Invitation for Bids (IFB)

SS 2027 PW3 PW4

For

Public Works Services and Materials

Specifications

Metropolitan Area Planning Council (MAPC)

On behalf of the South Shore Regional Services Consortium

Representing the following municipalities:

Braintree, Cohasset, Duxbury, Hanover, Hingham, Hull, Marshfield, Milton, Norwell, Pembroke, Rockland, and Scituate

Table of Contents General Specifications

Item 4 Roadway Surface Sealing Treatments

Item 8 Street Sweeping

General Specifications Unless otherwise noted in these specifications, all materials and work under any resulting contract or contracts shall be in conformance with the latest Editions of:

• MassDOT Standard Specifications for Highways and Bridges, Supplemental Specifications, and Standard

Special Provisions

• MassDOT Construction and Traffic Standard Details

• U.S. Department of Transportation Manual on Uniform Traffic Control Devices (MUTCD)

• MassDOT Wheel Chair Ramp Standard

• The American Water Works Association’s Standard for the Installation of Ductile-Iron Water Mains and

Their Appurtenances

• MassDOT Standard Drawings for Signs and Support

Item 4 Roadway Surface Sealing Treatments

A. MICRO-SURFACING

Scope of Work

This specification is for the micro-surfacing of various roads in the participating Member municipalities. It includes the rut filling, surface course, leveling and surface course, and crack sealing of the road that encompasses the micro-surfacing of the road. All micro-surfacing shall conform to these specifications.

General Information

Micro-Surfacing is a tough and durable thin overlay material which can restore the original service properties to worn but structurally sound pavements. Its properties are based on a blend of select crushed aggregate and a sophisticated chemical formulation of asphalt cement, cationic emulsifiers, adhesives, and latex. This specification covers all materials, equipment, construction and application procedures for rut filling and/or surfacing of existing paved surfaces. The micro-surfacing shall be a mixture of cationic latex modified asphalt emulsion, mineral aggregate, mineral and field control additives, and water, properly proportioned, mixed and spread on the paved surface in accordance with this specification and as directed by the Engineer.

Materials

Emulsified Asphalt

The emulsified asphalt shall be a quick-set latex modified cationic type CSS-lH emulsion and shall conform to the requirements specified in ASHTO M208 and ASTM 2397. It shall pass all applicable storage and settlement tests. The latex shall be milled into the emulsion. The cement mixing test shall be waived for this emulsion.

Special Residue Properties

Distillation of residue will be at a temperature of 350 degrees F. for twenty (20) minutes. Softening point of the residue shall be l40 degrees F. minimum. Viscosity, absolute at l40 F. shall be 8,000 poise minimum.

Aggregate

The mineral aggregate used shall be of the type and grade specified for micro-surfacing. The aggregate shall be manufactured crushed stone such as granite, slag, limestone, chat, or other high quality aggregate or combination thereof.

Aggregate Physical Requirements

Grading: The aggregate including natural fines when tested by AASHTO methods TII or T27, or ASTM

Cll7 or Cl36, should meet the referenced gradation requirements.

Deleterious Substances

To limit the permissible amount of clay like fines in an aggregate, a sand equivalent value of sixty-five

(65) or higher is required when tested by ASTM 24l9.

Soundness

The aggregate shall have a weighted loss of not more than fifteen percent (l5%) when the sodium sulfate test is used or twenty percent (20%) when the magnesium sulfate test is used.

Hardness:

The aggregate wear, from resistance to abrasion, shall be a maximum of thirty-five percent (35%) when using AASHTO T96 or ASTM Cl3l test methods.

Water

The water shall be potable and shall be free of harmful soluble salts.

Modifier

Special quick-setting emulsifier agents shall be milled into the asphalt emulsion. The emulsified asphalt shall be so formulated that when the paving mixture is applied at thickness of one (l) inch with the relative humidity at not more than fifty percent (50%) and the ambient air temperature of at least seventy-five (75) degrees F. the material will cure sufficiently so that rolling traffic can be allowed in one (l) hour with no damage to the surface, as verified by the Town.

Additives

A mineral additive shall be introduced to the mineral aggregate and may be any recognized brand of non-air-entrained Portland cement of hydrated lime that is free of lumps, or other approved mineral additive. It may be accepted upon visual inspection. The amount of mineral additive needed shall be determined by the laboratory mix design and will be considered as part of the material gradation requirement. A liquid field control additive is introduced and blended with water to provide effective control of the required quick-set properties. This additive shall be made available by the chemical supplier or emulsion manufacturer and certifiable as being compatible with the mixture.

