Wood Contract Exhibit A

WOOd.

Wood Environment & Infrastructure Solutions, Inc.
October 6, 2021 4600 East Washington Street, Suite 600
Wood Proposal No.: PW21-08-02 R1 Phoenix, Arizona 85034

T: (602) 733-6000
F: (602) 733-6100
City of El Mirage www.woodplc.com
10355 N. 1218 Avenue
El Mirage, AZ 85335

RE: El Mirage WRF Expansion Project
Lump Sum Fee Proposal for Design R1

Dear Mr. Ketchmark:

Attached is our revised scope of services and fee proposal for providing engineering design services for
the City of El Mirage expansion project to expand the capacity of the El Mirage Water Reclamation Facility
to 3.15 million gallons per day (mgd). The project includes a new equalization basin, Sequencing Batch
Reactor (SBR) System, and surge tank, dewatering centrifuge along with other process equipment and
systems to meet the new flow requirements, and piping, valves, odor control, a new Blower Building with
blower equipment, and a building to enclose the influent channels and coarse screen with added odor
control.

The scope of services in this proposal includes civil, mechanical, electrical, HVAC, architectural, and
structural design work; geotechnical evaluation, survey, potholing, and preparation and submission of the
County ATC and City permits. The APP and AZPDES permits have 3.6 mgd ratings and do not need to be
modified. The fee for construction engineering services, including inspections, record drawings and
County AOC permit preparation will be provided within a subsequent services contract.

Please contact Ms. Kagie-Hay at (602) 733-6149, (480) 241-6622, or at andrea.kagie@woodplc.com with
any comments or questions.

We look forward to the opportunity to working with the City of El Mirage on this project.

Respectfully submitted,

Wood Environment & Infrastructure Solutions, Inc. Reviewed by:
fatto OL J fp
Andrea L Kagie-Hay, PE Tim LeClair, PE
Project Manager Sr. Project Manager
GAinfrastructure\W-WW\02-Proposals & SOQs\2021\PW21-08-02_El Mirage Expansion\6.0 Proposal or SOQ Submittal\El Mirage Expansion Design oy e)

Scope Prop R1 v2-0.docx

El Mirage WRF Expansion Project
Wood Proposal No.: PW21-08-02
October 6, 2021

1.0 Introduction

The City of El Mirage (City) owns and operates the El Mirage Wastewater Reclamation Facility (WRF); a
tertiary wastewater treatment facility designed with a capacity of 2.5 million gallons per day (mgd). The
facility operates using the Sequencing Batch Reactor (SBR) technology that currently has four (4) SBR
basins to meet capacity. The WRF influent flow is nearing 80% of its design capacity and the service area,
though limited in size, has the potential to increase flows to the plant at build out by approximately
500,000 gallons per day. The City has requested Wood to provide design services for an expansion of the
treatment capacity to 3.15 mgd.

Expansion of the facility will generally consist of additional equalization basin capacity, a new SBR basin,
expanded surge basin capacity, and additional process equipment and systems required to meet the
increased wastewater treatment capacity. The additional items include fine screen, pumps, blowers,
tertiary filter, odor control equipment, electrical systems, and controls. A new sludge dewatering
centrifuge and a back-up chlorination system are included in the scope of services

The project will require site investigations including survey, geotechnical investigations, and potholing.
Support disciplines include electrical and structural engineering. Heating, ventilation and air conditioning
(HVAC) and architectural services are included for the new Blower Building, and the new Influent Channel
building over the influent channels and screen. Both the Aquifer Protection Permit (APP) and the AZPDES
permit have ratings of 3.6 mgd and do not need to be modified. Typical approval-to-construct (ATC) and
City permits will be required, The preparation of pre-construction permits is included with our services.

Details of the design services to expand the facility to meet the future needs of the City are provided
below.

1.1 Background

Facility staff operates the 2.5-mgd SBR system, which produces Class B+ effluent. The facility is nearing
80% of its design capacity, which triggers the regulatory requirement to begin planning and design for
additional capacity. To meet future build-out requirements, the City is requesting a design to expand the
plant to keep up with the increasing demands expected from new residential developments that are
planned within the service area. This project will expand the treatment capacity of the plant and process
equipment essential to operation of the new processes and systems.

