SPECIFICATIONS FINAL 20200227

SPECIFICATIONS

FOR

COUNTY 17TH STREET AT WEST MAIN CANAL BRIDGE REPLACEMENT

CIP 1.1802

February, 2020

Yuma County Department of Development Services

2351 W. 26th Street Yuma, Arizona 85364

(928) 817-5000

TC-1 of 2  

TABLE OF CONTENTS County 17th Street at West Main Canal

CIP 1.1802

THE SPECIFICATIONS CONTAIN:

PROPOSAL PAMPHLET (Bound Separately)

Project Name, Location and General Description

Advertisement for Bids

Information for Bidders

Receipt Acknowledgement Form

Proposal Kit

Proposal

Bid Schedule

Bid Surety Bond

Non-Collusion Affidavit

Bidder's Participation, Subcontractor and Supplier List

Contract Kit

Contract

Contract Performance Surety Bond

Labor and Materials Surety Bond

Certificate of Insurance

Contractor's Affidavit Regarding Settlement of Claims

PUBLIC WORKS STANDARDS FOR YUMA COUNTY, VOLUME I DATED AUGUST 1998 (Separate Publication)

IN ITS ENTIRETY INCLUDING CONSTRUCTION STANDARDS

PUBLIC WORKS STANDARDS, FOR YUMA COUNTY VOLUME II DATED JULY 1993 (Separate Publication)

IN ITS ENTIRETY INCLUDING ALL GENERAL CONDITIONS AND TECHNICAL SPECIFICATIONS

TC-2 of 2  

SPECIAL PROVISIONS

PUBLIC WORKS STANDARDS, VOLUME 11 - GENERAL PROVISIONS

SECTION 102

SECTION 103

SECTION 104

SECTION 105

SECTION 106

SECTION 107

SECTION 108

SECTION 109

BIDDING REQUIREMENTS AND CONDITIONS

AWARD AND EXECUTION OF CONTRACT

SCOPE OF WORK

CONTROL OF WORK

CONTROL OF MATERIALS

LEGAL RELATIONS AND RESPONSIBILITY TO PUBLIC

COMMENCEMENT, PROSECUTION AND PROGRESS

MEASUREMENTS AND PAYMENTS

PUBLIC WORKS STANDARDS, VOLUME II - TECHNICAL PROVISIONS

SECTION 205

SECTION 210

SECTION 225

SECTION 402

ROADWAY EXCAVATION

BORROW

WATER

CONSTRUCTION SURVEYING AND LAYOUT

THE FOLLOWING ADOT SPECIFICATION IS INCORPORATED AS NOTED

SECTION 601 CONCRETE STRUCTURES

ADDITIONAL TECHNICAL PROVISIONS

THE FOLLOWING SECTIONS ARE ADDED TO THESE SPECIAL PROVISIONS

SECTION 321 ASPHALTIC CONCRETE PAVEMENT (REV. 01/07/2005)

SECTION 404 STORM WATER POLLUTION PREVENTION PLAN [SWPPP]

SECTION 451 TRAFFIC CONTROL (REPLACES SECTION 401)

SECTION 710 ASPHALT CONCRETE (REV. 01/07/2005)

SECTION 711 PAVING ASPHALT (REV. 01/07/2005)

ADDITIONAL PROVISIONS

THE FOLLOWING SECTION IS INCORPORATED AS NOTED

1 BRIDGE REPLACEMENT

2 OVERHEAD LINES

3 SURVEY MONUMENTS

4 CONTRACTOR PARTICIPATION

5 BRIDGE DEMOLITION

SP-1 of 10  

Special Provisions Yuma County

County 17th Street at West Main Canal Project CIP 1.1802

February, 2020

The purpose of these Special Provisions is to supplement, modify, replace and/or delete that portion of the Public

Works Standards for Yuma County Volumes I and II, given herein, which do not meet specific requirements of this

project.

PUBLIC WORKS STANDARDS FOR YUMA COUNTY, VOLUME II GENERAL CONDITIONS

SECTION 102 BIDDING REQUIREMENTS AND CONDITIONS

Section 102.2 Contents of Proposal Pamphlet of the Standard Specifications, first paragraph is revised to read:

The prospective bidder may examine and/or purchase plans, special provisions, and proposal pamphlets at the Yuma County Department of Development Services, Engineering Office. Alternatively, an electronic version of the BID documents is available on line at http://www.yumacountyaz.gov. CAD drawings are not provided to the successful bidder.

The Proposal Pamphlet will state the location of the contemplated construction, give the description of the various quantities of work to be performed or materials to be furnished and have a bid schedule of pay items for which unit bid prices are invited. In addition, it will state the form and amount of the proposal guarantee, the time in which the work shall be completed and include additional instructions not included in these specifications.

The standard plans, project plans, the standard specifications, the standard details, the special provisions, the contracting agency’s supplements and all supplementary documents are essential parts of the contract and a requirement occurring in one is as binding as though occurring in all. They are intended to be complementary and to describe and provide for a complete work.

Section 102.5 Examination of Plans, Special Provisions and Site of Work of the Standard Specifications is modified to add:

The Bidder shall be responsible to investigate the project site, inspect the ground water levels, satisfy himself as to the actual conditions, anticipate fluctuations in the ground water table and anticipate potential surface water flows as a condition to be encountered in the performance of his work.

It shall be the Contractor’s responsibility to control all water to the extent required to complete the contract items, and to repair and restore all damages due to the ground water fluctuations and surface water flows at no cost to the County. Depth to groundwater in the Project area is unknown.

No additional measurement or additional compensation will be made for any additional work required or associated with pipeline excavations, earthwork, structures, protecting work areas, move-out and move-in due to flooding (including flood irrigation), damaged equipment, or dewatering of construction areas, the cost being considered as included in the cost of contract items.

SP-2 of 10  

SECTION 103 AWARD AND EXECUTION OF CONTRACT

Section 103 Award and Execution of Contract of the Standard Specifications is modified to add the following:

103.10 Standard Specifications and Details

All work done under this Contract shall be accomplished in accordance with the Public Works Standards For Yuma County Volume I (dated August, 1998) and Volume II (dated July, 1993) supplemented by these Special Provisions for this project. When other specifications, standards, details, or documents are referenced, the latest revisions shall be used, unless otherwise specified.

103.11 Plans: The following sealed drawings, in print form, are the plans for this project, as revised:

County 17th Street at West Main Canal Sheet No. Title

0 Cover Sheet 1 Survey Control

2 - 3 Topographic Survey

4 Typical Sections 5 Plan and Profile 6 - 12 Structural Plan Sheets

Printed and PDF copies of Plans will be provided to Bidders and Contractor. Electronic copies of the plans, regardless of format or source, are not official copies of the plans. Copy fees apply unless otherwise specified.

SECTION 104 SCOPE OF WORK

Section 104 Scope of Work of the Standard Specifications is modified to add the following:

Contractor’s Participation: Contractor shall self-perform at least 51% of the project based on the value established by the Bid Schedule.

104.1.3 Site Cleanup At reasonable intervals during the progress of the work, cleanup and disposal of waste materials and debris will be performed on the project site. Waste materials and debris shall be disposed of by the Contractor at legally established landfill areas, private disposal sites located by the Contractor or as directed by the Engineer.

The Contractor shall be responsible for and incur all costs for periodic and final cleanup of the site during construction. Payment for cleanup and disposal shall be an integral part of associated Bid Items shown on the Contract Proposal. No separate payment shall be made for cleanup and disposal. Should the Contractor dispose of excavated soils on a private property, the Contractor shall first review the site with a representative of the Engineer to determine the impact upon any existing floodplains, grading requirements and permitting requirements and written and signed permission from the property owner.

104.3 Notification of Claims Section 104.03, of the 2008 Arizona Department of Transportation Standard Specifications for Road and Bridge Construction is incorporated into this contract by reference.

The notice requirements of this incorporated section are stringent. The Contractor is hereby advised that failure to make proper notice as required waives the right to additional compensation.

SP-3 of 10  

SECTION 105 CONTROL OF WORK

Section 105 Control of Work of the Standard Specifications is modified to add:

105.5 Coordination of Plans and Specifications In a case of a discrepancy or conflict, the order in which the various documents shall govern is as follows from highest to lowest: addenda, special provisions, plans, agency’s supplements to the standard Specifications, agency’s supplements to the standard details, standard specifications and standard details.

105.16 (C) Substantial Completion Section 105.19 of the 2008 Arizona Department of Transportation Standard Specifications for Road and Bridge Construction is incorporated into this contract by reference.

SECTION 106 CONTROL OF MATERIALS

Section 106 Control of Materials of the Standard Specifications is modified to add the following:

106.1 Source of Materials Quality The Contractor shall be responsible for providing all materials to the project. No time extensions or adjustments to the contract will be made due to lack of a materials source being available in close proximity to the project.

Any materials source used for the project shall be properly permitted as applicable. Upon request, the Contractor shall furnish documentation showing the materials source used for the project has current permits as required by local, County, State or Federal regulations.

106.2 Tests and Acceptance of Materials The county will contract with an independent testing laboratory to sample and test materials incorporated into the project. Testing will include but is not limited to soil sampling, establishment of proctors, compaction testing, concrete sampling and testing, and the review of all mix designs. The testing laboratory is required to send one copy of all test results to Yuma County and one copy to the contractor. After the establishment of compactive effort on earth and aggregate (five tests maximum), any retesting due to failed tests will be at the Contractor’s expense. A supplemental agreement will be executed at the conclusion of the contract to adjust the contract for the County’s cost of retesting compaction.

