EXHIBIT B1

PRELIMINARY DESIGN CRITERIA

Overview

This section identifies minimum preliminary design criteria to be considered by the Contractor for the rehabilitation of the Peachtree Raw Water Pump Station. The Contractor shall be responsible for providing a complete and final design criteria in the Design Development Report (DDR) in adherence to applicable Building Codes, Local Regulations, and City of Atlanta Standards. In the case of any conflicts between these Preliminary Design Criteria requirements and the City of Atlanta (the City) Standards, the most current version of the City of Atlanta Standards shall govern.

The Contractor shall be responsible for developing any specification requirements not defined in the current City Standards and which are deemed necessary by the Contractor’s design team during the design phase.

Building Codes

All work for this project shall follow the current Mandatory Codes as adopted by the Georgia Department of Community Affairs (DCA) for construction projects in the State of Georgia (https://www.dca.ga.gov/local-government-assistance/construction-codes-industrialized-buildings/construction-codes):

International Building Code, 2018 Edition, with Georgia Amendments (2025)

International Residential Code, 2018 Edition, with Georgia Amendments (2024)

International Fire Code, 2018 Edition, with Georgia Amendments (2020)

International Plumbing Code, 2018 Edition, with Georgia Amendments (2024)

International Mechanical Code, 2018 Edition, with Georgia Amendments (2024)

International Fuel Gas Code, 2018 Edition, with Georgia Amendments (2022)

National Electrical Code, 2023 Edition

International Energy Conservation Code, 2015 Edition, with Georgia Supplements and Amendments (2023)

Life Safety Code, NFPA 101, 2018 Edition, with Georgia Amendments (2020)

The City of Atlanta has adopted the International Existing Building Code for work on existing buildings:

International Existing Building Code, 2018 Edition, with Georgia Amendments (2021)

Any reference herein to Building Code or Code (when used standalone) shall refer to the requirements in the codes identified above.

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Local Regulations and Standards

All construction work shall be completed in accordance with the City of Atlanta Code of Ordinances, and the City of Atlanta’s Standards including guide specifications and standard details.

Field Investigations

Topographic Survey and Subsurface Utility Engineering (SUE)

Perform a topographic survey to identify parcel and right-of-way lines; site topography; existing ground-level features such as pavements, driveways, slabs, building structures, vaults, trees; storm sewer and sanitary sewer structures and lines; water lines, valves, hydrants; and all other features as necessary for the completion of the design.

The survey shall be prepared in accordance with current GDOT standards, and to the following specifications:

o Horizontal datum: NAD 1983 (2011) o Vertical datum: NAVD 1988 o Coordinate system: SPC GA WEST o Horizontal Scale: 1” = 50’ o Contour interval: 2-foot vertical

The location, species and diameter at breast height (DBH) of all trees in the work area shall be shown on the survey.

The Contractor’s surveyor shall provide a signed and sealed survey at the completion of the 60% design.

Perform a Subsurface Utility Engineering (SUE) investigation within the project area to a SUE Quality Level (QL) B conforming to GDOT standards. Identify on the topographic survey the location of existing underground utilities. Perform tests holes (soft digs) to SUE QL A where deemed necessary for the design to determine the elevation of underground utilities crossing proposed yard piping and ductbanks.

Existing pavement impacted as a result of the SUE work shall be repaired.

Geotechnical Investigations

The soil and subsurface conditions at the locations of new building structures and slabs shall be investigated to provide geotechnical recommendations for the foundation design.

The Contractor’s geotech engineer (soils engineer) shall perform the geotechnical investigations in accordance with industry standards and best practices, including but not limited to, the Georgia DOT Foundation Drilling and Sampling guidelines.

The spacing, number and depth of borings shall be determined by the Contractor’s geotech engineer as necessary to complete the design.

Perform Standard Penetration Tests (SPT) in intervals determined by the Contractor’s geotech engineer, and in conformance to ASTM D-1586.

Determine groundwater level and presence of rock as confirmed by auger refusal.

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Laboratory testing of soil samples shall be conducted as required to inform foundation designs, including classification using the Unified Soil Classification System (USCS), Atterberg limit determination, moisture content, sieve analysis, organic content, environmental classification testing, and rock tests if applicable.

The Contractor shall prepare a geotechnical report containing the findings, conclusions, and recommendations along with supporting field and laboratory data. The report shall include recommendations for foundation designs, trench excavation, backfill, shoring, and pipe bedding requirements.

Boreholes shall be backfilled with drill cuttings or grout to restore the site.

