3 - UPC 121556 PW Standards & Specifications.pdf

PART FIVE – DEPARTMENT OF PUBLIC WORKS STANDARDS AND SPECIFICATIONS

1. Summary of Work

Description

The work under this contract is described in the Invitation to Bid. All work shall be performed in strict accordance with the drawings and specifications and subject to the terms and conditions of the construction contract.

All work shall be performed in strict accordance with the City of Fairfax City Code, the latest editions of the Virginia Department of Transportation (VDOT) Road and Bridge Specifications, the VDOT Road and Bridge Standards, MUTCD and Virginia Work Area Protection Manual, Fairfax City and City of Fairfax Public Facilities Manual, and the specifications, terms and conditions of the construction contract.

All work covered by these specifications will be let under a single contract.

Field Utility Adjustments by Contractor The Contractor shall be responsible for adjusting all sanitary sewer manholes and water valve box tops and meters within the limits of the project to finished grade. Cost for this work shall be included in the overall cost of related work. No separate payment item is provided for this work.

Incidental Work It is the intention of the City to obtain a properly constructed project completed in its entirety. Except as otherwise specifically provided by these specifications, all items of work specified shall constitute work to be accomplished by the Contractor. Incidental work includes all minor items and shall be a part of this project. The cost of incidental work shall be included in the stated contract prices.

Availability of the Site It is the intention of the City to make available to the Contractor the entire site within the limits of the work and to impose a minimum restriction for the conduct of the work. The Contractor shall coordinate its work to ensure the minimum uninterrupted services of utilities and traffic flow.

During the progress of the work, the convenience of the public and the residents along the street must be provided as far as it can practically be maintained wherever possible. Temporary approaches to, and crossings of, intersecting streets and sidewalks must be provided and kept in goodcondition. The Contractor shall contact Miss Utility forty-eight (48) hours in advance of any excavation work.

Applicable Standards Any material, equipment or workmanship specified by reference to the number, symbol or title of any specific standard shall comply with the latest edition or revision thereof and any amendment or supplement thereto in effect on the date of the plans and specifications except as limited to type, class or grade or as modified in these specifications. All work, unless otherwise shown or specified, shall be in strict accordance with applicable portions of the latest edition or revision of the Virginia Department of Transportation Road and Bridge Specifications and the Virginia Department of Transportation Road and Bridge Standards. The Contractor shall obtain and/or review and require its subcontractors to obtain and/or review these referenced specifications and standards as they pertain to this work.

All work covered by this contract shall be in accordance with the provisions of the latest edition or revision of the "Virginia Occupational Safety and Health Standards for the Construction Industry," as adopted by the Safety and Health Commission of the Commonwealth of Virginia and issued by the Department of Labor and Industry, Richmond, Virginia.

2. Temporary Facilities

Lights, Barricades and Signs

The Contractor shall furnish and install lights, barricades and signs as may be required to protect against injury to its employees and to the public, to protect its work and to protect adjacent structures and properties. Lights, barricades and signs shall be in accordance with the requirements of the City, and applicable laws of the Commonwealth of Virginia. Barricades shall be removed upon completion of the work.

Traffic Routing The Contractor shall provide for the maintenance of vehicular and pedestrian traffic as required by the City for work insidethe City corporate limits, or by VDOT forwork outside the City corporate limits, during the period of construction in order to provide minimum interference with normal operation and traffic flow. No signs, detours, road or lane closures shall be put in place unless approved by the City or by VDOT. The minimum number of lanes to be maintained during peak hours will be as directed by the City street division superintendent or by VDOT. Street openings for the removal of existing pipe and the installation of storm sewers shall be made in accordance with the requirements of the City or VDOT. The compensation for this item shall be included in the unit price for construction items, where applicable. Construction phasing and maintenance of traffic drawings are provided in the Drawings herein. Should the Contractor wish to provide alternative phasing and traffic control, Contractor shall submit such plans for approval at least 2 weeks prior to intended use.

Miscellaneous Contractor shall provide toilet facilities and drinking and washing water for its employees in a location to be approved by the City.

For any work in the right-of-way, within the City’s corporate limits, the police department must be notified each working day by the Contractor, (703) 385-7924 or (703) 591-5511.

Work is not permitted on Saturday, Sunday, Evenings or Holidays, except with special approval from the City. All requests for exceptions must be pre-approved by the City.