Engineering

Before work commences, the Contractor shall submit a signed mix design covering the specific material to be used on the project. This design shall be performed by a qualified laboratory. Once the materials are approved, no substitution will be permitted unless first tested and approved by the laboratory preparing the mix design.

Mix Design

The qualified laboratory shall develop the job mix design and present certified test results for the

Contractor's approval. Compatibility of the aggregate and Ralumac emulsion shall be verified by the mix design. The job mix formula shall provide a minimum Marshall stability of l,800 pounds and a flow of six (6) to sixteen (l6) units when tested according to the ASTM l559 or AASHTO 245 procedure as modified. All component materials used in the mix design shall be representative of the material proposed by the Contractor for use on the project.

The Engineer shall approve the design mix and all micro-surfacing materials and methods prior to use. The component materials shall be within the following limits:

Residual Asphalt 5% to 9% by dry weight of aggregate

Mineral Additive 0.5% to 3% by dry weight of aggregate

Latex Modifier As required to provide specified properties

Field Control As required to provide specified properties

Additive Water As required to produce consistency

Aggregate - Recommended Gradations:

Screen Size Type II % Passing Type III % Passing

3/8" l00 l00

#4 90 - l00 70 - 90

#8 65 - 90 45 - 65

#l6 40 - 65 30 - 50

#30 25 - 45 19 - 34

#50 l5 - 30 l2 - 25

#l00 l0 - 2l 7 - l8

@200 5 - l3 4 - l2

Suggested Application & Rate:

Type II - Urban and Residential

Sts.

l8-22 lbs. per sq. yd

Type III - Primary and Interstate

Routes

25-30 lbs. per sq. yd.

Wheel Ruts Application rates as required

Equipment

All equipment, tools, and machines used in the performance of this work shall be maintained in satisfactory working condition at all times to ensure a high quality product.

Mixing Equipment

The material shall be mixed by a self-propelled micro-surfacing mixing machine which shall be a continuous flow mixing unit able to accurately deliver and proportion the aggregate, emulsified asphalt, mineral and field control additives, and water to a revolving multi-blade twin shafted mixer and discharge the mixed product on a continuous flow basis. The machine shall have sufficient storage capacity for aggregate, emulsified asphalt, mineral and field control additives, and water to maintain an adequate supply to the proportioning controls. The machine may be equipped with self-loading devices which provide for the loading of materials while continuing to lay micro-surfacing, thereby minimizing construction joints.

Proportioning Devices

Individual volume or weight controls for proportioning each material to be added to the mix, i.e., aggregate, emulsified asphalt, mineral and field control additives, and water shall be provided and properly marked. These proportioning devices are usually revolution counters or similar devices and are used in material calibration and determining the materials output at any time.

Emulsion Pump

The emulsion pump shall be a heated positive displacement type.

Spreading Equipment

The surfacing mixture shall be spread uniformly by means of a mechanical type spreader box attached to the mixer, equipped with paddles to agitate and spread the materials throughout the box. A front seal shall be provided to insure no loss of the mixture at the road contact point. The rear seal shall act as final strike off and shall be adjustable. The mixture shall be spread to fill cracks and minor surface irregularities and leave a uniform skid resistant application of material on the surface. The spreader box and rear strike off shall be so designed and operated that a uniform consistency is achieved to produce a free flow of materials to the rear strike off. The longitudinal joint where two passes join shall be neat appearing, uniform and lapped. All excess materials shall be removed from the job site prior to opening the road. The spreader box shall have suitable means provided to side shift the box to compensate for variations in pavement width and longitudinal alignment. A Rut Box shall be available to pre-fill wheel ruts when necessary prior to overlay to eliminate puddles or runoff interruption. The box shall be readily adjustable from 4' -6' width with hydraulically adjusted strike off screeds to attain maximum grade and profile.

Auxiliary Equipment

Suitable surface cleaning equipment, traffic control equipment, hand tools and any support equipment shall be provided as necessary to perform the work.

Machine Calibration

Each mixing unit to be used in performance of the work shall be calibrated in the presence of the

Engineer prior to construction, or previous calibration documentation covering the exact materials to be used may be acceptable provided they were made during that calendar year. The documentation shall include the individual calibration of each materials at various settings, which can be related to the machine metering devices.

Weather Limitations

The material shall be spread only when the road surface and atmospheric temperatures are at least forty-five (45) degrees F. and rising and the weather is not rainy and there is no forecast of temperatures below thirty-two (32) degrees F. within forty-eight (48) hours from the time of placement of the mixture.

Notification and Traffic Control

Notification

All homeowners and businesses affected by the construction shall be notified one (l) day in advance of the surfacing. This notification shall be in the form of a written posting stating the times and dates that construction is expected on their road.