SECTION 107 LEGAL RELATIONS AND RESPONSIBILITY TO PUBLIC

Section 107 Legal Relations and Responsibility to Public of the Standard Specifications is modified to add the following:

107.2 Permits The contractor shall conform to all the requirements set forth by the Arizona Department of Environmental Quality [ADEQ] for the AZ Pollution Discharge Elimination System [AZPDES] Phase II for construction sites larger than one acre. The contractor shall submit a Notice of Intent (NOI) to ADEQ and maintain and implement a Storm Water Pollution Prevention Plan [SWPPP] on site.

107.6 Public Convenience and Safety The Contractor shall provide safety construction fencing around all open trenches, excavations, material and equipment storage yards and other work zones during all non-working hours and while unattended.

There will be no separate measurement or payment for furnishing, installing or maintaining protective fencing. The cost shall be considered incidental to the cost of the appurtenant work.

SP-4 of 10  

The contractor shall maintain local access to all side streets, access roads, driveways, alleys and parking lots at all times.

107.11 Contractor’s Responsibility for Utility Property and Services Paragraph three is modified to:

It shall be the Contractor’s responsibility to verify the existence and location of all utilities. Omission from, or the inclusion of, utility locations on the plans is not to be considered as the non-existence of, or definite location of, existing utilities.

It shall be the contractor’s responsibility to provide seven (7) calendar days’ notice to all appropriate governmental agencies and utility companies prior to starting work affecting their area of concern.

It shall be the contractor’s responsibility, prior to construction within the County 17th Street Project to coordinate their works with Yuma County and Yuma County Water Users Association.

According to the BOR's requirements when working within BOR right of way, notification is required as follows:

Water Outage - Notify Yuma County Water Users Association, Sr. Engineering Technician Omar Penunuri at

[928] 627-8824 Ext. 25 at least two [2] weeks prior to construction operations to coordinate water outage scheduled for August 3, 2020 to August 9, 2020 at the West main Canal.

YCWUA Inspections Notify Yuma County Water Users Association, Sr. Engineering Technician Omar

Penunuri at [928] 627-8824 Ext. 25 at least 48 hours in advance of construction operations at the West main canal to allow YCWUA Inspector to be on site during the construction.

The following utility companies have facilities in the area but are not anticipated to be in conflict:

Century Link Chuck Erickson (928)-446-2144

The Contractor’s attention is called to the existence of overhead lines within, crossing and adjacent to the project. The Contractor at all times shall maintain the proper, safe, legal clearances to all overhead lines as required by federal, state and local regulations. During excavation, the Contractor will maintain a minimum of 5 feet of lateral clearance around the base of overhead line poles unless arrangements are made with utility owner to ensure the integrity of the pole’s foundation.

The following utility companies have known facilities within the proposed construction, and anticipate certain adjustments and relocations:

Bureau of Reclamation [BOR] Chris Patane [928] 336-8367 Yuma County Water Users Association [YCWUA]          Omar  Penunuri                          [928] 627‐8824 Ext. 25  

SP-5 of 10  

107.12.1 Air Quality Non-Attainment Area This project is located within the Yuma PM10 Non-attainment Area for airborne dust particles. Prior to construction the Contractor will be required to submit for approval a Dust Control Plan. The plan must be able to reduce and maintain visible emissions from fugitive dust sources to a minimum daily. The plan should address the following mitigation action items:

A. Control for traffic emission from within the construction site. B. Control of track out from unpaved areas of the construction site. C. Control of emissions from haul trucks. D. Dust control measures at all construction staging areas, detour routes and worksites. E. Control of dust by the use of covers on all trucks hauling material to and from the project.

Measures to clean paved roads may include, but are not limited to water flushing, vacuum sweeping and manual cleaning of access points.

No measurement or direct payment will be made for this item, the cost being considered incidental to the project.

107.13.1 Right of Way/Property Acquired Yuma County and the Yuma County Water Users Association own the right-of-way/property for the permanent project features. No construction activities are allowed to occur beyond the established right-of-way. Any damage to adjacent property due to construction or its related activities is the responsibility of the contractor.

107.16 Notices The contractor shall provide written notification to Yuma County, the Yuma County Water Users Association, and adjacent property owners two weeks prior to beginning construction. The contractor shall provide the proposed construction schedule, contact personnel with telephone numbers, temporary fencing plans, equipment and material storage plans, anticipated utility disruptions or relocations and any other pertinent information.

SECTION 108 COMMENCEMENT, PROSECUTION AND PROGRESS

108.1 Pre-Construction Conference of the Standard Specifications is modified to add: Prior to and as a prerequisite of the Notice to Proceed the contractor shall provide the County with the following submittals for review and at least five (5) working days prior to preconstruction meeting:

1. PROPOSED PROJECT MATERIALS

2. CONSTRUCTION SCHEDULE 3. SAFETY PLAN

4. TRAFFIC CONTROL PLAN [11X17” SHEET] 5. LISTING of AFTERHOURS / EMERGENCY CONTACT PERSONNEL for the CONTRACTOR AND

SUBCONTRACTORS [INCLUDE OFFICE AND CELL PHONE NUMBERS

6. EQUIPMENT LIST [TO INCLUDE BRAND, MODEL, YEAR, CAPACITY] 7. SURVEY PLAN AND SCHEDULE

8. SUBCONTRACTORS LIST- [CONTACT NAME, ADDRESS, TELEPHONE & FAX NO’S] 9. DUST CONTROL PLAN

10. MATERIAL SUPPLIERS LIST [CONTACT NAMES, ADDRESS, TELEPHONE & FAX NO’S] 11. SHOP DRAWINGS FOR CULVERT, OUTLETS & INLET.

SP-6 of 10  

108.2 Notice to Proceed of the Standard Specifications is modified to add: After the pre-construction conference and once all required submittals are reviewed, a notice to proceed will be issued by the Contracting Agency.

Neither the Contractor nor any Subcontractor shall commence work on a project prior to receipt of the written Notice to Proceed from the Contracting Agency. The Contractor shall begin work within 15 days after the date of the Notice of Award of contract from the Board of Supervisors. All work under the contract shall be completed within the time stated in the Proposal Pamphlet.

108.9 Determination And Extension of Contract Time Paragraph three is modified to: The work included in this project shall be completed by September 4, 2020. The Contract Time will expire on this date.

SECTION 109 MEASUREMENTS AND PAYMENTS

109.2 Measurements and Payments – Scope of Payment of the Standard Specifications is modified to add:

109.2.1 Measure and Payment For Pay Items In The Proposal The items listed in the Bid Schedule of the Proposal are intended to include the major items for the project; however, there is other work necessary to complete the project. If work to complete the project has not been designated by a specific item on the Bid Schedule, the Contractor shall include the cost for the work in some related bid item so that his/her Proposal for the Project does reflect the total cost of all necessary and required work to complete the project in its entirety.

Payment for sheeting, shoring and bracing for the protection of property, life and limb, in conformance with the applicable permits and safety orders and standards will not be paid as separate item and shall be distributed in with applicable bid items.

109.4 Compensation for Alteration of Work of the Standard Specifications is modified to add: Adjustment in bid item unit prices shall only apply to major items of work when considering an adjustment for an over run in excess of 20% or an under run in excess of 20%. A major item of work as defined by Section 101 of the General Conditions is an item on the bidding schedule whose total cost is greater than five percent (5%) of the total contract price.

SP-7 of 10  

PUBLIC WORKS STANDARDS FOR YUMA COUNTY, VOLUME II TECHNICAL PROVISIONS

SECTION 205 ROADWAY EXCAVATION

205.16 Method of Measurement of the Standard Specifications is revised to read:

The bidding schedule quantity for roadway excavation will be considered to be the final quantity for the project unless

the Contractor or the Engineer initiates an adjustment if evidence indicates that the required quantity varies by an

amount greater than five percent [5%] of the Bidding Schedule quantity. The Contractor shall advise the Engineer in

writing, submitting such evidence and requesting an adjustment of the quantities. The Engineer will determine the

amount of adjustment, if any. The quantity upon which payment will be based will be the Bidding Schedule quantity

plus or minus only that portion of the adjustment that exceeds five percent of the Bidding Schedule quantity. Minimum

evidence shall include a full set of as-built cross sections for the project and clear and concise earthwork calculations

computed in cubic yards by the average end area method. The Engineer will provide information to the Contractor as

to what format of cross sections will be acceptable for review.

SECTION 210 BORROW

210.5 Method of Measurement of the Standard Specifications is revised to read:

The bidding schedule quantity for borrow will be considered to be the final quantity for the project unless the

Contractor or the Engineer initiates an adjustment if evidence indicates that the required quantity varies by an amount

greater than five percent [5%] of the Bidding Schedule quantity. The Contractor shall advise the Engineer in writing,

submitting such evidence and requesting an adjustment of the quantities. The Engineer will determine the amount of

adjustment, if any. The quantity upon which payment will be based will be the Bidding Schedule quantity plus or minus

only that portion of the adjustment that exceeds five percent [5%] of the Bidding Schedule quantity. Minimum

evidence shall include a full set of as-built cross sections for the project and clear and concise earthwork calculations

computed in cubic yards by the average end area method. The Engineer will provide information to the Contractor as

to what format of cross sections will be acceptable for review.

Should the item of the earthwork to be adjusted also be a major item, the determination as to whether the unit price

may be adjusted will be based on the difference between the final quantity and the bid schedule quantity plus or

minus the five percent [5%] tolerance.

Neither variations in shrink or swell of material from those shown on the plans, nor variations of shrink or swell from

contractor obtained sources will be reason for establishing a quantity adjustment.

Adjustments in earthwork quantities due to revisions ordered by the Engineer will be isolated by measurement or

calculation. The bidding schedule quantities will be adjusted by the amount of the ordered change and will not be

included in any other adjustment of the bidding quantities as specified in this subsection.

