TOWN OF NORTHBRIDGE

Department of Public Works

Three Priority Bridges Rehabilitation Project

Invitation for Bid

Contracting Authority: Town Manager's Office

Memorial Town Hall 7 Main Street Whitinsville, MA 01588

TOWN OF NORTBBRIDGE “THREE PRIORITY BRIDGES REHABILITATION PROJECT”

INVITATION FOR BID

Under the provisions of Massachusetts General Laws, Chapter 30 §39M, the Town of Northbridge, Massachusetts is accepting sealed bids for the Three Priority Bridges Rehabilitation project set forth in this Invitation for Bids (IFB). Bids will be accepted until 10:00 a.m., Thursday, 16 July 2026 at the Town Manager's Office, Memorial Town Rall, 7 Main Street, Whitinsville, MA 01588. Bids shall be submitted in a sealed envelope clearly marked on the outside “THREE PRIORITY BRIDGES REHABILITATION PROJECT, 10:00 a.m., Thursday, 16 July 2026”.

GENERAL CONDITIONS AND INSTRUCTIONS TO BIDDERS

This contract is being procured under the applicable provisions of Massachusetts General Laws Chapter 30, Sections 39 A through 39 R inclusive which are incorporated herein by reference. MassDOT prequalification of contractors with the class of work as, “Bridge – Construction” for the project with an estimated value of $424,522 will be required.

Bid documents will be made available to prospective bidders upon written request via email. Requests for bid documents may be submitted to Christopher Malsch, P.E. via email at cmalsch@hshassoc.com. Bid documents will be made available by June 24, 2026 at 9:00AM.

The Town of Northbridge reserves the right to reject any and all bids received as a result of this Invitation for Bids (IFB) and to waive informalities on the bid process. The bid acceptance period for this IFB will be thirty (30) calendar days from the date of bid opening.

If any changes are made to this IFB, an addendum will be issued. Addenda will be e-mailed or faxed to all bidders on record as having picked up or received the IFB. If addenda are issued, bidders must execute the addenda acknowledgement sheet and include it with the bid.

Questions concerning this invitation for bids must be submitted in writing to: Christopher Malsch, P.E. before 10:00 a.m., on Thursday, 9 July 2026. Questions may be mailed to emailed to cmalsch@hshassoc.com.

Written responses will be issued in an addendum by e-mail to all bidders on record as having received the IFB.

Bid prices will include the cost of signage, barrels, warning lights and other traffic control devices. All traffic controls shall be in accordance with the recommendations of the Manual on Uniform Traffic Control Devices. The contractor shall be responsible for arranging, scheduling and paying for all police traffic control details. An allowance has been included on the bid forms for police details. Contact the Northbridge Police Department at (508) 234-6212 to arrange details.

Payment for all items will be made within thirty (30) calendar days after completion of the work or item, and submission of a detailed invoice for payment and copies of certified payroll forms as stated below. Payments cannot be made until payroll forms are received. Measurements for payment shall be based on certified weight tickets, actual quantities of materials installed or delivered, or field measurements of work completed.

Prevailing Waee Rates: Minimum prevailing wage rates as determined under Massachusetts General Laws, Chapter 149, Sections 26 to 27H by the Commonwealth of Massachusetts, Department of Labor and Workforce Development, Division of Occupational Safety attached to this bid package apply to all work to be performed under this IFB. A true and accurate record must be kept of all persons employed on this project for which these rates have been provided. A payroll form is enclosed which must be submitted to the awarding authority on a weekly basis for all work performed under this contract. Additional requirements noted on the attached form from the Division of Occupational Safety must be completed. Contractor must certify that all employees to be employed at the worksite have successfully completed a course in construction safetv and health approved by the United States Occupational Safetv and Health Administration that is at least ten f10J hours in duration at the time the employee beEins work and furnish documentations of successful completion of said course with the first certified payroll reDort for each employee.

Insurance:

Before commencing any work, the contractor shall submit a certificate of insurance naming the Town of Northbridge as “Additional Insured”. The following minimum limits shall apply:

Commercial General Liability

Per occurrence/aggregate - S1,000,000/$2,000,000

Bodily Iniurr and Accidental Death — General LiabilitY Each Person/aggregate $500,000/$500,000

Property Damage — General Liability

Each person/aggregate $500,000/$500,000

Bodilv Starr and Accidental Death — Automobile Liability Each person aggregate $500,000/$500,000

ProoertY Damage — Automobile Liability Each person/aggregate $500,000/$500,000

Emolover's Liabilitv Insurance Workmen's Compensation Not less than $1,000,000 each accident

Umbrella or Excess Liability Insurance Not less than $2,000,000 over and above primary limits

Bidders must sign the attached Affidavit, Certificate of Non-collusion, Hold Harmless Agreement and Certificate of Compliance and return them with their bids.

Bid Bonds. Performance Bonds, Payment Bonds:

Each bid must be accompanied by a bid bond, certified check or a treasurer's or cashier's check issued by a responsible bank or trust company, payable to the Town of Northbridge in the amount of five (5) percent of the value of the bid. As soon as bid prices have been compared, the Town will return the bid deposits of all except the three lowest responsible bidders. When the contract is executed, the bid deposits of the two remaining unsuccessful bidders will be returned. The bid deposit of the successful bidder will be retained until the payment bond and performance bond have been executed and approved, after which it will be returned.