Traffic Control/Safety Signage

a. Only traffic controls/safety signage specifically requested by the Town and erected on site will be paid for under this item.

b. Traffic controls/safety signage used by the contractor for his own convenience, such as those placed out and removed on a daily basis, will be considered incidental to the work and shall not be included for payment under this item.

Surface Preparation

The area to be surfaced shall be thoroughly cleaned of vegetation, loose aggregate and soil, particularly soil that is bound to the surface. Manholes, valve boxes and other service entrances will be protected from the surfacing material.

Cracks in Surface

It is required that the successful bidder, in the application of a leveling course and surface course, must pretreat the cracks in the surface with a fiber crack sealer prior to the application of the micro-surfacing. The crack sealer must comply with the attached specifications. The crack sealer is not required when applying a surface course only or in the alternate bid.

Tack Coat

If required by the plans, the Contractor shall apply a tack coat consisting of one part emulsified asphalt and three parts water with a distributor at .l0 - .l5 gallons per square yard. This emulsified asphalt should be the CSSlH emulsion grade. It is recommended that a tack coat always be applied to a concrete or brick surface.

Stockpiles

Precautions shall be taken to insure that stockpiles do no become contaminated. The mineral aggregate shall be screened prior to being weighed for job site delivery. This weight shall be done by means of a scale approved by the Engineer.

Application

The surface should be pre-wetted by fogging ahead of the spreader box when required by local conditions. The rate of application of the fog spray shall be adjusted during the day to suit temperatures, surface texture, humidity, and dryness of the pavement surface.

The micro-surfacing mixture shall be of the desired consistency upon leaving the mixer and no additional materials should be added. A sufficient amount of material shall be carried in all parts of the spreader at all times so that a complete coverage is obtained. Overloading of the spreader shall be avoided. No lumping, balling, or unmixed aggregate shall be permitted.

No streaks, such as those caused by oversized aggregate, will be left in the finished surface. If excessive oversize develops, the job will be stopped until the Contractor proves to the Engineer that the situation has been corrected.

Joints

No excessive buildup, uncovered areas or unsightly appearances shall be permitted on longitudinal or transverse joints. The Contractor shall provide suitable width spreading equipment to produce a minimum number of longitudinal joints throughout the project. When possible, longitudinal joints shall be placed on lane lines. Half passes and odd widths passes will be used only in minimum amounts. If half passes are used, they shall not be the last pass of any paved area.

Mix Stability

The micro-surfacing mixture shall possess sufficient stability so that premature breaking of the material in the spreader box does not occur. The mixture shall be homogeneous during and following mixing and spreading. It shall be free of excess water or emulsion and free of segregation of the emulsion and aggregate fines from the coarser aggregate.

Areas which cannot be reached with the mixing machine shall be surfaced using hand squeegees to provide complete and uniform coverage. The area to be hand-worked shall be lightly dampened prior to mix placement. Care shall be exercised to leave no unsightly appearance from handwork.

The same type finish as applied by the spreader box shall be required. Handwork shall be completed at the time of the machine applying process.

Lines

Care shall be taken to insure straight lines along curbs and shoulders. No runoff on these areas will be permitted. Lines at intersections will be kept straight to provide a good appearance.

Rolling

If required by the plans, specified areas shall be rolled by a self-propelled ten (l0) ton pneumatic roller with a tire pressure of fifty (50) PSI and equipped with a water spray system.

Quality Control

Materials

The Contractor will permit the Engineer to take samples of the aggregate and asphalt emulsion to be used in the project at the Engineer's discretion. Gradation and sand equivalent tests may be run on the aggregate and residual asphalt content test on the emulsion. Test results will be compared to specifications. Tests will be run by a qualified laboratory at the expense of the buyer. The buyer must notify the contractor immediately if any test fails to meet the specifications.

Micro-Surfacing Mixture

Samples of the mixture should be taken daily and may be taken directly from the mixing unit(s).

Consistency and residual asphalt content tests may be made on the samples and compared to the specifications. Test will be run by a qualified laboratory at the expense of the buyer. The buyer must notify the Contractor immediately if any test fails to meet specifications.

The Engineer may use the recorders and measuring facilities of the unit to determine application rates, asphalt emulsion content, mineral and field control additives, and water.

Non-Compliance

If any two (2) successive tests fail on the stockpile material, the job shall be stopped. It is the responsibility of the Contractor at his own expense, to prove to the Engineer that the conditions have been corrected. If any two (2) successive tests on the mix from the same machine fail, the use of the machine shall be suspended. It will be the responsibility of the Contractor, at his own expense, to prove to the Engineer that the problems have been corrected and that the machine is working properly.