Environmental and Cultural Resources Surveys

The project area is not known to impact on any wetlands, streams or cultural resources.

Environmental and cultural resources surveys are not anticipated to be necessary.

3D Scanning of Existing Facilities

The existing Pump Building 1 and Pump Building 2 shall be laser scanned to prepare an accurate pre-construction 3-dimensional representation of existing conditions.

A BIM model shall be developed from the point cloud obtained from the scan, which will form the basis for all proposed improvements within these facilities.

Existing as-built documents shall be used to compliment the information obtained from laser scans, and a single BIM model shall be developed that will encompass Building No. 1 and No. 2 (including the existing electrical room) at the Peachtree Pump Station facility.

Structural Evaluation

The project includes work in an existing facility. It is anticipated that some of the work will involve structural repairs. Contractor shall acquire the services of a licensed structural engineer to inspect and assess the integrity of the existing building. Recommendations from the assessment should be made available to the Owner and included within the Contractor’s Scope of Work.

Construction Sequence Plan

The Peachtree Pump Station is a fully operational raw water intake pump station which service two treatment plants. Although brief outages are acceptable (and must be coordinated with the City), the pump station must remain operational during construction activities. The Contractor shall submit a detailed construction sequencing plan for review by the City. At a minimum, the plan shall include construction sequencing, maintaining pumping capacity during structural work, temporary bypass and/or line tapping requirements, transfer of power from existing equipment to new equipment, means to maintain existing seal support system while the new system is installed.

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Alternatives Analysis

The Contractor shall provide an alternatives analysis, evaluating three proposed pumping configurations for Peachtree Raw Water Pump Station and discharge mains.

Alternative 2A

Install new Pumps 1 & 2 to convey raw water from the Peachtree Raw Water Pump Station to the Chattahoochee Water Treatment Plant (CWTP) Tunnel Shaft.

Pumps 1 & 2 will repurpose an existing 42-inch raw water main from the Peachtree Raw Water Pump Station to the Chattahoochee Water Treatment Plant. The Contractor will perform a condition assessment of the 42-inch existing main and implement recommendations to bring it into service.

Install a new line from the 48-inch main to the CWTP Tunnel Shaft.

Alternative 2B

Install new Pumps 1 & 2 to convey raw water from the Peachtree Raw Water Pump Station to the Hemphill Water Treatment Plant Tunnel Shaft.

The existing low service pumps will be increased in capacity to address the needs of the Chattahoochee Water Treatment Plant (including redundancy) and provide excess capacity to convey Raw Water into the CWTP Tunnel Shaft.

The LSP will repurpose an existing 42-inch raw water main from the Peachtree Raw Water Pump Station to the Chattahoochee Water Treatment Plant. The Contractor will perform a condition assessment of the 42-inch existing main and implement recommendations to bring it into service.

Install a new line from the 48-inch main to the CWTP Tunnel Shaft.

Alternative 2C

Install new Pumps 1 & 2 to convey raw water from the Peachtree Raw Water Pump Station to the CWTP Tunnel Shaft. These new pumps shall be connected to a new main, separate from the existing high service pumps Install a new 60-inch main from the Peachtree Raw Water Pump Station to the CWTP Tunnel Shaft. The Contractor shall determine the optimum main route to minimize costs. The area between the Peachtree Raw Water Pump Station and the CWTP Tunnel Shaft is heavily congested with underground utilities, and therefore the optimum routing may be to the north around the facility versus a straight path to the tunnel shaft.

Design Development

Design Drawings

All proposed work shall be modeled in BIM software Autodesk Revit for all applicable disciplines (architectural, structural, process mechanical, HVAC, plumbing, electrical).

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BIM software shall be used by all disciplines to derive sheets for building plans, elevations, and sections from within the Revit files.

Sheets containing diagrams (one-line diagrams, P&IDs, notes, general details, etc.)

shall be developed in Autodesk AutoCAD.

All work by the civil discipline shall be performed in Autodesk Civil 3D.

All drawings shall be prepared on 22-inch by 34-inch ANSI D Full Size format.

Digital drawing files shall be submitted at the completion of design in their native format (AutoCAD, Civil3D, Revit). A unique filename shall be assigned to each Drawing and a consistent file naming format shall be used throughout the Project.

Standard legends and abbreviations sheets shall be prepared containing all symbols and abbreviations used on the Drawings.

Drawings shall include a sequential revision number to allow tracking and shall include the current phase of the design (30%, 60%), and whether the drawings are not-for-construction (draft) or for-construction (final).

All final deliverables shall be signed and sealed.

