2026-0508 Addendum 1 Plainwell Generator.pdf

f:\projects\mis032.13\pm\issued for\2026-0508 addendum 1\2026-0508 addendum 1 plainwell generator.docx

May 8, 2026

ADDENDUM NO. 1

Century A&E Project No. MIS041

RE: File Number 591/25413.JLM MDOT Grand Region Plainwell – Generator

BID DUE DATE IS UNCHANGED: MAY 13, 2026, AT 2:00 PM ET

This Addendum forms a part of the Contract Documents and modifies the original Bidding Documents drawings and specifications dated April 10, 2026. This addendum is to be identified in each Bidder's bid package. Failure to do so may subject Bidder to disqualification.

This Addendum No. 1 consists of the following:

QUESTIONS:

1. Can the current service disconnect be removed and replaced with a new service rated automatic transfer switch? In lieu of placing the ATS over under the stairs, the ATS would be placed in the same spot as the current service disconnect, saving money on materials and labor.

This would block the egress door and not an approved option.

2. In the event that the current service disconnect must remain, I would like to propose moving the ATS location to the south or right side of the current MDP. The washer and dryer would need to be relocated in this event.

MDOT prefers to keep the washer & dryer in their current location, not an acceptable option.

3. Can you please confirm or deny that the sub-contractors (concrete, excavating) must be registered through SIGMA? Us, the general contractor and electricians, are registered through SIGMA.

No.

DRAWINGS (see clouded areas)

1. Cover Sheet

2. E2.0 updated gas piping.

SPECIFICATIONS - UPDATED

1. 22 05 00 Plumbing General Provisions

2. 22 10 00 Basic Plumbing Materials & Methods

END OF ADDENDUM NO. 1

Respectfully submitted, CENTURY A&E

Stephen F. Aman

Senior Project Manager

Distribution: All Bidders (via Sigma), Josiah Meyers (DTMB)

Project Name: MDOT Plainwell Garage Generator Project Number: MIS032.13 – Addenda 1

SECTION 22 05 00

PLUMBING GENERAL PROVISIONS

F:\Projects\MIS032.13\PM\Specs\Elec\22 05 00 Plumbing General Provisions ADD#1.docx Page 1 CENTURY A&E

PART 1 – GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the contract, including General and Supplementary

Conditions and Division 01 specification sections, apply to this section. If differing requirements are identified elsewhere (in these specifications or on drawings or separate instructions), the more stringent requirement shall be met.

1.2 GENERAL PROVISIONS

A. General:

1. "Provide" means furnish, install, commission, and make fully operational.

2. Submit equipment and product submittals to the Engineer for approval prior to construction per Section 01300 - Submittals.

3. Coordinate shutdown of all utilities with Owner prior to shut down. Temporary shutdown and tie-ins may be required during special off-hour periods.

4. Provide manufacturer's startup services including report submittals as described in individual specification sections.

B. Project includes natural gas piping to one (1) natural gas generators at one (1) site.

1. Coordinate with Owner and natural gas utility company to connect new generator to the upgraded natural gas service.

2. See Utility Connections paragraph below for additional information.

1.3 CONSTRUCTION REQUIREMENTS

A. Contractors shall commission all equipment as specified in the various technical specification sections and as specified in Division 1. The Contractors shall attend commissioning meetings and conduct field tests and submit reports, startup and check equipment and submit reports, and assist with test and balance activities as specified in these specifications and as directed by the Owner and Engineer.

B. Coordinate the fabrication, construction, and installation of all mechanical work with all other trades prior to construction.

1.4 PLUMBING WORK SCOPE SUMMARY

A. Provide new natural gas piping system including pressure regulators, gas cocks, etc., as required and shown on the drawings to the new generator.

B. Commission all plumbing systems as specified.

1. Ensure all plumbing systems are properly tested and placed into operation.

2. Provide as-built red lined drawings indicating final locations, routing, sizes, etc., of all mechanical equipment, ductwork, piping, sensors, etc.

3. See Division 1 for additional requirements.

1.5 INTENT

A. The intent of this division is to call for finished work, tested, and ready for operation.

B. Furnish all materials, supplies, equipment, tools, transportation, and facilities, and perform all labor and services necessary for the complete installation of the plumbing systems as

Page 2 CENTURY A&E shown on the drawings, as herein specified, and as required to make complete and operating systems.

C. The work shall also include the completion of such details of mechanical work not mentioned or specifically shown, but necessary for the successful operation of all mechanical systems.