SP-8 of 10  

SECTION 225 WATER

225.1 Description of the Standard Specifications is modified to add: Watering shall include making arrangements for developing water sources and supplying all labor, equipment and materials to collect, load, transport and apply water as necessary for compaction of materials, concrete construction operations, testing, dust control, pre-wetting and other material and construction uses.

225.2 Water Supply of the Standard Specifications is modified to add: Water shall be clean and free from objectionable deleterious amounts of acids, alkalis, salts or organic materials.

SECTION 402 CONSTRUCTION SURVEYING AND LAYOUT

402 Construction Surveying and Layout of the Standard Specifications is modified to add the following:

402.1 Description of the Standard Specifications is modified in the first paragraph last two sentences as follows: The work shall be done under the direction of an Arizona registered professional engineer employed by the contractor. All right of way monuments and lines shall be established by an Arizona registered land surveyor employed by the contractor.

402.4 Construction Requirements of the Standard Specifications is modified to add: Failure of the contractor to verify control points in writing to the Engineer shall serve to waive any contractor request for additional compensation based on error in the control points.

The contractor is required to control the construction of cuts and fills by the use of slope stakes or off-set slope stakes. Slope building is to be controlled at all times by a grade checker working from the slope stakes. Failure to use slope stakes and a grade checker will result in no payment for the work done.

402.4.1 “As-Built” Record Drawing The Contractor shall prepare and furnish “As-Built” record drawings to Yuma County. The Contractor shall obtain one (1) set of plans from the Engineer and shall record in red colored pencil all cases where actual field construction differs from work shown on the plans. All concealed work and utility locations shall be dimensioned. Drawings shall be maintained in a current condition at all times until completion of the work and shall be made available for review by the engineer at all times.

In addition to “As-Built” record drawings, as-built cross sections shall be required if deemed necessary by the Engineer.

Failure of the Contractor to submit As-Builts within 30 days of completion of the project and receive approval by the Engineer for the same shall result in 25% of the Construction Staking Bid Schedule line item being withheld from payment.

SP-9 of 10  

ADOT STANDARD SPECIFICATIONS FOR ROAD AND BRIDGE CONSTRUCTION

12’x7’ Precast CONCRETE BOX CULVERT

ADOT SECTION 601 FOR CONCRETE STRUCTURES

601-1 Description: of the Standard Specifications is modified to add the following: The 12’x7’ precast concrete box culvert shall be coordinated and scheduled with the Yuma County Water Users Association (YCWUA) and the Bureau of Reclamation ( BOR) for an irrigation dry-up period. The YCWUA has indicated they will provide a seven (7) day irrigation dry-up period for construction. The contractor is to request an outage, and provide a complete set of plans, shop drawings, and specifications to Yuma County, YCWUA and the BOR for their review and approval at least four (4) weeks prior to the proposed construction of the precast box culvert.

The BOR will turn off the water to the canal for no more than seven (7) days, after which they will return water back into the canal. The contractor is advised to include the time necessary for the water to recede or be pumped out of the canal within the dry up period as part of his construction operation. The contractor shall provide for a 10 cfs flow by the use of bypass pumping throughout the seven (7) day outage period.

The contractor will be required to construct a dam within the canal to provide a total dry up of the canal. The following relates to the work on the precast box culvert and precast wingwall construction only:

1. The contractor will be allowed to work any hours requested during the outage. The contractor is

allowed to construct the precast wingwalls and demolish portions of the existing bridge that do not adversely affect the water flow prior to the dry-up period.

2. The contractor may backfill against the precast concrete wingwalls after the concrete has

attained 3,000 psi compressive strength and the walls have been installed completely.

 3. The precast box culvert shall be designed by the contractor or the contractor’s

manufacturer in accordance with the AASHTO LRFD Bridge Design Specifications, 6th Edition or later. Structural calculations shall be supplied with the box shop drawings to Yuma County for review by the Engineer.

4. The contractor shall submit to the Engineer prior to commencing work, the equipment and pumping

data to be used to deliver the temporary irrigation flow. Approval must be secured before work commences.

5. The contractor shall also submit a progress schedule showing, in detail, the order in which all

work is to be performed before, during and after the canal dry-up period. The progress schedule shall be approved by the Engineer, Yuma County and the YCWUA prior to beginning any work on the project.

601-2.01 General: of the Standard Specifications is modified to add the following: Type II, Low "Alkali" or Type V cement is required.

601-5 Method of Measurement: of the Standard Specifications is modified to add the following: The quantity of precast concrete box culvert shall be measured to the nearest linear foot, as shown on the bidding schedule, installed in place, complete and accepted.

The quantity of the cast-in-place culvert headwalls, precast wingwalls and channel lining shall be measured as shown on the bidding schedule, installed in place, complete and accepted.

SP-10 of 10  

601-6 Basis of Payment: of the Standard Specifications is modified to add the following: Payment for the precast concrete box culvert, precast wingwalls, channel lining and cast-in-place culvert headwalls, measured as provided above, complete and in place, shall include full compensation for furnishing all labor, concrete, joint sealant, other materials, tools, equipment, incidentals, and accomplishing all work in conformance with the contract documents.

ATP 1 of 25 

Additional Technical Provisions

Yuma County County 17th Street at West Main Canal

Project CIP 1.1802 February, 2020

SECTION 321 ASPHALT CONCRETE PAVEMENT [REVISED JANUARY 07,2005]

321.1 Description

This section covers the placement of asphalt concrete as a surface course, base course and/or curb upon a previously prepared base or subgrade in accordance these specifications or as shown on the plans or ordered in writing by the Engineer.

321.2 Materials and Manufacture

Materials and manufacture shall conform with Section 710 of these Specifications for the type specified.

321.3 Weather and Moisture Conditions

Asphalt concrete shall be placed only when the surface is dry and when the atmospheric temperature in the shade is 40oF and rising. No asphalt concrete shall be placed when the weather is foggy, rainy or when the base on which the material is to be placed contains moisture is in excess of 2 percent above the optimum moisture content. Asphalt concrete shall be placed only when the Engineer determines that weather conditions are suitable.

321.4 Application of Tack Coat

A tack coat shall be applied to all existing and to each new course of bituminous surfaces prior to the placing of a succeeding layer of bituminous mixed material.

The tack coat may be deleted when a succeeding layer of asphalt concrete is being applied over a freshly laid course that has been subjected to very little traffic when approved by the Engineer.

ATP 2 of 25 

321.5 Placing, Spreading and Finishing Asphalt concrete shall be delivered and placed at a temperature within the job mix formula limits specified in Section 710. Tarpaulins shall be furnished and used to cover all loads during transportation if the temperature of the mixture is below the job mix formula limits specified in Section 710. The temperature shall be taken at a point 6 inches below the exposed surface of the material, in the truck, on the job site and just prior to placement. When releasing agents are placed in the truck beds, no free fluid shall be present in the truck bodies at the time of asphalt concrete loading. Diesel fuel shall not be used as a treating fluid.

The handling of the completed mixture shall at all times be such as to prevent segregation and the material as spread shall be free from areas of excess coarse or fine material.

Float rock developed in the process of raking shall be placed on an underlying course or otherwise disposed of. In no case shall it be scattered over the surface of a final course.

Placement shall begin on pavement at points farthest from the source of supply, and progress continuously toward the source of supply, unless otherwise ordered by the Engineer.

No more than ½ day's delivery to the project shall be placed in any one lane in advance of the other lanes. The end of each lane shall be staggered in relation to the adjacent lane.

At locations where the mixture is to be placed over areas inaccessible to the required spreading or compacting equipment or over areas where the use of the required spreading and compacting equipment would not be practicable, the mixture may be spread or compacted by other methods as approved by the Engineer.

321.5.1 Base Preparation The base prepared by the Contractor on which the asphalt concrete is to be placed shall be smooth, firm and true to grade and cross-section as shown on the plans and shall be so maintained throughout the period of placing asphalt concrete.

If necessary, in order to obtain the above specified base condition and if ordered by the Engineer, a leveling course of asphalt concrete compacted in layers not exceeding 2 inches in thickness or aggregate base shall be spread to level irregularities such as dips, depressions and sags. All irregularities such as humps or high spots shall be removed in order to provide a smooth base of uniform grade and cross-section so that subsequent surfacing will be of uniform thickness.

No additional compensation will be allowed for furnishing and placing these materials, and full compensation for all materials and for all work incidental to the correcting of irregularities will be considered as included in the contract price for asphalt concrete.

321.5.2(A) Spreading and Finishing Equipment Self-propelled mechanical spreading and finishing equipment shall be provided with a vibrating screed or strike-off assembly capable of distributing not less than the full width of a traffic lane.

The term screed includes any strike off device operated by tamping or vibrating action which is effective without tearing, shoving or gouging the mixture and which produces a course with a uniform texture and density for the full width being paved. Screeds shall be adjustable as to height and crown and shall be equipped with a controlled heating device for use when required. The forward speed of operation of self-propelled mechanical spreading and finishing equipment shall be so regulated that no irregularities will result in the surface texture or smoothness of the mat due to excessive forward speed of the spreading machine.

The forward speed of operation shall not exceed 55 feet per minute unless the Contractor can demonstrate to the satisfaction of the Engineer that higher speeds will not affect the smoothness of the mat.

ATP 3 of 25 

All material within the self-propelled mechanical spreading and finishing equipment shall be handled to prevent segregation of the aggregate. This includes, but is not limited to, devices such as augers, screws or slat conveyors. These devices shall extend to the final or termination point where the material is being transported within the equipment. If any of the devices fail to function the paving operation shall be terminated immediately until repairs are completed. In the case of the screed, auger extensions and vibrators shall be installed wherever the screed is extended more than one (1) foot beyond the end of the base auger or auger extension. However, when placing material against an extremely uneven curb or edge over a short distance, the Engineer may waive the auger extensions and vibrators.