Any delegated designs shall be clearly identified in the design drawings. The Contractor shall be responsible for coordinating any delegated designs with other engineers as applicable.

Record Drawings

The Contractor shall prepare Record Drawings as part of the Project Record Documents per the requirements in the City’s Guide Specification Section 01720.

In addition, the Contractor shall update the design-phase Revit models during construction with as-built information. At the end of construction, the Contractor shall submit a complete BIM as-built model, and a set of Project Record Drawings reflecting as-built conditions. The Record Drawings shall contain updates from the original design, as well as as-built site surveys, delegated designs (fire protection, digester cover shop drawings), and supplemental information drawings (fire alarm signal drawings), which are important for the record.

Civil Criteria

General Requirements

All potable water, sanitary sewer, stormwater, transportation, and erosion control site civil work shall conform to the City of Atlanta Standard Details for Work in the Public Right-of-Way:

(https://www.atlantaga.gov/home/showdocument?id=57738&t=63807136746 0892339).

Refer to the City of Atlanta Division 2 specifications for applicable site civil work requirements including earthwork, erosion control, piping, manholes, hydrants, asphalt paving, restoration, seeding and sodding, etc.

The Contractor shall follow the guidelines for implementation of erosion control Best Management Practices (BMPs) per the Manual for Erosion and Sediment Control in Georgia, 2016 Edition.

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The Contractor shall adhere to the City of Atlanta’s Post-Development Stormwater Management Ordinance:

(https://www.atlantawatershed.org/stormwaterordinance-2/). The proposed work for this project includes the addition of impervious surfaces. The Contractor shall consider the implementation of green infrastructure where possible to promote stormwater infiltration into the ground and reduce runoff.

The Contractor shall follow the guidelines for design and implementation of stormwater Best Management Practices (BMPs) per the Georgia Stormwater Management Manual, 2016 Edition.

The Contractor shall adhere to the requirements in the City of Atlanta Tree Ordinance for the preservation and protection of trees in the project area (https://www.atlantaga.gov/home/showdocument?id=60907&t=63839352787 2413292).

The Contractor shall be responsible for the verification of existing utilities in the work area; refer to Exhibit G – Special Conditions. The Contractor shall protect all utilities in the work area.’

New Raw Water Mains

The following material options shall be considered by the Contractor in the raw water mains evaluation identified in the Engineering Evaluations under Appendix A – Project Criteria:

Ductile Iron Pipe (DIP) o The design of DIP pipe shall meet the requirements of ANSI/AWWA C150/A21.50 and follow the Design of Ductile Iron Pipe as published by the Ductile Iron Pipe Research Association.

o Type of joint, lining and polyethylene encasement shall be proposed by the Contractor to DWM for review and acceptance.

o American, U.S. Pipe, or approved equal

Welded Steel Pipe (WSP) o The design of WSP Pipe shall meet the requirements of AWWA C200 and follow the Suggested Specification for Buried Steel Water Transmission Pipe as published by the Steel Tank Institute / Steel Plate Fabricators Association.

o Type of joint, and lining shall be proposed by the Contractor to DWM for review and acceptance.

o Thompson Pipe Group S-200 Welded Steel Pipe or approved equal.

Fiberglass Reinforced Polymer (FRP) Mortar Pipe o The design of FRP Pipe shall meet the requirements of AWWA C950 and

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follow AWWA’s M45 Fiberglass Pipe Design.

o Type of joint, and lining shall be proposed by the Contractor to DWM for review and acceptance.

o Hobas FRP, Thompson Pipe Group Flowtite, or approved equal.

Bar-Wrapped Concrete Cylinder Pipe (BCCP) o The design of BCCP shall meet the requirements of AWWA C303 o Thompson Pipe Group C-303, or approved equal

Rehabilitation of Existing Raw Water Mains

The following pipe rehabilitation methods shall be considered by the Contractor in the raw water mains evaluation identified in the Engineering Evaluations under Appendix A – Project Criteria:

Cured-In-Place Pipe Lining (CIPP)

Slip-lining using HDPE or FRP pipe rated for slip-lining installation

Replacement of Existing Yard Valves

The Contractor shall replace the existing 48-inch and 72-inch buried isolations valves on the discharge header.

Architectural Criteria

General Requirements

Code Review: A code review shall be conducted for all building structures within the scope of the project, and the applicable Building Code data shall be identified on the drawings, including occupancy classifications, construction type, allowable height, occupancy separation, etc.

Fire Safety: Identify fire resistance ratings of structural elements, requirements for fire protection systems, and requirements by room within each building. Identify fire resistant construction on the plans, and identify fire suppression system requirements. Provide fire extinguishers as required per Code and per City Specifications.

