Technical_Specifications.pdf

City of Napa Public Works Contract Documents Form 4.1 (2023-12-22) Fire Station No. 3 Driveway Repair Project TECHNICAL SPECIFICATION City Project No. FC25FD01 Page 1

TECHNICAL SPECIFICATIONS

Part 1 – General

1.01 Order of Work

Contractor shall follow the sequence of activities as set forth herein.

(1) Permits, Fees, and City Business License. Contractor shall obtain and paid for all necessary permits required for the Work. The cost thereof will be included in the Contract price paid for Control of Work, and no additional compensation will be allowed therefor.

(2) Notice of Excavation. Contractor shall comply with all applicable requirements in

Government Code §§ 4216 et seq., which are incorporated by reference herein.

(3) Project Notification. Contractor shall notify residents and/or property owners of the upcoming Work, in accordance with the requirements in the section titled “Construction Area Signs” of the Specifications.

(4) Traffic and Pedestrian Control Plan. Contractor shall implement approved traffic control plan in accordance with the requirements in the section titled “Traffic Control” of the Specifications. The cost thereof will be included in the Contract prices paid for Traffic Control, and no additional compensation will be allowed therefor.

Part 2 – Traffic Control

2.01 Temporary Traffic Control Devices

Flagging, signs, and all other traffic control devices furnished, installed, maintained, and removed when no longer required shall conform to the provisions in Section 12, "Temporary Traffic Control," of the Standard Specifications and these Specifications.

Category 1 traffic control devices are defined as those devices that are small and lightweight (less than 45 kg) and have been in common use for many years. The devices shall be known to be crashworthy by crash testing, crash testing of similar devices, or years of demonstrable safe performance. Category 1 traffic control devices include traffic cones, plastic drums, portable delineators, and channelizes.

If requested by the Engineer, the Contractor shall provide written self-certification for crashworthiness of Category 1 traffic control devices. Self-certification shall be provided by the manufacturer or the Contractor and shall include the following: date, Federal Aid number (if applicable), expenditure authorization, district, county, route, and kilometer post of project limits;

company name of certifying vendor, street address, city, state and zip code; printed name, signature and title of certifying person; and an indication of which Category 1 traffic control devices will be used on the project. The Contractor may obtain a standard form for self-certification from the Engineer.

Category 2 traffic control devices are defined as those items that are small and lightweight (less than 45 kg), that are not expected to produce significant vehicular velocity change but may otherwise be potentially hazardous. Category 2 traffic control devices include: barricades and portable sign supports.

If requested by the Engineer, the Contractor shall provide a written list of Category 2 devices to be used on the project at least five days prior to beginning any work using the devices. For each type of device, the list shall indicate the FHWA acceptance letter number and the name of the manufacturer.

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MEASUREMENT AND PAYMENT – The Contract Lump Sum price for Traffic Control includes full compensation for providing all labor, materials, tools, equipment, and incidentals and for doing all the work involved in this section, including providing self-certification for crashworthiness of Category 1 traffic control devices and for providing a list of Category 2 devices used on the project and labeling Category 2 devices as specified, complete in place, as described in the Contract and these Special Provisions, as directed by the Engineer, and no additional compensation will be allowed therefor.

2.02 Construction Area Signs

Construction area signs shall be furnished, installed, maintained, and removed when no longer required in conformance with the provisions in the section titled, "Temporary Traffic Control," of these Specifications.

Contractor shall know and comply with the requirements of the section titled, "Prequalified and Tested Signing and Delineation Materials," of these Special Conditions. Type II retroreflective sheeting shall not be used on construction area sign panels. Sign substrates for stationary mounted construction area signs may be fabricated from fiberglass reinforced plastic as specified under "Prequalified and Tested Signing and Delineation Materials" of these Special Conditions.

Excavations required to install construction area signs shall be performed by hand methods without the use of power equipment, except that power equipment may be used if it is determined there are no utility facilities in the area of the proposed post holes.

Certain signs may be required to be covered during the progress of the work. Signs that are no longer required or that convey inaccurate information to the public shall be immediately covered, removed, or the information shall be corrected. Covers for construction area signs shall be of sufficient size and density to completely block out the complete face of the signs. The retroreflective face of the covered signs shall not be visible either during the day or at night. Covers shall be fastened securely so that the signs remain covered during inclement weather. Covers shall be replaced when they no longer cover the signs properly.

Contractor shall notify residents and property owners in writing 48 hours (excluding weekends and holidays) prior to performing any work at the site. The notification form to be provided to residents and property owners shall be submitted to the City for review and approval. Contractor shall know and comply with the requirements of the section titled “Submittals,” of these Special Conditions.

Street parking may be restricted as necessary to facilitate construction activity. “No Parking” signs, as required, shall be placed by Contractor 48 hours in advance of the parking restriction. “No Parking” signs shall have the following information:

“Tow Away, No Parking

Date of Restriction

Time of Restriction

Construction Zone

“Vehicles in Violation Subject to Tow at Owner’s Expense”

“Napa Police Department: 707-257-9223"

CVC 22658 (1); CVC 22651 (L)

“No Parking” signs shall have red letters on a white background. “No Parking” signs shall be spaced no more than 30 feet apart. The City can provide “No Parking” signs at the Contractor’s request.

