2-26 001E Pre-liminary Scope of Work.pdf

Preliminary Scope of Work Page 1 of 4 September 2025

CITY OF DALLAS

DALLAS WATER UTILITIES

SORCEY PUMP STATION AND DISTRIBUTION FACILITIES MAJOR

MAINTENANCE DESIGN

CONTRACT 26-001 E

PRELIMINARY SCOPE OF WORK

OVERVIEW:

The City of Dallas (City), through Dallas Water Utilities (DWU), is requesting Statements of Qualifications (SOQs) from Consulting Engineering firms to provide engineering services required to prepare an assessment and comprehensive plan for major maintenance of Dallas Water Utilities Department (DWU) owned distribution facilities, including pump stations and elevated water storage tanks.

The consultant shall perform an investigation, study, or site assessment of DWU’s pump stations identified in Attachment A. The Engineer shall investigate each item, evaluate alternatives, and provide recommendations for improvements that align with DWU’s operational goals and long-term planning. In addition to the general assessment, the consultant shall specifically address the following two priority initiatives:

• Sorcey Customer City Pump Improvements:

Design upgrades to increase pumping capacity to meet growing demands in the customers’ cities and to comply with regulatory requirements. Scope includes hydraulic analysis, pump sizing, and associated electrical improvements.

• Valve and electrical improvements at Various facilities:

Evaluate and design improvements at multiple pump stations, including valve replacements, drainage enhancements, protective coatings, surge mitigation, actuator upgrades, HVAC modifications, and intake improvements. Electrical improvements include new motor control centers (MCCs), lighting panels, transformers, switchboards, and valve and actuators replacements.

PROJECT BACKGROUND AND OBJECTIVE:

Dallas Water Utilities (DWU) owns and operates an extensive water delivery system that provides drinking water and fire flow protection to approximately 2.5 million people, including the City of Dallas, DFW International Airport, and 23 nearby customer cities.

Preliminary Scope of Work Page 2 of 4 October 2025

DWU’s water delivery infrastructure includes:

• 30 potable water pump stations housing approximately 150 pumps ranging from 5 hp to 3,500 hp with a combined pumping capacity of approximately 3 billion gallons per day.

• 23 water storage tanks, including 10 elevated and 13 ground storage tanks, which provide critical storage capacity and pressure stabilization across the system.

• 101 pressure reducing valves (PRVs) and over 5,000 miles of water mains that support the distribution network.

As these facilities and equipment age, and as system demands increase, DWU must continue to modernize and upgrade its infrastructure to meet regulatory requirements, improve operational efficiency, and ensure long-term system reliability. This project will provide engineering services for the investigation, preliminary design, final design, construction documents, bid phase services, construction administration, and start-up of improvements to DWU’s water delivery facilities, including pump stations and elevated water storage tanks.

Attachment A includes a list of major maintenance and improvement items identified across DWU’s water delivery infrastructure. These items are categorized as follows:

1. Pump Station Equipment Evaluation, Replacement, and/or Repair

2. Elevated Storage Tank Coating Assessments.

3. Electrical System Improvements

4. SCADA/PLC and Instrumentation Upgrades

5. Site Security and Access Enhancements

The Engineer shall investigate each item, evaluate alternatives, and provide recommendations for improvements that align with DWU’s operational goals and long-term planning.

The consultant shall build upon previous reports and design information included in the 2021 Water Delivery Comprehensive System Assessment and Update (WDCSAU, Carollo, 2021).

Additionally, the consultant shall coordinate with upcoming recommendations from the DWU Security Master Plan.

Preliminary Scope of Work Page 3 of 4 October 2025

SCOPE OF WORK:

1. Sorcey Pump Station

Design upgrades to increase pumping capacity to meet growing demands in the customers’ cities and to comply with regulatory requirements. Scope includes hydraulic analysis, pump sizing, and associated electrical improvements.

2. Existing Pump Station Assessment

Attachment A identifies needs at different pump stations. The selected consultant shall create detailed documentation of the existing system to serve as a foundation for necessary upgrades and enhancements.

3. Design Report

Technical Memoranda (TMs) shall be consolidated into a single Design Report, which will serve as the 30% design submittal. The report shall include an executive summary (not exceeding four pages), an introduction, and individual chapters for each TM. As part of this report, the design team shall oversee a ranking and prioritization of project needs to align with a $40 to $45 million budget constraint. This prioritization shall consider all major components, including yard valve replacements at the Beltwood facility (designed by others), and will guide the selection and phasing of improvements to ensure the most critical elements are addressed with the available funding.