1.6 CODES

A. Where standards or codes are mentioned, the latest edition or revision in force shall be followed.

B. Contract documents shall take precedence when they are more stringent than codes, ordinances, standards, and statutes. Codes, ordinances, standards, and statutes shall take precedence when they are more stringent or conflict with the drawings and specifications.

C. Should any change be required to conform to the codes, ordinances, and rules, the

Contractor shall notify the Engineer and shall include the costs involved in this work.

Contractor shall be held to complete all work necessary to meet these local code requirements without additional compensation after award of the contract.

1.7 UTILITY CONNECTIONS

A. Contact Michigan Gas Utilities for work required regarding the gas service and meter. The intent is to increase the delivered gas pressure to 2 PSIG as indicated on plans and details and increase capacity with new generator.

1.8 PERMITS AND INSPECTIONS

A. Secure and pay for all permits, inspections, tests, and fees required for the work to be performed.

B. Upon completion of the work, furnish inspection certificates as normally issued in connection with the work.

1.9 DRAWINGS AND SPECIFICATIONS

A. Schedules shown on drawings are for convenience and not intended to be a count of equipment, fixtures, etc. Each supplier shall make a separate count of these items and shall be required to furnish the equipment, fixture, and materials wherever shown on the drawings but not included in the schedule.

B. Drawings show arrangement, general design and extent to the systems and are diagrammatic except where in certain cases they are detailed giving exact locations and arrangement.

C. Drawings are not intended to be scaled for rough-in dimensions. Where shop drawings are required for this purpose or field measurements are needed for the installation, they shall be prepared by the installing contractor.

1.10 SUBMITTALS

A. Prepare all required submittals in accordance with applicable provisions of Section 01300

- Submittals.

Page 3 CENTURY A&E

B. Shop Drawings: Prior to delivery of any material to the job site, the Contractor shall submit shop drawings for review by the Engineer.

C. See individual technical specification sections for additional requirements.

1.11 RECORD DRAWINGS

A. The Contractor shall be responsible to maintain a complete and accurate set of marked up drawings during construction per Division 1.

B. Record drawings shall be delivered to the Engineer after completion of the work as a permanent record of the installation as actually constructed.

1.12 CONTRACTOR RESPONSIBILITY

A. Each Contractor shall be responsible for the safety and good condition of all work and materials in contract until its completion.

B. Assume entire responsibility for all the materials, workmanship and satisfactory performance of the systems installed. It is not intended to limit or restrict the Contractor to the use of materials and manner of shop fabrication or erection that is not in accord with best standard practice.

C. It is also not intended that the drawings or this specification indicate or specify each item or material required to complete a satisfactory installation. Where such items are required and they are considered to be the accepted trade practice to provide same, they shall be considered to be both specified and indicated.

D. The design and construction of all equipment and materials specified herein shall conform in all details with the latest revised codes of the American Society of Mechanical Engineers, the American Standards Association, American Society of Heating, Refrigeration, and Air Conditioning Engineers, and all existing laws, ordinances, and requirements of the state.

1.13 STORAGE, AND HANDLING

A. Protect all materials and equipment during delivery and during storage onsite. Store materials and equipment on suitable blocking to maintain parts clear of the ground and to insure drainage of all rainwater.

1.14 COORDINATION AND COOPERATION

A. Submit to and obtain from trades concerned copies of shop drawings and catalog data of work which connects with or affects their work.

B. Make arrangements with other trades as required to properly correlate installation into the overall project.

C. Each Contractor shall be responsible for establishing elevations and routing of piping and to correlate the work with other trades.

D. Coordinate location and arrangement of equipment, piping, etc. In case of interferences between various items or if simplified construction procedures are possible by relocation or changes in arrangement, change may be made if approved by Engineer in writing.

Page 4 CENTURY A&E

1.15 WARRANTY

A. Warranty all labor, materials, and workmanship for a period of one (1) year from date of final acceptance. Also see Division 1.

B. Alterations, repairs, or replacement of defects in materials, equipment, and labor shall be borne by the Contractor at Contractor's expense.

1.16 MAINTENANCE AND SERVICE ACCESSIBILITY

A. Install equipment and piping to permit service and maintenance to all parts of the systems installed. Minor deviations from the drawings may be made to provide proper accessibility but any major change will require written approval.

