CM-2024-024 - 1/19/2024STATE OF TEXAS §
COUNTY OF WILLIAMSON §
SUPPLEMENTAL CONTRACT NO. 2
TO CONTRACT FOR ENGINEERING SERVICES
FIRM: PLUMMER AND ASSOCIATES, INC. ("Engineer")
ADDRESS: 8911 N Capital of TX Hwy, Building 1, Suite 1250, Austin, TX 78759
PROJECT: BCRWWS East WWTP Tertiary Filters Preliminary Engineering
Report (PER)
This Supplemental Contract No. 2 to Contract for Engineering Services is made by and between
the City of Round Rock, Texas, hereinafter called the "City" and Plummer and Associates, Inc.,
hereinafter called the "Engineer."
WHEREAS, the City and Engineer executed a Contract for Engineering Services, hereinafter
called the "Contract," on the 8th day of September, 2022 for the BCRWWS East W WTP Tertiary
Filters Preliminary Engineering Report (PER) Project in the amount of $506,672.00; and
WHEREAS, the City and Engineer executed Supplemental Contract No. 1 on September 14, 2023
to amend the scope of services and to increase the compensation by $788,073.00 to a total of
$1,294,745.00; and
WHEREAS, it has become necessary to amend the Contract to modify the provisions for the scope
of services and to increase the compensation by $40,463.50 to a total of $1,335,208.50;
NOW THEREFORE, premises considered, the City and the Engineer agree that said Contract is
amended as follows:
Article 2, Engineering Services and Exhibit B, Engineering Services shall be amended as set forth
in the attached Addendum to Exhibit B. Exhibit C, Work Schedule shall be amended as set forth
in the attached Addendum to Exhibit C.
Article 4, Compensation and Exhibit D, Fee Schedule shall be amended by increasing by
$40,463.50 the maximum amount payable under the Contract for a total of $1,335,208.50, as
shown by the attached Addendum to Exhibit D.
IN WITNESS WHEREOF, the City and the Engineer have executed this Supplemental Contract
in duplicate.
Supplemental Contract Rev.06116
g199�.2022336. ,4887�2-2�9144-66011�j 8427 y
PLUMMER AND ASSOCIATES, INC.
Digitally sipped by Stephen J. Coonan. P E
DN: [r US. E-s000nanoplummer.pem,
Stephen J. Coonan, P.E.4'Plurnmer,CN=`SlephenJ.Coonon,RE-
Reatar: Ihave reviewed this document
Date' 2a24 01 12 11 58t284O6'W
Date
Supplemental Contract Re%-.06!16
0199 202236,4872-2914.6011 84275
CITY OF ROUND ROCK
By: - 1: (2 , A 6 Z&4
4v Laurie Hadley, 0ty Manager
1
114 *Pl(
Date
Supplemental Contract
0199 202236,4872-2914-6011
APPROVED AS TO FORM:
Stephanie L. Sandre, City Attorney
Rev.W 16
842"S
PLUMMER
ADDENDUM TO EXHIBIT B
Engineering Services
BACKGROUND
Brushy Creek East Regional WWTP
Tertiary Filters Project
Design Amendment #2
0982-011-01
The purpose of this scope of services is to provide design and bidding professional services for
additional effluent tertiary filter treatment, with a 48 MGD peak flow capacity. The basis of design
is the Aqua -Aerobics MegaDisk® cloth media filter equipment. The original scope is an
amendment to the Effluent Filter PER project.
During the detailed design phase reviews, the Engineer proposed, and the Owner agreed that an
alternative disinfection conveyance, as well as reuse system connection. Additional gravity piping
would provide flexibility, and improved operational control of the system. This was not part of the
original scope of work and would incur some additional design listed below;
• Additional hydraulic calculations and profile sheets.
• Gravity conveyance piping from the proposed filter basin to the reuse pumping station
and to UV-1 complex.
• Additional junction boxes with slide gates and valve vault.
• Additional control slide gates and drop boxes at the new filter structure.
• Additional review of duct bank locations and other utility conflicts.
BAISC SERVICES
Plummer shall provide Additional Basic Services in accordance with the tasks described herein.
Task 2. Design
Task 6. OPCC and Construction Schedule
Task 7. Quality Review
The Engineer does not require any adjustment to the original proposed schedule for this project.
All other assumptions, scope, deliverables, and terms of the original agreement remain
unchanged.
FINAL 12:'2L f2j23
ADDENDUM TO EXHIBIT D
Fee Schedule
Attached Behind This Page
Exhibit D - Fee Schedule
Scope of Work �-
Brushy Creek Tertiary Filters Project W
COMPENSATION
Services shall be in addition to the current Lump Sum Fee, summarized below:
Original Contract Amount: $ 1,294,745.00
This Amendment: $ 40,463.50
Updated Contract Amount: $ 1,335,208.50
[Cost Breakdown for reference — lump sum]
Total $ 18.920 $ 21, 543.50 $40,463.50
RNAL 612 f 2323
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