HomeMy WebLinkAboutAECOM-Supplemental Agreement No. 1-Final Clarifier Maintenance-4/13/2020_ AECOM 319-232-6531 tel
�C0M Sui Sycamore Street 319-232-0271 fax
Suite 222
Waterloo, Iowa 50703
www.aecom.com
CITY OF WATERLOO
FINAL CLARIFIER MAINTENANCE AND REPAIRS
SUPPLEMENTAL AGREEMENT NO. 1
WHEREAS, a Professional Services Agreement was entered into between the City of Waterloo, Iowa
(Client), and AECOM Technical Services, Inc. (ATS), of Waterloo, Iowa, dated October 16, 2017, for
design services for obtaining a variance from Iowa Department of Natural Resources for the
Dewatering for Final Clarifier 3 Maintenance and Repairs Project.
WHEREAS, the Client and ATS now desire to enter into Supplemental Agreement No. 1 for providing
design, plans, specifications and construction -related services (CRS) for Final Clarifier No. 3
Dewatering System,
NOW THEREFORE, it is mutually agreed to amend the original Professional Service Agreement as
fol lows:
A. Project Description
At the Water Pollution Control Facility (WPCF), the final clarifiers on the Easton Treatment
Plant are requiring repairs or equipment replacements. Final Clarifier No. 3 was not operating
properly and was taken out of service. During recent maintenance activities on this clarifier,
it was observed that the grout layer on the floor of the clarifier is spalling and separating
causing the operation of the rake and skimmer mechanism to fail. It was also observed at a
previous time that there appeared to be groundwater leaking through the wall of the clarifier.
Due to high groundwater at the site, it is difficult to properly maintain the clarifier equipment.
There is a risk to the structure of the clarifier if the tank is pumped down without properly
bringing the groundwater level around it down. The mechanisms in these clarifiers are
approaching the end of their projected useful life.
Requirements for providing permanent dewatering wells near the final clarifiers have been
reviewed per the Iowa Code and with discussions with Iowa DNR. In the Iowa Code,
dewatering wells are considered temporary in nature; and if permanent wells are installed,
they must comply with the Iowa Code and be constructed as if they are wells intended for
drinking water. The City and AECOM obtained a variance from Iowa DNR to make the
dewatering wells permanent and built and designed for that function.
With this project, AECOM will design three dewatering wells, two piezometers and temporary
pumping systems to be installed near Clarifier No. 3. Test pumping will be performed by the
well drilling contractor. The testing will generate groundwater flow and drawdown data for
the aquifer properties. The level of the drawdown will be dependent on the Cedar River
elevation at the time of the testing. The information obtained during the well testing period is
planned to become the basis of future dewatering wells and permanent pumping systems to
be designed and installed at a later time near the Easton plant final clarifiers. AECOM will
provide CRS services with the well installations and testing.
It is intended that the City will coordinate having a clarifier maintenance company on -site to
review the condition of Clarifier No. 3 and perform emergency maintenance as possible
during the well testing period.
A=COM
B. Scope of Services
Page 2
The Scope of Services will encompass and include detailed work, services, materials,
equipment, personnel and supplies necessary to provide plans, specifications, and
construction -related services for the project. The Scope of Services is further defined as
follows:
Design Services
Task 1 -Kickoff Meeting. With the City of Waterloo and AECOM staff, a kickoff meeting will
be conducted to discuss scope of project, objectives and goals.
Task 2 -Topographic Survey and Horizontal and Vertical Control. Provide topographic
survey in the area around Final Clarifier No. 3 for the Easton Plant. Provide horizontal and
vertical control for the project.
Task 3 -Contract Documents. AECOM will prepare contract documents which includes
advertisement, general conditions, contract, CAD design drawings and technical
specifications for the three -well, two-piezometer initial test well system for Clarifier 3. It is
intended to install the three wells at locations that can be logically incorporated into an overall
future plan of several wells that can be selectively pumped to dewater any of the eight final
clarifiers (Easton and Satellite).
Task 4 -NPDES Permit Review and Iowa DNR Coordination. AECOM will review and
consider the restrictions in the City of Waterloo's NPDES (National Pollutant Discharge
Elimination System) permit limitations with regard to the groundwater discharge from the test
pumping. AECOM will coordinate with Iowa DNR with proposed dewatering operations and
expected dewatering discharges.