A performance bond and a payment bond, each in the amount of fifty (50) percent of the total bid price, with a corporate surety qualified to do business under the laws of the commonwealth of Massachusetts and satisfactory to the Town, will be required of the Contractor for the faithful performance of the contract. Attorneys-in-fact who sign bid bonds or payment and performance bonds must file with each bond a certified and effective dated copy of their power of attorney.

Supervision:

The contractor shall have a full-time qualified supervisor capable of reading, writing, and conversing fluently in the English language on the job site at all times while work is in progress. This supervisor will oversee the work of the contractor and any sub-contractors and will report to the Director of Public Works or his designee any problems encountered as well as reports of progress.

Contract Performance Period/Progress Schedule:

The performance period for this proposed contract is ninety (90) calendar days. Contractor must start work within thirty (30) calendar days from the date of receipt of written Notice to Proceed and complete all work within ninety

(90) calendar days after Notice to Proceed.

Basis of Award/Issuance of Work Items: Any contract resulting from this Invitation For Bids will be awarded based on the low acceptable “Total Bid” price for all work items as listed on the Bid Form. All work is subject to the availability of funds. If additional funds become available before the end of the performance period the Town may issue additional work items to the Contractor in priority order until all items have been completed.

Traffic Safetv:

The contractor shall provide and install all necessary construction signs, barricades, barrels, flagging and ropes in the work area. All traffic controls shall be in accordance with the recommendations of the Manual on Uniform Traffic Control Devices. Prior to the start of work, the contractor shall submit a work area signage plan to the Town for approval. All approved signage shall be in place before the start of actual work. The contractor shall be responsible for arranging, scheduling, and paying for all police traffic control details. Contact the Northbridge Police Department at (508)-234-6212 to arrange details. The bid forms include an allowance for Police Traffic Control Details. The contractor will be reimbursed for the actual cost of traffic control details. The contractor must furnish proof of payment before details will be reimbursed.

Special Notice to Bidders

The bidder's attention is directed to the following:

M.G.L. CH. 131 ORDER OF CONDITIONS

This project is subject to the Massachusetts General laws, Chapter 131, Section 40 as amended, and has been issued a Order of Conditions by the Northbridge Conservation Commission. The Order of Conditions by shall be considered part of this contract and a copy and all attachments and references shall be on-site at all times while construction activities regulated by the Order of Conditions are being performed. The Contractor is hereby notified that s/he shall be responsible and held accountable for performing any/all work necessary to satisfy and comply with the entire Order of Conditions including but not limited to every Condition, Requirement, and all referenced plans or documents just though the “Contractor” were the “Applicant” named in the Order of Conditions. If the Contractor initiates any changes/modifications to the Order of Conditions for this project, s/he shall be responsible for obtaining any amended or additional environmental permits. The Town of Northbridge shall not be responsible for any time delays or monetary claims associated with permit modifications initiated by the Contractor.

A complete copy of all the M.G.L. Ch. 131 Order of Conditions applicable to this project is included in this Information for Bidders (IFB) for reference. All requirements shall be in full force and effect on the contractor and his construction activates as if they had been issued directly to the “Contractor” as the “Applicant” by the Northbridge Conservation Commission.

The Contractor shall be required to notify the Conservation Agent at least 48 hours in advance, counting Mondays through Wednesdays only, of work at each location. Contractor shall be required to read and sign the Orders of Conditions included in APPENDIX B of this IFB. This work includes, but is not necessarily limited to, all aspects of the Order of Conditions provided in APPENDIX B of this IFB.

The Contractor is advised that no additional compensation will be allowed for work required to establish, achieve, and maintain compliance with the Order of Conditions, as payment for the work shall be included in the respective bid items.

TOWN OF NORTHBRIDGE

Northbridge Three Priority Bridges

All work done under this contract shall be done in conformance with the Commonwealth of Massachusetts Department of Transportation Standard Specifications for Highways and Bridges dated 2024, and the Supplemental Specifications dated March 31, 2024; the 2017 Construction Standard Details, the 2009 Manual on Uniform Traffic Control Devices (MUTCD) with Massachusetts Amendments and the Standard Municipal Traffic Code; the Plans and these Special Provisions.

SCOPE OF WORK

The work under this Contract consists of the rehabilitation of three existing bridges in Northbridge, MA. Repair work for these three structures includes, but not necessarily limited to, the following:

The existing Bridge No. N-21-001 (1CW) is a 51’-0”± stone arch bridge on Church Street that spans over the Blackstone River. The rehabilitation on this bridge includes waterway debris removal, reinforced concrete excavation, HMA patching, TL-2 single faced guardrail with anchorage and tangent ends, single faced transition to rigid barrier at the bridge, removal of highway guardrail, installation of guardrail posts, the removal and rebuild of stone masonry barrier, floating silt fence, traffic cones for traffic management, temporary traffic control for guardrail installation, concrete repair work above and below water, cement for pointing, mortar patching and grout of the existing substructure and steel reinforcement including drilling and grouting of dowels.

The existing Bridge No. N-21-016 (1D1) is a 21’-9½”± simple span steel stringer bridge on Linwood Avenue that spans over Linwood Pond. The rehabilitation on this bridge includes reinforced concrete excavation, gravel borrow for backfilling, replacement of cement concrete sidewalk, traffic cones for traffic management, concrete repair work above and below water, grout repairs, steel reinforcement, and temporary falsework.

