SOW_EM_Solar_Inverter_Replacement_26.05.04.pdf

Regional Transportation District Denver, CO

Technical Scope of Work

East Metro – Solar Inverter Replacement - 2026

Version: 1 May 4, 2026

East Metro – Solar Inverter Replacement - 2026 2

A. Scope of Work

The Regional Transportation District is seeking qualified solar energy suppliers and installers to submit proposals for design, supply and installing (4) solar inverters that are currently out of service on the roof of the East Metro Bus Facility at 14100 E. Colfax Ave. Aurora, CO 80011.

1. Attached to this document are the design drawings (Exhibit A) for the original photovoltaic system currently installed on the roof.

2. Attached to this document are the photos (Exhibit B) for the original photovoltaic system currently installed on the roof.

B. Project Background

The existing photovoltaic system on the roof comprises of total 22 roof top solar inverters.

Inverters are at the end of their useful life, non-existent and non-repairable. It is critical that these (4) inverters are installed at this time and repowered to ensure reliable generation of electricity from a fully functional solar panel system. AC and DC Wiring has been disconnected from the inverters and left in place. Refer to Exhibit B for additional information.

C. Scope of Work

1. Provide design, supply and installation of new solar inverters compatible with existing photovoltaic system.

a. The design shall be carried out by a licensed engineer with extensive experience of designing photovoltaic systems. Upon request, provide RTD with engineer's qualification data.

b. Review of existing site conditions and the design drawings for current 499.1 kW installation.

c. Design for a new solar inverter system to be compatible with existing photovoltaic system. This shall include but not limited to roof plans, inverter product data sheets, calculations, updates to the existing single line diagrams, city approved drawings and installation details.

d. The entire inverter system shall be evaluated and designed for replacement at a later date but only (4) inverters [INV-9E/10E/11E AND INV-10W] shall be procured and installed at this time with any associated materials and labor.

e. Assessment and verification of all existing AC, DC, communication, and grounding wiring to confirm compliance and determine potential reuse with the new inverter systems, except where replacement is required.

f. Supply and install new, fully operational, turnkey inverter system including commissioning and startup.

g. The engineer shall supply to RTD stamped drawings, detailing each and every component of the project.

h. The engineer shall provide project specific specifications suitable for construction, addressing each and every component of the project.

East Metro – Solar Inverter Replacement - 2026 3

i. Engineering shall adhere to all applicable industry standards and regulations.

j. The design will be based on existing constructed photovoltaic system, meeting electrical code compliance and the engineer's observation and experience.

k. All necessary plan reviews and permits shall be obtained from the authority having jurisdiction.

l. The system shall be installed on the roof in a manner so as not to hinder daily RTD maintenance activities, provide the most efficient use of space, and minimize impacts to existing installation.

m. The inverter system shall meet latest technologies and features required to meet current electrical codes.

n. All work shall be tested, inspected and commissioned for a fully functional system.

o. In addition to items noted above, pricing shall be provided for each additional inverter as a separate line item. Ther inverters shall be [INV-1W, 2W, 8W, 1E AND

INV-2E]. Refer to Exhibit B for more information. All scope items above shall apply as deemed necessary.

2. Give any necessary notices, pay all charges, fees and taxes; and obtain all necessary permits to properly carry out the scope of work. The contractor shall be responsible for determining what notifications and/or permits are required.

3. Contractor shall field verify locations for all existing utilities required for connection of the new inverter system. Contractor shall submit shop drawings prepared by the engineer showing layout of the new system.

4. The proposed system must be approved through the submittal process by RTD representative prior to proceeding with work.

a. Submittals required for;

i. Shop drawings

ii. Product data for each piece of equipment and any materials used on the project.

iii. Construction schedule

iv. Field test reports

b. RTD reserves the right to reject any equipment or materials that are installed without prior approval by RTD through the submittal process. Any rejected equipment or materials shall be removed and replaced with an approved component at the contractor's expense.