Self-propelled mechanical spreading and finishing equipment shall be equipped with a control system capable of automatically maintaining the screed elevation as specified herein.

The control system shall be automatically actuated from either a reference line or surface through a system of mechanical sensors or sensor directed mechanisms or devices which will maintain the paver screed at a predetermined transverse slope and at the proper elevation to obtain the required surface. When directed, the transverse slope control system shall be made inoperative and the screed shall be controlled by sensor directed automatic mechanisms which will independently control the elevation of each end of the screed from reference lines or surfaces.

The controls shall be capable of working in conjunction with any of the following attachments:

(A) Ski-type device of not less than 30 feet in length.

(B) Taut string line or wire set to grade.

(C) Short ski or shoe.

The Contractor shall furnish the long ski, the short ski or shoe and all required stakes and wire required for the project. Should the automatic control system become inoperative during the day's work, the Contractor may be permitted to finish that day's work using manual controls; however, work shall not be resumed thereafter until the automatic control system has been made operative.

When trucks are backed into the self-propelled mechanical spreading and finishing equipment, it shall be in such a manner that the equipment will not be jarred excessively or moved out of line. Once in position, the truck shall be securely attached to the equipment during spreading and finishing.

When the Engineer deems that the automatic screed control operation is not practical under a particular set of conditions, he/she may order the use of manual control in lieu thereof. However, the machine shall be equipped with the automatic device.

Use of spreader boxes will be permitted by the Engineer only in writing, under certain conditions, such as in alleys and on narrow paving projects where it is not practical to use self-propelled equipment. The spreader box will be equipped with a readily adjustable strike off blade. In order to obtain a smooth surface, manipulation of the controls of the spreader box shall be held to a minimum. Trucks shall be backed into the spreader box in such a manner that the box will not be jarred excessively or moved out of line, and the trucks shall be securely attached to the spreader box during spreading and finishing.

If approved in writing by the Engineer, asphalt base course material may be placed with a self-propelled pneumatic tired blade grader equipped with an automatic leveling device capable of accurately maintaining transverse slope of the blade at a preset angle. Motor graders shall have a wheel base of not less than 16 feet and be equipped with a blade not less than 12 feet long. Motor graders shall be free from appreciable lost motion in the blade control.

ATP 4 of 25 

321.5.2(B) Compaction Equipment All rollers used in compaction of asphalt concrete shall be self-propelled and reversible, with a minimum weight of 8 tons. All rollers shall be maintained to ensure smooth operation in respect to steering, the ability to stop, start and reverse. All rollers shall be equipped with an automatic device or devices capable of properly dispensing an approved releasing agent on the wheels to prevent the wheels from picking up the asphalt concrete.

Diesel fuel shall not be used as a releasing agent. All rollers shall be equipped with scrapers to keep the wheels clean from asphalt and other debris.

Pneumatic-tire rollers shall be of the 2-axle tandem type, having a rolling width no less than 5 feet. All tires shall be no less than 20 inches in diameter, shall be of the same size and shall have treads satisfactory to the Engineer. The roller shall be so constructed that the operating weight per tire shall be no less than 2000 pounds and the tires shall be spaced so that the entire gap between adjacent tires will be covered by the tread of the following tire.

Except as otherwise specified, each tire shall be inflated to and maintained at 905 psi. Pneumatic-tired rollers shall be equipped with skirt-type devices mounted around the tires so that the temperature of the tires will be maintained during the rolling process.

Steel-wheel tandem rollers or vibratory rollers may be used where applicable. In all cases, the larger of the two roller wheels will be operated in the forward position. The steel wheels shall be straight, free from grooves and/or pits.

Vibratory rollers shall be operated in accordance with standard practices and manufacturer recommendations.

321.5.3 Leveling Course A leveling course shall be used when specified, or as directed in writing by the Engineer, to bring existing pavement to a uniform grade prior to placing an overlay or other course.

321.5.4 Asphalt Concrete Base and Surface Course Asphalt concrete base and surface courses shall be spread and finished by means of self-propelled mechanical spreading and finishing equipment as described and specified above, except as otherwise noted. The compacted thickness of layers shall not exceed 150% of the Design Target Lift Thickness of Table 710-1, except as otherwise provided in the plans and specifications, or if approved in writing by the Engineer.

The cross section of the asphalt concrete pavement shall be in accordance with Yuma County Construction Standards and as specified on the plans.

When more than one course is placed, longitudinal joints of each course shall be staggered not less than 6 inches with relation to the longitudinal joints of the underlying course.

Before a surface course is placed adjacent to cold transverse construction joints, such joints shall be trimmed to a vertical face by cutting (e.g., saw cut) the material back for its full depth to expose a fresh surface. The joint shall be cut on a 10 to 15 degree skew from a line perpendicular to the center line of the street or roadway. The joint formed when the fresh mixture is placed shall be dense and well-sealed. The transverse surface joints shall be tested with a 12 foot straightedge and shall conform to the requirements herein for surface smoothness. For short overnight intermissions in paving, a full depth bulkhead (e.g., wooden member) can be placed near the end of the day's pavement. The bulkheads and excess material will be removed just prior to the placement of the following day's pavement.

An approved joint heater shall be used on cold transverse or longitudinal joints where conditions are such that it is deemed necessary by the Engineer. The joint heater shall be capable of heating the joint to a minimum temperature of 200oF for a minimum depth of ¼ inch at a speed commensurate with that of the laydown machine.

If it is deemed necessary by the Engineer to seal the joints, a light coat of asphalt emulsion shall be applied to the exposed edge before the joint is made.

Sufficient rolling equipment shall be furnished to compact and finish satisfactorily the amount of mixture being placed. However, there shall be a minimum of two rollers with two (2) operators at all times. Upon direction of the Engineer, one of the rollers may be a pneumatic roller. During rolling operations, the speed of the roller(s) shall not exceed 3 miles per

ATP 5 of 25 

hour. If ample number of rollers are not present, the Contractor shall adjust the asphalt placement rate to accommodate the roller(s) speed.

The type and required number of rollers shall be on the project and in acceptable operation prior to the placement of any asphalt material. All rollers shall be operated continuously from the breakdown through finish rolling. The Contractor may use vibratory rollers in lieu of the steel-wheeled roller; however, when the thickness of the asphalt is one (1) inch or less all rolling will be done in the static mode.

When more than one width of asphalt concrete material will be placed, a 6 inch strip adjacent to the area on which future material is to be laid shall not be rolled until such material has been placed but shall not be left unrolled more than 2 hours after being placed, unless the 6 inch unrolled strip is first heated with a joint heater.

After the first strip or width has been compacted, the second width shall be placed, finished and compacted as provided for the first width, except that rolling shall be extended to include the 6 inches of the first width not previously completed.

At any place not accessible to the roller the mixture shall be thoroughly compacted with tampers and finished, where necessary, with a hot smoothing iron to provide a uniform and smooth layer over the entire area compacted in this manner.

Breakdown rolling shall begin as soon as the mixture will bear the roller without undue displacement. Rolling shall be longitudinal, overlapping on successive trips by at least 1/2 but not more than ¾ the width of the rear wheels. Alternate trips of the roller shall be of slightly different lengths. The motion of the roller shall at all times be slow enough to avoid displacement of the mixture.

Breakdown and compaction rolling shall be done by either steel-wheel or pneumatic-tire rollers. The Engineer may require a pneumatic-tire roller for one of the rolling operations. Rolling shall continue until the specific gravity of the compacted mixture is not less than 95 percent of the specific gravity of specimens composed of the same materials in similar proportions or composed of the same mixture compacted in the laboratory by the 75 blow method of AASHTO T-245.

Finish rolling shall be done by means of a steel-wheel roller or a vibratory steel-wheel roller operated in the static mode.

The completed surfacing shall be thoroughly compacted, smooth and true to grade and cross-section and free from ruts, humps, depressions or irregularities. An acceptable surface shall not vary more than ¼ inch from the lower edge of a 12 foot straightedge when the straightedge is placed parallel to the centerline of the roadway. The straightedge shall be furnished by the Contractor and shall be acceptable to the Engineer.

All streets shall be water tested for drainage in the presence of the Engineer or designated representative before final acceptance. Any areas not draining properly shall be corrected to the Engineer's satisfaction at the Contractor's expense. Water for this testing shall be provided and paid for by the Contractor.

When deviations in excess of the above tolerance are found, humps or depressions shall be corrected to meet the specified tolerance or shall be cut out along neat straight lines and replaced with fresh hot mixture and thoroughly compacted to conform with and bond to the surrounding area. Materials and work necessary to correct such deviations shall be at no additional cost to the Contracting Agency.

In order to alleviate the problem of raveling resulting from oil drippings between wheel paths of automobiles adjacent to stop lights, the surface of the Open Grade G-3/8 course shall be made denser by an application of sand at each traffic signal or stop sign on a major street.

The sand application shall be in the amount of 10 to 15 pounds per square yard, and shall be applied immediately after initial rolling of the Open Grade G-3/8 course and then rolled, concurrent with final rolling. The application shall extend through the intersection for the full width, and for 200 feet on each side of the centerline of the intersecting street. Throughout other areas a light application of 2 to 3 pounds of sand shall be applied, after final rolling, to minimize pickup by traffic. The grading for sand shall be as given in Table 321-1.

ATP 6 of 25 

TABLE 321-1 SAND GRADATION

Sieve Size Percent Passing No. 4 100 No. 8 90-100

No. 30 40-75 No. 200 0-10

321.5.5 Preservative Seal An asphalt concrete preservative seal shall be used on all new asphalt concrete pavement. The Engineer will make a field determination and provide the actual application rate or delete the requirement. This seal is not required for pavement matching and surface replacement over pipe trenches, etc. unless specified in the special provisions. There will be no separate payment for the preservative seal, its cost being considered included in the cost of the asphalt.