The existing Bridge No. N-21-017 (6U9) is a 11’-4”± clear span concrete slab bridge on Church Street that spans over Abandoned Blackstone Canal. The rehabilitation on this bridge includes bridge vegetation and waterway debris removal, TL-2 single faced guardrail with anchorage and tangent ends, removal of existing guardrail, traffic cones for traffic management, concrete slab repair, mortar for existing concrete slab repair work and steel reinforcement.

ENVIRONMENTAL PERMITTING

If field conditions and/or erection, demolition, storage, or other procedures not originally allowed by existing environmental permits require work to occur in or otherwise impact water or wetland resource areas, the Contractor is advised that no associated work can occur until all required environmental permits have been either amended or obtained allowing such work. The Contractor must notify the Town in writing at least 60 days prior to desired commencement of the proposed activity. All environmental submittals, including any contact with Local, State, or Federal environmental agencies, must be coordinated with the Town. The Contractor is expected to fully coordinate with requests for information and provide the same in a timely manner. The Contractor is further advised that the Town will not entertain a delay claim due to the time required to modify or obtain the environmental permits.

SPECIAL PROVISIONS

Town of Northbridge Department of Public Works - Highway Division

Unless otherwise amended by Special Provisions or Contract Drawings, all work and all contract bid items shall conform to the requirements of the applicable “Sections” of the Commonwealth of Massachusetts Department of Transportation Standard Specifications for Highways and Bridges dated 2024, and including any and all amendment’s or addenda thereto, hereinafter referred to as the “Standard Specifications”.

ITEM 103.1 BRIDGE VEGETATION REMOVAL LUMP SUM

The work to be done under this item shall conform to the relevant provisions of Section 100 of the Standard Specifications and the following:

Work under Item 103.1, Bridge Vegetation Removal, shall consist of removal of trees, weeds, brush, roots, or any other foreign material growing on the bridge structure as called out on the plans or as directed by the Engineer. All materials removed shall become the property of the Contractor and shall be properly disposed away from the work site.

COMPENSATION

Bridge Vegetation Removal will be paid for at the Contract unit price per lump sum, which price shall include all labor, materials, equipment and incidental costs required to complete the work.

ITEM 104.1 WATERWAY TIMBER DEBRIS REMOVAL – LUMP SUM

BRIDGE NO. N-21-001

ITEM 104.2 WATERWAY TIMBER DEBRIS REMOVAL – LUMP SUM

BRIDGE NO. N-21-017

The work to be done under this item shall conform to the relevant provisions of Section 100 of the Standard Specifications and the following:

Work under Items 104.1 and 104.2, Waterway Timber Debris Removal – Bridge No. N-21-001 and Waterway Timber Debris Removal – Bridge No. N-21-017, shall consist of removal of dead trees, timber, debris, roots, stumps, or any other foreign material in the waterway which can restrict flow or potentially cause damage to the bridge structures during a high flow event as called out on the plans or as directed by the Engineer. All materials removed shall become the property of the Contractor and shall be properly disposed away from the work site.

COMPENSATION

Waterway Timber Debris Removal – Bridge No. N-21-001 and Waterway Timber Debris Removal

– Bridge No. N-21-017 will be paid for at the Contract unit price per lump sum, which price shall include all labor, materials, equipment and incidental costs required to complete the work.

ITEM 127.12 REINFORCED CONCRETE EXCAVATION CUBIC FOOT

The work to be done under this item shall conform to the relevant provisions of Sections 112, 120 and 140 of the Standard Specifications and the following:

Work under Item 127.12, Reinforced Concrete Excavation, shall include sawcutting, excavation, and partial removal of the existing sidewalk at Bridge N-21-016 (1D1) and full removal of the existing Northeast and Southwest concrete wingwall caps at Bridge N-21-001 (1CW), as shown on the plans. The Contractor shall keep the job site secure and any necessary barrier, fencing, or other shall be considered incidental to this Item. Concrete removal for spall repairs, as shown on the plans, shall be considered incidental to Item 905.01. The limits of concrete removal shall be as indicated on the plans or as directed by the Engineer. In addition, the Contractor is required to remove all dust, loose concrete and debris encountered as part of the excavation prior to installation of the new concrete.

All concrete materials removed shall become the property of the Contractor and shall be properly disposed away from the work site.

The edges of final surfaces where concrete is to be partially removed under this Item shall be sawcut to a depth of 1 inch with an approved power saw capable of making straight cuts. Re-entrant corners shall not be allowed. All costs in connection with sawcutting shall be considered incidental to this Item.

Grit blasting equipment or other methods capable of removing rust and old concrete from exposed reinforcing steel to remain shall be used when, in the opinion of the Engineer, deemed necessary.

The Engineer may reject the use of any methods or equipment that causes undue vibration or possible damage to the existing substructure.

The Contractor shall take all measures necessary to protect the final cut surface from damage. The Engineer may reject the use of any method or equipment that may cause damage to the existing substructure to remain.

The Contractor’s operations shall not result in any damage to adjacent structures or foundations. Any damage to adjacent structures that are to remain that are damaged as a result of the Contractor’s operations, shall be repaired by the Contractor to the satisfaction of the Engineer and at no additional expense.