Contractor will not be allowed to restrict parking in all areas of the project for the entire duration of the project to facilitate their work. The placement of “No Parking” signs shall be conducted in a manner that reasonably reflects the location of the work at any given time during the project.

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MEASUREMENT AND PAYMENT – The Contract Lump Sum price for Traffic Control includes full compensation for providing all labor, materials, tools, equipment, and incidentals and for doing all the work involved in this section, complete in place, as described in the Contract and these Special Provisions, as directed by the Engineer, and no additional compensation will be allowed therefor.

2.03 Maintaining Traffic

Contractor shall know and comply with the requirements of Sections 7-1.03, "Public Convenience," and 12-4, “Maintaining Traffic,” of the Standard Specifications and these Specifications. Nothing in these Specifications will be construed as relieving the Contractor from the responsibilities specified in the Standard Specifications.

Contractor shall furnish and erect Standard W20-1 “Road Work Ahead” and Standard G20-2 “End Road Work” signs to provide advance warning to the traffic at the job site. W20-1 and G20-2 signs shall also be installed along all side streets entering the work area. Contractor shall submit a Traffic Control Plan that includes the exact locations of the signs.

Prior to saw cutting of existing curb, gutter, sidewalk, driveway, and asphalt concrete for removal and up to the time the new improvements are opened to the public, Contractor shall erect and maintain necessary signs and barricades as required in these Specifications.

Lane closures shall conform to the provisions in the section "Traffic Control System for Lane Closure" of these Specifications. The term closure, as used herein, is defined as the closure of a traffic lane or lanes, including ramp or connector lanes, within a single traffic control system. Bicycle traffic shall be maintained per these Specifications.

No work that would require a lane closure will be performed unless otherwise authorized by the Engineer. Lane closures shall conform to the provisions in the section "Traffic Control System for Lane Closure" of these Specifications. The term closure, as used herein, is defined as the closure of a traffic lane or lanes, including ramp or connector lanes, within a single traffic control system.

Bicycle traffic shall be maintained per these Specifications.

Contractor shall provide for the safe and orderly movement of traffic at all times during construction.

On all streets, one lane in each direction shall be maintained at all times. Temporary street closures or providing only one lane for both directions may be authorized by the Engineer provided adequate circulation is maintained and/or adequate flagmen and signage satisfactory. Any lane closures shall be limited to the hours of 9:00 AM to 3:00 PM unless authorized by the Engineer.

No street closures will be allowed unless directed by the Engineer. If the Contractor desires a street closure, the Contractor shall submit a written request, accompanied with a traffic control plan, to the Engineer for review and approval. The request shall state the reason, locations, and times for the closure, and shall be submitted a minimum of five working days prior to the request.

Engineer will authorize or deny the request within three working days after the receipt of the request. If the street closure request is authorized, then the Contractor shall notify the Police and Fire Department of the City, the Division of Forestry, local ambulance services, the V.I.N.E. Bus Service, Napa Garbage Service, Napa Valley Unified School District Transportation Department, and the U.S. Post Office in writing, 48 hours in advance of all street closures and keep the Fire Department posted at all times regarding available access to the streets. Contractor shall also notify United Parcel Service (UPS), Federal Express, and other mail delivery services of planned street closures and the current schedule.

No vehicular detours will be allowed.

No street closures will be allowed overnight.

Access for emergency vehicles shall be provided at all times. Any repairs due to damage caused by emergency vehicle usage during the periods of street closure shall be paid for as extra work.

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Contractor shall furnish, install, maintain, and remove barricades, lights and signs as required, and shall provide flagmen and other facilities to safeguard adequately the general public, local pedestrian and vehicle traffic, and the work as may be deemed necessary by the Engineer during working and non-working hours.

Traffic signs, flashing lights, lighted arrow boards, barricades, temporary railings, and other traffic safety devices used to control traffic shall conform to the requirements of the section titled, “Temporary Traffic Control,” of these Specifications and the current edition of the Manual of Uniform Traffic Control Devices (including the California Supplement). Flashing lights shall be provided on each barricade. The Contractor shall inspect all safety devices at the beginning of each workday.

Contractor shall take extra care to minimize disruption to fire station operations during the progress of work. During construction, the fire engines and staff will be utilizing the driveway along Solano Avenue to enter or exit the property. Contractor shall avoid using the driveway along Solano Avenue to enter or exit the property and parking area for parking or staging. Contractor shall utilize the Trower Avenue driveway to enter and exit the property and may use the driveway leading to the parking lot for construction parking or staging.

Contractor shall file, with the Engineer and Fire Department, the name and telephone number of company representatives (provide minimum two contacts) to be notified after normal working hours and on weekends, in case of emergency. This information shall be provided at the preconstruction conference. If a preconstruction conference is not held, it shall be provided to the Engineer prior to the start of work.

Contractor shall submit, prior to or at the preconstruction conference, a Traffic Control Plan (TCP) which conforms to all requirements of the Standard Specifications, these Specifications, and the City’s Temporary Traffic Control Plan Guidelines (Appendix B). The TCP shall be prepared by a company/Contractor who is knowledgeable (trained and/or certified) in proper preparation of traffic control plans. This TCP shall include all lane closures, construction area signs, flag protection, changeable message signs, detours, and parking prohibitions. TCPs shall conform to the most current edition of the “California Manual on Uniform Traffic Control Devices”. No work will commence prior to the submittal and approval of a satisfactory traffic control plan. A TCP will not be deemed satisfactory unless it conforms to the requirements of the aforementioned manual.