Method of Measurement and Basis of Payment Maintenance of Traffic is established as a lump sum item and will be paid for in accordance with 109.08 of the VDOT Road and Bridge Specifications. All labor, materials, equipment and other ancillary work associated with maintenance of traffic is included in the Maintenance of Traffic lump sum pay item.

3. SITE DRAINAGE AND UTILITY ADJUSTMENTS

Connect UD-1 To Drop Inlet This work consists of modification to existing drop inlets to receive new UD-1. The elevation of the drop inlet inverts shall be verified prior to installation of the UD-1 to ensure positive drainage. The work will include all materials and work necessary to the existing inlet wall to receive the underdrain pipe, following VDOT specification requirements.

Any repairs to the existing gutter due to the drop inlet modification shall also be part of this item.

Utility Adjustments The Contractor shall be responsible for adjustments of utility appurtenances (including but not limited to water valve boxes, service laterals, monitoring wells, recovery wells and sanitary sewer manhole tops) to finished grade. Water meters, monitoring wells, recovery wells, meter pits, valves and appurtenances shall not be removed, tampered with or disturbed, without the prior approval of the City and, if applicable, Fairfax Water.

Method of Measurement and Basis of Payment Connect UD-1 To Drop Inlet will be measured on an “each” basis and will be paid for at the contract price per each.

This price shall include all labor, materials, equipment and incidentals required to complete the item.

No measurement or payment shall be made for the adjustment of miscellaneous utility appurtenances.

4. ROADWAYS AND PAVEMENTS

General Comply with the requirements of the construction contract and general requirements.

Work Included Work shall include the furnishing of all labor, materials, equipment and supplies and performing all operations necessary and required for completion of the subgrade preparation, pavement structure, curbs and gutters, curbs, standard entrances, median strips, sidewalks, steps and related items as shownon the drawings and/or as specified. No construction covered by this section of the specifications shall begin until all clearing, grading, earthwork and compaction in the specific area has been completed as specified. Where new curbs and gutters, curb, sidewalks and median strips about the existing, the existing shall be saw cut. Where the new pavement abuts the existing pavement, the existing bituminous surface shall be saw cut for one and one- half (1½) feet to provide smooth joint as shown on drawing or specified. No extra payment will be made forsawcutting.

Reference Specifications All drainage structures shall conform to the Virginia Department of Transportation (VDOT) standards as specified on the drawings, except as otherwise shown on the drawings or specified.

All steps, curbs and gutters, curbs and sidewalks shall conform to the latest VDOT Road and Bridge Standards, and the details shown on the drawings.

All driveway entrances shall conform to the latest City Standards or VDOT Standards, as applicable.

Subgrade Preparation The entire subgrade area, including the area under curbs and gutters and sidewalks shall be compacted to 95% of maximum density, using V.T.M.-1, as determined by AASHTO T-99. Subgrade preparation, construction and equipment shall be in accordance with applicable portions of Section 305, "Subgrade and Shoulders," of the VDOT Specifications.

After pavement removal and excavation to approximate subgrade, the subgrade material shall be proof-rolled using pneumatic-tired rollers or heavy trucks and shall be compacted using pneumatic- tired rollers or sheeps-foot rollers to 95% of maximum density as determined by AASHTO T-99. When compaction requirements cannot be met because of unsuitable or unstable material, the material shall be removed to a sufficient depth so that when backfilled with select material and compacted the specified requirements are achieved. Existing base course material excavated in preparing the subgrade may be used as select material in the subgrade, at no addition in price, if the excavated material can be compacted to the degree specified.

Completed subgrade prior to authorizing placement of the base course. If tests show unsatisfactory compaction, the City may require the Contractor, at no addition in contract price, to provide additional compaction and/or furnish additional material until the specified degree of compaction is obtained.

Method of Measurement No separate measurements for subgrade preparation will be made.

Basis of Payment For preparation of subgrade, no separate payment will be made.

Select Material Select material where required shall conform to Section 207, “Select Material," of the VDOT Specifications for Type 1, 2 or 3. Select material shall be placed and compacted as herein specified for subgrade.

Select material will be measured in units of cubic yards and will be determined by compacted measurements on the road.