5. The contractor shall supply and install the new inverter system as per their engineers design. The contractor will supply and install any and all components necessary for a complete and functional system. This includes, but is not limited to;

a. Construction supervision

b. Demolition,

c. Furnishing and installing materials

d. All labor

e. All tools and equipment

f. All necessary electrical modifications and wiring

East Metro – Solar Inverter Replacement - 2026 4

g. All mechanical work

h. Any and all incidentals

6. Participate in project progress meeting, supply and update construction schedule, as deemed necessary by RTD personnel.

7. Perform all painting and patching in areas disturbed by work, areas shall be restored to their original condition. Any roof penetrations shall be patched by a roofing contractor certified by the roofing manufacturer.

8. Supply operations and maintenance manuals to be supplied at substantial completion.

9. Produce and supply as built drawings.

10. Demonstration and training to be scheduled to coincide with substantial completion.

D. Building Details

Included are a set of drawing (Exhibit A) that includes current photovoltaic system installation on the roof.

1. (Roof structural details are not available).

E. RTD Site Requirements

1. Code Compliance: The firm shall comply with all applicable codes, ordinances, standards, and statutes, which are or will be in effect during the term of this project and are under the jurisdiction authority of the City of Aurora. Authorities include the public works departments, fire prevention bureaus, the State of Colorado, Americans with Disabilities Act (ADA), Environmental Protection Agency (EPA), Occupational Safety and Health Administration

(OSHA), and any other local, state, or federal agencies that may impact project development or operations. The firm shall also comply with any requirements of RTD’s insurance carrier, utility companies, and Xcel energy.

2. RTD personnel will occupy the site and building during the entire construction period. The contractor must cooperate with RTD personnel during construction operations to minimize conflicts with the day-to-day operations.

3. Maintain access to existing walkways, corridors, and other adjacent occupied or used facilities. Do not close or obstruct walkways, corridors, or other occupied or used facilities without written permission from Owner and approval of authorities having jurisdiction.

4. Notify the Owner not less than 3 days in advance of activities that will affect Owner's operations.

5. The Contractor shall comply with RTD safety and environmental policies; the RTD Project

Manager or Environmental Compliance Officer will have the authority to stop Contractor work

East Metro – Solar Inverter Replacement - 2026 5

(at the Contractor’s expense) if the work is deemed to be in violation of regulatory requirements, RTD’s policies, or presents a safety hazard.

6. RTD EXTENDED TERMS AND CONDITIONS

1. On-Site Work Hours: Limit work in the existing building to normal business working hours Monday through Friday, unless approved by project manager.

2. Notify owner not less than 3 (three) days in advance of proposed utility interruptions.

3. Nonsmoking Building: Smoking is not permitted within the building or within 25 feet of entrances, operable windows, or outdoor air intakes.

4. RTD drug and alcohol policy – drugs and alcohols are strictly prohibited from all of

RTD properties. Any contractor or contractor’s employee’s caught with drugs of alcohol will immediately be escorted off of RTD property.

5. Signage and Barricades - Contractor shall be responsible for installing and maintaining all necessary and appropriate signage and barricades to insure a safe work environment in accordance with all local building codes and OSHA regulations.

6. Equipment - The contractor and all subcontractors are responsible for furnishing all equipment such as forklifts, man lifts, backhoes, ladders, carts, etc. To complete all work as specified under this contract, RTD equipment will not be made available for use under this contract. RTD is not responsible for the contractor’s tools and equipment. Lifts used by contractors shall be equipped with flashing lights and beepers to indicate horizontal or vertical movement.

7. Contractor vehicles – All contractor vehicles are to be parked in pre-approved designated areas only. Only vehicles that are necessary to complete the project shall be allowed on the site. Vehicles parked outside of designated areas will be subject to removal at the expense of the vehicle owner.

8. Emergency phone numbers - Phone numbers for contractor representatives for off-hour communication shall be made available to the RTD project team and posted at the construction site at the time of the preconstruction meeting. These phone numbers will allow RTD to contact the contractor concerning emergency situations with contract work. These phone numbers shall include home phones mobile phones and pager numbers. The contractor will be responsible for responding to any emergency request within a 45 minute time period. If the contractor is non-responsive, back charges will be administered.

9. Waste – All hazardous waste and or spills, all industrial waste, and all contaminated waste resulting from the contractors work as well as non-hazardous construction debris are the sole responsibility of the contractor for cleaning and removal from the site. On site dumpsters are for the sole use of RTD. Contractors are to supply theirs at a location on the site pre-approved by RTD, or remove their construction debris from the site on a daily basis.

