GM-20-05-28-092 :e7Z BRUSHY CREEK
REGIONAL UTILITY AUTHORITY
A Partnership of Cedar Park. Leander. and Round Rack
SUPPLEMENTAL CONTRACT NO. 5
TO CONTRACT FOR ENGINEERING SERVICES
FIRM:WALKER PARTNERS/FREESE AND NICHOLS JOINT VENTURE ("Engineer")
ADDRESS: 804 Las Cimas Parkway, Suite 150,Austin, TX 78746
PROJECT: BCRUA Phase 2 Raw Water Delivery System
This Supplemental Contract No. 5 to Contract for Engineering Services is made by and between
the BRUSHY CREEK REGIONAL UTILITY AUTHORITY, INC., hereinafter called
"BCRUA" and Walker Partners//Freese and Nichols Joint Venture, hereinafter called the
"Engineer".
WHEREAS, BCRUA and Engineer executed a Contract for Engineering Services, hereinafter
called the "Contract", on the 28th day of November, 2018 for the BCRUA Phase 2 Raw Water
Delivery System Project in the lump sum amount of$12,518,037.00 for Engineering Services
excluding Task 5.3.1 —Geotechnical Investigation; and
WHEREAS, BCRUA and Engineer executed Supplemental Contract No. 1 on April 24, 2019 to
amend the scope of services, specifically, Task 6.0, and to increase the compensation by
$75,496.00 to a total lump sum amount of $12,593,533.00 for a total project amount of
$13,697,291.00; and
WHEREAS,BCRUA and Engineer executed Supplemental Contract No. 2 on August 7, 2019 to
amend the scope of services, specifically, Task 5.0 — Special Services, and to increase the
compensation by $42,348.00 to a total lump sum amount of$12,635,881.00 for a total project
amount of$13,739,639.00; and
WHEREAS, BCRUA and Engineer executed Supplemental Contract No. 3 on March 5, 2020 to
amend the scope of services, specifically, Task 6.0—Agency and Stakeholder Coordination, and
to increase the compensation by $47,000.00 to a total lump sum amount of$12,682,881.00 for a
total project amount of$13,786,639.00; and
WHEREAS, BCRUA and Engineer executed Supplemental Contract No. 4 on March 20, 2020
to amend the scope of services, specifically, Task 6.0 — Agency and Stakeholder Coordination,
and to increase the compensation by $18,155.00 to a total lump sum amount of$12,701,036.00
for a total project amount of$13,804,794.00; and
WHEREAS, it has become necessary to amend the Contract to modify the provisions for the
scope of services, specifically, Task 5.3.1 — Geotechnical Investigation, by reducing the
compensation by $256,761.00 and adjusting the total Time and Materials amount to
Supplemental Contract Rev.03/2011
0140.4634-47;00441484 215829
$846,997.00; and to reallocate $256,761.00 to Task 5.0 — Special Services and Task 6.0 —
Agency and Stakeholder Coordination, and to modify the provisions for the scope of services for
Task 5.0 by increasing the compensation by $24,212.00 to a total lump sum amount of
$12,982,009.00 for a total project amount of$13,829,006.00;
NOW THEREFORE, premises considered, BCRUA and the Engineer agree that said Contract
is amended as follows:
I.
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.
II.
Article 4, Compensation Exhibit D, Fee Schedule shall be amended by reducing by $256,761.00
the Time and Material amount payable under the Contract for Engineering Services, specifically,
Task 5.3.1 — Geotechnical Investigation to a total amount of $846,997.00; and reallocating
$256,761.00 to Task 5.0 — Special Services and Task 6.0 — Agency and Stakeholder
Coordination, and modifying the provisions for the scope of services for Task 5.0 by increasing
the compensation by $24,212.00 to a total lump sum amount of$12,982,009.00 for a total project
amount of$13,829,006.00, as shown by the attached Addendum to Exhibit D.
IN WITNESS WHEREOF, BCRUA and the Engineer have executed this Supplemental
Contract in duplicate.
[signature pages follow]
2
WALKER PARRT�N_ERRS/FREESE AND NICHOLS JOINT VENTURE
By: _ C %r,�l 6L, '4�
Geor e E. Walker,Jr. Drew Hardin
27 May 2020 28 May 2020
Date
BRUSHY CREEK REGIONAL UTILITY AUTHORITY,INC.