Means of Egress: Identify the number of exits, path of travel distances, as required per Code for all building structures which are part of this project. Show the path of travel to exits in the Life Safety Plans.

Occupant Load and Accessibility: The existing anaerobic digestion facilities and new building structures proposed in this project are not intended for human

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Energy Conservation: Select materials of construction for the building thermal envelope, insulation, roofing, etc. that comply with commercial provisions of the International Energy Conservation Code.

Electrical: Review light fixture selection, and coordinate layout and compatibility with ceiling system, air diffusers and grilles. Ensure minimum lumen levels meeting Code requirements is provided for all spaces.

Doors and Frames: Adhere to City of Atlanta Division 8 Specifications. Provide insulated personnel and overhead doors. Panic hardware shall be provided on all doors where required by Code. Special door security access control shall be provided where required by the City. Hardware shall be Type 304 stainless steel.

Windows and Glazing: Adhere to DWM Division 8 Specifications. All windows shall have tinted insulated glazing. Use anodized aluminum for window frames.

Surface Finishes: Refer to Protective Coatings Criteria.

Acoustics: Review and confirm whether noise emanating from equipment is within OSHA and NIOSH standards. If exceedances are anticipated provide noise abatement measures to absorb sound and limit sound transmission.

Structural Criteria

General Requirements

Structural Criteria on Plans: Structural design criteria, loading, and applicable codes shall be included in the structural general sheets.

Structural Analysis: Structural design shall be accomplished using structural analysis computer software meeting current industry standards. The output of the software shall be included as part of a structural calculations report to be submitted as part of the design deliverables.

Existing Structures: Loads on existing structures shall be analyzed for proposed conditions to ensure adequacy of existing structures to support new loads. Any structural items requiring demolition, shall be x-rayed to verify rebar locations and embedded conduit.

Design Loads: Calculations shall account for all applicable dead, live, snow, seismic, rain, wind and soil loads on all building structures as allowed by the applicable Code and per ASCE-7. Loads shall include both lateral and vertical loads. Lateral loads are those imposed by wind, seismic forces, soil and liquid pressures, and surcharge loads adjacent to walls. The dead weight of all equipment, piping, walkways, platforms, roofing, shall be incorporated into the wawa curity acurit shall be Typeshall b ivision 8 Specificatioivision 8 Specifi nodized aluminum fonodized aluminum f

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Occupancy Category: All new structures for this project shall be designed to meet the requirements of Occupancy Category III – Water Treatment Facilities.

Groundwater / Flood Stability: Unless otherwise specified, new structures shall be designed to resist forces due to both groundwater and flood conditions. In resisting groundwater or flood loadings, only dead loads shall be considered;

resisting loads shall not include the weights of equipment, piping, or other appurtenances, nor any of the liquid contents of the structure. The minimum groundwater level to be used in uplift calculations for flotation due to groundwater shall be the 100-year flood elevation or as recommended in the geotechnical report to be submitted by the Contractor.

Structural Stability: Design structures to resist sliding, overturning, and flotation using factors of safety as allowed by Code and industry standards.

Foundations: The foundation design shall be based on the recommendations in the geotechnical report to be prepared by the Contractor’s geotech engineer.

A stability safety factor of 1.5 or greater shall be provided for both sliding and overturning; the sliding resistance shall be provided in the geotechnical report.

All foundation subgrades, with the exception of hard shale and solid rock, shall be considered yielding soils. Structures supported on rock, hard shale, piling, or piers shall be designed with a factor of safety against overturning of not less than 2.0. Buoyancy and uplift forces shall be included in calculating the position of the resultant force and the factor of safety against overturning.

Concrete Construction Requirements: The general design of concrete structural members including walls, beams, columns, slabs, footings, etc. shall follow City of Atlanta Division 3 specification requirements, and shall adhere to ACI, ASCE and Code requirements.

Reinforcement: Provide reinforcement for reinforced concrete work per Code requirements, and per the City of Atlanta specifications. Provide temperature reinforcement where required. Reinforcement development lengths and splice lengths shall be in accordance with ACI 318.

Joints: All required construction and control joints shall be indicated on the design drawings and are required for any structure with a dimension of 40 feet or more in any direction. The joint spacing shall also be used to determine the amount of shrinkage and temperature reinforcement required, in accordance with ACI 350, Section 7.12.2. Horizontal spacing of construction and control joints shall generally not exceed 50 feet for non-liquid containing structures and 40 feet for liquid-containing structures. Further guidelines for spacing of joints in liquid-containment structures are listed in ACI 350. Expansion joints shall also be located on the plans where required.