East Metro – Solar Inverter Replacement - 2026 6

10. Storage containers – All containers that are used during the project containing solids or fluids shall be labeled in accordance with OSHA and NFTA standards. Containers holding fluids need to have compatibility labels.

11. Daily Cleaning - Contractor shall be required to clean up all areas under construction at the end of the day to prevent dust and dirt contamination within the building and on the buses. All areas are to be swept daily, concrete slurry from saw cuts is to be contained and cleaned up immediately after cutting. Slurry must be removed from site.

12. Dust control - the contractor is to minimize and contain air born dust from demolition activities. The contractor shall use water, exhaust fans and/or tenting to keep dust from migrating into adjacent areas within the facility and affection RTD personal and equipment. The contractor will be liable for cleanup costs or to replace equipment damaged by dust migration.

13. Protection of RTD property – The contractor shall use care and caution when working around RTD vehicles, equipment and RTD mechanics tools and toolboxes.

The contractor shall be responsible for protecting, clean, and or replace RTD and RTD employee’s property damaged as a result of construction activities.

14. RTD will provide restroom facilities as needed, providing they are kept clean by the contractor’s personnel.

15. Identification Badges - All Contractor employees are required to wear an RTD contractor ID badge at all times when on RTD property. The ID badge will be provided by RTD before the contractor mobilizes and will be in effect for the duration of the contract. Any persons on RTD property without an ID badge will be instructed to vacate the property immediately. If the ID badge is not returned at the end of the project, the contractor will be assessed a $25 fee per badge.\

16. RTD final project walk through – The project shall be fully completed and the job site cleaned prior to scheduling the final walk through.

F. Submittal Procedures

PART 1 – PRODUCTS

1. Section includes requirements for the submittal schedule and administrative and procedural requirements for submitting Shop Drawings, Product Data, Samples, and other submittals.

2. Action submittals: Written and graphic information and physical samples that require owner’s responsive action.

East Metro – Solar Inverter Replacement - 2026 7

3. Informational submittals: Written and graphic information and physical samples that do not require owner’s responsive action. Submittals may be rejected for not complying with requirements.

4. Processing time: Allow time for submittal review, including time for resubmittal, as follows. Time for review shall commence on construction managers receipt of submittal.

No extension of the Contract Time will be authorized because of failure to transmit submittals enough in advance of the Work to permit processing, including resubmittal.

a. Initial Review: Allow 15 days for initial review of each submittal. Allow additional time if coordination with subsequent submittals is required. Project manager will advise Contractor when a submittal being processed must be delayed for coordination.

b. Resubmittal Review: Allow 15 days for review of each resubmittal.

5. Electronic submittals:

a. Assemble each submittal individually and appropriately for transmittal and handling.

b. Transmit each submittal using a transmittal form.

c. Construction manager will return without review submittals received from sources other than Contractor.

d. Place a permanent label or title block on each submittal item for identification.

e. Provide space approximately 6" x 8" on label or beside title block to record review and approval markings and action taken by Project manager

f. Include all information as deemed necessary for processing and recording action taken, including.

i. Project name, Date, Name of Contractor, Name of subcontractor, Name of supplier, Name of manufacturer, Submittal number or other unique identifier, including revision identifier.

6. Resubmittal: Make resubmittal in same form and number of copies as initial submittal.

a. Note date and content of previous submittal.

b. Note date and content of revision in label or title block and clearly indicate extent of revision.

c. Resubmit submittals until they are marked with approval notation from construction manager's action stamp.

7. Distribution: Furnish copies of final submittals to manufacturers, subcontractors, suppliers, fabricators, and installers, authorities having jurisdiction, and others as necessary for performance of construction activities. Show distribution on transmittal forms.

8. Use for construction: Retain complete copies of submittals on Project site. Use only final action submittals that are marked with approval notation from construction managers action stamp.

