D e p a r t m e n t o f P u b l i c W o r k s S e w e r O p e r a t i o n s

Specifications

Rehabilitation of the City of Minneapolis

Sanitary Maintenance Holes with Polyurethane Coating System

Bid Specs

1901 E 26th St. Minneapolis, MN 55404

MANHOLE REHABILITATION

1. DESCRIPTION

1.1 General

1.2 Definitions

1.3 Submittals

2. MATERIALS

2.1 Structural Repair Mortar

2.2 Structural Repair Bonding Agent…………………………………………………………………………5

2.3 Infiltration Control

2.4 Polyurethane Spray Coating……...……………………………………………………………………….6

2.5 Other Materials……………………………………………………………………………………………7

3. CONSTRUCTION EXECUTION

3.1 Maintenance of Flow

3.2 Manhole Modifications

3.3 Manhole Cleaning

3.4 Structural Repair of Deteriorated Manholes

3.5 Prevention of Active Infiltration

3.6 Manhole Rehabilitation by Spray Application of a Polyurethane Coating

3.7 Debris Removal

3.8 Water Supply for Manhole Rehabilitation

3.9 Temporary Traffic Control

3.10 Quality Assurance

3.11 Acceptance of Work

4. MEASUREMENT AND PAYMENT

4.1 Manhole Rehabilitation

4.2 Removal of Equipment That Becomes Stuck in a Sewer

5. GENERAL CONSIDERATIONS

5.1 Standard

5.2 Partial Payments

5.3 Warranty

5.4 Final Acceptance

MANHOLE REHABILIATION

1. DESCRIPTION

1.1 General

This specification shall govern all work, materials, equipment, and incidentals required for 100% solids polyurethane coating rehabilitation for the purpose of eliminating infiltration, exfiltration, providing corrosion protection, and repair of voids by applying the lining system to the wall and bench surfaces of brick, concrete, or other masonry construction material. There are 53 sanitary sewer maintenance holes that will be rehabilitated by means of the polyurethane coating system, for a total of 600 vertical feet of liner.

Manhole dimensions shall be verified in the field. Generally, the manholes are circular or oval-shaped brick with a 30-inch diameter.

Described are procedures for cleaning, preparation, application, and testing. The applicator, approved and trained by the manufacturer, shall furnish all labor, equipment and materials for applying a polyurethane system to form a monolithic coating with a minimum thickness of 150mils. The applicator will use machinery specially designed for surface preparation; installation of the manhole coating system; removal of steps and other obstructions; patching of structural defects; and preparing outside drops and connections. All aspects of the installations shall be in accordance with the manufacturer’s recommendation and per the following specifications which includes:

A. The removal of any loose and unsound material B. Cleaning of the area to be sprayed C. The elimination of active infiltration prior to coating application D. The repair and filling of voids E. The repair and sealing of the invert and benches F. The spray application of a polyurethane coating system to form a monolithic coating

1.2 Definitions

NASSCO: National Association of Sewer Service Companies Except for these Special Provisions, the NASSCO Specification Guidelines will be followed and are hereby made a part of these specifications.

Debris: The definition of debris will generally be consistent with the nomenclature contained in the NASSCO Specifications Guidelines.

Contract Administrator: The City of Minneapolis Sewer Operations Engineer (Engineer) or their representative.

Applicator: Company performing coating installation.

1.3 Submittals

All materials and procedures required to establish compliance with the specifications shall be submitted to the owner/engineer for review/approval. Submittals shall include at least the following:

A. Proposed product to be used when completing structural repairs for the following:

a. Repair mortar

b. Repair bonding agent

c. Infiltration control

B. Technical Data Sheet on each product used.

C. Safety Data Sheet (SDS) for each product used.

D. ASTM References.

E. CIGMAT Evaluation.

F. Manufacturer’s Letter of Certification of Applicator G. Certified Applicator Minimum Qualifications (Section 3.10) H. Temporary conveyance and maintenance of flow plan

2. MATERIALS

2.1 Structural Repair Mortar

A quick setting fiber reinforced calcium aluminate corrosion resistant cementitious material or an approved equal from the list below shall be used as a patching material and is to be mixed and applied according to manufacturer’s recommendations. Water used to mix mortar shall be clean and potable.