Waterstops: Construction and control joints shall have waterstops where required for liquid-retaining structures. PVC, metal, or adhesive (hydrophilic, DR

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ent:ent: Provide reinfoProvide reiDand per the and per the here reqhere req cccc non-bentonite type) waterstops shall be used in construction and contraction joints, and PVC waterstops will be used in expansion joints. The specifications for waterstops shall be performance based. Waterstops in joints at the bases of walls (and similar applications) shall be specified to assure they remain in their intended position during the construction process. Where more than one type or style of waterstop is specified in a structure, consideration and guidance shall be given regarding how the different waterstops are joined together or overlapped.

Masonry Construction Requirements: The general design of brick and masonry construction shall follow the City of Atlanta Division 4 specification requirements and shall adhere to ACI-530 and Code requirements.

Metals Fabrications: The general design of aluminum and steel metal fabrications including roof decks, stairs, grating, railings, etc. shall follow the City of Atlanta Division 5 specification requirements.

FRP Fabrications: Gratings, railings and other fabrications located in process areas exposed to corrosive environments shall be fiber reinforced polymer (FRP).

Deflections: Design for deflections in new structures as allowed by Code.

Testing Water Tightness of Concrete Structures: All new concrete structures designed to contain liquids shall be tested for water tightness by the Contractor in accordance with ACI 350. The test criterion shall be HST-NML (no measurable loss) as defined by ACI.

Roof Condition Assessment: Contractor shall include an assessment of the roof for potential leaks, and propose a method to mitigate the leaks.

Bridge Crane: Contractor shall obtain the services of a bridge crane inspector to assess the condition of the bridge crane, and make recommendations for rehabilitation if necessary.

Control Room: Contractor shall identify structural modifications necessary to incorporate the new VFDs into the existing electrical/control room.

Process Mechanical Criteria

General Requirements

The design of process equipment, pumps, valves, and piping for this project shall conform to the guidelines in:

o Minimum Standards for Public Water Systems, Georgia EPD o Recommended Standards for Water Works, 2012 Edition o Hydraulic Institute (HI) Standards.

The City of Atlanta Standard Specifications contains requirements for some types of equipment, pumps, valves, and piping. The City’s Standard Specifications shall govern the selection and installation of said components. The Contractor shall be

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Where the criteria identified below conflicts with the City’s specifications, the Contractor shall request clarification from the City.

The design criteria identified below is not intended to cover all components necessary for this project. It is the responsibility of the Contractor to identify and develop the design criteria for all systems and sub-systems required to achieve a complete working digestion and gas management system for the scope agreed with the City in the Phase 1 Services.

Provide physical equipment and valve tags matching the tags in the design drawings.

New Pumps 1, 2 and 9

The preferred type of pump for New Pumps 1 and 2 is a vertical turbine. The size and type of pump for pumps 1 and 2 shall be selected by the Contractor based on existing site constraints and operational criteria, meeting HI standards.

Design the mounting of the proposed pump to the structure.

Any modifications to the existing structure which are proposed by the Contractor for the purpose of pump installation shall be accompanied by a complete structural analysis and evaluation to check and protect the integrity of the remaining structure.

Pump 9 shall be a vertical turbine pump with the discharge head centerline elevation at 768.70’, and the floor elevation where the motor is mounted at 778.70’.

Perform a complete lateral and torsional rotordynamic analysis of the new pumps and motors to ensure vibrations are within allowable limits per HI.

Pump Refurbishment

Remove, disassemble, inspect and replace worn parts, balance, reassemble and perform a functional test.

Pump Minimum Refurbishment – Inspect pump bowls, shaft and enclosing tube for any unusual signs of damage, blast and recoat all painted metallic parts, replace wear rings, bearings, seals and gaskets. Perform dynamic balancing of the rotating assembly. Replace all instruments and sensors attached to the pump.

Pump Additional Refurbishment – Replace shaft if cracks are detected by ultrasonic inspection.

Low Service Pump Elective Refurbishment – If it is necessary to increase the low service pumping capacity, replace bowl assemblies in Pumps 4, 8 and 9 to increase flow capacity and optimize the use of non-overloading excess horsepower. If a bowl assembly replacement is anticipated, the parts can be obtained before the pump is removed. Elective refurbishment is not cost effective for Pump 3 because a larger impeller cannot be installed without overloading the motor horsepower. It would be cost effective to replace the complete pump and motor assembly for Pump 3.