PART 2 – PRODUCTS

2.1 GENERAL

A. Reference applicable technical sections in this division for specific systems.

2.2 MATERIALS, EQUIPMENT AND WORKMANSHIP

A. All materials shall be new and shall be prepared, fabricated, and installed with skill and workmanship as is commonly considered to be the best in the trade involved. Work shall be performed at such times as will be best for the proper conduct of the entire project.

B. The Engineer shall notify the Contractor of rejected or faulty work upon discovery, but this failure to detect omissions or violations of the contract will not act as a waiver of the right to demand correction of defects in materials or workmanship.

C. Certain materials and equipment are specified by manufacturer or trade name and catalog or model number to establish standards of quality, performance, design, and suitability for intended use. The products of other manufacturers may be authorized by the Engineer if they are so approved in writing by the Engineer prior to bid.

D. If the Contractor provides approved equipment or materials other than that upon which the design is based, it shall be Contractor's responsibility to coordinate its installation with the work of all other trades and with the space available. Contractor shall also pay for any changes caused to other trades as a result of the substitution.

2.3 EQUIPMENT SUPPORTS

A. Provide the supports and hangers for equipment installed under this work. Where equipment is to be suspended from the roof steel, provide intermediate support members such that the load is carried at the panel points of the joists or trusses.

2.4 COMPONENTS AND REVISIONS

A. Components normally furnished with equipment shall be considered as part of the specification whether specifically mentioned or not. Any revision necessary due to substitution shall be the responsibility of the Contractor without extra cost to the project.

Project Name: Grand Haven Township Water System Standby Power Upgrades

Project Number: GHT001

GENERAL PLUMBING PROVISIONS

Page 5 CENTURY A&E

PART 3 – EXECUTION

3.1 COMMISSIONING

A. See Part 1 of these specifications, individual technical sections, and Division 1 for startup and commissioning requirements.

3.2 EXAMINATION OF PREMISES

A. Verify site conditions under which this work must be conducted prior to commencing.

Contractor shall be held to have examined the premises and shall be satisfied and fully conversant with all conditions. No claim for additional compensation due to Contractor's failure to make this evaluation is allowed.

B. Examine all spaces, surfaces, and areas to receive the work. Do not proceed until corrections, if any required, have been made.

C. Verify dimensions, elevations, grades and obtain all measurements required for proper execution of the work.

D. Verify points of connections to utilities prior to start of construction and report any inconsistency before commencing work.

3.3 INSTALLATION REQUIREMENTS

A. Each subcontractor shall have in charge of work a competent, experienced superintendent who shall be qualified for the work to be performed.

B. Coordinate and schedule the work with other trades to properly expedite the completion of the project. Consult with other trades so they are informed for coordination of all services.

3.4 CLEARANCES

A. Equipment shall be installed so maintenance and replacement can be performed without the removal of other equipment.

B. Clearance around equipment shall be provided for operation, maintenance, replacement, repair, and removal.

C. Piping connections to equipment shall be made with valves, unions, or flange fittings to permit their repair or removal without causing damage to piping or equipment.

D. Install all piping, etc., to accommodate any obstacles anticipated or encountered during construction. Determine exact route and location of piping prior to fabrication.

E. Prior to shop fabrication of piping, make field measurements and make shop drawings to check for clearances and interferences.

F. Due to the scale of drawings, all required fittings, offsets, elevation changes, and routing are not shown. The intent of these drawings and specifications is that these shall be installed without additional cost.

Page 6 CENTURY A&E

3.5 GENERAL CLEANING

A. Upon completion of the work, leave all surfaces broom clean and vacuum all external surfaces.

B. The entire installation shall be thoroughly free from oil and grease, dust and dirt, and any other foreign matter.

C. Special cleaning methods shall be described in individual sections of this specification.

3.6 REMOVAL OF RUBBISH

A. On a daily basis, remove all rubbish, debris, dirt, cartons, materials, etc., resulting from the work. Remove during construction to keep dirt accumulation to a minimum.

3.7 PROTECTION

A. Protect all work from damage and protect the Owner's property from injury or loss during the performance of the work.

B. Properly protect adjacent property as provided by law and the contract documents. Provide and maintain all passageways, guard fences, lights, and other facilities for protections required by local conditions.

C. Any damage shall be repaired to original condition and acceptable to the Owner.

D. Seal all equipment openings, etc., from dirt and debris during construction.

E. Seal all incomplete piping from dirt and debris during construction.

END OF SECTION

SECTION 22 10 00

BASIC PLUMBING MATERIALS & METHODS

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PART 1 GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the contract, including General and Supplementary Conditions and Division 01 specification sections, apply to this section. If differing requirements are identified elsewhere (in these specifications or on drawings or separate instructions), the more stringent requirement shall be met.