The Contractor shall take all measures necessary to ensure that concrete, reinforcing steel, other demolition materials, tools and equipment will be prevented from falling into Linwood Pond, Blackstone River and Blackstone Canal and shall submit a plan, schedule and procedure for approval prior to performing the work. Any shielding used to perform this work shall be considered incidental to this item.

All materials, equipment, labor, etc. to accomplish this task shall be considered incidental to this Item.

ITEM 127.12 (Continued)

COMPENSATION

Reinforced Concrete Excavation will be measured for payment by the cubic foot, based on the limits shown on the Plans or as directed by the Engineer.

Reinforced Concrete Excavation will be paid for at the Contract unit price per cubic foot, which price shall include full compensation for all labor, materials, equipment and incidental costs required to complete the work.

ITEM 628.221 TRANSITION TO RIGID BARRIER (SINGLE EACH

FACED) – ON BRIDGE

The work to be done under this item shall conform to the relevant provisions of Sections 600 and 975 of the Standard Specifications and the following:

Work under Item 628.221, Transition to Rigid Barrier (Single Faced) – On Bridge, shall include construction of guardrail transitioning to stone masonry barrier, including fabrication, delivery and installation of new steel guardrail posts including base plates, anchor bolts, and anchor plates on the proposed wingwall caps, as shown on the plans. Coring and grouting of threaded rods into the existing stone masonry bridge parapet at the terminal connector shall be considered incidental to this item.

COMPENSATION

Transition to Rigid Barrier (Single Faced) – On Bridge will be measured and paid for at the Contract unit price per each, in place, which price shall include all labor, materials, equipment and incidental costs necessary to complete the work.

ITEM 632.01 GUARDRAIL POST – STEEL ON BRIDGE EACH

The work to be done under this item shall conform to the relevant provisions of Subsections 630 and 975 of the Standard Specifications and the following:

Work under Item 632.01, Guardrail Post – Steel On Bridge, shall include fabrication, delivery and installation of new steel guardrail posts including base plates, anchor bolts, and anchor plates on the proposed wingwall caps, as shown on the plans. Guardrail Posts within the Transition to Rigid Barrier (Single Faced) – On Bridge limits as shown on the plans, shall be considered indcidental to Item 628.221.

COMPENSATION

Guardrail Post – Steel On Bridge will be measured and paid for at the Contract unit price per each, in place, which price shall include all labor, materials, equipment and incidental costs necessary to complete the work.

ITEM 690.01 STONE MASONRY BARRIER REMOVED CY

AND REBUILT IN CEMENT MORTAR

The work to be done under this item shall conform to the relevent provisions of Subsection 690 of the Standard Specifications and the following:

The work under item 690.01 shall include removal and rebuilding of the existing stone masonry barrier wall to the lines and grades shown on the plans at all four (4) corners of Bridge No. N-21- 001 (1CW), and as directed by the engineer. The Contractor’s operations shall not result in any damage to adjacent structure that is designated to remain, beyond the limits of removal shown on the plans. Any damage to adjacent portions of the structure that are to remain that are damaged as a result of the Contractor’s operations, shall be repaired by the Contractor to the satisfaction of the Engineer and at no additional expense.

Removal and repouring of the existing concrete cap, including all labor, materials, and equipment necessary to form, reinforce and pour the porposed concrete cap, is considered incidental to this item. All reinforcing shall conform to the requirements of Section M8.01.0 of the Standard Specification and be epoxy coated. All concrete for the cap shall be placed in accordance with the requirements of Subsection 901 of the Standard Specification.

COMPENSATION

Stone Masonry Barrier Wall Removed and Rebuilt in Cement Mortar will be measured by the Cubic Yard and will be paid for at the Contract unit price per Cubic Yard, which shall include all labor, materials, equipment, and incidental costs necessary to complete the work.

ITEM 697.2 FLOATING SILT FENCE FOOT

The work to be done under this item shall consist of installation of floating silt fence to prevent silt from polluting the waterway during construction. The floating silt fence shall be placed as indicated on the plans or as directed by the Engineer. The floating silt fence myabe have to be adjusted, relocated or removed and reset to accommodate construction operations. No additional compensation will be made for adjustments, relocations or resetting of the floating silt fence.

Installation shall be in accordance with the manufacturer’s instructions. The Contractor shall submit the product data sheet and manufacturer’s instructions to the Engineer for approval prior to any work in the waterway is to commence.

The Contractor shall check the floating silt fence daily and shall clear accumulated silt and debris as needed. The floating silt fence shall be in good working condition and shall be repaired or replaced if found not in good working condition, at the Contractors own expense. The Contractor shall properly dispose of any accumulated silt and debris.

COMPENSATION

Floating Silt Fence will be measured by the Foot and will be paid for at the Contract unit price per Foot, which shall include all labor, materials, equipment, and incidental costs necessary to complete the work including any adjustments, removal at the completion of work and disposal of any debris.

ITEM 851. TEMPORARY TRAFFIC CONTROL LUMP SUM

FOR GUARDRAIL RECONSTRUCTION

The work under this item shall confirm to the relevant provisions of Section 850 of the Standard Specifications and the following:

Before starting any work under this Contract, the Contractor shall prepare and submit to the Engineer for approval, a plan that indicates the temporary traffic control setup proposed by the Contractor, based on their means and methods, necessary for guardrail, concrete wall cap, and stone masonry barrier reconstruction on Bridge No. N-21-001 and for guardrail reconstruction on Bridge No. N-21-017.