Aggregate Subbase Course The aggregate subbase course material shall conform to Section 208, "Subbase and Aggregate Base Materials," of the VDOT Specification for Type 1, sizes 21, 21-A or 21-B. Materials shall be placed to the depth shown on the plans and compacted to 95% of maximum density as determined by AASHTO T-99. Methods of construction and equipment shall conform to Section 308, "Subbase Course," of the VDOT Specifications, paragraph 308.01 to 308.04.

The City, at its option and expense, may have compaction tests performed on the completed subbase course prior to authorizing placement of paving. If tests show unsatisfactory compaction, the City may require the Contractor, at no addition in contract price, to provide additional compaction and/or furnish material until the specified degree of compaction is obtained.

Measurement and Payment Aggregate subbase course will be measured in tons, as specified, and will be paid for at the contract unit price per ton.

5. Asphalt Concrete

Asphalt concrete milling shall be constructed to the depths and section as specified in the bid documents or as shown on the drawings, as applicable, and be in accordance with VDOT Specifications Section 315, “Asphalt Concrete Pavement.”

Any pavement cut during construction shall be saw cut.

Material shall conform to the applicable requirements of Section 210, "Asphalt Materials," and Section11G, "Asphalt Concrete Mixtures (SUPERPAVE)," Sections 211.01-211.15 of the VDOT Specifications.

Asphalt concrete base course shall be Type BM-25.0A. Asphalt concrete intermediate course shall be Type IM-19.0A.

Tack coat shall be Type SRS-1 or SRS-1H applied at the rate of 0.05 to 0.15 gallons per square yard (depending upon surface condition). Tack coat shall be applied in accordance with the requirements of Section 310, "Tack Coat," and Section 315, "Asphalt Concrete Pavement," of the VDOT Specifications.

Prime coat shall be Type SRS-1 applied at the rate of 0.20 gal., or current VDOT Specifications, per square yard. Prime coat shall be applied in accordance with the requirements of Section 311, "Prime Coat,” of the VDOT Road and Bridge Specifications.

Asphalt concrete surface course shall be Type SM-9.5D. Milling pavement shall be in accordance with Section 515, “Planning Pavement” of the VDOT Road and Bridge Specifications.

Construction Asphalt concrete paving shall be constructed in accordance with Section 315, "Asphalt Concrete Pavements," of the VDOT Specifications. Tack coat shall be applied ahead of the paving operation with sufficient time interval to ensure maximum adhesion of the surface course to the basecourse. This work also includes application of a stress absorbing membrane interlayer (SAMI) in accordance with the special provisions as a component of the asphalt concrete paving section.

Measurement and Payment

Asphalt concrete surface, intermediate, and base will be measured in tons and paid for at the contract unit prices per ton. This price shall include preparing and shaping the subgrade or subbase, constructing and finishing shoulders and ditches, and removing and replacing unstable subgrade or subbase, and prime and tack coat applications. Net weight information will be furnished with each load of material delivered in accordance with the requirements of Section 211 of the VDOT Road and Bridge Specifications. Milling pavement shall be measured and paid for in accordance with Section 515 of the VDOT Road and Bridge Specifications.

6. Sidewalks and CG-12 Ramps

Sidewalks shall be constructed in accordance with specifications and details shown on the drawings, as specified.

Concrete sidewalks shall be four (4) inches thick with four (4) inches of 21A aggregate base and shall be constructed in accordance with Section 504, "Sidewalks, Steps and Handrails" of the VDOT Specifications.

Brick Sidewalks shall be composed of one and five-eights (1 5/8) inches thick brick pavers on one-half (1/2) inch of mortar base, four (4) inches of concrete base, and four (4) inches of 21A aggregate base material in accordance with the construction drawings and City Standards. Where sidewalk underdrain (VDOT Standard UD-3) is proposed, the 21A aggregate material is to be substituted with four (4) inches of Aggregate Base Material Type I No. 57 as shown on plans.

CG-12 curb ramps including CG-12 detectable warning surfaces shall be constructed in accordance with Section 504, “Sidewalks, Steps, and Handrails,” of the VDOT Specifications.

Sidewalk will be measured in square yards of finished surface and type (concrete or brick). CG-12 curb ramps will be measured in square yards of finished surface.

The accepted quantities of sidewalk will be paid for at the contract unit price per square yard. The payment of the contract unit price shall be full compensation for all materials, concrete, pavers, aggregate, mortar, paver restraints and concrete nails, labor, tools and incidentals necessary to complete the items of work.