321.6 Testing

321.6.1 General In order to determine the gradation and asphalt cement percent of the asphalt concrete paving mix, a minimum of one sample for each site and each 100 ton on each of the binder and surface course mix shall be taken and tested according to ASTM Designation D6307 (Ignition Furnace). Sampling shall be done during the laydown operation. Compaction test shall be taken every 200 feet of roadway with at least two tests and in accordance with ASTM D-2950.

The specific gravity for a compaction test shall be no less than the specific gravity of specimens composed of the same materials in similar proportions or composed of the same mixture compacted in the laboratory by the 75 blow method of AASHTO T-245.

321.6.2 Density When, in the opinion of the Engineer, there is reason to believe that the compaction of the mixture is deficient, cores will be taken in the same pattern as that defined in first paragraph of this subsection, except that the figure 1 percent will be substituted for ¼ inch, and tested for specific gravity.

Where the compaction is deficient by 1 percentage point or less, it will be paid for at the contract price.

Where the compaction is deficient by more than 1 percent point, and the Contractor is unable to correct the deficiency, payment will be reduced per Table 321-2:

TABLE 321-2 PAVEMENT DENSITY PAYMENT REDUCTION (AC)

Deviation Below Specification Payment Reduction 2% points 2%

2 to 3% points 5% 3 to 5% points 10%

When the deviation is more than 5 percentage points, the Contractor shall place an overlay over the area involved as approved by the Engineer.

321.6.3 Asphalt Cement Content When the asphalt cement content exceeds the limits established in Section 710, two additional core tests will be made for each deficient test taken, and the average of all 3 tests made shall be used to determine the asphalt cement content.

When the asphalt cement content is in excess of that permitted, the Contractor shall remove any areas of bleeding, but in no case less than the specified roller width, as directed by the Engineer, and replace the affected material with new material meeting the specification requirements for the mix type involved. This shall be done, any time within a period of

ATP 7 of 25 

1 year until the bleeding has been corrected, at no additional cost to the Contracting Agency. Should the stability of the mix be affected by the excess asphalt cement to such an extent that the pavement is displaced under normal traffic loads, within a period of 1 year, the areas affected shall be removed and replaced with new material, at no additional cost to the Contracting Agency. When the asphalt cement content is from 0.0 to 0.2 percentage points by weight of the total mixed material less than the minimum permitted in Section 710, payment to the Contractor for asphalt concrete pavement will be reduced per Table 321-3.

TABLE 321-3

ASPHALT CEMENT CONTENT PAYMENT REDUCTION (AC) Deviation from that Permitted Payment Reduction

0.0 to 0.1% points 2% 0.1 to 0.2% points 5%

When the deviation is more than 0.2 percent points, greater than the permitted deviation, the Contractor shall place an asphalt chip seal using pre-coated chips complying with Section 330 over the area involved as approved by the Engineer.

The monetary compensation shown in Table 321-3 will apply when a public agency is the Contracting Agency. When the contract is directly with a party other than a public agency, as in the case of permits, etc., the following penalties apply in lieu of the monetary considerations listed in Table 321-3.

When the deviation is in the range of 0.0 to 0.2% points, not inclusive, greater than the permitted deviation, a separate absorption test shall be made to determine the proper application rate for the preservative seal for this specific section. The Engineer shall make the decision as to the rate of application for this section.

When the deviation is 0.2% points or more greater than the permitted deviation, the Contractor shall place an asphalt chip seal using pre-coated chips in accordance with Section 330 over the area involved as approved by the Engineer.

When the mineral aggregate gradation or plasticity index of the aggregate deviates from the requirements of this specification in an amount which, in the opinion of the Engineer, will affect the stability or durability of the mix, the Contractor shall, as directed by the Engineer, either remove the asphalt concrete and replace it with material which meets the requirements of this specification, or place an additional mat of such thickness and gradation as required by the Engineer which will, in the opinion of the Engineer, correct the deficiency.

The above corrective work, due to deviations from the requirements for mineral aggregate, shall be done at no additional cost to the Contracting Agency.

321.7 Corrective Requirements for Deficiencies

If there is reason to believe that the pavement may be deficient in thickness, at the option of the Engineer, cores will be taken at random locations, with one core for every 200 feet of lineal distance, with a minimum of one core between intersecting streets or portions thereof for each strip of paver width. When a deficiency of more than ¼ inch is found, two additional cores will be taken not closer than 50 feet apart nor closer than 50 feet to the original core, and the average of these three cores will be used to determine the amount of the deficiency.

Further cores may be taken by the Contractor if he so chooses to determine the limits of the deficiency and shall be at no additional cost to the Contracting Agency but shall not be used in determining the average thickness of the pavement.

Thickness of the cores shall be determined by average caliper measurement. Where pavement thickness is deficient by 1/4 inch or less, it will be paid for at contract price.

Where the pavement is deficient in thickness by more than ¼ inch but not more than ½ inch, payment will be reduced in accordance with Table 321-4.

ATP 8 of 25 

TABLE 321-4 PAVEMENT THICKNESS PAYMENT REDUCTION (AC)

Specified Mat Thickness Payment Reduction less than 1.50" 50% 1.50" to 1.99" 33% 2.00" to 2.49" 25% 2.50" to 2.99" 20% 3.00" and over 17%

When the deficiency of the pavement thickness exceeds ½ inch, the pavement shall be overlaid on the area affected, for the full width of pavement, with a new mat of material specified by the Engineer equal in thickness to the deficiency but not less than ½ inch in any instance. This is to be done at no additional cost to the Contracting Agency.

When the pavement is deficient in thickness by more than ¼ inch, all coring done to establish this premise shall be at the expense of the Contractor.

321.8 Curbs

Asphalt concrete curbs, when required on the plans, shall be placed by an approved extrusion type machine. In the event the Contractor wishes to utilize a template which varies from the cross-section shown on the plans, such change must meet the approval of the Engineer. Mineral aggregate shall be Dense Grade E-3/8, except that the asphalt cement content shall not be more than seven and one-half percent [7 ½ %] or less than seven percent [7%] by weight of the total mixture. One percent [1%] by weight of the total mixture shall consist of a granulated synthetic resin stiffener, Lexite or equal, complying with the following characteristics:

SOFTENING POINT (RING & BALL) ACID NUMBER

ASTM D-2398

ASTM D-465

210oF MINIMUM

LESS THAN 1.00

SAPONIFIABLE MATTER ASTM D-464 LESS THAN 1%

IODINE NUMBER

321.9 Measurement

ASTM D-29 175-185

(A) Asphalt concrete pavement will be measured by the square yard, computed to the nearest 0.5 of square yard, of the area actually paved as allowed above, which shall include the required quantities of mineral aggregates, filler material, asphalt cement and sand.

Measurement shall include construction of intersections, roadways, streets or other miscellaneous surfaces indicated on the plans or as directed by the Engineer.

The bid price per square yard for asphalt concrete shall include the cost of the asphalt cement in the percentages as specified in Section 710.

(B) Asphalt concrete curbs will be measured by the linear foot, parallel to the base or foundation, unless otherwise specified.

(C) Preservative seal for asphalt concrete pavement will be measured by the ton diluted, unless otherwise indicated in the special provisions.

321.10 Payment

ATP 9 of 25 

(A) The asphalt concrete measured as provided above will be paid for at the contract price per TON which price shall be full compensation for the item complete, as herein described and specified.

Payment for asphalt concrete curbs will be at the contract unit price bid per linear foot, which price shall be full compensation for the curb complete in place, including all necessary labor, equipment and material.

Except as otherwise specified in the special provisions, no separate payment will be made for work necessary to construct miscellaneous items or surfaces of asphalt concrete.

SECTION 404 STORM WATER POLLUTION PREVENTION PLAN [SWPPP]

404.1 General

This section is to be used by the Contractor to provide the required services of this work item.

404.2 Description of Work

This project is subject to the Arizona Pollutant Discharge Elimination System [AZPDES] storm water requirements for construction sites under the Environmental Protection Agency (EPA) General Permit for Discharge from Construction Activities [AZG 2003-001] for Arizona. Under provisions of that permit, the Contractor shall be designated a permittee and shall be responsible for providing the necessary labor and materials, and for taking the appropriate measures to assure compliance with the National Pollution Discharge Elimination System [NPDES] General Permit for Arizona as well as other Federal, state and local requirements pertaining to storm water discharges. As the permittee, the Contractor is responsible for completing, in a manner acceptable to the Arizona Department of Environmental Quality [ADEQ] and Yuma and County, all documents required by this regulation including the following:

(A) Stormwater Pollution Prevention Plan [SWPPP] for the project including certification form.

The contractor shall submit a copy of the SWPPP to the County 5 days prior to the pre-construction meeting for review. The Contractor will also be required to update and revise the SWPPP as necessary throughout the construction of the project subject to review by Yuma County Environmental Program Specialist, and Inspector, prior to implementation in order to assure compliance with ADEQ permit requirements. The completed SWPPP shall be kept on the project site at all times during construction of the project.

(B) Notice of Intent (NOI) to be covered under NPDES General Permit for Arizona including certification of signature.

(C) Notice of Termination (NOT) of coverage under NPDES General Permit for Arizona (upon project completion).

Preliminary copies of the NOI, Authorization Letter and SWPPP shall be submitted to the County five (5) days prior to the preconstruction meeting. The Contractor shall submit completed, signed NOI forms at least 48 hours prior to the initial start of construction on the project to ADEQ at the following address: Arizona Department of Environmental Quality Water Permits Section/ Stormwater NOI (541B-3) 1110 W. Washington Street Phoenix, AZ 85007 Or faxed to: (602) 771-4674

404.3 Notice Of Intent [NOI]

The contractor has the option of submitting the NOI online using the SMART NOI system at: http://az.gov/webapp/noi/main.do

Failure by the Contractor (or any of its appropriate subcontractors) to submit the NOI forms within the required time frame shall result in delay of the start of construction. The Contractor shall submit a completed copy of the NOI prior to Notice To Proceed [NTP]. A copy of the completed NOI shall be posted on the construction site along with the SWPPP.