More than one TCP may be required for different phases of the work, and each traffic control plan shall conform to the requirements of these Specifications and the Standard Specifications.

Contractor shall provide pedestrians with reasonably safe, convenient, and accessible paths that replicate as nearly as practical the most desirable characteristics of the existing sidewalks or footpaths. The Contractor shall submit a Pedestrian Control Plan (PCP) for the review and approval of the Engineer at the time of the submittal of the Traffic Control Plan. The PCP shall provide a safe path of travel for pedestrians within the construction site and shall provide access to the corner ramps during construction. The Contractor shall provide the appropriate safety barriers, including water barriers, required when directing pedestrians into the roadway. The PCP shall follow requirements set forth in the most recent CA MUTCD including the use of water barriers and other approved safety devices for the protection of pedestrians. Pedestrians shall not be detoured more than two (2) blocks or over weekends or holidays unless approved by the Engineer.

MEASUREMENT AND PAYMENT – The Contract Lump Sum price for Traffic Control includes full compensation for providing all labor, materials, tools, equipment, and incidentals and for doing all the work involved in this section, complete in place, as described in the Contract and these Special Provisions, as directed by the Engineer, and no additional compensation will be allowed therefor.

2.04 Lane Closure Requirements and Conditions

Lane closures, if authorized by the Engineer, shall conform to the provisions in the section titled, "Maintaining Traffic," of these Specifications.

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The term closure, as used herein, is defined as the closure of a traffic lane or lanes, including ramp or connector lanes, within a single traffic control system.

LANE CLOSURE SCHEDULE

By noon Monday, the Contractor shall submit a written schedule of planned closures accompanied by a Traffic Control Plan for the following week period, defined as Friday noon through the following Friday noon.

The Closure Schedule shall show the locations and times when the proposed closures are to be in effect. Closure Schedules submitted to the Engineer with incomplete, unintelligible, or inaccurate information will be returned for correction and resubmittal. Contractor will be notified of disapproved closures or closures that require coordination with other parties as a condition of approval.

Amendments to the Closure Schedule, including adding additional closures, shall be submitted to the Engineer, in writing, at least three working days in advance of a planned closure. Approval of amendments to the Closure Schedule will be at the discretion of the Engineer.

No lane closures will be allowed overnight.

MEASUREMENT AND PAYMENT – The Contract Lump Sum price for Traffic Control includes full compensation for providing all labor, materials, tools, equipment, and incidentals and for doing all the work involved in this section, complete in place, as described in the Contract and these Special Provisions, as directed by the Engineer, and no additional compensation will be allowed therefor.

2.05 Traffic Control System for Lane Closure

A traffic control system for lane closures, if authorized by the Engineer, will consist of closing traffic lanes and the provision of traffic detours, including but not limited to, furnishing, installing, maintaining and removal (when no longer required) of traffic control devices in accordance with the provisions of the sections titled “Prequalified and Tested Signing and Delineation Materials,” of the Special Conditions and “Maintaining Traffic” and “Construction Area Signs,” and these Specifications.

The provisions in this section will not relieve the Contractor from the responsibility to provide such additional devices or take such measures as may be necessary to comply with the provisions in the section titled “Safety Precautions and Programs,” of the General Conditions and the Special Conditions.

The adjustment provisions in Section 4-1.05, "Changes and Extra Work," of the Standard Specifications shall not apply to the item of traffic control. Adjustments in compensation for traffic control will be made on a force account basis as provided in Section 9-1.04, "Force Account," of the Standard Specifications for increased work and estimated on the same basis in the case of decreased traffic control required by changes ordered by the Engineer to pre-approved traffic control plans.

The cost of furnishing, installing, maintaining, and removing signs, sign covers, lights, flares, temporary railing, barricades, flagmen, guards, and all construction area traffic control devises will be borne by the Contractor.

MEASUREMENT AND PAYMENT – The Contract lump sum price paid for Traffic Control includes full compensation for furnishing all labor (including flagging and signs), material, tools, equipment, and incidentals, and for doing all the work involved in conforming to the provisions of this Section, including but not limited to placing, removing, storing, maintaining, moving to new locations, replacing, and disposing of the components of the traffic control system, complete in place, as described in the Contract and these Special Provisions, as directed by the Engineer, and no additional compensation will be allowed therefor.

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Part 3 – Earthwork

3.01 Dust Control

Contractor shall know and comply with the General Conditions and Special Conditions for Project Site Conditions and Maintenance and the provisions in section 1.10.02 "Water Pollution Control," of the City Standard Specifications.

Contractor shall be familiar with and comply with all monitoring, reporting, notifications, and control requirements of agencies having jurisdiction over air quality.

Contractor shall prevent the formation of an airborne dust nuisance by watering work areas as required until the project is completed and accepted. The amount of water used shall not be excessive to cause soil carry-over or wash-off outside the boundaries of the working area. If soil wash-off occurs, the Contractor shall immediately notify the Engineer and identify the area where wash-off occurred. Contractor shall provide polyethylene sheeting to place underneath and over any stockpiled soil, unless otherwise directed by the Engineer. The stockpile shall be covered daily after completion of work. The sheeting shall be adequately weighted or secured to keep the sheeting in place during non-work periods.