The accepted quantities of CG-12 curb ramps will be paid for at the contract price per square yard. The unit price for CG-12 curb ramps shall include excavation, backfill, aggregate base, detectable warning surface, curbing, compaction and disposal as necessary for the proper construction of these items. Unit prices shall be full compensation for all materials, labor, tools, equipment and incidentals necessary to complete the work.

7. Curb, Gutters and Combination Curb and Gutter, Paved Ditches and Flumes, and Driveway Entrance Gutters

Curbs, gutters, and combination curb and gutter, paved ditches and flumes, and entrance gutters shall be constructed with the locations and details shown on the drawings and as specified.

Curbs, Gutters and Combination Curb and Gutter,Paved Ditches and Flumes, and Entrance Gutters Cement and asphalt concrete curbs, gutters, and combination curb and gutter, paved ditches and flumes, and entrance gutters shall be constructed in accordance with Section 502, "Incidental Concrete Items," of the VDOT Specifications. Granite curb shall be constructed in accordance with the detail shown on plans.

Method of Measurement Radial/standard curbs, gutters, and combination curb and gutter, and paved ditches and flumes will be measured in linear feet. Standard driveway entrance gutter will be measured in square yards.

The accepted quantities of curb, gutter, combination curb and gutter, and paved ditches and flumes will be paid for at the contract price per linear foot. The accepted quantities of driveway entrance gutter will be paid for at the contract price per square yard. Where the curb and gutter is adjacent to curb inlets, the unit price for the inlets shall include that part of the curb and gutter within the limits of the structure. The unit price for granite, asphalt concrete, and cement concrete curb, gutter, combination curb and gutter, paved ditches and flumes, and entrance gutters shall include excavation, backfill, aggregate base, dry concrete mix (for granite curb), compaction and disposal as necessary for the proper construction of these items. Unit prices shall be full compensation for all materials, labor, tools, equipment and incidentals necessary to complete the work.

8. CONCRETE

General Comply with the requirements of the construction contract and general requirements and Virginia Department of Transportation (VDOT) design.

Work Included Work shall include the furnishing of all labor, materials, equipment and supplies and performing all operations necessary and required for completion of the concrete work as detailed on the drawings and as specified.

Materials Aggregate: Fine and course aggregate for concrete shall conform to ASTMC33.

Portland Cement: Portland cement shall conform to ASTM C150 Types I or III.

Water: Water used in mixing concrete shall be clean and free from injurious amounts of oil, acids, alkali, salts, organic materials or other substances that may be deleterious to concrete or steel.

Curing Materials: Curing materials shall be fifteen (15) pounds building paper or polyethylene sheeting of minimum four (4) millimeter thickness (Section 404.13).

Expansion Joint Material: Expansion joint material shall be pre-molded expansion joint filler, non-extruding, and bituminous type.

Forms: Wood, metal or plywood. "Removing Formwork," Section 404.03(j) or Table IV-2.

Reinforcement: Reinforcing bars shall conform to ASTM 615, grade 60 and deformed according to ASTMA305.

Welded Wire Fabric: Welded wire fabric shall conform to ASTM 185 for sizes indicated on the drawings.

Design Strength Concrete for this project shall have a minimum strength of 2,450 psi and 3,500 psi compression strength of seven

(7) and twenty-eight (28) days respectively. All concrete for this project shall be air entrained. Concrete shall be placed in accordance with ACI 615, "Recommended Practice for Measuring, Mixing and Placing Concrete."

No measurement of concrete will be made.

Basis of Payment No separate payment for concrete will be made. The cost thereof shall be included in the cost of other items of work.

Test Cylinders:

General: Test cylinders may be required by the City during the conduct of the project. The Contractor shall furnish the concrete, assist in obtaining test cylinders and field cure cylinders where required.

Field Test Cylinders: Field test cylinders shall be obtained in accordance with ASTM C172, made and cured in accordance with ASTM C31, and tested in accordance with ASTM C39. Laboratory test cylinders shall be made and cured in accordance with ASTMC192.

Tests: Tests shall be made by a qualified commercial laboratory approved by the City and paid for by the Contractor.

Rejection: The City may reject all or any part of concrete whenthe test cylinders indicate a low strength concrete. The City may elect to accept the low strength concrete. The City will be entitled to reduce the payment for that structure based on a ratio of the design strength and teststrength.

PART FIVE – DEPARTMENT OF PUBLIC WORKS STANDARDS AND SPECIFICATIONS