1.2 Scope of Design Services / Project Understanding

The El Mirage WRF expansion project includes not only the installation of new treatment basins, but
additional process upgrades to ensure unit processes meet the needs of the expanded capacity of the
plant, and to provide operational flexibility. The following is a summary of the main components that will
be included in the design documents to construct the new facilities:

Plant Expansion Features

¢ Additional Fine Screen Capacity
© Location of screening equipment will be considered with regard to space and operational
aspects of the expanded Equalization (EQ) Basin

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EI Mirage WRF Expansion Project
Wood Proposal No.: PW21-08-02
October 6, 2021

o HVAC - for heating/cooling and ventilation requirements in new buildings and assistance
with odor control ducting

Electrical Assumptions: Based on existing drawings, this proposal assumes the existing SES and generators
are both sized to provide supply power for the new equipment. The design will provide a new breaker to
power the new MCC. The PLC cabinet design for controls is to be provided by the SBR manufacturer; PLC
and SCADA programming to be performed by others and are not provided in this scope of services, The
proposal also assumes the existing grounding system is sufficient to provide the required additional
equipment protection.

Key design requirements include:

e New EQ Basin to be hydraulically connected to the existing EQ Basin. The design will need to
allow flow through the headworks and into either basin. Neither will require a direct connection
to or from the influent pump station.

e New Surge Basin to be hydraulically and operationally connected to the existing Surge Basin.

* Relocation of the existing manhole and sewer piping located towards the north side of the facility,
near the west side of SBR 3, is to be avoided in the plant expansion design if possible.

*Deferred Submittal Notes:

The pre-engineered metal building will be designed as a deferred submittal. Wood will provide the
preliminary structural foundation design and required specifications for the contractor to procure a pre-
engineered building meeting the design criteria provided. Design elements for the pre-engineering
building have the following inclusions and exclusions:

Includes pre-engineered metal building (PEMB) specifications
Includes related specifications, e.g. Doors and Openings
Includes schematic plans, as required, to develop building specifications
Includes preliminary structural foundation design
© Design to be confirmed/updated during construction to coordinate with the building
manufacturer's approved shop drawings
¢ Includes ventilation design in conjunction with the ionization odor control
e Includes electrical supply to the building
¢ — Excludes interior building electrical design, such as outlet receptacles and lighting
¢ Excludes redesign of building or foundation after PEMB manufacturer has completed their design
(may be added as an additional service with the construction services)
e Excludes building design drawings (building will be shown essentially as a box)
o Manufacturer is to provide sealed engineering design of building during construction
e Excludes renderings of building and/or building elevations during design

If during permitting additional design work is required to obtain initial permits to start the project
construction, Wood can add these design services by change order to the contract.

The following scope of service tasks are required for execution of the project.

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El Mirage WRF Expansion Project
Wood Proposal No.: PW21-08-02
October 6, 2021

Task 2100 — Background Investigations

Wood will review and utilize the background information relevant for the project design. This task consists
of gathering, organizing, and reviewing available information, including record drawings, equipment
nameplate data, permits, and plant operational and performance data. Wood will work with plant
personnel to identify project constraints.

Land Survey

The land survey will identify the surface contour elevations and locate coordinates of the existing
surface features, soil boring locations and underground features that are identified by review of
existing records and the potholing activity. Site facility locations will be in accordance with the
Arizona Plane Coordinate (1983) System Datum and North American Vertical Datum of 1988
(NAVD 88).

Geotechnical Investigations

Geotechnical investigations will include soil borings to determine soil characteristics and
structural load capacity of the underlying soils of the new EQ, SBR, and Surge Basin. The proposal
includes up to 7 borings, each up to 35 feet deep. Data from a previous boring for Filter #4 will be
used along with the other borings for the new Influent Channel Building foundation
consideration. Wood geotechnical engineers and/or geologists will supervise the field
investigation to be performed by a sub-contracted drill rig and drill crews. Laboratory testing will
be performed to provide data for the engineering analysis. A geotechnical report will be prepared
to document the localized site conditions for design and construction.

Potholing

It is anticipated that existing underground utilities are not located on record drawings, or not
located in accordance with the available documentation. The proposal includes a potholing
allowance to uncover the location and depths of buried utilities. A detailed proposal will be
developed with costs that will be submitted to the City for approval before proceeding with the
work,

Task 2200 - Conceptual Design

Wood will develop a conceptual design of the facility for discussions with the City. The conceptual design
will present the basic features and arrangements of equipment and systems for the expanded plant. The
basic layouts include the EQ Basin, SBR Basin, expanded Surge Basin, Blower Building, new centrifuge, and
existing centrifuge relocation. The presentation of the conceptual design will be directed to focus on key
design approaches, including screen installation, EQ basin and Surge basin hydraulic connections, and
centrifuge layout/relocation. The discussions will focus on making decisions on key equipment and
layouts, as well as making preliminary selections on major equipment.