By: /,,,ctl "
Karen Bondy, Ge eral Manager
5/28/2020
Date
APPROV D S TO FORM:
By. /v
Stephan 1. Sheets,BCRUA Attorney
3
ADDENDUM TO EXHIBIT B
ENGINEERING SERVICES
GENERAL
The objectives of this supplemental amendment are as follows:
■ The basis of design for the Raw Water Pump Station assumed the use of medium voltage
reduced voltage soft starters (RVSS)for the BCRUA/Leander pumps and two 30-ton air-
cooled split systems with interior pad-mounted air handling units and condensing units to
cool the electrical room. This design was assumed during the preliminary engineering phase
in 2016 due to PEC approval of the use of RVSS. During the final design phase, PEC
evaluated the starting method approved during preliminary design and determined that
VFDs are now required instead of RVSS to mitigate voltage drop due to increased loads on
the PEC Nameless substation. This design modification requires additional HVAC, electrical,
and process engineering services to design air cooled VFDs for the 15 MGD and 30 MGD
BCRUA/Leander pumps and two 120-ton rooftop mounted, custom packaged water-cooled
A/C units to handle the resultant increase in heat load.
■ Provide additional engineering services related to the design of a sodium permanganate
storage and feed system and at the Raw Water Pump Station. This treatment system is in
addition to the two chemical delivery systems at the maintenance building site assumed in
the basis of design. The OWNER WTP currently doses sodium permanganate at the existing
raw water floating pump station to provide oxidation and treatment of disinfection
byproduct(DBP)precursors and to assist in the reduction of total organic carbon (TOC). To
provide a similar treatment strategy with the proposed Raw Water Pump Station, a new
sodium permanganate storage and feed system will be utilized to continue to reduce the
DBP precursors and TOC.
■ Provide additional engineering services for raw water quality instrumentation at Raw Water
Pump Station as directed by OWNER. Raw water from the BCRUA/Leander header will be
sampled and analyzed using online analyzers. The design will be based on providing
instruments to supply the following data: (1) turbidity, (2)hardness, and(3) alkalinity. A
common sample tap from the BCRUA/Leander header will supply raw water to an
instrument panel. The instrument panel will include the sample piping, valves, raw water
sample drain, and analyzer waste drain. The raw water sample drain and drains from
analyzers that do not use regents will be reintroduced into the main shaft. Waste streams
generated from analyzers that utilize reagents will be drained to the waste sump.
■ Modify the risk management approach to include a quantitative cost assessment and
engage the services of Moonin Associates to facilitate review and integration of risk
mitigation strategies into the 90%design submittal.
■ Address additional effort required to address comments by the Lower Colorado River
Authority(LCRA) on the supplemental Tier 1 Hydrologic Modeling Guidelines report being
prepared by the U.S. Army Corps of Engineers (USACE).
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BASIC SCOPE OF SERVICES
Task 5.0-Special Services
Insert Task 5.10 through 5.12 as follows:
5.10 Additional Engineering Services for VFD Design
5.10.1 HVAC Design
5.10.1.1 Evaluate air-cooled and water-cooled systems that can satisfy the 120-
ton cooling demand of the VFDs.
5.10.1.2 Equipment selection and design of water-cooled HVAC units.
5.10.1.2.1 Evaluate make-up water supply(raw water) for the water-
cooled units including temperature, hardness, and turbidity.
Select HVAC materials of construction compatible with water
quality including piping, heat exchanger, and dirt separator.
5.10.1.2.2 Size water piping system and design connection to discharge
header and drain.
5.10.1.2.3 Design dirt separator to remove sediment that could clog the
control valve or damage the heat exchange coils.
5.10.1.2.4 Design heat exchanger to mitigate impacts of zebra mussel
attachment and fouling.
5.10.1.2.5 Coordinate with chiller servicing companies on maintenance
recommendations and availability.
5.10.1.2.6 Develop service platform performance specification to provide
access for operators and maintenance technicians.
5.10.1.2.7 Design equipment mounting and ductwork penetration details
for roof installation and penetration.