Performance

It is the intention of this Public Agency not to award a contract for Micro-Surfacing work under this or any other proposal if the bidder cannot furnish satisfactory evidence that he has the ability and experience to perform this class of work and that he has sufficient capital and equipment to enable him to prosecute the work successfully and to complete it within the time named in the contract.

Performance Warranty

The Contractor must furnish the following warranty after completion of the work and prior to final payment.

The Contractor hereby warrants that all workmanship and all materials furnished under the Contract comply fully with requirements of these Micro-Surfacing Specifications. If at any time within two (2) years after the date of the final inspection, any unfaithful or defective work should appear, which in the opinion of the Buyer is due to inferior materials or workmanship, the Contractor warrants to do whatever is necessary to remedy the defects immediately without cost to the Buyer. The Buyer will notify the Contractor in writing of the defects and the repairs to be made, and the Contractor will begin repairs within a mutually agreed time frame.

Measurement and Payment

The quantity to be measured for payment will be the number of square yards of Micro-Surfacing actually completed. The accepted quantity of Micro-Surfacing will be paid for at the contract unit price per square yard of the type specified in the proposal, which shall be full compensation for furnishing, transporting, handling and placing the materials specified and furnishing of all labor, tools, equipment and incidentals for the satisfactory completion of this item. Rut filling will be paid by the ton of mixed material in place.

Item 8 Street Sweeping

General

a. The contractor selected must meet the minimum requirements of these specifications.

b. The term debris, as used in these specifications, shall mean all material normally picked up by a mechanical sweeper such as sand, salt, glass, paper, cans etc. It shall not include large items that would cause damage to the equipment such as tree limbs, wood, cable, large stones etc.

c. The term, street, shall mean the paved area between the normal curb lines of a roadway whether or not there is an actual curb. It does not include sidewalks, areas adjacent to the roadway or parking areas.

Scope of Work

a. The contractor will sweep streets, lots and other areas within the participating towns at the direction of, and as scheduled by, the Public Works Director. Consistent with typical sweeping schedules, the Contractor should anticipate that all Towns will require some, if not all, desired sweeping to be completed prior to Memorial Day weekend and again prior to the opening of local schools.

b. When required by the respective Directors of Public Works, the contractor will supply a sweeper within 72 hours, except in the case of emergencies when a sweeper will be supplied within 24 hours. In emergency situations, the contractor will be paid a minimum rate of four

(4) hours for all emergency or regular schedules.

c. The contractor will not be required to re-sweep areas blocked by parked cars or areas where debris has washed back onto the roadway without additional compensation.

d. Sweepings will be disposed of in one or both of the following manners at the discretion of the Towns:

1) By the Town: at a site of its choosing, transported to that location either by the Contractor or the Town.

2) By the Contractor: Basis of payment shall be per ton of material removed and disposed and shall include the furnishing of all equipment, labor and materials necessary to sweep, haul, and dispose of all materials at a licensed disposal site or other permitted processing facility.

This includes waste characterization, profiling, testing, regulatory costs disposal facility approvals

Equipment Specifications

a. Sweepers must be capable of dumping directly into dump trucks.

b. Sweepers must be equipped with functioning water spray systems for dust control.

c. All equipment must be four (4) years of age or less and will be inspected prior to award of contract. Equipment must be in good operating condition, and so maintained for the duration of the contract. The contractor shall maintain a sufficient supply of spare brooms and parts in order to insure a continuous operation.

d. The Contractor must maintain a sufficient number of sweepers properly registered, safety inspected, insured and available for deployment to meet the needs of the Towns year round.

Obligations of Towns to the Contractor

a. Towns will provide the contractor with supervised access to adequate water supply at locations proximal to the sweeping being performed.

b. The Towns will provide sufficient dump trucks for dumping debris picked up by sweepers. If a sweeper is required to wait more than twenty (20) minutes for a truck, then debris may be dumped in an area designated by the Town along that roadway. Any unauthorized dumping of debris will be removed at the contractor’s expense.

c. The Town will provide an area to park the sweeper. The Town will not assume any responsibility for damage done to the sweeper.

Obligations of the Contractor to the Towns

a. The contractor must be able to meet all requirements of these specifications. He shall submit, with his bid proposal, a list of equipment owned by him as evidence that he has the capability of meeting the requirements of these specifications.

b. The contractor must make available a vacuum truck sweeper upon the request of any of the Directors of Public Works.

c. The contractor must have a supervisor available to direct operations. This supervisor will report to the Directors of Public Works any problems as well as give daily progress reports.

d. The contractor will not sublet or assign this contract without the prior approval and authorization of each Towns awarding authority. No contractual relationship shall be created between any sub-contractor or assignee and the Towns.