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High Service Pump Elective Refurbishment - If it is necessary, based on the alternatives analysis, to offset the reduced capacity of Pumps No. 1 and 2, bowl assemblies in Pumps No. 5, 6 and 7 can be replaced to increase capacity from 41 MGD to 44 MGD without exceeding the rated motor horsepower. Because of the advantages of operating and maintaining 5 identical high service pumps, however, optimizing impeller diameter for Pumps No. 5, 6 and 7 is not recommended.

Motor Refurbishment

Renewal and reconditioning of an existing electric motor including bearing replacement, cleaning, reinsulation, and shaft repair.

Before reconditioning, motor shall be inspected, and an inspection report prepared which identifies observations of existing motor condition.

Motor rewinding may be required depending on inspection.

Testing of reconditioned motor shall be performed in accordance with NETA and IEEE standards.

Pump Control Valve Refurbishment

Remove, disassemble, replace worn parts, reassemble, hydrotest and perform a functional test.

Inspect valve body for any unusual signs of damage, blast and recoat, replace seals, bearings, bushings, all corroded bolts, nuts, and washers Repair any surfaces that are worn due to cavitation before final coating Actuator refurbishment: none; actuators will not be reused.

New Pump Control Valves

AWWA metal-seated ball valve

New Pump Control Valve Actuators

Electro-hydraulic type, with the electric actuator as the primary operating method and a hydraulic actuator as a secondary method.

Self-contained power unit for fail safe operation Mechanical spring-return and accumulators for multiple backup strokes Rotork Skilmatic SI; Rexa XPAC; or approved equal.

The valves shall utilize a common hydraulic system, one for the high service pumps and a separate hydraulic system for the low service pumps. The system shall include a cross over connection if one system is out of service, all control valve can still be operated.

Pump Discharge Piping

Flanged Ductile Iron Pipe (DIP) meeting the requirements of ANSI/AWWA C115/A21.15, C151/A21.51 with minimum pressure rating of 200 psi.

Cement-lined in accordance with ANSI/AWWA C104/A21.4.

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In compliance with ANSI/NSF 61.

Replace the existing discharge piping isolation butterfly valves, check valves and dismantling joints with new units.

New Traveling Screens at Pump Building 1

Traveling screen for raw river water service Automatic differential controls to protects against high debris loading Floor elevation of top platform: 790.70’ Approximate wet-well floor elevation at screen location: 731.20’ Width of structural opening: 7’-2” Atlas-SSI Thru-Flow water screen or equal Install new slide gates and actuators

Rebuild of Traveling Screens at Pump Building 2

Rebuild/Refurbishment of Traveling Screens is by Others Install new slide gates and actuators

General Pump Selection Criteria

Pumps shall be selected and sequenced, so they normally operate within their Preferred Operating Region in accordance with the Hydraulic Institute Pump Standards, latest edition.

Pump NPSH margins shall be based on suction energy level and application as recommended in the Hydraulic Institute Pump Standards, latest edition.

Rotational equipment vibrations shall meet Hydraulic Institute requirements.

Provide clean water for seal flushing where required by the pump manufacturer.

Piping Expansion and Flexibility

In addition to fulfilling the requirements of the construction contract, the Contractor shall be responsible for locating and sizing pipe anchors. Anchors shall resist hydraulic thrust and thermal forces and direct and control thermal expansion. Anchors shall be shown and detailed on the drawings.

Double joints shall be provided where pipes enter concrete or otherwise rigid structures to account for differential settling. The first joint shall be located within 2 feet of the structure and the second joint within 5 feet of the first joint, as a minimum requirement.

Minimum hydraulic thrust requirements shall be computed in accordance with the Handbook of Ductile Iron Pipe, latest edition.

Pressure Reducing Valve

Contractor to investigate the replacement of the PRV that connects the HSP

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Sump Pumps

Replacement of sump pump, piping and valves associated with Building No. 1.

Surge Tank System

Refurbishment of the surge tank system (including tank, compressor, valves, controls) to ensure a fully operational system.

HVAC Criteria

General

All HVAC systems shall be designed in accordance with the current Codes and City Standards. Refer to the City of Atlanta Division 15 specifications for applicable HVAC work requirements.

The HVAC systems shall perform the following functions:

o Maintain the concentration of combustible and hazardous gases below limits required by NFPA 820 and as required for operator safety by applicable codes and standards.

o Process incoming outside air by filtering as required by ASHRAE Standard 62.1-2013.

o Provide uninterruptible operation of ventilation systems where continuous ventilation is required by NFPA 820 through alternate power supply and adequate redundant systems.

o Protect equipment and piping from overheating or freezing.

o Provide uninterruptible operation of cooling equipment for electrical rooms through adequate redundant systems.

o Provide combustion air for gas-fired equipment in accordance with Code and standards.

o Maintain positive or neutral pressurization in spaces containing gas-fired equipment.