Questionable water shall be tested by a laboratory per ASTM C-94 procedure. Potable water need not be tested.

The structural repair mortar shall have the following minimum requirements:

Patching Material Minimum Requirements Compressive Strength ASTM C109 1400 psi, 6 hrs.

Bond Strength ASTM C882 >1600 psi, 28 days Calcium Aluminate Cement Sulfate resistant Applied Density 105 lbs/ft3 ± 5 Shrinkage ASTM C490 0% at 90% R.H.

Placement Time 5 to 10 minutes Set Time 15 to 30 minutes

Acceptable products:

• BASF Construction Chemicals - Building Systems: Emaco S88 Cl

• Dayton Superior Corporation: Civil/Structural VO

• Euclid Chemical Company (The); an RPM company: Verticoat Supreme

• Sika Corporation; Construction Product Division: SikaRepair 223 or SikaRepair 224

• Strong-Seal QSR

• Approved equal

2.2 Structural Repair Bonding Agent

Epoxy Modified Cementitious Bonding and Anticorrosion Agent: Manufactured product that consists of water-insensitive epoxy adhesive, Portland cement, and water-based solution of corrosion-inhibiting chemicals that forms a protective film on steel reinforcement.

Bonding Material Minimum Requirements

Compressive Strength ASTM C109 4000 psi, 28 days Bond Strength ASTM C882 2000 psi, 28 days

Acceptable Products:

• BASF Construction Chemicals - Building Systems; Emaco P24.

• Dayton Superior Corporation: Perma Prime 3C

• Euclid Chemical Company (The), an RPM company; Duralprep A.C.

• Sika Corporation, Construction Product Division; Armatec 110 EpoCem.

Bonding Agents and Patching/Repair Mortars shall be from the same manufacturer.

2.3 Infiltration Control

A rapid setting chemical grout product specifically formulated for leak control shall be used to stop water infiltration and shall be mixed and applied according to manufacturer’s recommendations and shall have the following minimum requirements:

A. While being injected, the grout must be able to react/perform in the presence of groundwater.

B. Grout shall have ability to increase grout mix viscosity, density and gel strength by increased concentration of constituents or the use of approved additives.

C. The cured grout must withstand submergence in water without degradation.

D. The resultant grout formation must be homogeneous and prevent the infiltration of ground water through the pipe joint.

E. The grout must not be biodegradable.

F. The cured grout should be chemically stable and resistant to organics found in sewage.

G. Residual grout shall be easily removable from the sewer line to prevent blockage of the sewage flow.

Acceptable products:

1. Water based chemical grout products and manufacturers:

• DeNeef Hydro Active Multi Gel NF

• Avanti AV-100

• Avanti AV-118

• Approved equal

2. Acrylate based grout products and manufacturers:

• DeNeef AC-400

• DeNeef Gelacryl SR

2.4 Polyurethane Spray Coating

Polyurethane spray coating products or approved equal shall be used to form a monolithic coating covering all interior substrate surfaces and shall conform to the following standards:

A. ASTM D7234 - Adhesion B. ASTM D624 - Tear Strength (PLI) C. ASTM D2583 – Hardness D. ASTM D1737 - Flexibility (1/2” mandrel) E. ASTM D4060 - Taber Abrasion (mg loss)

Spray Coating Minimum Requirements Compressive Strength ASTM D695 1050 psi.

Flexural Strength ASTM D790 8630 psi Tensile Strength ASTM D638 4900 psi Barcol Hardness Impressor #L25 72-75 Adhesive Strength Direct to Concrete Substrate Failure Set Time 15 to 30 minutes

Equipment used for the installation of coating materials must be as recommended by the manufacturer and must be of high quality. Spray equipment shall be specifically designed to accurately ratio and apply the coating system.

No products with epoxy-based resins will be accepted.

Acceptable products:

• Zebron 386

• Spectrashield

• Approved equal o To be considered by the Engineer as an approved equal, the proposed polyurethane coating system shall have been successfully installed in sanitary sewer maintenance holes for a minimum of five (5) years within municipal wastewater collection systems.

2.5 Other Materials

No other materials shall be used with the aforementioned products without prior approval from the Engineer or recommendations from the manufacturer.