5.10.1.2.8 Review and design of vibration isolation and sound
attenuation inclusive of spring isolators for A/C units, duct
baffle-type silencers for supply, return, outside, and relief air
A/C unit connections, and sound attenuation blankets for
compressors to adhere to noise limits at the property line.
5.10.2 Electrical Design
5.10.2.1 Coordinate with pump suppliers to re-select pumps for use with VFDs.
Reviewed preliminary pump data to ensure compatibility.
5.10.2.2 Obtain detailed motor parameters from pump supplier engineering
department for pump selection.
5.10.2.3 Create an expanded ETAP model for BCRUA pumps with VFDs.
5.10.2.4 Modify and analyze RWPS motor start studies in ETAP for pump station
voltage profile and utility voltage dip. Verify an all-VFD pump station
would work within the plant voltage criteria and utility voltage criteria.
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5.10.2.5 Provide VFD criteria for BCRUA pumps for manufacturers. Meet with
manufacturers and review of initial selections.
5.10.2.6 Produce diurnal heat curve for HVAC and coordinate VFD cooling
requirements with HVAC for the RWPS with all VFD-driven pumps.
5.10.2.7 Create new electrical room design and layout to accommodate an all-
VFD RWPS. Coordinate with architectural, structural, and HVAC for
physical requirements and modifications.
5.10.2.8 Develop control scheme to integrate BCRUA pump VFDs with pump
control valves and pump protection systems.
5.10.3 Process Mechanical Design
5.10.3.1 Update transient to include HVAC supply system on the discharge side
of the pump station to prevent damage from adverse surge pressures
created by the pumps.
5.11 Additional Engineering Services for Sodium Permanganate Delivery System
5.11.1 Process Mechanical Design
5.11.1.1 Sodium Permanganate Storage System
5.11.1.1.1 Design a sodium permanganate storage system with a design
approach similar to the Raw Water Intake Maintenance
Building.
5.11.1.1.2 The system will include one (1) fiberglass reinforced plastic
(FRP) single-wall tank with a volume not to exceed 5,300
gallons and one (1) high-density polyethylene (HDPE) singe-
wall day tank. Both tanks will be located within the
containment structure described below.
5.11.1.1.3 The containment structure will consist of a cast-in-place
concrete structure sized to meet the requirements of 30 Texas
Administrative Code Chapter 290 and the requirements of the
Travis County Fire Marshall (accommodating a 25-year, 24-
hour storm event in addition to a chemical release).
5.11.1.1.4 The containment structure will include a sump with one
manually operated sump pump to allow operations and
maintenance staff to remove collected rainwater.
5.11.1.2 Sodium Permanganate Feed System
5.11.1.2.1 Design a sodium permanganate feed system that utilizes
diaphragm pumps. The Raw Water Intake Maintenance
Building chemical feed systems utilize peristaltic (tube)
pumps; however, the feed system at the Raw Water Pump
Station will require the use of diaphragm pumps to overcome
the raw water header pressure.
5.11.1.2.2 The feed system will be designed for the dosing of neat
chemical (no carrier or dilution water).
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5.11.1.2.3 The feed system will be enclosed in a building dedicated to the
chemical feed system.
5.11.1.2.4 The exterior sodium permanganate piping will utilize a pipe
chase, where feasible, to provide access to the chemical
piping. Piping located inside of the Raw Water Pump Station
will be stainless steel (type 316) to accommodate chemical
compatibility and required pressures. Sodium permanganate
will be dosed at one location on the branch side of the 84-inch
tee associated with the BCRUA header. Spare taps will be
provided near this injection location.
5.11.2 Structural Design
5.11.2.1 The sodium permanganate storage system will include a cast-in-place
concrete containment structure with screening walls. The storage
facility will not be fully enclosed to mitigate code compliance concerns
associated with chemical storage systems.
5.11.2.2 The sodium permanganate feed system will be located within a single
room building of similar construction to the Raw Water Pump Station
and Raw Water Intake Maintenance Building.
5.11.3 Architectural Design
5.11.3.1 The chemical storage feed and storage facilities will have architectural
elements similar to the Raw Water Pump Station and Raw Water Intake
Maintenance Building.