ATP 10 of 25 

It is the Contractor’s responsibility to perform inspection of all stormwater pollution control devices on the project on a monthly basis and following each rainfall of 0.50 inches or more at the project site and as required under the NPDES General Permit for Arizona. The Contractor shall prepare reports on these inspections and retain these reports for a period of three [3] years following project completion as required under the NPDES General Permit for Arizona. Inspection reports shall be submitted monthly to the contracting agency. The Contractor shall maintain all storm water pollution control devices on the project in proper working order, including cleaning and/or repair during the entire duration of the project.

No condition of either the NPDES General Permit for Arizona or the SWPPP shall release the Contractor from any responsibilities or requirements under other environmental statutes and regulations.

Upon total project completion, acceptance, and de-mobilization, the Contractor shall submit a completed, signed Notice of Termination [NOT] form to the ADEQ with copies to the same agencies who received copies of the NOI, thereby terminating all NPDES permit coverage for the project.

Copies of necessary forms and guidance for preparing the SWPPP are available in the Drainage Design Manual for Maricopa County, Volume III Erosion Control. The Manual is available from the Flood Control District of Maricopa County, 2801 West Durango Road, Phoenix, AZ 85009 (602) 506-1501.

Additional information can be obtained at the Yuma County Environmental Programs Section. Please contact Rick Stacks, Environmental Programs Manager at (928) 817-5084.

404.4 Method Of Measurement and Payment

The Incidental price for the SWPPP shall include all material, labor and all other costs relating to the preparation, installation and maintenance of the SWPPP during construction, including proper operation of the pollution control devices installed, and all maintenance, cleaning, and disposal costs associated with clean-up and repair following storm events, runoff or releases on the project. The lump sum price for the SWPPP shall be inclusive of all costs, and no additional claims shall be made by the Contractor under any other specification provision of these documents, including changed conditions.

Fines and penalties imposed by the EPA or by ADEQ against the owner or the contractor for the contractor’s failure to comply with any of the requirements of NPDES General Permit of Arizona shall be borne by the contractor.

SECTION 451 TRAFFIC CONTROL [REPLACES SECTION 401] (REVISED DECEMBER, 2019)  451.1 DESCRIPTION:  The purpose of a Traffic Control Plan (TCP) is to encourage proper planning as to the time of day, sequence of construction, degree of restriction required, and temporary traffic control needed.  Traffic control shall consist of traffic control devices and flagmen or pilot cars. All traffic control devices, the application of traffic control measures, and traffic regulation in these specifications are to supplement and are not intended to delete any of the provisions of the Manual on Uniform Traffic Control Devices (MUTCD),  the Arizona Supplement to the MUTCD or any agency's Supplements to these Uniform Standard Specifications.  451.1.2 TRAFFIC CONTROL PLAN REQUIREMENTS: Traffic control plans are  to be  submitted by  the Contractor  for work undertaken  in County  right of way and  shall be  in compliance with the MUTCD latest edition and the Arizona Supplement to the MUTCD.  This submittal shall be part of the required  project  submittals  and  must  be  approved  by  Yuma  County  Engineering  Department  prior  to  commencing construction.    

ATP 11 of 25 

The traffic control plan includes the following components:  (a)  Traffic control plan.         Traffic Control plan must include detailed site plan showing signing, striping, barricading, detours, pedestrian walkways, 

bike lanes, construction fences, and project phasing.  (b)  Traffic control cover sheet.   The traffic control plan cover sheet includes additional requirements that are part of the traffic control plan. The traffic 

control cover sheet can be downloaded at:   https://www.yumacountyaz.gov/home/showdocument?id=41277  The Contractor’s Traffic Control Submittal shall be prepared by an individual meeting one of the following criteria:  (a) Has  successfully  completed  a  recognized  Traffic  Control  Supervisor  Training  and  Certification  program.  The  Traffic 

Control Supervisor Training and Certification provided by the American Traffic Safety Services Association (A.T.S.S.A.) or the  International Municipal  Signal  Association  (IMSA)  shall  be  acceptable.  Training  and  certification  through  other programs must be approved in advance by the Engineer. The individual’s training and certification shall be current and must be valid  throughout  the duration of  the project.  In order  to  remain current,  training and certification shall be completed or renewed at least once every four years.  

(b) Be a licensed Professional Engineer registered in the State of Arizona and have completed an approved Traffic Control Supervisor Training program. The training shall be current and must be valid throughout the duration of the project. In order for the training to remain current, it shall be completed or renewed every four years.  

The Contractor shall submit proof of the proposed individual’s credentials at the preconstruction conference. The Contractor bears all responsibility for any such contractor submitted control plan, whether prepared by its direct employee or other individual.  On most minor projects, the typical illustrations contained in the MUTCD or ADOT Supplement to MUTCD can be applied and constitute a pre‐approved TCP upon authorization from Yuma County Engineering Department.  451.2 TRAFFIC CONTROL DEVICES: Traffic control devices shall consist of providing, erecting, and maintaining necessary and adequate devices for the protection of the work, the workmen and the traveling public as approved by the Engineer. (a) Temporary traffic control devices shall be used to guide or detour traffic through or around construction areas. They include

traffic cones to channelize traffic, portable barricades for warning, vertical panel channelizing devices to divert traffic, and lighting devices between the hours of sunset and sunrise.

(b) Advance warning devices shall be used to alert the motorist of an obstruction in the roadway. They include diamond-

shaped signs, flags, and flasher type high level warning devices mounted 8 feet above the roadway. Signs, barricades, lights, arrow boards, message boards or other devices which, in the sole opinion of the Engineer, are in poor condition shall be removed and replaced with equipment that is in good condition. 

Equipment that is scratched, marred, discolored, bent, stained, set at incorrect height, or otherwise in poor condition as determined by the Engineer shall be removed and replaced with equipment in new or good condition as directed by the Engineer. 

The Contractor shall inspect all traffic control installations for the project at such regular times but not less than once every six (6) 

ATP 12 of 25 

hours day and night or as directed by the Engineer, and shall reset, replace, clean, adjust or otherwise maintain all traffic control in good condition for the use intended.  

All barricades, vertical panel, tubular markers, sign stands, or other equipment as appropriate, shall be sand bagged upon initial installation or relocation and re‐sand bagged as necessary or as directed by the Engineer.  Sand bags shall be of good, tightly woven cloth and shall be filled to a minimum of 75% of their capacity with clean sand free from objectionable material such as rock or concrete pieces.  Bags that are torn or sun rotted shall not be used and shall be removed from the project.  The use of asphalt or concrete pieces in lieu of sand bags is prohibited at all times.  Sand bags shall not be placed on the top of signs or barricades at any time. 

Minimum sand bagging requirements are one (1) sand bag for vertical panels, type II barricades (suspended bag), small sign stands, tubular markers, etc.   

Minimum sand bagging requirements for spring stands, type III barricades, large sign stands, etc. is two (2) sand bags per unit.  In any event or when so directed by the Engineer, the Contractor shall provide additional sand bags for traffic control equipment.   

The Contractor shall be prepared in advance of high wind events to respond immediately with additional sand bags for traffic control equipment.   

Elements of work which are lost, stolen, destroyed, or are deemed unacceptable by the Engineer, while in use on a project shall be replaced by the Contractor and, except as hereinafter specified for temporary  impact attenuation devices, at no additional cost to the County.  Sign sheeting shall be in accordance with ADOT standards, section 1007, and shall be orange prismatic sheeting. 

451.3 FLAGMEN OR PILOT CARS: Flagmen or pilot cars shall consist of providing sufficient flagmen, uniformed off-duty law enforcement officers or pilot cars to expedite the safe passage of traffic. Uniformed off-duty law enforcement officers shall be required for lane closures on two way roadways, where posted speed is 45mph or higher unless otherwise approved by Yuma County Engineering Department. 451.4 TRAFFIC CONTROL MEASURES: The application of all traffic control measures shall be based primarily upon the conditions existing at the time that such measures are deemed necessary. Prior to the start of any work that would interrupt the normal flow of traffic; sufficient and adequate devices and measures shall be provided and erected in accordance with the approved Traffic Control Plan or as directed by the Engineer. These devices shall be immediately removed when no longer needed. 451.5 GENERAL TRAFFIC REGULATIONS: A traffic lane shall be a minimum of 10 feet of clear street width with a safe motor vehicle operating speed of at least 25 miles per hour. Message boards will be required on major collector and arterial streets when a road closure will be conducted, the notice can be provided up to 14 days in advance of work. In addition, message boards will be required on arterial streets for the duration of the closure unless waived by the Engineer,