The Contractor is responsible for ensuring that the work zone remains safe to roadway traffic during the time that the existing approach railing is removed until the proposed approach railing has been installed. At all times, the bridges shall remain passable to emergency vehicle traffic and at no time shall the travel way fall outside of MASH TL-2 protection.

All signs, temporary traffic control devices, and temporary traffic control setups shall conform to the most up to date provisions of the MUTCD and MassDOT standard temporary traffic control details. Under the proposed scope of work the use of detours for temporary traffic control shall not be acceptable.

The work shall include furnishing, installing, positioning, repositioning, and maintaining various temporary arrow boards, portable changeable message signs, temporary traffic control devices and procedures for each stage of work proposed by the Contractor’s means and methods in compliance with the specifications and as directed by the Engineer.

COMPENSATION

Temporary Traffic Control for Guardrail Reconstruction will be measured for payment by the Lump Sum, complete in place.

Temporary Traffic Control for Guardrail Reconstruction will be paid for at the Contract unit price per Lump Sum, which price shall include all submittals, labor, materials, equipment and incidental costs required to complete the work.

ITEM 905.01 4000 PSI, 3/8 IN, 660 CEMENT CONCRETE CUBIC FOOT

This item shall conform to the relevant provisions of Subsection 901 of the Standard Specifications and the following:

The work shall include the placement of concrete for proposed wingwall caps at Bridge No. N-21- 001 (1CW), as shown on the plans. Removal of the existing concrete caps shall be measured for payment under Item 127.12 Reinforced Concrete Excavation.

The work shall also include the removal of loose/unsound concrete, sawcutting and placement of cement concrete as indicated on the plans as spall repairs. Areas were generally shown on the plans, but shall be established in the field and approved by the Engineer. Repair areas shall be rectangular in shape as practically possible. The Contractor shall remove existing concrete, as necessary to make the repairs and shall be considered incidental to this Item.

The Contractor shall obtain the prior approval of the Engineer that existing concrete has been removed to the required depth and limits and that adequate surface preparation has been achieved before any concrete is placed. All formwork required shall be considered incidental to this Item.

All edges shall be sawcut to a minimum of 1 inch deep as part of the concrete removal work. Re-entrant corners shall not be allowed. Partial depth concrete excavation, if performed by electric or pneumatic hammer, shall weigh not in excess of thirty five (35) pounds and shall be approved by the Engineer in advance. #4 hooked and straight dowels (epoxy coated) shall be drilled into existing concrete as specified on the plans and grouted in place prior to filling the patch area. The depth of patch shall accommodate a 1 inch minimum clearance between the surface of remaining concrete and reinforcement hook and/or existing reinforcement. Welded wire fabric (4”x4”, W4xW4) shall be securely installed 2 inches clear of the exposed concrete surface prior to filling the patch area. Welded wire fabric used for spall repairs, shall considered incidental to this Item.

Epoxy bonding compound shall be applied to the concrete, immediately prior to placing the concrete and shall be considered incidental to this Item. The bonding compound shall be applied to this clean surface by spray or by brushing, using brushes of a size and/or design that will reach the underlying concrete surface. The manner of mixing, the rate of application, and the allowable open or contact time, before placing the concrete, shall be in accordance with the recommendations of the bonding compound manufacturer. If the concrete is not placed against the bonding compound within the allowable open time, the Contractor shall follow the manufacturer’s recommendations for re-application of bonding compound. Epoxy bonding compound shall be a multi-component, 100% solids, moisture insensitive, epoxy-resin system that shall be used as a bonding adhesive to bond fresh plastic concrete to sound, hardened concrete. Epoxy bonding compound shall be applied in accordance with manufacturer’s recommendations and shall conform to the requirements of the Standard Specifications Section M4.05.5. Products to be used for epoxy bonding compound shall be approved by the Engineer before the Contractor begins his operations and shall be listed on MassDOT’s Qualified Construction Materials List (QCML). The surface of old concrete shall be thoroughly cleaned by abrasive blasting to remove all loose particles, dust and other films. Care shall be taken in the Beam 10 north abutment bridge seat location, as to not remove concrete that could completely undermine the beam. Surface preparation for bonding new concrete to existing concrete shall include thoroughly cleaning, roughening and pre-wet the surface with clean water to saturated surface dry (SSD).

ITEM 905.01 (Continued)

All patches shall be formed such that new concrete will be smooth, flush and of a similar surface finish with the surrounding existing surface when the concrete has cured.

All reinforcing steel, encountered in the structure, shall be thoroughly cleaned and painted with a zinc-rich epoxy primer conforming to the Standard Specifications Section M7.02 before it is covered with new concrete and shall be considered incidental to this Item. Any steel damaged or otherwise made unsatisfactory by the contractors operations shall be replaced at the contractor’s expense. Any reinforcing with 25% or more section loss shall be supplemented and considered incidental to this Item.

All exposed structural steel beams shall be cleaned and painted per the relevant provisions of Section 961 of the Standard Specifications and shall be considered incidental to this Item.

4000 PSI, 3/8 IN., 660 Cement Concrete shall be mixed and placed in accordance with the relevant provisions of Section 901 of the Standard Specifications. The concrete shall be pumped or hand trowelled into the repair. Vibrators shall be of an approved design and shall be internal mechanical vibrators of a size suitable to the work at hand.