MEASUREMENT AND PAYMENT – The Contract lump sum price for Water Pollution Control includes full compensation for providing all labor, materials, tools, equipment, and incidentals and for doing all the work involved in this section, complete in place, as described in the Contract and these Special Provisions, as directed by the Engineer, and no additional compensation will be allowed therefor.

Part 4 – Existing Facilities

4.01 General

Contractor shall know and comply with the requirements of Project disposal.

Performing work on existing facilities includes abandoning, adjusting, modifying, obliterating, reconstructing, relaying, relocating, remodeling, removing, repairing, resetting, or salvaging a facility.

Do not perform work on existing facility until the facility is no longer needed.

Reconstructed facilities must comply with the design of and be equal to the best parts of the existing facilities.

Reconstruction work must comply with the specifications for new work of similar materials.

If during work activities damage occurs to a facility or a portion of the facility to remain in place, or to materials to be salvaged or incorporated into the work, the Contractor shall repair or replace it.

The repair or replacement must be equal or better in quality than the original portion.

4.03 Concrete Removal

Work associated with concrete removal includes the removal and disposal of all concrete including curb, gutter, driveway, sidewalk, cross gutter, asphalt concrete, and other PCC, including existing reinforcement, to the subgrade depth as shown in the plans and as directed by the Engineer.

The Engineer will mark out the limits of the concrete to be removed and replaced.

Utility identification symbols, typically “S” for sanitary sewer and/or “W” for water, may exist on some curbs. The Contractor shall reference mark these symbols prior to removal of the curb and gutter and stamp a new symbol at the location of the original symbol or the where the utility line has been identified. A new symbol shall be stamped where the underlying utilities are identified, 1/8” minimum depth, into the curing PCC, of a plain font that is easily read with a letter height of approximately 3” placed on top and face of curb.

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Where curb, gutter, curb ramp, and cross gutter are to be removed, the adjacent asphalt concrete shall be sawcut to a neat line and the entire section width shall also be removed to the subgrade depth as shown on the plans. If no dimensions are shown on the plans or the limits are not marked out by the Engineer, the adjacent asphalt concrete shall be sawcut to a neat line at a minimum of 2-feet from the existing gutter lip of either the curb and gutter or the cross gutter, and/or the edge of existing asphalt pavement, and the entire section removed to the subgrade depth as shown on the plans. The street section being removed for curb and gutter replacement shall be replaced with a new 6-inch hot mix asphalt concrete section. HMA shall be placed and paid for in accordance with the sections titled, “Hot Mix Asphalt (HMA),” of these Specifications.

Any portion of existing improvements that is damaged by the Contractor’s activities beyond the limits of removal, as shown on the plans, as marked by the Engineer, or as specified in the Standard Specifications and/or Specifications shall be replaced by the Contractor at no cost to the City.

Existing curb, gutter, driveway, sidewalk, curb ramp, cross gutter, and asphalt pavement shall be cut to a minimum depth of 0.17 foot with an abrasive type saw at the first score line at or beyond the conformation line and the entire section shall be removed. If there are no score lines or as directed by the Engineer, the existing concrete improvement shall be sawcut at the conformation line.

The Contractor shall drill holes in the existing concrete improvements for rebar dowels where new concrete connects to existing, except at the existing apparatus room foundation, the Contractor shall rotary drill holes. Said holes shall be perpendicular to the sawcut line or roughen foundation surface, centered in the sidewalk, and sized to accommodate dowels. The new concrete improvements shall join and be flush with the existing concrete at the sawcut line with rebar dowels and expansion joint filler per City Standard S-4B. At the apparatus room foundation, the Contractor shall roughen foundation face to ¼” amplitude, bond and embed dowel as shown on the Plans.

MEASUREMENT AND PAYMENT – The Contract unit price paid per square foot for Remove & Dispose Flatwork includes full compensation for furnishing all labor, materials, tools, equipment, and incidentals and for doing all the work involved in the removal and disposal of PCC, reinforced PCC and AC flatwork, including driveways, driveway approaches, sidewalks, complete in place, including sawcutting, roughing foundation surface, the removal of materials to subgrade and disposal thereof, as described in the Contract and these Special Provisions, as directed by the Engineer, and no additional compensation will be allowed therefor.

The Contract unit price paid per linear foot for Remove & Dispose Curb & Gutter includes full compensation for furnishing all labor, materials, tools, equipment, and incidentals and for doing all the work involved in the removal and disposal of PCC curb and gutter, complete in place, including sawcutting and removal of a minimum 2-foot wide asphalt concrete section adjacent to the PCC Curb and Gutter, the removal of materials to subgrade and disposal thereof, as described in the Contract and these Special Provisions, as directed by the Engineer and no additional compensation will be allowed therefor.

Part 5 – Subbases and Bases

5.01 Aggregate Base

Aggregate base shall be Class 2, three quarter inch (¾“) maximum grading and shall conform to the provisions in Section 26, "Aggregate Bases," and the section titled “Miscellaneous Concrete” Standard Specifications and these Specifications. Recycled material, if used, shall also be Class 2, three quarter inch (¾ “) maximum grading and shall include a minimum of 30% virgin aggregates.