4. Plans and Specifications

Provide detailed plans and specifications based on the accepted recommendations of the Design Report above. Prepare detailed construction plans and specifications which comply with applicable Federal, State and local regulations and DWU's Standards. The plans shall also incorporate the design of yard valve replacements at the Beltwood facility, as prepared by others, ensuring proper integration and coordination with the overall project scope.

5. Services During Construction

Provide construction phase services throughout the duration of the project. These services shall include, but are not limited to, attending progress meetings, reviewing contractor submittals, responding to Requests for Information (RFIs), and reviewing proposed change order requests. The consultant shall coordinate closely with DWU staff and the construction contractor to ensure that the design intent is maintained and that any issues arising during construction are addressed promptly and effectively.

Preliminary Scope of Work Page 4 of 4 October 2025

6. Start-up, Training and Operations Assistance

a. A recommended maintenance program for all types of equipment.

b. As-built drawings.

c. Provide proper documentation of all enhancements or modifications of the existing SCADA network, including screen design drawings, reports, signal lists, and an explanation of the scope and scheme of the changes.

d. Assist in the execution of the start-up procedure.

Attachment A Pumping Operations Identified Needs and Location Maps

Category Facility Description Pumps Lone Star PS Pumps run 24/7 (possibly deadheading); assumed to be worn

Beltwood PS Rebuild half of the pumps Greenville PS 2 pumps rehabilitation Whispering Hills PS 2 pumps and motors South Cliff PS Improvements on pumps and motors Sorcey PS Pumps not operating at capacity Cypress Waters One 100hp pump out of service

Valves Elm Fork PS3 3-Valves at Meter Vault and Actuator (V7, V13, V17) Elm Fork PS3 Gate at JS2 leading to CW5 Cedar Crest PS Suction valves do not hold; discharge valves Red Bird PS V6 Alta Mesa PS Isolation valve from Camp Wisdom Line South Cliff PS Isolation valves

Electrical Bachman HSPS Power quality issues on VFD equipment Beltwood PS Safety and Reliability concerns with electrical gear Cedar Crest PS Electrical upgrade Red Bird PS Main electrical gear

Structural Abrams PS Water in manhole from potential leak Sunset PS Reservoir Evaluation Sorcey PS Reservoir Evaluation Cypress Waters Foundation issues

Mechanical Eastside WTP HVAC on TP1, TP2, and TP3 Hydraulics Sorcey PS System hydraulics make it difficult to fill reservoir Redundancy / Ops Lone Star PS Possibly unnecessary due to system redundancy; consider abandonment

Sorcey PS Cannot shut down for major work Protective Coatings and Painting Elevated Storage Tanks Forest Lane, Pleasant Grove, Trinity Heights – consider coating projects

Pump Station Painting Various pump stations to be determined Design/Planning Beltwood PS Coordinate design with Carollo Engineers PLC Upgrades Various Locations Maintenance list already exists

Attachment A: Pumping Operations Identified Neeeds

North High

B

A27 34

22 1

Abrams Pump Station ³

130 065 Feet

Central Low

Trinity Heights

Intermediate

Cedardale High

2 3

Alta Mesa

125 062.5 Feet

Central Low

Bachman High Service

125 062.5 Feet

Beltwood

370 0185 Feet

Beltwood

175 087.5 Feet

Trinity Heights Intermediate

7 A

10 12

Elm Fork Pump Station 3 ³

100 050 Feet

Elm Fork Pump Station 3 ³

70 035 Feet

D uc til e

Iro n

KF

L

28 20

Greenville

200 0100 Feet

KF

L

Greenville

80 040 Feet

Lone Star

Intermediate

Central Low

" D uc til e Iro n

Lone Star

10 05 Feet

Red Bird High

South High

Red Bird

50 025 Feet

Red Bird High

11 37

Sorcey

130 065 Feet

Cedardale High

C

Southcliff

260 0130 Feet

Southcliff

40 020 Feet

3 60

17 44

Sunset

200 0100 Feet

Whispering Hills

North High

4-W

Whispering Hills

10 05 Feet

KJ

KJ

KJ

KJ

UT

KJ

KJ

KJ

KJ

KJ

UT

UT

UT

UT

UT

UT

UT

UT

UT

UT

KJ

KJ

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Storage Tanks ³ 36,000 018,000 Feet