COMPENSATION

4000 PSI, 3/8 IN., 660 Cement Concrete will be measured for payment by the cubic foot, complete in place.

4000 PSI, 3/8 IN., 660 Cement Concrete will be paid for at the Contract unit price per cubic foot, which price shall include all labor, materials, equipment and incidental costs required to complete the work.

ITEM 905.02 4000 PSI, 3/8 IN, 660 CEMENT POUNDS

CONCRETE - UNDERWATER

This item shall conform to the relevant provisions of Subsection 901 of the Standard Specifications and the following:

GENERAL

Underwater concrete in Item 905.02 shall be placed by the pumping tremie process.

The Contractor shall submit to the Engineer a plan showing all the details of the tremie equipment, placement and procedure for approval.

No underwater placement shall be made until all concrete materials and the Contractor's placement plan have been approved.

Item 905.02 is included as a contingency for Bridge N-21-016 if, during the time of construction, repair limits necessary as shown on the plans, need to be performed underwater. The Contractor shall be responsible for performing their own site investigation regarding the water level of Linwood Pond prior to submitting their bid.

MATERIALS

All materials for underwater concrete shall meet the requirements for materials for Concrete Placed in Dry as specified in Subsection 901 of the Standard Specifications. The following additional requirements shall also apply:

Cement: Cement shall be Portland Cement Types I or II conforming to AASHTO Designation M85.

Fine Aggregate: Fine aggregate shall conform to the requirements of Section M.4.02.02 of the Standard Specifications.

Coarse Aggregate: Coarse aggregate shall consist of 3/8 inch maximum size screened gravel and shall conform to the requirements of Section M4.02.02 of the Standard Specifications.

CONCRETE PROPORTIONS

The contractor shall be responsible for the mix design, which shall be submitted to the Engineer prior to placement. The Contractor shall also have the ability to adjust the mix design in the field, if submitted mix design will not achieve flow ability to reach areas of undermining or self leveling requirements due to field conditions at time of placement.

The following weights and volumes are recommendations for proposed concrete materials for one

(1) cubic yard:

ITEM 905.02 (Continued)

ITEM WEIGHT (LBS.) VOLUME (CU FT.)

Cement 660 3.35 Coarse Aggregate 1520 9.19 Fine Aggregate 1244 7.52 Water 317 5.08 Air Entrained NA 6% + -1% 27.00 cu ft Slump 6 inches

PLACEMENT EQUIPMENT

The Contractor shall determine the diameter of tremie pipe that will match the capacity of the pump and will provide an uninterrupted flow of the tremie concrete.

A hopper or a funnel of an adequate capacity shall be provided on top of the concrete pump to facilitate transfer of an uninterrupted flow of concrete to the tremie pipes.

PLACEMENT PROCEDURE

The Contractor shall develop a comprehensive placement procedure plan in accordance with the provisions of this specification. This plan shall be submitted to the Engineer for approval at least 14 days prior to the beginning of concrete placement.

Placement shall continue uninterrupted until the scour hole(s) is completely filled. Interruption of placement through a single tremie pipe shall not exceed 30 minutes without removal of the pipe or installing a new pipe and carrying out the restarting procedure.

The discharge end of the tremie pipe shall remain embedded in the fresh concrete at all times unless the tremie pipe is being completely removed from the water. At no time shall concrete be allowed to fall through water.

Concrete to be placed underwater shall have a minimum temperature of 40 degrees F.

INSPECTION

The Contractor shall develop an inspection plan covering locations and methods of taking soundings during placement and post-placement inspection.

ITEM 905.02 (Continued)

COMPENSATION

Item 905.02 shall be measured by the pound and shall be the actual and verified weight, complete in place and approved. The quantity shall be determined only by weight slips that have been properly countersigned by the Engineer at the time of delivery.

Item 905.02 will be paid for at the contract unit price per pound, complete in place. The contract unit price shall constitute full compensation for satisfactory performance and completion of the entire work for this item as noted on the plans and included in these Special Provisions.

ITEM 908. CEMENT FOR POINTING BAG

The work to be done under this item shall consist of cleaning and pointing the existing stone masonry for the traffic side of the North spandrel wall, traffic side of the South spandrel wall and exterior of the South and North spandrel walls near keystone areas for Bridge No. N-21-001 (1CW), as shown on the plans or as directed by the Engineer.

CONSTRUCTION

Joints shall be prepared for pointing by removing all unsound mortar from the joints along with all dirt, dust, laitance, grease and other foreign matter prior to installing the pointing mortar. Joints shall be thoroughly wetted with clean water and subsequently filled with mortar. The mortar shall be driven as far as practicable into the joints. Mortar joints shall be tooled with a profile to match the profile of the mortar joints currently existing. Stone masonry must remain damp while pointing is being done. In hot weather, the pointed masonry shall be protected from the sun and kept damp for a period of at least 3 days after completion.

The mortar for the masonry shall be composed of one part cement and two parts fine aggregate by volume with sufficient water to make the mortar of such consistency that it can be handled easily and spread with a trowel. Mortar shall be mixed only in those quantities required for immediate use. Mortar not used within 45 minutes after water has been added shall be discarded. Re-tempering of mortar shall not be permitted.