Contractor shall place aggregate base to the dimensions shown on the plans. All subgrade and aggregate base placed shall be compacted to a minimum relative compaction of 95%.

The Engineer will provide ongoing laboratory testing on aggregate base samples at the plant of origin and in the field. If the material is found to be out of compliance with the Standard Specifications and these Specifications, the Engineer will immediately provide notification and may

City Project No. FC25FD01 Page 8 stop the work in accordance with Article 13, “Suspension and Termination” of the General Conditions. Contractor shall provide the Engineer with five working days’ notice, in writing, of any production of aggregate base material used on this project including the specific dates of aggregate base production.

If accepted subgrade becomes saturated and/or disturbed or more than five working days pass between acceptance of the material and placement of the upper layer, the subgrade shall again be proof-rolled, and retesting will be required. The cost of the retesting will be borne by the Contractor.

Part 6 – Surfacing and Pavements

6.03 Hot Mix Asphalt (HMA)

The Contractor shall know and comply with the requirements of Section 39, “Hot Mix Asphalt,” Section 92, “Asphalts Binders,” and Section 94, “Asphaltic Emulsions,” of the 2010 Standard Specifications and these City Standard Specifications.

Amend Section 39-1.01 “General” of the Standard Specifications to add the following:

Produce and place 3/8-inch Type A HMA for leveling course, Grade PG 64-16 per Section 39- 2 “STANDARD Construction Process,” of the 2010 Standard Specifications.

Produce and place 3/4-inch Type A HMA for HMA plug, Grade PG 64-16 per Section 39-2 “STANDARD Construction Process,” of the 2010 Standard Specifications.

Amend Section 39-1.02B “Tack Coating” of the Standard Specifications to add the following:

Tack coat must be utilized and be emulsified asphalt Grade RS-1, RS-1h, SS-1, or SS-1h and must conform to Section 94 “Asphaltic Emulsions”, of the 2010 Standard Specifications.

Amend Section 39-1.02C “Asphalt Binder” of the Standard Specifications to add the following:

Asphalt binder to be mixed with aggregate shall be grade PG 64-16.

The Contractor must submit mix designs for all asphalt concrete to be used on the project.

Amend Section 39-1.02E “Aggregate” of the Standard Specifications to add the following quality characteristic to the “Aggregate Quality” table:

The Durability Index for all HMA aggregates must be a minimum of 35.

The aggregate must not be treated with lime, cement or other chemical material before the Durability Index test is performed.

Amend Section 39-1.03A “General” of Hot Mix Asphalt Mix Design Requirements of the Standard Specifications to add the following:

The HMA must be ½ inch Type “A” HMA

Amend Section 39-1.03C “Job Mix Formula Submittal” of the Standard Specifications to add the following:

The Contractor must submit mix designs for all asphalt concrete to be used on the project.

Each delivery ticket must include information on the material type, binder type, oil content, and the mix design number. Material delivered to the project without such annotations shall be subject to rejection. Only original delivery tickets (no photocopies) shall be delivered to the Engineer on a daily basis.

Amend Section 39-1.04F “Density Cores” of the Standard Specifications to delete the following:

To determine density for Standard and QC/QA construction process projects, take 4- or 6-inch diameter density cores at least once every 5 business days. Take 1 density core for every 250 tons of HMA from random locations the Engineer designates. Take density cores in the Engineer's

City Project No. FC25FD01 Page 9 presence and backfill and compact holes with authorized material. Before submitting a density core, mark it with the density core's location and place it in a protective container.

If a density core is damaged, replace it with a density core taken within 1 foot longitudinally from the original density core. Relocate any density core located within 1 foot of a rumble strip to 1 foot transversely away from the rumble strip.

Amend Section 39-1.04F “Density Cores” of the Standard Specifications to add the following:

In-place density and relative compaction for the Standard Construction Process projects is determined by the nuclear density device per California Test 375.

Amend Section 39-1.07 “Production Start-Up Evaluation” of the Standard Specifications to delete the following:

Within the first 750 tons produced on the 1st day of HMA production, in the Engineer's presence and from the same production run, take samples of:

For Standard and QC/QA construction process projects, take 4- or 6-inch diameter density cores within the first 750 tons on the 1st day of HMA production. For each density core, the Department reports the bulk specific gravity determined under California Test 308, Method A, in addition to the percent of maximum theoretical density. You may test for in-place density at the density core locations and include them in your production tests for percent of maximum theoretical density.

Amend Section 39-1.07 “Production Start-Up Evaluation” of the Standard Specifications is add the following:

Within the first 500 tons produced on the 1st day of HMA production, in the Engineer's presence and from the same production run, take samples of:

In-place density and relative compaction for the Standard Construction Process projects is determined by the nuclear density device per California Test 375. Test density within the first 500 tons on the 1st day of HMA production.