In the conceptual design task, Wood will develop a Table of Contents (TOC) for the Technical
Specifications to be developed for the project. Outlines of the major equipment design criteria will be
included.

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El Mirage WRF Expansion Project
Wood Proposal No.: PW21-08-02
October 6, 2021

Task 3300 - Opinion of Probable Construction Costs Update

The quantity takeoffs and equipment pricing will be reviewed, and the opinion of probable construction
costs will be modified based on updated cost and quantities information developed in the 60% design.

2.4 Task 4 - 90% Design Services

Wood will continue to develop the design documents up through a 90% level, including the full set of
technical specifications and incorporating comments from the City at the 60% design review meeting. The
90% design documents can be shared with contractor(s) for additional design critique, if the City should
chose to follow a Construction-Manager-at-Risk (CMAR) project delivery. These design documents will be
ready for submittal for permit application pending any final comments from the City and contractor(s), if
any, at the 90% design review meeting. This submittal will include an updated design report, technical
specifications, and opinion of probable construction costs.

Task 4100 — Technical Specifications Update

A complete set of technical specifications will be available with the 90% design documents; this excludes
the front-end specifications. The Bid Preparation Allowance can be used to prepare front-end
specifications and other bid documents in coordination with the City, as needed. The specific scope will be
developed with the City once the construction approach is determined.

Task 4200 - Design Report Update

The Design Report will be updated to reflect modifications necessitated by the design process. The Design
Report will be submitted with the MCESD ATC permit application.

Task 4300 - 90% Drawings

Drawings of the 60% design phase will be advanced to the 90% design, including the incorporation of
comments from the 60% design review. The drawings will describe and detail the project for construction
by a competent contractor.

Task 4400 - Opinion of Probable Construction Costs Update

The quantity takeoffs and equipment pricing will be reviewed, and the opinion of probable construction
costs will be refined based upon updated cost and quantities information. The cost estimate will be in
accordance with an American Association of Cost Engineers (AACE) Estimate Class 2.

2.5 Task 5 - 100% Design Services

The 100%, or final, design documents will incorporate comments provided by the City based on the 90%
submittal review and will serve as the set of construction documents.

Task 5100 - 100% Design Set

The final design documents will be sealed and signed by an Arizona-registered Professional Engineer for
each discipline. The sealed design documents will be submitted to MCESD and the City. Comments
received from MCESD and City permit applications will be addressed and a final conformed set of design

Page 7 ©

—,

)

El Mirage WRF Expansion Project
Wood Proposal No.: PW21-08-02

October

6, 2021

A Fee Proposal table, showing the estimated hours by task, is presented in Attachment A. The fee table is
not to be considered as the basis for billing but is provided for informational purposes.

Hours are assigned in the Fee Proposal table for the following team members:

VVVVVV VV VV VV VV V

The fee

QA/QC — Quality Assurance/Quality Control Engineer

PM — Project Manager

SME — Subject Matter Expert

PE — Project Engineer

EIT — Engineer-in-Training

SrEE — Senior Electrical and Instrumentation & Controls Engineer
EE — Electrical and Instrumentation & Controls Engineer
SrSE — Senior Structural Engineer

Sr. GEO ~ Senior Geotechnical Engineer or Geologist

GEO - Geotechnical Engineer or Geologist

HVAC — Heating, Ventilating and Air Conditioning Engineer
CAD -Computer-Aided Designer

ECAD - Electrical Computer-Aided Designer

SCAD — Structural Computer-Aided Designer

ADM - Administration/Clerical

and proposal exclude the following scope of service items:
SCADA programming
Hydrogeological Report
APP Amendment
AZPDES Update
Permit Fees
SKM electrical transient analysis
Full PEMB design (see notes in section 1.2)
Redesign work for PEMB building elements and/or foundation after PEMP manufacturer has
completed design
Construction Engineering Services
o Submittal Review / RFI Response and Conflict Resolution
o Inspection Services
o Materials Testing
o Change Order Reviews
o Associated Project Management, Coordination, Construction Meetings, and Direct Costs
MCESD Approval-Of-Construction (AOC) Permitting Assistance
Record Drawings

Wood can provide the last 4 items under a separate construction management services agreement.

Page 9

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