3. CONSTRUCTION EXECUTION

3.1 Maintenance of Flow

Place covers over the manhole invert to prevent extraneous material from entering the sewer lines before cleaning OR provide temporary conveyance of wastewater OR install a temporary bridge of flow through pipe inside the manhole to maintain flow during manhole rehabilitation.

Do not perform work until plans for temporary conveyance or protection of flow through manhole have been submitted and approved by the Engineer.

3.2 Manhole Modifications

Remove existing steps flush with the interior surface.

Cut and remove all pipe projections, including outside drops to within 2 inches of the interior structure wall. Mainline pipes shall be removed to within 4 inches of the interior structure wall.

Manholes to be modified will be on a case by case basis brought forth by the Contractor and agreed upon with the Engineer.

3.3 Manhole Cleaning

Provide means to prevent manhole cleaning debris from entering the sanitary sewer. Collect and properly dispose of debris off site.

Clean existing manhole surfaces using a minimum 5,000 psi @ 5 gpm pressure washer or abrasive blasting. After this initial cleaning, utilize degreasers, detergents, and/or buffers to provide suitable surface pH, if necessary.

The surface preparation method shall produce a cleaned, abraded and sound surface with no evidence of laitance, loose concrete, brick or mortar, contaminants or debris, and shall display a surface profile suitable for application of the liner system.

3.4 Structural Repair of Deteriorated Manholes

Repair deteriorated manhole surfaces after cleaning and modifications.

Any bench, invert, or manhole wall repairs shall be made at this time using a quick setting patching mix.

Place repair mortar fillet around each pipe projection to provide a smooth transition from the structure wall to the pipe projection. Install bonding agents and repair mortar in accordance with manufacturer’s written recommendations.

Trowel repair mortar to provide a smooth surface over large voids and exposed reinforcement. Roughen repair mortar surface to leave a suitable profile for bonding of liner.

Repair mortar shall be fully cured prior to the manhole rehabilitation process.

3.5 Prevention of Active Infiltration

Active leaks shall be stopped using quick setting, specially formulated mixes, according to manufacturer’s recommendations.

Some leaks may require weep holes to localize the infiltration during the application. After application the weep holes shall be plugged with the quick setting material prior to the application of the final coat.

When severe infiltration exists, drilling may be required in order to pressure grout using a chemical grout.

Manufacturer’s recommendations shall be followed when pressure grouting is required.

3.6 Manhole Rehabilitation by Spray Application of a Polyurethane Coating

Spray equipment shall be specifically designed to accurately ratio and apply the coating system.

Following the aforementioned steps, any polyurethane product manufacturer specific primer shall be applied to the walls and floor of the manhole to a thickness of 1-3 mils.

Spraying of the polyurethane coating material shall be continuous without interruption until each application is complete. The surface shall be clean and free of all foreign material without noticeable free water droplets or running water prior to application of material. Materials shall be spray applied in the above specified thicknesses in one or more passes from the bottom of the casting frame. Once the application is completed, a spark test of the coating shall be completed to confirm there are no defects.

Final installation shall be a minimum of 150mils.

The covers shall be removed at this time and the bench sprayed with materials per specifications as mentioned above and spray applied in such a manner that a gradual slope is produced from the walls to the invert. The wall/bench intersection shall be rounded to a uniform radius the full circumference of the intersection.

3.7 Debris Removal

If needed, debris from the sewer system shall be continuously removed from the manhole during manhole rehabilitation. Do not allow debris to be passed into the downstream sewer unless approved by the Contract Administrator.

Debris within the sewer system will be removed from the sewer system using truck-mounted vacuum extraction.

Debris of material removed from the sewer system will be disposed of at the City’s Linden Yard disposal site. There will be no charge for disposal since this is a City project and Linden Yard is a City owned facility. Any disposal of debris at the Linden Yard will be between the hours of 7:00am and 3:00pm, Monday through Friday. The Linden Yard is located at 816 W. Linden Ave, Minneapolis, MN, 55403.

The Contractor shall be responsible for all construction debris removal off site. No construction debris will be disposed of at the Linden Yard facility.