Amend Section 39-1.09A “General” of Subgrade, Tack Coat, and Geosynthetic Pavement Interlayer of the Standard Specifications to add the following:

Surface Preparation

The work must consist of preparing the existing street surfaces prior to the commencement of paving. Such work shall include removing raised pavement markers, removing thermoplastic and painted traffic markings and legends, controlling nuisance water, sweeping, watering, and removing loose and broken asphalt concrete pavement and foreign material as specified in the Standard Specifications and these Specifications, and as directed by the Engineer. The removal of existing markers, striping and pavement markings shall conform to the sections titled “Removal of Pavement Markers” and “Removal of Traffic Stripes and Pavement Markings” of these Specifications.

Amend Section 39-1.11 “Transporting, Spreading, and Compacting” of the Standard Specifications to add the following:

The Contractor must have hand-compaction equipment immediately available for compacting all areas inaccessible to rollers. Hand-compaction must be performed concurrently with breakdown rolling. If for any reason hand-compaction falls behind breakdown rolling, further placement of HMA must be suspended until hand-compaction is caught up. Hand-compaction includes plate compactor, pneumatic tamper and hand tampers. Hand torches must be available for rework of areas which have cooled.

After compaction, the surface texture of all hand work areas must match the surface texture of the machine placed mat. Any course or segregated areas must be corrected immediately upon discovery. Failure to immediately address these areas will cause suspension of HMA placement until the areas are satisfactorily addressed, unless otherwise allowed by the Engineer.

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Cold Joints

All cold joints, both longitudinal and transverse, must be heated with a torch immediately prior to paving. Cold joints include previously installed asphalt passes that are more than three hours old.

All cold joints must be tack coated.

Tolerances

The average pavement thickness must be equal to the specified thickness for the project. For total pavement thicknesses of less than four inches, the minimum allowable thickness will be ¼ inch less than that specified. For total pavement thicknesses of four inches or more, the minimum allowable thickness will be ½ inch less than that specified.

You are responsible for verifying the anticipated tonnage for each street segment using the data from the JMFs for the mix to be used at least 10 days prior to paving. If the anticipated quantity varies more than +/-5% from that indicated in the bid schedule, you must notify the Engineer in writing of the discrepancy and provide computations regarding tonnage.

Daily Paving Completion

The Contractor must schedule paving activities such that each layer of HMA is placed across the entire excavated area at the end of each work shift.

Pavement Thickness and Temperatures

Pave HMA in maximum 0.25-foot thick compacted layers.

If the surface to be paved is both in sunlight and shade, pavement surface temperatures must be taken in the shade.

Spread HMA Type A and Type B at the atmospheric and surface temperatures shown in the following table:

Minimum Atmospheric and Surface Temperatures

Compacted layer thickness, feet

Atmospheric, °F Surface, °F

Unmodified asphalt binder

Modified asphalt bindera

Unmodified asphalt binder

Modified asphalt bindera

<0.15 55 50 60 55

0.15-0.25 45 45 50 50 aExcept asphalt rubber binder.

If the asphalt binder for HMA Type A and Type B is unmodified asphalt binder, complete:

1. First coverage of breakdown compaction before the surface temperature drops below 250 degrees F

2. Breakdown and intermediate compaction before the surface temperature drops below 200 degrees F

3. Finish compaction before the surface temperature drops below 150 degrees F

If the asphalt binder for HMA Type A and Type B is modified asphalt binder, complete:

1. First coverage of breakdown compaction before the surface temperature drops below 240 degrees F

2. Breakdown and intermediate compaction before the surface temperature drops below 180 degrees F

3. Finish compaction before the surface temperature drops below 140 degrees F

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Amend Section 39-2.02B “Quality Control Testing” of the Standard Specifications is remove the following:

For any single quality characteristic except smoothness, if 2 consecutive quality control test results do not comply with the action limits or specifications:

1. Stop production.

2. Notify the Engineer.

3. Take corrective action.

4. Demonstrate compliance with the specifications before resuming production placement.

Amend Section 39-2.03A “Testing” of the Standard Specifications to remove the following:

Remove “HMA Acceptance – Standard Construction Process” Table.

No single test result may represent more than 750 tons or 1 day's production, whichever is less.

For any single quality characteristic except smoothness, if 2 consecutive quality control test results do not comply with the action limits or specifications:

1. Stop production.

2. Take corrective action.

3. Take samples and split each sample into 4 parts in the Engineer’s presence. Test 1 part for compliance with the specifications and submit 3 parts to the Engineer. The Department tests 1 part for compliance with the specifications and reserves and stores 2 parts.

4. Demonstrate compliance with the specifications before resuming production placement and placement.

The Department tests the density core you take from each 250 tons of HMA production. The Department determines the percent of maximum theoretical density for each density core by determining the density core's density and dividing by the maximum theoretical density.

If the specified total paved thickness is at least 0.15 foot and any layer is less than 0.15 foot, the Department determines the percent of maximum theoretical density from density cores taken from the final layer measured the full depth of the total paved HMA thickness.

For percent of maximum theoretical density, the Engineer determines a deduction for each test result outside the specifications using the reduced payment factors shown in the following table:

Amend Section 39-2.03A “Testing” of the Standard Specifications to add the following:

The City will perform acceptance testing of the HMA based on the Acceptance Criteria as shown in the following Table 1.