1.2 SECTION INCLUDES

A. Basic materials and methods and related items for natural gas piping.

1.3 SUBMITTALS

A. Submit under provisions of Section 01300 - Submittals

B. Product data for the following plumbing related items:

1. Gas piping and associated fittings, strainers, etc.

2. Valves

C. Miscellaneous:

1. Proposed system testing procedures and dates.

2. Results of pressure tests.

1.4 APPLICABLE CODES AND REGULATIONS

A. Michigan Plumbing Code - 2021.

B. Michigan Fuel Gas Code - 2021

PART 2 PRODUCTS

2.1 NATURAL GAS PIPING SYSTEM

A. Natural Gas Service:

1. Mechanical contractor to work with the local gas company to revise the existing gas service, including gas regulator and meter, as necessary. Route natural gas piping to the generator. Provide pressure regulator at the generator as required.

See Section 22 05 00 and the drawings for more information and scope related to the natural gas service.

B. Piping:

1. Interior and Exterior Above Ground 2" and Smaller: Black steel pipe, electric resistance welded, conforming to ASTM A53, Type E, Grade B, Schedule 40, with screwed joints and 125 pound fittings. Elbows to be long radius design. Joints:

NFPA 54, threaded or welded to ASME B31.1

2. All gas piping above grade shall be painted safety yellow and marked "Natural Gas":

3. Exterior Underground:

a. Black steel pipe with plastic X-Tru-Coat pipe coating. Pipe shall meet specifications for interior and exterior piping above.

b. Medium Density Polyethylene conforming to ASTM D 2513, marked "gas" and marked "ASTM D2513".

Page 2 CENTURY A&E

C. Gas Shut-Off Cocks:

1. AGA approved plug cocks in sizes 2" and smaller.

2. Acceptable Manufacturers: DeZurik, Crane, Powell, or equal.

2.2 STRAINERS

A. Size 2 Inch and Under: Screwed brass or iron body, Y pattern with 1/32 inch stainless steel perforated screen.

B. Screen Free Area: Minimum 3 times the area of the inlet pipe.

2.3 PIPE HANGERS AND SUPPORTS

A. Hangers for Pipe Sizes 1/2 Inch to 1-1/2 Inch: Adjustable wrought steel ring.

B. Hangers for Pipe Sizes 2 Inches and Above: Adjustable clevis hanger.

C. Wall Support for Pipe Sizes to 3 Inches: Stainless steel slotted strut and pipe clamp.

D. Vertical Support: Steel riser clamp.

E. Floor Support for Pipe Sizes to 4 Inches and All Cold Pipe Sizes: Stainless steel slotted strut and pipe clamp.

F. Design hangers to impede disengagement by movement of supported pipe.

G. Acceptable Manufacturers: Anvil, B-Line, Fee & Mason, or approved equal.

2.4 FLEXIBLE PIPE CONNECTIONS

A. Steel Piping: Construct with stainless steel inner hose and braided exterior sleeve.

B. Use connectors suitable for minimum 125 psi and 450°F and 200 psi WOG and 250°F.

C. Manufacturers: Universal, Flexonics Kinetics, and Metraflex, or approved equal.

2.5 BALL VALVES

A. Ball Valve: Full port ball valve selected for intended service. See Schedule.

2.6 STEEL BOLTS, STUDS, AND NUTS

A. Comply with the current ASTM A307, Grade B, or approved equal.

B. Threads: American National form right hand machine cut threads complying with the current American Standard for Screw Threads ANSI B1.1, Coarse Thread Series, and Class 2 fit.

C. Provide galvanized or cadmium plated carbon steel bolts and nuts for flanged pipe joints.

D. Provide stainless steel Type 304 bolts and nuts for underground pipe joints.

Page 3 CENTURY A&E

E. Bolt Heads and Nuts: Semi-finished, hexagonal, complying with the dimensions for the current American Standard for Wrench Head Bolts and Nuts and Wrench Openings, ANSI B18.2, Heavy Series.

PART 3 EXECUTION

3.1 INSTALLATION

A. Contractor shall provide survey to locate pipes, elevations, conduits, etc., and prepare shop drawings. Variations to suit existing conditions, structural features or mechanical equipment shall be Contractor's responsibility.