All new systems shall be designed in accordance with the current Codes.

Systems shall be designed to ensure adequate, convenient maintenance access to equipment. Equipment shall be selected to minimize required maintenance.

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Calculations shall follow the methodology outlined in the applicable energy codes, ASHRAE Handbook of Fundamentals, and referenced ASHRAE handbooks and publications.

Supply and exhaust ventilation rates shall be calculated for all applicable criteria, and the highest ventilation rate shall be used for design.

As part of the design, the following items shall be evaluated:

o Ventilation rates versus electrical area classification per NFPA Standard 820 for applicable spaces.

o Degree of interface between HVAC controls and main plant control system.

o Degree of interface between the building heating water system and the digester heating water system.

In areas where other criteria do not require a higher ventilation rate, the selected ventilation rate shall be based on an evaluation of the potential occupancy of the space.

Plumbing Criteria

General

All plumbing systems shall be designed in accordance with the current Codes and City Standards. Refer to the City of Atlanta Division 15 specifications for applicable plumbing work requirements.

The plumbing system shall perform the following functions:

o Provide sewer and potable water service for non-process sanitary fixtures.

o Provide potable tempered water services for emergency shower and eyewash fixtures where required.

o Provide backflow prevention devices and downstream water services for process seal water, and other needs such as boiler makeup water, and area washdown.

Plumbing calculations must follow the methodology outlined in the applicable Codes.

Water heaters shall be sized in accordance with the guidelines recommended by the American Society of Plumbing Engineers (ASPE).

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Electrical Criteria

General

City Standards: Refer to the City of Atlanta Division 16 specifications for applicable electrical work requirements including short-circuit & coordination studies, raceways, conductors, electric motors, low voltage MCCs, low voltage switchgear, disconnect switches, VFDs, substations, etc.

Power Distribution System Planning: The design of the power distribution system will follow current design guidelines as recognized by IEEE and current industry standards. Georgia Power currently provides power to the RM Clayton WRC complex, of which the Peachtree Raw Water Pump Station is a part.

RM Clayton WRC: The main service distribution switchgear at RM Clayton WRC is located near the Georgia Power Substation next to the Peachtree Raw Water Pump Station. The feeders from Georgia power are connected to Switchgear A which sub-feeds electrical gear in Pump Building 1; and to Switchgear B which sub-feeds electrical gear in Pump Building 2.

Distribution/Utilization Voltages: The following distribution and equipment utilization voltages and ratings shall generally be used. Depending on the specific equipment requirements determined in design, there may be exceptions to the following numbers:

o Motors above 500 hp 4160 volts, three-phase o Motors, 1/2 to 500 hp 480 volts, three-phase o Motors, less than 1/2 hp 120 volts, single-phase o Lighting 120 volts, single-phase o Convenience Outlets 120 volts, single-phase

Load Analysis: Perform an electrical load analysis as part of the Phase 1 Engineering Evaluation to confirm the rating required for new panelboards, MCCs and switchgears.

Short Circuit/Voltage Drop Analysis: For purposes of design, short-circuit levels and steady state voltage drops will be calculated using a computer-based program. Short-circuit values obtained will be used to specify the appropriate short-circuit ratings for electrical equipment. Design will generally be such that voltage drops will not exceed three percent for branch voltages and five percent for bus voltages under steady-state conditions.

Power Monitoring: All new electrical distribution equipment installed will be specified to include power monitoring. The power metering package shall be capable of RS 485 serial and Ethernet communication for remote monitoring via a centralized and dedicated power monitoring computer workstation. The digital power meters shall be manufactured by Allen-Bradley “Power Monitor 3000”, Cutler-Hammer "Power Xpert", Multilin “PQM”, or Square D “PowerLogic

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Electrical and Control Rooms Purification: Make up air to electrical and control rooms shall be scrubbed and supplied through a corrosive gas filtering system.

Ventilation monitoring shall be provided for process areas where required by NFPA 820 Fire Protection for Wastewater Facilities when reducing hazardous areas to non-hazardous areas through the use of ventilation.

Telephone, Security, Video: The new facilities are not anticipated needing to be equipped with telephone and video systems. COA security requirements will be followed.