Table 1 - HMA Acceptance - Standard Construction Process

Quality characteristic Test method HMA Type A Frequency Location of Sampling

Aggregate gradiationa California Test

JMF ±

tolerancec

1 per day At plant per CT

Sieve 3/4" 1/2" 3/8"

1/2" Xb

3/8" X

City Project No. FC25FD01 Page 12

Quality characteristic Test method HMA Type A Frequency Location of Sampling

No. 4 X

No. 8 X X X

No.

200 X X X

Sand equivalent (min)d California Test

47 1 per day At plant per CT

Asphalt binder content

California Test 379 or 382

JMF ± 0.45 1 per 500 TONS Loose mix behind paver per CT 125

HMA moisture content (%, max)

California Test 226 or 370

1.0 1 per 500 TONS Loose mix behind paver per CT 125

Percent of maximum theoretical density (%) e, f

California Test

91-97 1 per day (max th.

Density)

Loose mix behind the paver

In-Place Density and Relative Compaction

(Nuclear)

Nuclear California Test 375 or ASTM

D2950

91-97 1 per 500 TONS Random locations per CT 375

Stabilometer value (min) d,g

1/2" and 3/4" gradings

California Test

37 1 per 500 TONS Loose mix behind paver per CT 125

Air Void content (%) d, h California Test

4 ± 2 1 per 500 TONS Loose mix behind paver per CT 125

Asphalt binder Various Section 92 Sample 1 per day At plant per CT

Percent of crushed particles Coarse aggregates (%, min) One fractured face Two fractured faces

Fine aggregate (%, min) (Passing no. 4 sieve and retained on no. 8 sieve.)

One fractured face

California Test

1 per mix per plant (sample aggregates 1 per day and hold)

At Plant

Los Angeles Rattler (%, max)

Loss at 100 rev.

Loss at 500 rev.

California Test

Fine aggregate angularity (%, min)

California Test 234 45

City Project No. FC25FD01 Page 13

Quality characteristic Test method HMA Type A Frequency Location of Sampling

Flat and elongated particles (%, max by weight @ 5:1)

California Test

Report only

Voids filled with asphalt (%) i No. 4 grading 3/8" grading 1/2" grading 3/4" grading

California Test

76.0-80.0 73.0-76.0 65.0-75.0 65.0-75.0

Voids in mineral aggregate (% min)i

No. 4 grading 3/8" grading 1/2" grading 3/4" grading

California Test

17.0 15.0 14.0 13.0

Dust proportioni No. 4 and 3/8" gradings 1/2" and 3/4" gradings

California Test 367 0.9-2.0

0.6-1.3

Smoothness Section 39-1.12

12-foot straight-edge, must grind, and PI

As necessary to confirm contract compliance

Final pavement surface aThe Engineer determines combined aggregate gradations containing RAP under California Test 367.

b "X" denotes the sieves the Engineer tests for the specified aggregation gradiation.

c The tolerances must comply with the allowable tolerances in section 39-1.02E.

d The Engineer reports the average of 3 tests from a single split sample.

eThe Engineer determines percent of maximum theoretical density if the specified paved thickness is at least 0.15 foot under California Test 375, except the Engineer uses:

1. California Test 308, Method A, to determine in-place density of each density core instead of using the nuclear gauge in Part 4, "Determining In-Place Density By The Nuclear Density Device"

2. California Test 309 to determine maximum theoretical density instead of calculating test maximum density in Part 5, "Determining Test Maximum Density."

f The Engineer determines maximum theoretical density (California Test 309) at the frequency specified for Test Maximum Density under California Test 375, Part 5.D.

g California Test 304, Part 2.13.

h The Engineer determines the bulk specific gravity of each lab-compacted briquette under California Test 308, Method A, and theoretical maximum specific gravity under California Test 309.

i Report only if the adjustment for the asphalt binder content TV is less than or equal to ±0.3 percent from the OBC value submitted on a Contractor Hot Mix Asphalt Design Data form.

If the Acceptance test results do not meet the Acceptance Criteria shown in Table 1 the HMA shall be rejected, removed and replaced as directed by the Engineer at Contractor’s expense.

Field density acceptance testing will be accomplished using the nuclear gauge method. If the density acceptance tests indicate failing compaction results, the Engineer determines a deduction for each test result outside the Acceptance Criteria using the “Reduced Payment Factors for Percent of Maximum Theoretical Density,” table in Section 39-2.03A “Testing” of the 2010 Standard Specifications.

If the Contractor requests verification of the nuclear density results by coring, the Contractor

City Project No. FC25FD01 Page 14 must perform the coring at no cost to the City.

The Engineer will randomly identify core locations and test cores for density at no cost to the City.

The Contractor must backfill the core holes with HMA temperatures above 250°F. The HMA must be firmly tamped in place in lifts not to exceed three (3) inches. Tamping must consist of a minimum of 20 blows with a ten-pound minimum weight bar with an approximate two (2) inch diameter head or by a suitable head attached to a demolition hammer or pneumatic hammer.

The finished surface must be flush with the adjacent pavement surface.

MEASUREMENT AND PAYMENT – The Contract unit price paid per ton for HMA (6” Plug) includes full compensation for providing all labor, materials, tools, equipment and incidentals and for doing all the work involved in this section, including pavement preparation, variations of aggregate gradations, tack coat, placing and compacting HMA, trucking, and sweeping, complete in place, as shown on the plans, as specified in the Standard Specifications and these Special Provisions, as directed by the Engineer, and no additional compensation will be allowed therefor.