ATP 13 of 25 

Arrow Boards for lane closures will be required on multi-lane roads when lanes are fully closed at night. If two lanes are closed sequentially, an arrow board is required for the first one to get the drivers attention. An intersection shall be all of the area within the right of way intersection streets plus 300 feet beyond the edge of the intersected right of way on all legs of the intersection. A minimum of two traffic lanes, one for each direction, shall be maintained open to traffic at all times on all major streets. On multi-lane roads two or more lanes of traffic may be required depending on traffic conditions. All existing traffic lanes on major streets shall be maintained open to traffic at signalized intersections between the hours of 6:00 a.m. to 9:00 a.m. and 3:00 p.m. to 6:00 p.m. weekdays unless otherwise specified in the special provisions. Streets shall be maintained open to through traffic at all times unless approved by the Engineer.  The Contractor shall notify residents at least 48hrs in advance of work and coordinate with all businesses and residents to insure construction activities are scheduled and ingress/egress for deliveries and access to the properties shall be maintained. Access to cross streets or use of streets scheduled for improvement must be reasonably maintained during the work day and fully re‐established at the end of each work day.  A traffic lane shall not be considered as satisfactorily open to traffic unless it is paved with hot mix or cold mix asphalt paving if surrounded by or adjacent to existing pavement. Where pavement did not previously exist or where all of the existing pavement has been removed, a traffic lane shall not be considered as satisfactorily open to traffic unless it is graded reasonably smooth and maintained dust free as directed by the Engineer. The Contractor shall provide and maintain all necessary traffic controls to protect and guide traffic for all work in the construction area. The Contractor shall maintain all existing STOP, YIELD, and street name signs erect, clean, and in full view of the intended traffic at all times. If these signs interfere with construction, the Contractor shall temporarily relocate the signs away from construction but still in full view of the intended traffic. Existing traffic signs other than STOP, YIELD, and street name signs shall be maintained by the Contractor until such time as construction renders them obsolete or they are replaced. At that time the Contractor shall remove signs and posts without damage and deliver them as directed by the Engineer. Subject to the approval of the County Engineer, the Contractor shall furnish and install the 25 MPH Construction Zone Speed Limit Signs. The Contractor shall maintain the signs erect, clean and in full view of the intended traffic at all times. Should the signs interfere with construction, the Contractor shall relocate the signs as necessary. At any time project construction shall require the closure or disruption of traffic in any roadway, alley, or refuse collection easement such that normal refuse collection will be interfered with, the Contractor shall prior to causing such closure or disruption, make arrangements with the Sanitation Department in order that refuse collection service can be maintained. Shoulders used  to route  traffic are  to be watered  to control dust and are  to be graded a minimum of once a day.   The Contractor, at no additional cost to the County, is responsible for repairing any pavement edges or pavement surfaces which are damaged by related operations or the routing of traffic off of the pavement.  

Special traffic regulation are listed below: 1.- Road cannot be closed for traffic until July 13 of 2020, for Demolition of Existing road and Timber Bridge. 451.5.1 REIMBURSEMENT Exceptions A. Deficient Elements of Work Any deficiencies in the traffic control plan, devices, equipment, services, or other elements of work listed will be brought to the attention of the Contractor by the Engineer, and all deficiencies shall be corrected by the Contractor before the close of 

ATP 14 of 25 

that work shift, unless otherwise specified.  The Contractor will not be paid for those deficient elements of work listed unless restored to full usefulness prior to the close of the work shift in which notice of the defect is given.  Measurement for reimbursement will not resume until the beginning of the work shift following that work shift in which those elements are restored to usefulness.  B. Substantial Deficiencies For each work day or work  shift during which  there are, as determined by  the Engineer,  substantial deficiencies  in  the Contractor’s traffic control plan, devices, and/or services, no reimbursement will be made to the Contractor for any element of work listed.  Measurement for reimbursement will not resume for any element of work until the beginning of the work day or work shift following that work day or work shift in which all corrective measures have been performed by the Contractor and approved by the Engineer.  In cases of serious or willful disregard  for  the safety of  the public or  the Contractor’s employees by  the Contractor,  the Engineer may  place  the  traffic  control  elements  in  proper  condition  and  deduct  the  cost  thereof  from monies  due  or becoming due the Contractor.  C. Non‐diligent Prosecution of Work In the event that the Engineer determines that the Contractor's construction operations are not resulting  in the diligent prosecution of the work under contract, no reimbursement will be made to the Contractor for the elements of work listed until such time as the Engineer determines that the Contractor  is devoting appropriate efforts toward completion of the work.  Payment will be suspended effective with the end of the work day or work shift  in which written notice  is  issued to the Contractor by the Engineer notifying the Contractor of its failure to prosecute the work.  Payment will resume with the beginning of the work day or work shift following that work day or work shift in which the Engineer determines that satisfactory efforts are being made by the Contractor toward completion of the work.   In any case, the Contractor shall continue to be responsible for maintaining all barriers, attenuators, signs, lights and other traffic control devices in proper functioning condition at all times.  451.6 MEASUREMENT: No measurement will be made for traffic control devices. If listed in the bid schedule, flagmen, uniformed off-duty law enforcement officers or pilot cars, with driver, will be measured by the hour for each individual, including vehicle and equipment, required to perform traffic control. When an officer is used less than 3 hours, a minimum of 3 hours will be charged. Anything over 3 hours will be measured by the hour. No  reimbursement will  be made  to  the  contractor  for  the  elements  of work  listed  herein when  they  are  required  in association with construction work being performed after the expiration of the contract time and all approved extensions.  451.7 PAYMENT:  Payment for temporary traffic control shall be made by the lump sum items in the bid schedule, which will include all traffic control not paid separately, and will be paid as follows:  

ATP 15 of 25 

(a)  When the first Construction pay estimate is submitted, a payment of 25 (twenty‐five) percent of the Lump Sum price will be made. 

  (b)  For each progress payment thereafter, the remainder 75% of the line item shall be paid on a prorated basis based on the 

total dollar percentage completion of the project, not to exceed 100 (one–hundred) percent.  SECTION 710 ASPHALT CONCRETE [REVISED JANUARY 07, 2005]

710.1 General

Asphalt concrete shall be a mixture of asphalt cement and mineral aggregates. Mineral admixture and mineral filler shall be included in the mixture in accordance with section 710.2.3 of these specifications. All materials shall be proportioned by weight, volume or a combination in a central mix plant in the proportions required by the mix design to provide a homogenous and workable mass.

The asphalt concrete mixes shall be the types shown in Table 710-1.

TABLE 710-1

ASPHALT CONCRETE MIXES

Type

Application Design Target

Lift Thickness, in.

A 1-½ Base Course 4 B 1 Base Course 3 C ¾ Base or Surface Course 2 D ½ Surface Course 1-½ E 3/8 Surface Course 1 F 1-½ Base Course

Open-Graded Mixes 4

G 3/8 Surface Course Open-Graded Mixes

¾ to 1

Each mix can be designed for low or high traffic conditions.

Low traffic conditions are conditions where the asphalt mix will be subject to low volume and light weight vehicle usage. Residential streets are an example of low traffic conditions.

High traffic conditions are conditions where the asphalt mix will be subject to moderate to high volumes and/or heavy weight vehicle usage such as found on arterial streets.

710.2 Material

710.2.1 Asphalt The asphalt to be mixed with mineral aggregate shall be paving grade asphalt conforming to Section 711 and shall be PG 70-10 or PG 76-10 as directed by the Engineer, unless otherwise specified in the special provisions.

ATP 16 of 25 

710.2.2 Aggregate Coarse aggregate is material retained on the No. 4 sieve and fine aggregate is material passing the No. 4 sieve.

Coarse and fine aggregates, including blend sand, shall conform to the applicable requirements of Section 701 and Table 710-2.

TABLE 710-2 COARSE/FINE AGGREGATE REQUIREMENTS

Characteristics Low Traffic Conditions High Traffic Conditions

Fractured Faces, %

(Coarse Aggregate Only,

AZ Test Method 212D)

75.0, 1 or more

85.0, 1 or more

80.0, 2 or more

Un-compacted Voids, % Min

(AASHTO T-304, Method A)

40.0

45.0

Flat & Elongated Pieces, %

Max

1:5 Ratio (ASTM D-4791)

10.0

10.0

Sand Equivalent, % Min

(AASHTO T-176)

40.0

50.0

Plasticity Index

(AASHTO T-90)

Non-plastic

Non-plastic

Blend sand shall be clean, hard and sound material, either naturally occurring sand or crushed fines which will readily accept asphalt coating.

The exact grading requirements shall be such that, when it is mixed with the other mineral aggregate, the combined product shall meet the requirements of the designated mix as given in Table 710-3.

ATP 17 of 25 

710.2.2 Aggregate (continued)

TABLE 710-3 MINERAL AGGREGATE – PERCENT BY WEIGHT PASSING

Sieve Size

TYPE, DENSE-GRADED MIXES TYPE, OPEN- GRADED MIXES

  A 1-½ B 1 C ¾ D ½ E 3/8 F 1-½ G 3/8

  Base Course

Base or Single Course

Single Course

Single or Surface Course

Surface Course

Base Course

Surface Course

1-½ inch 100         100  

1 inch 80-100 100 100 100      

¾ inch 70-95 80-100 90-100 97-100   50-90  

½ inch - - 65-85 75-100 85-100   - -  3/ inch

8 50-65 55-75 65-90 70-90 100 - - 100 No. 4 35-50 40-60 45-70 50-75 65-85 0-20 25-70 No. 8 25-40 25-45 30-55 35-65 45-70 - - 0-10 No. 30 10-25 10-30 15-35 20-40 20-40 - - - - No. 100 - - - - - - - - 5-15 - - - - No. 200 2-8 2-8 2-8 2-8 3-8 0-5 0-4

The combined aggregates sampled after all processing, without the mineral filler, shall have a ratio of the percentage of aggregate by weight passing the No. 30 sieve, to that passing No. 8 sieve of 65 percent or less in all dense graded asphalt concrete mixes. . 710.2.3 Mineral Filler and Anti-Stripping Agent Mineral filler shall conform to the requirements of AASHTO M-17. The mineral filler shall be dry hydrated lime conforming to the requirements of ASTM C-207 Type N or Portland Cement conforming to Section 725 or other approved mineral filler and shall be added to the aggregate in accordance with the requirements contained herein.

The amount of mineral filler to serve as mineral admixture for anti-stripping purposes shall be approximately 1.5 percent hydrated lime or 2.0 percent Portland Cement by weight of the mineral aggregate.