3.8 Water Supply for Manhole Rehabilitation

Water for use in cleaning or lining can be obtained from the City’s water distribution system fire hydrants. Fire hydrant connections will be metered and will include a backflow preventer according to City Water Department requirements. Final costs will be invoiced for actual charges from the City’s Water Department.

The City Water Department will charge a connection and reconnection fee to hook up to a hydrant or move to a different hydrant. Only Minneapolis Water Department employees can do this. For more detailed information contact the permit office at (612) 673-2865, call the Minneapolis Water Department at (612) 673-5600, or go to the Public Service Center located at 505 Fourth Ave. S., Room 620B, Minneapolis.

3.9 Temporary Traffic Control

The contractor shall provide, install and maintain temporary traffic control devices and perform temporary traffic control in strict accordance to the MN MUTCD field manual. All traffic control devices and signage shall conform to the MN MUTCD field manual. The cost of any barricades or temporary traffic control measures shall be included with, and incidental to, other bid items in the contract, unless noted otherwise.

Please be aware as these requirements may affect your cost proposal.

For any manhole rehabilitation required in areas where arterial roads will be affected including closing portions of the road, the contractor shall submit a traffic control plan for review to the Traffic Department (Brandon Sandberg 612-673-5319) or via the Right of Way Permitting Website (https://minneapolis.mn.roway.net) one (1) week in advance of such work.

The contractor shall be required to obtain the City of Minneapolis Lane Use/Obstruction Permit for any work pertaining to the manhole rehabilitation of sanitary sewers within the City of Minneapolis.

3.10 Quality Assurance

The applicator shall be trained and certified by the manufacturer for the handling, mixing, application, and inspection of the liner system as described herein. To ensure total unit responsibility, all materials and installation thereof shall be furnished and coordinated by Manufacturer/Certified Applicator.

A Certified Applicator must have successfully installed 1,000 vertical feet of manhole lining in the last three (3) years. A documented installation history must be supplied to include; Owner Name, Contact Information, Project Description, Volume of Product Installed and Contract Duration.

The final liner system shall be at least 150mils thick, and free of pinholes or voids.

3.11 Acceptance of Work

After manhole rehabilitation has been completed for a specific location, notify the Contract Administrator for review and determination whether work performed is acceptable. The Contract Administrator will have the ability to review rehabilitated manholes within 2 days of notification.

Perform remedial work for manhole cleaning and repair, and a re-inspection for the locations where the work was determined by the Contract Administrator as not being acceptable. Any deficiencies in the finished liner shall be marked and repaired according to the Manufacturer’s recommended procedures.

At the direction of the Engineer or their representative, the rehabilitated structure shall be tested by any one of the following methods:

• Visually verify the absence of leaks.

• Perform an exfiltration test.

o For manholes 0 to 6 foot deep, if water loss is 1 inch or less in 5 minutes, manhole rehabilitation is acceptable.

o For manholes over 6 feet deep, if water loss is 1 inch plus 1/8 inch for each additional foot of depth of less in 5 minutes, manhole is acceptable.

All rehabilitated manholes shall be visually inspected for quality workmanship and absence of leaks.

20% of manholes shall be exfiltration tested. These manholes shall be selected by the Engineer or their representative in random order within 2 days of notification of each completed manhole but no more than 5 days.

4. MEASUREMENT AND PAYMENT

4.1 Manhole Rehabilitation

Manhole rehabilitation will be measured on a vertical length basis for each manhole and paid for at the Contract Unit Price per line item based on type of rehabilitation. Length to be paid for will be the total length of manhole rehabilitated in accordance with this specification, accepted and measured by the Contract Administrator.

Measurement will be made vertically from the bottom of casting to the bench of the manhole. If there is no bench in the manhole, measurement will be made to the floor of the manhole.

95% of the payment will be made upon satisfactory completion of the lining work. The remaining 5% of the payment will be made upon final acceptance of the manhole rehabilitation as determined by the review of the corresponding inspection reports by City of Minneapolis personnel.

4.2 Removal of Equipment That Becomes Stuck in a Sewer

The Contractor will pay costs for excavating down to the top of the sewer pipe, repairing the sewer after the equipment is removed, backfilling the excavation, and restoring the surface if the Contractor is deemed to have completed operations in a negligent manner.

No payment or extra time will be given for equipment downtime and attempted equipment retrieval.