Short Circuit and Coordination Study: A short-circuit, coordination arc-flash study will be performed by the Contractor’s designee for the entire portion of the power distribution system associated with this project. The report will show the complete line up of overcurrent protection. A single line diagram covering all existing and new equipment associated with this project, along with corresponding short circuit data will be required. The report will also show a tabulation of protective devices and their settings. An Arc-Flash Study with protective labels will also be provided for all equipment installed under this project in accordance with OSHA 29 CFR Part 1910, NEC, NFPA 70E, and IEEE 1584. The Arc Flash Hazard Analysis calculations shall enable identification and selection of a level of Personal Protective Equipment (PPE). Results of the Arc Flash Hazard Analysis shall identify the flash-protection boundary and the incident energy at assigned working distances throughout any position or level in the overall electrical generation, transmission, distribution, or utilization system.

Low Voltage MCCs: Arc-resistant, rated for 600V, with tin-plated busses, and 65,000 KAIC minimum. The MCCs shall be indoor type with NEMA 1A gasketed enclosure. Each starter shall be provided with its own control power transformer.

All contactors shall be NEMA-rated.

Grounding: A complete grounding system will be provided for new buildings which are part of this project, and will consist of service and equipment grounding per NEC requirements, and will include ground rods and will be bonded to steel structures to create a common ground. Down conductors from the lightning protection systems will be bonded to the grounding system at each building in accordance with NEC and NFPA 780 requirements. Electrical equipment such as switchgear, panelboards, transformers, and motors will be grounded using the equipment grounding conductors associated with the supply feeders as required by NEC. All transformer secondary neutrals on 120/208 V and 277/480 V systems will be grounded.

Lightning Protection System: A lightning protection system will be provided for the new and existing buildings which are part of this project, where applicable by C. The system will be designed and installed in accordance with LPI 175 and 176, UL 96 and 96A and NFPA 780.

Lighting: The new building will be provided with new energy-efficient LED

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Disconnect Switches: Disconnect switches shall be single-throw, 480V, 3PH, 3-pole, UL-listed, heavy duty, non-fusible unless fused is needed to meet short-circuit ratings.

Variable Frequency Drives

Provide new 4160V VFD for pump 1 and new RVSS for pump 2 in the Control Building.

Provide new 4160V VFD for low service pumps 4 and 9. Remaining low service pumps shall be provided with a RVSS

Medium Voltage Switchgears

Provide new 4160V metal-clad switchgear arranged in main-tie-tie-main for pumps 1 and 2 in the Control Building.

Contractor shall perform a condition assessment of the existing transformers to determine if they are suitable for the service.

Low Voltage MCCs

Provide new 480V MCC for ventilation and other building loads at Pump Building 1.

Provide new 480V MCC for pump #3, ventilation and other building loads at Pump Building 2.

Instrumentation & Control Criteria

General

The existing Plant Monitoring and Control System (PMCS) at the Peachtree Raw Water Pump Station consists of a Foxboro IA (DCS) using redundant Ethernet networks communicating to Foxboro IA Field Process Controllers and Foxboro I/O. Foxboro I/O is connected to existing equipment systems and instrumentation in each process area providing both remote monitoring and control of the connected equipment and process systems. Vendor furnished packaged control systems controlled via individual vendor-furnished PLCs operate either as ‘stand-alone’ systems or are connected via Ethernet communication gateways into the Foxboro IA DCS.

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Per the City’s preferences, all replacement equipment systems and new packaged control systems are to utilize Rockwell Automation ControlLogix PLCs and communicate via Foxboro IA gateways with the existing DCS system. Each PLC system will utilize a panel mounted local operator interface terminal (OIT) for local PMCS network override monitoring and control in place of switches, lights, and annunciators. Each OIT shall be an industrialized (rated NEMA 4X with a minimum 17” LCD display) personal computer enabling the display system software to operate ‘Schneider Wonderware InTouch’ as the OIT interface. A variant of Wonderware is the HMI (Human Machine Interface) software deployed on the current production version of Foxboro IA (EVO), allowing the OIT interface to match the ‘look and feel’ of the Foxboro IA EVO HMI software.

All PLC networks and communication protocols shall utilize Ethernet (Ethernet/IP) for interfacing to the Foxboro IA DCS via additional Foxboro I/A FBM modules. Use of PLC manufacturer’s proprietary protocols (non-Ethernet based) for communications between PLCs and OIUs is not acceptable.

Provide operations reporting functions including data warehousing, data archiving, relational database management, manual data entry and processing, data verification and validation, and report design, scheduling, and processing. Coordinate with the City to acquire database structure and tag naming convention.

Coordinate with the City regarding…