
Cover Letter final.doc
• AECOM 4
If you have any questions or need to clarify a point, please call any of the undersigned at
920-235-0270.
Sincerely yours,
661„--
P trick E. Clifford, P.E. Paul F. Timm
Vice President/District Manager Account Manager
Attachments:
Amendment to Agreement Form
Amendment Authorization Form
Existing and Proposed Sanitary Lift Station
Revised Schedule dated 7/7/14
Use or disclosure of data contained on this sheet is subject to the restriction on the first page of this document.
K:\PROPOSAL\City of Oshkosh\OPP-229722_Snell West Sanitary Pump Station\amendment\final\140326 Snell West Amendment 1
Cover Letter final.doc
ATTACHMENT A
AMENDMENT TO AGREEMENT FORM
ATTACHMENT B
AMENDMENT AUTHORIZATION FORM
AECOM
AECOM
558 North Main Street,Oshkosh,WI 54901
T 920.236.6718 F 920.235.0321
Amendment to Agreement Form
Amendment No. 1
Design Services Related To City Contract 14-12
Snell West Sanitary Pump Station
•
AECOM Project No. 60316513
City of Oshkosh Resolution No. 14-61
RETURN TO: AECOM Date: July 25, 2014
558 North Main Street
Oshkosh, WI 54901
Attention: Paul Timm
SUMMARY: Original Contract Amount: $137,834
Total Previous Amendments: $0.00
Amount this Amendment: $92,582
Revised Contract Amount $230,416
Amendment# DESCRIPTION AMOUNT
1 Additional Design $37,582
Additional 354 hours of effort including
reproduction expenses
Hydrologic Study $55,000
Additional 300 hours of effort including
reproduction expenses, and subcontract
drilling
AECOM staff: Update staff-Change in $0.00
AECOM staff will not impact original scope of
work or cost.
Project schedule: Attached revised schedule
was updated based on increased scope for
screening building request and Hydrologic
Study.
Project conditions: All other project
conditions remain unchanged.
Total $92,582.00
A=COM
AECOM
558 North Main Street,Oshkosh,WI 54901
T 920.236.6718 F 920.235.0321
Amendment to Agreement Form
AECOM ..,.� _ City of Oshkosh
By: c By:
Pa y.F. Timm
Title: Account Manager Title:
Date: 1 Date:
By:
Patrick E. Clifford, .E.
Title: Vice President/District Manager
Date: July 9, 2014
f�I COM AECOM 920.235.0270 tel
� 558 North Main Street 920.235.0321 fax
Oshkosh,WI 54901
Authorization
July 25, 2014
I hereby certify that the necessary provisions have been made to pay the liability, which will accrue
under this contract.
I hereby authorize AECOM to proceed with the scope of work as outlined in Amendment 1, AECOM
project number 60316513, City RES Number 14-61, for the Snell West Sanitary Pump Station as
described in AECOM's proposal dated January 17, 2014, with a revised budget authorization of
$230,416 under the general terms and conditions specified in the proposal.
�
0827- 2.0 I9-
Signatu Date
Mark A Rohloff
Print Name
City Manager
Title/Organization
Signature ( Date
Pamela R. Ubrig `J
Print Name
City Clerk
Titl- Organization
Ilaw■si 4AL/ditto • ....at I
� 7
�'1:fire W Date
Lynn A. Lorenson
Print Name
City Attorney
Title/Organization
g . ai_ �LI
Signs ure Date
Trena Larson
Print Name
Director of Finance
Title/Organization
AECOM Environment 2
I agree to accept invoices from AECOM via e-mail and not postal mail:
El Yes
Signature:
E-mail address:
Recipient Mr/Ms:
Return to:
Name: Paul Timm
Address: 558 N. Main Street, Oshkosh, WI 54901
Phone: 920-236-6718/920-236-6712
e-mail: Paul.Timm @aecom.com
A
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