The face of the stone walls shall be thoroughly cleaned of existing mortar stains and shall be kept clean until the work is completed. After the pointing is completed and the mortar set, the walls shall be thoroughly cleaned. Pointing shall not be performed in freezing weather or when the stones contain frost. All work damaged by the cold shall be removed and replaced at the expense of the Contractor.

MATERIALS

Cement for pointing shall consist of Cement Mortar meeting the requirements of Section M4.02.15 of the Standard Specifications. Portland cement shall be Type II or IIA.

COMPENSATION

Cement for Pointing shall be paid for at the Contract unit price per Bag, which price shall include all labor, materials, equipment and incidental costs required to complete the work.

ITEM 909.2 CEMENTITIOUS MORTAR FOR PATCHING SQUARE FOOT

The work under this item shall conform to the relevant provisions of Subsections 140 and 901 of the Standard Specifications and the following:

The work shall include the removal of loose/unsound concrete and placement of cementitious mortar patch as called out on the plans or as directed by the Engineer.

This item does not include the repair of any horizontal or vertical spalls which exceed 2 inches in depth. For deteriorated areas exceeding 2 inches in depth the Contractor shall excavate these areas in accordance with Item 127.12 “Reinforced Concrete Excavation” and repair these areas as shown on the Plans with Item 905.01 “4000 PSI – 3/8” – 660 Cement Concrete”. The means and methods for performing such repairs shall be considered as incidental to Item 905.01.

The Contractor will perform their own investigations and will “evaluate” and mark out repair areas.

Before any repairs are made, the Contractor will provide the Engineer clear access to the areas designated for repair. During this time, the Engineer will perform an inspection of the areas and will approve and/or designate the areas where repair will be required. It shall be the responsibility of the Contractor to inform the Engineer, in writing, of the date that a structure(s) will be available for inspection operations. Notification shall be given to the Engineer at least seven (7) days prior to the date that the area in question will be in a condition acceptable to the Engineer.

The Contractor will not be allowed to do any repair work until all necessary inspection operations have been performed, unless given permission by the Engineer. The Contractor will include any costs related to this inspection in the general cost of the work.

The Contractor shall furnish to the Engineer samples of materials proposed for use at least six weeks prior to scheduled use.

MATERIAL

The cementitious mortar material used to repair/patch concrete surfaces for this Item shall be a polymer-modified, cementitious, 2-component, fast-setting, trowel grade patching mortar to patch vertical surfaces. The materials shall be delivered to the site clearly marked with legible and intact labels containing the manufacturer’s name, brand name, and identifications of the temperatures that conform to the manufacturer’s recommendations and instructions.

All materials for patching shall be from MassDOT’s Qualified Construction Materials List

(QCML).

CONSTRUCTION METHODS

Prior to the placement of the patch material, the concrete shall receive a coating of epoxy bonding compound conforming to M4.05.5 – Type V, and as listed on the MassDOT Qualified Construction Materials List. The grade and viscosity of the bonding compound shall be as required based on site conditions or as determined by the Engineer. Fill the patch area with mortar and finish the patch area as required in maximum 1” lifts. All materials removed in this repair shall become the property of the Contractor and shall be disposed of away from the work site.

The preparation, mixing, application and curing of the cementitious mortar shall be in accordance with the manufacturer’s recommendations.

ITEM 909.2 (Continued)

The Contractor shall arrange with the material’s manufacturer or distributor to have services of a competent field representative at the work site prior to any mixing of components to instruct the work crews in the proper mixing and application procedures. The field representative shall remain at the job site after work commences and continue to instruct until the representative and the Contractor, Inspector and/or Engineer are satisfied that the crew has mastered the technique of installing the system successfully. The representative shall make periodic visits to the project as the work progresses and shall confer on each visit with the Contractor, Inspector and/or Engineer.

The manufacturer's field representative must be fully qualified to instruct the field crews in performance of the work and shall be subject to the approval of the Engineer. The Contractor shall be responsible for the expense of the services of the required field representative and the bid contract price shall be full compensation for all costs in connection therewith.

COMPENSATION

Cementitious Mortar for Patching will be measured for payment by the square foot of repair, complete in place, regardless of depth.

Cementitious Mortar for Patching will be paid for at the Contract unit price per square foot, which price shall include all labor, materials, equipment and incidental costs required to complete the work including the excavation and removal of unsound concrete.

ITEM 909.22 CEMENTITIOUS MORTAR FOR CUBIC FOOT

PATCHING - UNDERWATER

The work under this item shall conform to the relevant provisions of Subsection 901 of the Standard Specifications and the following:

The work shall include placement of underwater cementitious mortar patch as called out on the plans or as directed by the Engineer. All surfaces to be patched shall have all loose, delaminated concrete, oil, laitance and other contaminants removed.

MATERIAL

The cementitious mortar material used to repair/patch concrete surfaces for this Item shall be a pre-packaged cement – based mortar suitable for hand placement underwater requiring only the addition of potable water. The Contractor shall submit the selected material to the Engineer for approval. The material shall not contain any chlorides or lime other than amounts contained with the hydraulic cement composition.

CONSTRUCTION METHODS

The preparation, mixing, application and curing of the cementitious mortar shall be in accordance with the manufacturer’s recommendations.