5. GENERAL CONSIDERATIONS

5.1 Standard

• The Contractor shall schedule their operations and viewing between 7:00 a.m. and 4:00 p.m.

Monday through Friday. If the Contractor requires work to be completed outside of this timeframe, the Contractor shall bring their proposal to the Contract Administrator forty-eight

(48) hours in advance of the work to be agreed upon by the two parties. The Contractor shall not do any work which requires inspection on Saturdays, Sundays, Federal, State or City Holidays, unless approved by the Contract Administrator.

• The Contract Administrator or their representative will communicate regarding additional work items for the City and will be able to make decisions in a timely manner.

• The Contractor shall submit a daily progress report on a bi-weekly basis. This report will include but is not limited to the location of manholes rehabilitated, manhole rehabilitation dates, linear footage of manholes lined, equipment/vehicle number(s), operator/crew name(s), notation documenting repair work completed prior to coating the manholes, and any testing to the manhole to verify coating quality.

• The contract will be awarded based on the low bid total of items one through three on the proposal. However, the City reserves the right to decrease quantities should the total bid exceed budgeted funds. The City also reserves the right to increase the bid quantities should additional funds remain in this contract or become available. Additional quantities that are added to the contract will be paid at the same unit rates as submitted on the bid form.

5.2 Partial Payments

Payment requests shall be itemized according to the three bid items on the proposal and shall show the breakdown of cumulative totals less previous pay request totals.

Payment for Mobilization will be invoiced and paid at fifty (50) percent of the bid item on the first payment request. The other fifty (50) percent of the Mobilization rate will be invoiced and paid on the final payment request.

Invoice and Payment All work requested under this Contract shall be placed on a City issued Purchase Order.

Contractor shall make all reasonable efforts to submit invoices and documentation in an electronic format, such as PDF or other format compatible with City software capabilities, in lieu of paper invoices and documentation, when so requested by City.

Upon delivery and acceptance of the service, the Contractor shall submit an invoice detailing the appropriate charges.

Invoices shall be submitted to:

City of Minneapolis 505 Fourth Ave S, Room 310 Minneapolis, MN 55415 Email: submitinvoices@minneapolismn.gov

Upon receipt of invoice and final inspection and acceptance of the service, the City will render payment within thirty (30) days unless any items thereon are questioned, in which event payment will be withheld pending verification of the amount claimed and the validity of the claim. The Contractor shall provide complete cooperation during any such investigation.

The City will not pre-pay for service. All bills shall state the location and dates of service being billed. All fees, taxes, charges, surcharges, and revenue payments are to be itemized.

No payment will be made for material stored off-site except in situations where payments may be considered by the City for materials which are stored in a secured area, to be verified by the City and where the Contractor maintains adequate insurance coverage protecting specific materials from loss.

Proof of insurance shall be supplied prior to payment for any materials stored off-site.

5.3 Warranty

Contractor shall warranty the manhole liner and repair any failing conditions that match the length of the manufacturer’s warranty.

5.4 Final Acceptance

Twice per month, the Contractor will provide data recorded in the daily progress reports. The Owner shall have ten (10) working days to accept the work. Upon Owner acceptance, an invoice for the accepted work can be submitted by the Contractor.

The estimated “notice to proceed” date will be November 2, 2026, and all work must be completed by December 31, 2026.

If the Contractor and the City agree, this contract may be extended one (1) additional year at the same prices

Non-Exclusive Any contract(s) resulting from this Request for Bid will not be an exclusive contract and the City reserves the right to hire other contractors, to perform similar work, and seek bids from other vendors.

Rights of the City The City reserves the right to reject all or any part of any bid, waive informalities, and award the contract to the lowest responsive and responsible contractors to best serve the interest of the City. Informality shall mean a minor defect or variation of a bid from the exact requirements of the Request for Bid which does not affect the price, quality, quantity, or delivery schedule for the goods, services or construction being procured.

Quantities The quantities specified in this Contract are estimated only. They may not indicate the actual quantity which will be ordered, since such volume will depend upon requirements which develop during the Contract period.

Quantities shown shall not be construed to represent any amount which the City shall be obligated to purchase under the Contract or relieve the Contractor of its obligation to fill all orders placed by the City.