B. Run piping parallel with building lines and as direct as possible

C. Paint all exposed gas piping.

D. Cut pipe accurately and install without springing or forcing. All burrs shall be removed after cutting.

E. Install gas piping to applicable code requirements.

F. Install shut-off valves for all fixtures and equipment.

3.2 PIPE AND FITTINGS

A. Preparation: Ream pipes and tubes, clean off scale and dirt, inside and outside, before assembly. Remove welding slag or other foreign material from piping.

B. Connection: Screw joint steel piping up to and including 2 inches. Weld piping 2-1/2 inches and larger, including branch connections.

C. Make screwed joints with full cut standard taper pipe threads with red lead and linseed oil or other approved non-toxic joint compound applied to make threads only.

D. Use main sized saddle type branch connections or directly connecting branch lines to mains in steel piping if main is at least one pipe size larger than the branch for up to 6 inch mains and if main is at least two pipe sizes larger than branch for 8 inches and larger mains. Do not project branch pipes inside the main pipe.

H. Make connections to equipment and branch mains with unions.

I. Provide non-conducting type connections wherever jointing dissimilar metals in open systems. Brass adapters and valves are acceptable.

G. Tracer Wire: Underground nonmetallic piping must be accompanied by a yellow insulated copper tracer wire or other approved conductor installed adjacent to buried gas pipe. The tracer wire shall terminate above the ground at each end of the nonmetallic piping. The tracer wire size shall not be less than 18 AWG and the insulation type shall be suitable for direct burial.

Page 4 CENTURY A&E

3.3 PIPE HANGERS AND SUPPORTS

A. Support horizontal steel and copper piping as follows:

Nominal Pipe

Size (in.)

Max. Distance

Between Support (ft.)

1/2 to 1-1/2 6 2 & 2-1/2 10

3 & 4 12

B. Install hangers to provide minimum 1/2 inch clear space between finished covering and adjacent work.

C. Place a hanger within one foot of each horizontal elbow.

D. Use hangers that are vertically adjustable 1-1/2 inch minimum after piping is erected.

E. Where practical, support riser piping independently of connected horizontal piping.

F. Do not support pipe from other pipe.

3.4 SLEEVES

A. Wherever possible, set sleeves in position in advance of concrete work. Provide suitable reinforcing around sleeves.

3.5 FLEXIBLE CONNECTORS

A. Installation:

1. Provide flexible pipe connectors on pipes connected to equipment supported by vibration isolation.

2. Accomplish structural work and provide equipment required to control expansion and contraction of piping, loops, pipe offsets, and swing joints and provide corrugated bellows type expansion joints where required.

3. Install flexible connectors at right angles to displacement. Install one end immediately adjacent to isolated equipment and anchor other end.

4. Rigidly anchor pipe to building structure where necessary. Provide guides so that movement takes place along axis of pipe only.

3.6 VALVES

A. General:

1. Provide valves of same manufacturer throughout where possible.

2. Provide valves with manufacturer's name and pressure rating clearly marked on outside of body.

3. Ball valves on natural gas piping are to be CSA/CGA rated for natural gas shut-off.

B. Miscellaneous Valve Schedule:

Type Size Milwaukee Cat. #

Nibco Cat. #

Ball Valves - Natural Gas

2" and smaller BA-475B T-FP- 600A

Page 5 CENTURY A&E

3.7 PIPE AND EQUIPMENT IDENTIFICATION

A. Label all piping showing contents and direction of flow.

B. Place label adjacent to each valve and branch takeoff at each side of a wall or partition through which pipe passes and at 20 feet 0 inch spacing on straight runs.

C. Label Manufacturers: Seton Name Plate Corporation, W.H. Brady, Topflight Tape Company, James H. Mathews, or approved equal.

D. Paint or stencil 1-1/2 inch high black enamel block type letters or numerals on all equipment items.

3.8 TESTING AND CLEANING OF PLUMBING SYSTEMS

A. General:

1. Submit a notice of intention to test to the Architect/Engineer, and Owner at least seven (7) days prior to the test.

2. If desired by any of Architect/Engineer, and Owner to witness the test, coordinate the tests to accommodate the appropriate schedules.

3. Provide pumps, gauges, instruments, test equipment personnel and clean auxiliary water.

4. Submit a complete test report to the Architect/Engineer.

5. Test prior to painting, installation, or concealment.

6. Tests may be made on sections of piping as installed.

7. Re-test repaired or revised piping.

B. Fuel Gas Piping: Inspect, test and purge in accordance with Section 406 of the International Fuel Gas Code.

END OF SECTION