5.11.3.2 The chemical feed building will include one double door.
5.11.4 Heating, Ventilating, and Air Conditioning (HVAC) Design
5.11.4.1 The chemical feed building will include unit heaters and ventilation
(fans and louvers).
5.11.4.2 Air conditioning systems are not included as part of the design.
5.11.5 Plumbing Design
5.11.5.1 The chemical feed building will be provided with floor drains connected
to the floor drain collection system at the Raw Water Pump Station.
5.11.5.2 Emergency eyewash/showers will be provided within the chemical feed
building and near the chemical tank fill station. Water supply will be
provided by the 2-inch potable water line from the Cedar Park WTP.
5.11.6 Electrical, Instrumentation, and Controls
5.11.6.1 Electrical, instrumentation, and controls to support the proposed
storage and feed system.
5.11.7 Site Civil Design. Develop grading, yard piping, paving modifications for proposed
facility.
5.11.8 Opinion of Probable Construction Cost (OPCC). Develop OPCC for the sodium
permanganate storage and feed system.
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5.12 Additional Engineering Services for Raw Water Pump Station Raw Water Quality Monitoring
5.12.1 Process Mechanical. Design instrument panel to accommodate the required
instrumentation.The panel will allow for a constant flow of water to maintain a
representative sample. Prepare process diagrams and specifications.
5.12.2 Plumbing. Modify drain system to accommodate the two drains associated with the
raw water quality instrumentation panel. One drain will be dedicated to flows that
are able to be returned to the main shaft. The second drain will be dedicated for
flows that cannot be returned to the wetwell due to a use of a reagent.This second
drain will be connected the drain collection sump.
5.12.3 Electrical, Instrumentation, and Control. Design electrical, instrumentation, and
control to support the proposed instrumentation.
Modify Task 5.4 Risk Management Plan as follows:
5.4 Risk Management Plan
5.4.2 Risk Management Updates. Develop a 90% and 100% update to the risk register
and Risk Management Plan. Verify risk mitigation measures are incorporated in
the 90% and 100% design submittals. Quantitatively evaluate risk and mitigation
requirements during the 100% risk register update to develop a risk mitigation cost
estimate per current best practice standards. Engage services of Moonin
Associates to facilitate development and review of the 90% risk register update
including an independent review of the 90%submittal.
Task 6.0-Agency and Stakeholder Coordination
Insert Task 6.4.9.5 as follows:
6.4.9.5 Additional Engineering Services for USACE Hydrologic Modeling
Guidelines Tier 1 Report coordination with LCRA. Provide a copy of the
Draft Hydrologic Modification Analyses of the Proposed BCRUA Intakes
Technical Memorandum to the LCRA for review. Obtain comments
from LCRA and participate in three teleconference calls. Revise the
Technical Memorandum to address LCRA comments. Provide the
revised Final Draft Technical Memorandum to OWNER, OWNER counsel,
and LCRA for review. Finalize Technical Memorandum to submit to
USACE.
O'Fenalker Partnersrm 'NICHOLS
FREESE
5/26/2020 gineers . surveyors
ADDENDUM TO EXHIBIT C
WORK SCHEDULE
No changes to the Work Schedule are required.
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5/26/2020 engineers . surveyors 'RICNO`S
ADDENDUM TO EXHIBIT D
Fee Schedule
Attached Behind This Page
ADDENDUM TO EXHIBIT D
COMPENSATION
Total compensation for Basic Services Task 5.3.1 — Geotechnical Investigation shall be reduced by
$256,761 to $846,997. Total compensation for Task 5.0 — Special Services shall be increased by an
amount of $247,761 to $3,455,721. Total compensation for Task 6.0 — Agency and Stakeholder
Coordination shall be increased by an amount of$9,000 to$1,374,096.
Net compensation for Supplemental Amendment No. 5 is$24,212.
Total compensation for Task 5 — Special Services shall be increased by an amount of $24,212 to
$3,479,933.
Total compensation for Lump Sum tasks shall be adjusted from $12,701,036 to$12,982,009.
Total compensation for Time and Materials shall be adjusted from $1,103,758 to $846,997.
Total compensation for the Project shall be adjusted from $13,804,794 to$13,829,006.
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