The Contractor shall arrange with the material’s manufacturer or distributor to have services of a competent field representative at the work site prior to any mixing of components to instruct the work crews in the proper mixing and application procedures. The field representative shall remain at the job site after work commences and continue to instruct until the representative and the Contractor, Inspector and/or Engineer are satisfied that the crew has mastered the technique of installing the system successfully. The representative shall make periodic visits to the project as the work progresses and shall confer on each visit with the Contractor, Inspector and/or Engineer.

The manufacturer's field representative must be fully qualified to instruct the field crews in performance of the work and shall be subject to the approval of the Engineer. The Contractor shall be responsible for the expense of the services of the required field representative and the bid contract price shall be full compensation for all costs in connection therewith.

COMPENSATION

Cementitious Mortar for Patching – Underwater will be measured for payment by the cubic foot of repair, complete in place.

Cementitious Mortar for Patching – Underwater will be paid for at the Contract unit price per cubic foot, which price shall include all labor, materials, equipment and incidental costs required to complete the work including the excavation and removal of unsound concrete.

ITEM 909.31 NON-SHRINK GROUT CUBIC FOOT

Work under this Item shall conform to the applicable provisions of Subsection 901 of the Standard Specifications and specific requirements stipulated below for component parts of the subject Item.

For those component parts where no specific requirement is stipulated, the Standard Specifications shall apply.

Work under this Item shall include all materials, equipment and labor needed to construct the following:

Leveling pad along existing Northeast and Southwest wingwalls, Bridge N-21-001 (1CW) Void in South Abutment bridge seat adjacent to Beam 10, Bridge N-21-016 (1D1)

The Non-Shrink Grout shall be from the MassDOT Qualified Construction Materials List and conform to the following ASTM Standards:

1. ASTM C 1107 – Standard Specifications for Packaged Dry, Hydraulic-Cement Grout (nonshrink)

2. ASTM C 109 – Specifications for non-shrink grout

3. ASTM C 266 – Standard Test for Compressive Strength of Hydraulic Cement Mortars

4. ASTM C 232 – Standard Method for Test for Bleeding of Concrete

5. ASTM C 157 – Standard Test Method for Length Change of Hardened Hydraulic-Cement

Mortar and Concrete

The grout selected for the leveling pad along the exisiting wingwalls of Bridge N-21-001 (1CW) shall have a flowable or fluid viscosity and will contain no stone aggregate. The Contractor shall shall take precautions to ensure that all grout is contained within the formwork and does not spill down the existing stone masonry wingwall or into the Blackstone River. Installation of the grout leveling pads shall be performed based on manufacturer recommendations, and as approved by the Engineer. A grout placement procedure shall be submitted to the Engineer for approval prior to any work being performed in the field.

The grout selected to fill the void in the abutment at Bridge N-21-016 (1D1) shall have a flowable or fluid viscosity and will contain no stone aggregate. The grout shall be injected into the void thru a tremie grout tube and placed with minimal pressure. The Contractor shall take precautions to ensure no excess grout or water is discharged into the pond and is contained within the work area.

COMPENSATION

Non-Shrink Grout will be measured for payment by the cubic foot, complete in place.

Non-Shrink Grout will be paid for at the Contract unit price per cubic foot, which price shall include all labor, materials, equipment and incidental costs required to complete the work.

ITEM 912.4 DRILLED AND GROUTED #4 DOWELS EACH

ITEM 912.6 DRILLED AND GROUTED #6 DOWELS EACH

The work to be done under Item 912.4, Drilled and Grouted #4 Dowels and Item 912.6, Drilled and Grouted #6 Dowels shall consist of drilling and grouting holes, as shown on the plans, in the existing abutment, stone masonry barrier, and wingwalls for Bridge Nos. N-21-001 (1CW) and N- 21-016 (1D1). The embedment length, the method and equipment used to drill the holes, and the diameter of the drill hole shall at a minimum conform to the recommendations of the manufacturer, as shown on the plans and be submitted to the Engineer for approval.

#4 dowels are required to secure the proposed repairs and maintain a positive connection to the existing concrete to remain, as shown on the plans for Bridge N-21-016 (1D1). Additionally, #4 dowels are required to secure the proposed capstone to the existing stone masonry barrier and #6 dowels are required to secure the proposed concrete cap to the existing stone masonry wingwall, as shown on the plans for Bridge N-21-001 (1CW). Approximate drill hole diameter and embedment depth are listed on the plans and shall be adjusted in accordance with the following:

MATERIALS

The grout to be used for these dowels shall be from the MassDOT Qualified Construction Materials List. Epoxy, vinyl, or polyester resin adhesives shall not be utilized except in accordance with MassDOT Engineering Directive E-10-001.

Reinforcing steel dowels shall meet the requirements of AASHTO M31 Grade 60 and be epoxy coated. Reinforcing steel dowels shall be incidental to the work under this Item.

CONSTRUCTION METHODS

All dowel holes into existing concrete or stone masonry substructures shall be drilled with a diamond tipped bit. Impact and percussion type drills will require prior approval of the Engineer.

The inner surfaces of the dowel holes shall be scored to develop sufficient keying action. The method of scoring of the dowel hole’s inner surfaces shall be subject to the approval of Engineer.

Holes shall be blown clear of any debris and must have the approval of the Engineer prior to the placement of any grout material.

The drilling operation shall be performed without damage to any portion of the existing structure that is to remain in place.