3-2- ATTACHMENT A - PROPOSED SCOPE OF WORK.pdf

ATTACHMENT A: PROPOSED SCOPE OF WORK

Scope of Work – St. George Regional Water Reclamation Facility Upgrades Project Overview

The existing SGRWRF receives and treats wastewater flows from the Cities of St. George, Ivins, Santa Clara, and Washington. A portion of the treated effluent is conveyed west via the existing SGRWRF reuse booster pump station. The City and District have identified the following new facilities at SGRWRF that are required for the SGRWRF Upgrades Project:

front end equalization storage, reuse filter capacity upgrades to existing filters, a proposed new filtration system, proposed chlorination system upgrades/expansion, and proposed new on-site reuse booster pump station. The SGRWRF Upgrades play a critical role in the overall System, providing non-potable reuse water for irrigation and agricultural exchange.

The City will manage the design, construction, and operations of all work at the SGRWRF.

The District is providing funding for the project and will provide financial oversight through the duration of the project.

General Scope The selected firm will be responsible for developing a scope of work for all phases of the project including, preliminary design, 30, 60, and 90 design submittals, a final set of construction documents for bidding, and engineering services during construction. The scope of work must adhere to the Design Deliverables included in Attachment B. The general scope for the SGRWRF Upgrades includes the following:

Front End Equalization Storage Design: Evaluate volume, footprint, site location, hydraulics, odor control, instrumentation, controls, electrical requirements, and operations.

Effluent Pump Station Design: Civil, structural, mechanical, electrical, and instrumentation design.

Chlorination System Design: Evaluate required chlorine demand, perform alternatives analysis for on-site generation and bulk storage. Provide design for and recommendation for the system.

Reuse Filter Capacity Upgrades & Proposed New Filtration System Design:

Evaluate upgrades and equipment for the existing and proposed reuse filtration systems.

Permitting Support: Support the City’s Project Manager and the Owner Advisor (Stantec) in preparing and submitting permit applications to the Department of Water Quality.

Coordination: Active participation in coordination meetings led by City, District, and/or Owner Advisor (Stantec). Firm is expected to collaborate with other selected firms to ensure design consistency and integration.

Construction Support: Provide engineering support during bidding and construction phases, including responses to RFIs, submittal reviews, and site visits.

Project Communication: If selected, the design professional must provide to the City and District the contact information for the president or owner of their firm.

A preliminary basis of design report shall be prepared summarizing the evaluation and recommendations, including conceptual designs and layouts. The development and acceptance of the report and technical memorandums (TM) will allow design decisions to be made, and regulatory input received, at the ideal time to efficiently perform design work and keep the project on schedule.

Support Resources Selected firm will be supported by:

Owner Advisor – Stantec, the Program Partners’ Owner Advisor, tasked with providing overall program support for the System.

System-wide Hydraulic Model – Provided by Stantec to ensure system wide coordination.

Design Engineering Guidelines and District’s Technical Specifications – DEGs for General, Pipeline, Pump Station, and Instrumentation and Controls will be provided, along with the City’s specifications, including front end documents.

CAD/BIM Standards – Autodesk Construction Cloud will house project models and drawings. Standard General Drawings will be provided as needed. General formatting and conventions will be defined.

Detailed Scope of Work The selected firm will be responsible for developing a scope of work for all phases of the project including, preliminary design, 30, 60, and 90 design submittals, a final set of construction documents for bidding, and engineering services during construction.

Additionally, the selected engineer must prepare an opinion of probable construction cost (OPCC) for major design milestones as outlined in Attachment B.

Key design features that must be considered for each of the main components of the SGRWRF Upgrades are outlined as follows:

Front-End Equalization Storage

Evaluate tank volume and footprint, site location, hydraulics and pumping, O&M and mixing/odor control equipment, electrical and control systems strategies (EI&C), and construction sequencing.

Reuse Filtration

Evaluate upgrades required to increase output 7 MGD to at least 25 MGD. This will be a combination of existing capacity (7 MGD) with replacement or expansion to the ultimate capacity of 25 MGD.

Evaluate footprint, site location, hydraulics, yard piping, architectural design, EI&C strategies, and all components necessary for a new reuse filtration system with an initial capacity of 18 MGD expandable to 25 MGD. Include an evaluation of how this new facility and the expansion of the existing reuse facility best fit into the overall hydraulic profile of SGRWRF.

Chlorination

SGRWRF currently uses bulk hypochlorite for final disinfection and to provide a chlorine residual prior to entering the City’s secondary reuse system. The selected firm will evaluate chlorine demand necessary for the increased flows and compare the continued use of bulk chlorine deliveries versus on-site generation of hypochlorite. The comparison between bulk chlorine deliveries and on-site generation of hypochlorite will include the following for both alternatives:

o Summary of advantages and disadvantages of each alternative, including preliminary cost estimates.

o Coordination with manufacturers to determine technical design and equipment installation requirements for both alternatives.

o Obtain manufacturer quotes to provide media and necessary appurtenances for cost estimating purposes.

o Develop 20% conceptual drawings for both alternatives.

The selected firm will evaluate chlorine contact time and preliminary layouts for new chlorine contact basins for flows to the Regional Reuse Purification System. It is assumed that the existing chlorine contact basins at SGRWRF will continue to be used for flows going to the City reuse system.

Evaluate the size, location, hydraulics, yard piping, and EI&C strategies needed for a new chlorine contact basin.

All evaluations will consider maximizing the use of existing facilities at SGRWRF while providing a reliable and efficient chlorination system.

Reuse Booster Pump Station

The proposed new reuse booster pump station at SGRWRF will send water east to the Regional Reuse Purification System. The new reuse booster pump station will be a stand-alone system inclusive of all required components to ensure a fully operational facility. It will include, but is not limited to, the following: yard piping, mechanical piping, site civil improvements, structural, and architectural improvements. The following subtasks listed below have been identified by the City and District specific to the new reuse booster pump station:

Evaluate pump station system hydraulics and pump selection.

Evaluate pump station mechanical piping layout and pre-design.

Evaluate architectural concept development for the pump station building.

Evaluate the required EI&C systems strategies.

Prepare preliminary design drawings.

Develop an engineer’s opinion of probable construction costs (EOPCC).

Develop a project implementation schedule.