6.04 Hot Mix Asphalt (HMA) Plug

Contractor shall know and comply with the requirements of the section titled “Hot Mix Asphalt (HMA)” and “Maintaining Traffic,” of these Specifications.

All existing material within the limits of the “Full Depth AC Plug” areas must be excavated down from the existing surface to the proposed subgrade and removed, as shown on the plans and as directed by the Engineer. Asphalt concrete plugs must consist of ½” Type A, hot mix asphalt concrete as defined in the section titled “Hot Mix Asphalt (HMA),” of these Specifications.

The Engineer accompanied by the Contractor must mark the exact limits and record the dimensions of the 6- inch asphalt concrete plugs to be removed and replaced. Unless otherwise authorized by the Engineer, any additional area removed and replaced beyond the limits as marked must not be measured nor paid for. Contractor and the Engineer must agree on the limits and area prior to the start of the removal.

Contractor shall be aware that the limits of the asphalt concrete plug area of removal varies in width and length and may or may not be consistent with the width of the grinder. The City will not be responsible for the Contractor’s error in removing material beyond the limits of the areas as marked in the field. All extra road sections removed beyond the limits marked are at the Contractor’s expense.

The outline of the asphalt concrete to be removed must be cut to a neat, straight, clean vertical edge with square corners using a power-driven saw and removing the surfacing for a minimum depth of two inches. If a grinder is used to excavate the asphalt concrete plug areas, the vertical edges perpendicular to the flow of traffic shall be prepared to a smooth vertical edge, full depth, after completion of excavation.

Surfacing and base must be removed without damage to surfacing that is to remain in place.

Damage to or removal of surfacing which is to remain in place must be repaired/replaced in accordance with the requirements of this Section. Surfacing and base material removed for the Contractor’s convenience must be at their expense and will not be measured nor paid for.

After removing the surfacing and base to the required uniform depth, the undisturbed material at the base of the excavation must be compacted to 95% relative compaction. Compaction must consist of three passes on the subgrade material using the same compaction equipment that will be used for the placement of asphalt concrete plug material, or an alternative method approved by the Engineer. The subgrade material must be proof-rolled in the presence of and approved by the Engineer prior to the placement of any asphalt concrete. If the subgrade material, in the opinion of the Engineer, is unsuitable the Engineer may direct the Contractor to remediate the subgrade as

City Project No. FC25FD01 Page 15 extra work pursuant to the section titled, “Extra Work,” of the General Conditions and Special Conditions. Areas of base material which are low as a result of over excavation not ordered by the Engineer must be filled, at the Contractor’s expense, with asphalt concrete conforming to the section titled “Hot Mix Asphalt (HMA),” of these Specifications.

After approval of the subgrade material by the Engineer, the Contractor shall prime horizontal and vertical surfaces with tack coat. Tack coat must be applied to all horizontal and vertical edges of the repair area in accordance with the section titled “Hot Mix Asphalt (HMA)” of these Specifications.

All debris generated from this activity must be hauled off-site at the end of each workday.

MEASUREMENT AND PAYMENT – The Contract unit price paid per ton of HMA (6” Plug) includes full compensation for furnishing all labor, material, tools, equipment and incidentals, and for doing all the work involved in installing hot mix asphalt concrete plugs, including but not limited, compaction of the subbase, prime and tack coating, and supplying, placing and compacting asphalt concrete, trucking, sweepers complete in place, as shown on the plans, as specified in the Standard Specifications and these Special Provisions, and as directed by the Engineer and no additional compensation will be allowed therefor.

Part 7 – Miscellaneous Construction

7.01 Miscellaneous Concrete Construction

All sidewalk, curb and gutter, curb ramps, cross gutters, and driveways shall conform to the provisions in Section 73, "Concrete Curbs and Sidewalks," Section 90, “Concrete”, and the section titled, “PCC Curb Ramp,” of the Standard Specifications and these Specifications.

This work shall be constructed of minor concrete conforming to the provisions in Section 90-2, "Minor Concrete," except as follows:

1. The maximum size of aggregate used for extruded or slip-formed curb construction shall be at the Contractor’s option, but in no case will the maximum size be larger than one inch nor smaller than 3/8 inch.

2. The cement content of the minor concrete shall be not less than 564 pounds per cubic yard.

Primary aggregate nominal size shall be of 1” x No.4 coarse aggregate gradation per Section 90- 1.02C(4)(b), “Coarse Aggregate Gradation,” of the Standard Specifications.

If within the areas of improvements, Contractor locates AT&T, PG&E, and/or Comcast utility boxes, the Contractor shall not be responsible for setting said utility boxes to grade. However, the Contractor will be responsible for coordinating with AT&T, PG&E, and/or Comcast for the adjustment of the facilities prior to installing new concrete and asphalt concrete. Contractor shall provide written notice of the Contractor’s schedule and coordinate concrete removal activities with the affected utility companies at least 14 calendar days in advance of any concrete demolition work adjacent to the utility facilities. Should the Contractor’s schedule change, the Contractor shall re-notify the utility company in writing at least 14 calendar days in advance of any subsequent concrete demolition work.