PART 2 - SUBMITTAL PROCEDURES

1. General submittal procedure requirements:

East Metro – Solar Inverter Replacement - 2026 8

a. Submit electronic submittals via email as PDF electronic files. Construction manager will return annotated file. Annotate and retain one copy of file as an electronic Project record document file. Provide a digital signature with digital certificate on electronically submitted certificates and certifications where indicated.

2. Certificates and Certifications Submittals: Provide a statement that includes signature of entity responsible for preparing certification. Certificates and certifications shall be signed by an officer or other individual authorized to sign documents on behalf of that entity.

PART 3 - ACTION SUBMITTALS

1. Product data: Collect information into a single submittal for each element of construction and type of product or equipment.

a. If information must be specially prepared for submittal because standard published data are not suitable for use, submit as Shop Drawings, not as Product Data.

b. Mark each copy of each submittal to show which products and options are applicable.

c. Include the following information, as applicable:

i. Manufacturer's catalog cuts.

ii. Manufacturer's product specifications.

iii. Standard color charts.

iv. Statement of compliance with specified referenced standards.

v. Testing by recognized testing agency.

vi. Application of testing agency labels and seals.

vii. Notation of coordination requirements.

viii. Availability and delivery time information.

ix. Wiring diagrams showing factory-installed wiring.

x. Operational range diagrams.

xi. Clearances are required to other construction, if not indicated on accompanying Shop Drawings.

xii. Submit Product Data before or concurrent with samples.

2. Shop drawings: Prepare Project-specific information, drawn accurately to scale. Do not base Shop Drawings on reproductions of the Contract Documents or standard printed data.

a. Preparation: Fully illustrate requirements in the Contract Documents. Include the following information, as applicable:

i. Identification of products.

ii. Schedules.

iii. Compliance with specified standards.

iv. Notation of coordination requirements.

v. Notation of dimensions established by field measurement.

vi. Relationship and attachment to adjoining construction are clearly indicated.

vii. Seal and signature of professional engineer if specified.

East Metro – Solar Inverter Replacement - 2026 9

b. Shop drawing may be submitted in paper or electronic format.

3. Information submittals

a. Contractor's Construction Schedule:

b. Closeout Submittals:

c. Qualification Data: Prepare written information that demonstrates capabilities and experience of firm or person. Include lists of completed projects with project names and addresses, contact information of architects and owners, and other information specified.

i. Installer Certificates: Submit written statements on manufacturer's letterhead certifying that the installer is authorized by manufacturer for this specific Project.

d. Product Certificates: Submit written statements on manufacturer's letterhead certifying that product complies with requirements in the Contract Documents.

e. Field Test Reports: Submit written reports indicating and interpreting results of field tests performed, for compliance with requirements in the Contract Documents.

f. Design Data: Prepare and submit written and graphic information, including, but not limited to, performance and design criteria, list of applicable codes and regulations, and calculations. Include list of assumptions and other performance and design criteria and a summary of loads. Include load diagrams if applicable.

Provide name and version of software, if any, used for calculations.

4. Delegated design services

a. Performance and Design Criteria: Where professional design services or certifications by a design professional are specifically required of Contractor by the Contract Documents, provide products and systems complying with specific performance and design criteria indicated.

i. If criteria indicated are not sufficient to perform services or certification required, submit a written request for additional information to construction manager.

b. Delegated-Design Services Certification: In addition to Shop Drawings, Product Data, and other required submittals, submit three (3) paper copies of certificate, signed and sealed by the responsible design professional, for each product and system specifically assigned to Contractor to be designed or certified by a design professional.

G. Operations and Maintenance Manuals

PART 1 - OPERATION MANUALS

1. Content:

a. System, subsystem, and equipment descriptions. Use designations for systems and equipment indicated on Contract Documents.

b. Performance and design criteria if Contractor has delegated design responsibility.

c. Operating standards.

d. Operating procedures.

e. Operating logs.

f. Wiring diagrams.

East Metro – Solar Inverter Replacement - 2026 10

g. Control diagrams.

h. Precautions against improper use.

i. License requirements including inspection and renewal dates.

2. Descriptions: Include the following:

a. Product name and model number.

b. Manufacturer's name.

c. Equipment identification with serial number of each component.

d. Equipment function.

e. Operating characteristics.

f. Limiting conditions.

g. Performance curves.

h. Complete nomenclature and number of replacement parts.