Task 5 -Engineer's Opinion of Probable Costs. An Engineer's Opinion of Probable Costs
will be developed for the project.
Task 6 -Preparation and Distribution of Contract Documents. Prepare contract documents
for distribution to plan rooms and potential bidders.
Task 7 -Respond to Bidders Questions. Respond to questions that bidders may have
regarding the project. Prepare addenda as needed for project.
Task 8 -Attend Bid Opening. Attend bid opening, secure contracts, bonds and certificates
of insurance, review bids, prepare bid tabulation and make recommendation to the City of
Waterloo.
Construction -Related Services
Task 9 - Preconstruction Conference. Conduct a preconstruction conference with
representatives of the contractor, Client, ATS and affected utilities.
Task 10 -Submittals. Review shop drawings and other submittals as required of the
contractor by the contract documents for conformance with the design concept of the project
and compliance with the information given in the contract documents.
Task 11 -Project Intentions. Answer design interpretation questions from the Client,
contractor, review staff and appropriate agencies.
AECOM
Page 3
Task 12 - Contractor Payment Applications. Process monthly applications for payment
submitted by the contractor and forward to the Client for execution with recommendations for
approval and payment.
Task 13 -Field Testing Conformance Review Assistance. Witness, where applicable, field
testing of the materials furnished under the contract to assist in determining conformance
with the contract documents.
Task 14 -Site Visits by Design Personnel. Construction site visits by design personnel at
appropriate stages of construction to review the quality of the work and to determine, in
general, whether the work conforms to the contract documents.
Task 15 -Change Order Preparation and Processing. Assist the Client and contractor in
preparing and processing contract change orders.
Task 16 -Field Observation. Provide periodic field observation during construction to review
the work of the contractor to determine if the work is proceeding in general accordance with
the contract documents and that completed work appears to conform to the contract
documents. Staffing requirements may be adjusted during the project in relation to the level
of construction activity.
Task 17 -Conformance Updates to Client as Needed. Report to the Client any work believed
to be unsatisfactory, faulty or defective or does not conform to the contract documents, and
advise Client of any work that should be corrected or rejected.
Task 18 -Evaluate Contractor's Suggestions for Modifications. Consider and evaluate
contractor's suggestions for modifications and report them with recommendations to the
Client.
Task 19 -Maintain Files During Project. Maintain files for correspondence, reports of the job
conferencesI shop drawings and sample submissions, reproductions of original contract
documents including addenda, change orders, field modifications, additional drawings issued
subsequent to the execution of the contract, Engineer clarifications and interpretations of the
contract documents, progress reports and other project -related documents.
Task 20 -Review of Project. Participate in a review of the project with the Client and review
staff near project completion and prepare a list of items to be completed or corrected.
Task 21 -Field Observation of Completed Project. Participate in a field observation of the
completed project with the Client and review staff before a final application for payment is
processed for the contractor.
Task 22 -Revised Plans Showing Changes Made During Construction. Provide the Client
with a copy of revised drawings of the construction plans for the project based on the
construction observation records of the review staff and contractor showing those changes
made during construction considered significant.
Task 23 -Flow and Drawdown Data Review. AECOM will compile and review collected flow
and drawdown data from the pump testing completed by the contractor for the basis of future
permanent dewatering system for the clarifier complex. ML-. will submit a report of the
results from the testing to the City. The report will include recommendations for moving
forward with a permanent dewatering system based on the City's desired outcome.
AECOM
Page 4
Task 24 -Documentation Close
-Out. Assist the Client with the final close-out documentation
from the contractor.
lll. Compensation
Compensation for the above services will be on an houriy basis in accordance with Part VI of
the original agreement and shall be integrated with the fees in the original agreement. The
estimated fee is Ninety -Nine Thousand Dollars ($99,000.00).
IV. In all other respects, the obligations of the Client and the Consultant shall remain as specified
in the Professional Services Agreement dated October 16, 2017,
1N WITNESS WHEREOF, the parties hereto have executed this Supplemental Agreement No. 1 as
of the dates shown below:
AECOM TECHNICAL SERVICES, INC.
Douglas G1�1-�ehindel, P,E.
Associate Vice President
APPROVED FOR CLIENT:
13y:
Date Aoril 8, 2020
Date
0:1AdministratlonWGREEISUPPLEISAI WAT Dewatering for Final Clarifier.docx