3. Operating Procedures: Include the following, as applicable:

a. Startup procedures.

b. Equipment or system break-in procedures.

c. Routine and normal operating instructions.

d. Regulation and control procedures.

e. Normal shutdown instructions.

f. Seasonal and weekend operating instructions.

g. Required sequences for electric or electronic systems.

h. Special operating instructions and procedures.

PART 2 - MAINTENANCE MANUALS

1. Content: For each system, subsystem, and piece of equipment, include;

a. Source Information: List each system, subsystem, and piece of equipment included in manual identified by product name and arranged to match manual's table of contents. For each product, list name, address, and telephone number of installer or supplier and maintenance service agent.

i. Product Information: Include the following, as applicable:

1. Product name and model number.

2. Manufacturer's name.

3. Color, pattern, and texture.

4. Material and chemical composition.

5. Reordering information for specially manufactured products.

b. Manufacturers' Maintenance Documentation: Manufacturers' maintenance documentation including the following information for each component part or piece of equipment:

i. Standard maintenance instructions and bulletins.

ii. Drawings, diagrams, and instructions required for maintenance, including disassembly and component removal, replacement, and assembly.

iii. Identification and nomenclature of parts and components.

iv. List of items recommended to be stocked as spare parts.

c. Maintenance Procedures: Include the following information and items that detail essential maintenance procedures:

i. Test and inspection instructions.

ii. Troubleshooting guide.

East Metro – Solar Inverter Replacement - 2026 11

iii. Precautions against improper maintenance.

iv. Disassembly; component removal, repair, and replacement; and reassembly instructions.

v. Aligning, adjusting, and checking instructions.

vi. Scheduled Maintenance and Service: Tabulate actions for daily, weekly, monthly, quarterly, semiannual, and annual frequencies.

vii. Maintenance and Service Record: Include manufacturers' forms for recording maintenance.

d. Spare Parts List and Source Information: Include lists of replacement and repair parts, with parts identified, and cross-referenced to manufacturers' maintenance documentation and local sources of maintenance materials and related services.

e. Maintenance Service Contracts: Include copies of maintenance agreements with name and telephone number of service agent.

f. Warranties and Bonds: Include copies of warranties and bonds and lists of circumstances and conditions that would affect validity of warranties or bonds.

i. Include procedures to follow and required notifications for warranty claims.

H. Demonstration and training

a. Develop an instruction program that includes individual training modules for each system and piece of equipment, to include.

i. Basis of System Design, Operational Requirements, and Criteria: Include the following:

1. System, subsystem, and equipment descriptions.

2. Performance and design criteria responsibility.

3. Operating standards.

4. Regulatory requirements.

5. Equipment function.

6. Operating characteristics.

7. Limiting conditions.

8. Performance curves.

ii. Documentation: Review the following items in detail:

1. Operations manuals.

2. Maintenance manuals.

3. Project record documents.

4. Identification systems.

5. Warranties and bonds.

iii. Operations: Include the following, as applicable:

1. Startup procedures.

2. Equipment or system break-in procedures.

3. Routine and normal operating instructions.

4. Regulation and control procedures.

5. Control sequences.

6. Safety procedures.

7. Normal shutdown instructions.

8. Operating procedures for emergencies.

9. Operating procedures for system, subsystem, or equipment failure.

East Metro – Solar Inverter Replacement - 2026 12

10. Seasonal operating instructions.

11. Required sequences for electric or electronic systems.

12. Special operating instructions and procedures.

iv. Troubleshooting: Include the following:

1. Diagnostic instructions.

2. Test and inspection procedures.

v. Maintenance: Include the following:

1. Inspection procedures.

2. Types of cleaning agents to be used and methods of cleaning.

3. List of cleaning agents and methods of cleaning detrimental to product.

4. Procedures for preventive maintenance.

5. Procedures for routine maintenance.

6. Instruction on use of special tools.

vi. Repairs: Include the following:

1. Diagnosis instructions.

2. Repair instructions.

3. Disassembly; component removal, repair, and replacement; and reassembly instructions.

4. Instructions for identifying parts and components.

5. Review of spare parts needed for operation and maintenance