The method of adding the mineral filler shall be such that the aggregate is uniformly coated and the mineral filler is uniformly distributed without loss or waste within the material prior to adding the asphalt to the mixture. Mineral admixture shall be added in accordance with the method given within the mix design.

710.3 Mix Design Requirements

710.3.1 General Unless otherwise authorized by the Engineer no work shall be started on the project nor any mixture accepted therefore, until the Contractor or his supplier has submitted samples of the materials intended for use and the Contractor has submitted a satisfactory mix design based upon tests of the materials furnished.

The mix design shall be prepared under the direct supervision of a professional engineer experienced in the development of mix designs and mix design testing.

The date of the design shall not be older than one year from the date of submittal, unless supportive documentation is provided and approved by the Engineer.

ATP 18 of 25 

The mix design report shall include the following elements: (1) The mix plant location and a description of all products that are incorporated in the asphalt concrete along

with disclosure of the sources of all products, including mineral admixtures, anti-stripping agents and their method of introduction.

(2) The results of testing performed on all aggregates to assure compliance with Section 701 and 710. (3) The results of all laboratory tests associated with the mix design development, a plot of the gradation on the

Federal highway Administration's 0.45 Power Gradation Chart, plots of all compaction curves and the results of the moisture damage testing.

(4) Specific recommendations for the definite percentage for each sieve fraction of aggregate, design asphalt content and any limiting conditions that may be associated with the use of the design, such as minimum percentages of crushed or washed fine aggregate.

(5) Mixing and compaction temperatures. (6) The supplier's product code, the laboratory Engineer's seal (signed and dated), and the date the design was

performed. 710.3.2 Mix Design Criteria The mix design shall be performed by the Marshall Mix Design method. A minimum of 4 points will be used to establish the mix design results. The mix design shall be performed in accordance with the requirements of The Asphalt Institute's Manual, MS-2 "Mix Design Methods for Asphalt Concrete."

The mix shall utilize the compactive effort described in AASHTO T-245, "Standard Method of Test for the Resistance to Plastic Flow of Bituminous Mixtures Using Marshall Apparatus."

The mix shall comply with the criteria in Table 710-4.

TABLE 710-4

MARSHALL MIX DESIGN CRITERIA Characteristics Criteria

Compactive Efforts, Blow per Specimen Face 75 Marshall Stability, lb 2,000 Minimum

Marshall Flow, 0.01 in. 8 - 16

Effective Air Voids, % 3.50.2 (Light Traffic)

4.00.2 (Heavy Traffic) Voids in Mineral Aggregate, % Table 710-6

Voids Filled with Asphalt, % 70-80 (Light Traffic)

65-75 (Heavy Traffic)

The mix design asphalt content shall be within the following range of the percentages of the total mixed material.

TABLE 710-5 ASPHALT CONTENT RANGE (%)

Mix Designation Range A 1-½ 4.0 to 5.0

B-1, C ¾ 5.0 to 6.0 D ½, E 3/8 5.5 to 6.5

F 1-½ 4.5 to 6.0 G 3/8 6.0 to 7.0

ATP 19 of 25 

The voids in the mineral aggregate shall comply with the criteria in Table 710-6.

TABLE 710-6 VOIDS IN MINERAL AGGREGATE (%)

Mix Designation Minimum VMA

A 1-½ 11 B-1 12

C ¾, D ½ 13

E 3/8 15

The dust proportion is defined as the ratio of the percent finer than the No. 200 sieve, including mineral filler and mineral admixture, to the effective binder content. The dust proportion shall be between 0.60 and 1.4 at the mix design asphalt content.

710.3.3 Moisture Sensitivity The resistance to moisture damage shall be evaluated in accordance with ASTM D-1075 "Test Method for Effect of Water on Compressive Strength of Compacted Bituminous Mixtures." A minimum dry strength of 250 psi and a minimum retained wet strength of 70 percent of the dry strength shall be achieved at the mix design asphalt content.

710.4 Production Requirements

710.4.1 Quality Control Quality control shall be the responsibility of the Contractor or his supplier. The Engineer reserves the right to obtain samples of any portion of any material at any point of the operations for his/her own use. Also, the Engineer reserves the right to order the use of any drying, proportion and mixing equipment or the handling of any material discontinued which, in his/her opinion, fails to produce a satisfactory mixture.

The asphalt concrete mix produced shall conform to the properties of the mix design. When the asphalt concrete mix does not conform to the approved mix design properties, the production shall immediately cease.

710.4.2 Handling and Storage of Aggregate Aggregate shall be stockpiled so that there is no harmful segregation and/or contamination. Dividers of sufficient size to prevent intermingling of stockpiles shall be provided. This may be accomplished by sufficient separation of stockpiles.

Any method of handling or moving the material which may cause the segregation, degradation, contamination or the combining of material of different gradings or stockpiles shall not be permitted. The affected material will be reprocessed or discarded.

710.4.3 Proportioning The Contractor or his supplier shall provide documentation by calibration charts or other approved means showing the mineral aggregate, asphalt cement, mineral admixture, mineral filler or anti-stripping agent are being proportioned in accordance with the approved mix design.

One set of documentation shall be provided for each 100 tons produced; however not less than one per each time the plant is placed in production. All measuring devices shall be calibrated at least annually by a technician licensed by the Arizona Bureau of Weight & Measures. Copies of the calibration documentation shall be an integral part of the mix design approval process which, if not acceptable, could be cause for rejection of the entire submittal.

If a mineral admixture or anti-stripping agent is added in a drum mix plant, a positive signal system and a limit switch device shall be installed in the plant at the point of introduction of the admixture. The positive signal system shall be placed between the metering device and the mixing drum and utilized during production whereby the mixing shall be stopped automatically if the admixture is not being introduced into the mixture.

ATP 20 of 25 

No fine material, which has been collected in the dust collection system, shall be returned to the mixture unless the Contractor or his supplier propose in writing to utilize a specific portion of the fines and it is approved, in writing, by the Engineer. If used, the fine material shall be metered at a uniform rate into the mixture.

When mineral filler is added to the asphalt mix, it shall be added prior to the asphalt cement. Also, the method of adding the mineral filler shall produce a uniform distribution without loss or waste of the material within the mixture. The amount of mineral filler shall be determined by the mix design.

Hydrated lime or Portland Cement added as a mineral admixture or anti-stripping agent, shall be added by a method that the aggregate will be uniformly coated. The manner in which the lime or cement is incorporated into the mineral aggregate shall be given by the mix design.

When mineral aggregate, asphalt cement, mineral filler, mineral admixture and/or anti-stripping agent are proportioned by weight, the scales used in batching the materials, all boxes, hoppers, buckets or similar receptacles used for weighting materials, shall be insulated against the vibration or movement from the rest of the plant. Errors in weighing, while the entire operation is running, shall not exceed two percent [2%] for any setting nor one and one-half percent [1 ½%] for any batch. The asphalt shall be weighed in a heated, insulated bucket suspended from a springless dial scale or load cell system. Other required materials shall be added separately and in a thoroughly dry condition.

When mineral aggregate, asphalt cement, mineral filler, mineral admixture and/or anti-stripping agent are proportioned by volume, the correct portion of each mineral aggregate size introduced into the mixture shall be drawn from the storage bins by an appropriate type of continuous feeder. The feeder shall supply the correct amount of mineral aggregate in proportion to asphalt cement. Furthermore, the feeder shall allow each mineral aggregate size to be adjusted separately. The continuous feeder for the mineral aggregate shall be mechanically or electrically actuated.

If fine material sticks to the sides of the bin, the bin shall be equipped with a vibrating unit which will effectively vibrate the side walls of the bin and prevent any hang up of material while the plant is operating.

All scales or temperature devices shall be so located that the mixer operator and plant inspector have an unobstructed close-up-view of the indicating or registering devices. The scales shall indicate the true net weight without the application of any factor. The dial for dial type scales shall not be less than 12 inches in diameter and the figures thereon shall be clearly legible.

710.4.4 Drying and Heating The mixing plant shall be proved with accurate mechanical means for feeding the aggregates from the stockpiles or bunkers into the dryer at such a rate that a uniform production and temperature of dried aggregates will be obtained. Drying and heating shall be accomplished in such a manner as to preclude the mineral aggregate from becoming coated with fuel oil or carbon.

A recording pyrometer or other approved recording thermometric instrument, sensitive to a rate of temperature change not less than 10oF per minute, shall be placed at the discharge chute of the dryer to automatically record the temperature of the asphalt concrete or mineral aggregate. When requested, a copy of the recording shall be given to the Engineer at the end of each shift. The mixing temperature of the asphalt mix shall not exceed 10oF of the mixing temperature stated on the approved mix design. Heating of filler material will not be required.

Drying shall be to the extent that the moisture content of the asphalt concrete mix, when placed on the grade immediately behind the paver, shall not exceed one half of one percent (0.5%). The moisture content shall be determined in accordance with Arizona Test Method 406.

The dryer shall be equipped with a dust collector system capable of removing objectionable or excess dust from the aggregate in order to comply with applicable laws and ordinances.

ATP 21 of 25 

710.4.5 Mixing The production of the plant shall be governed by the rate required to obtain a thoroughly mixed and uniform blend of the materials not to exceed the rated capacity of the plant. Mixing shall continue until the uniformity of coating, when tested in accordance with the requirements of AASHTO T-195, is at least 95 percent.

The mineral aggregate, asphalt cement, mineral filler, mineral admixture and/or anti-stripping agent shall be mixed at a central mixing plant of the batch type mixer, continuous type mixer or drum type mixer as the Contractor or his supplier may elect. The plant shall be maintained and operated in accordance with the manufacturer's recommendations.

Pug mill mixers shall be of a twin-shaft type and shall be operated at the speed recommended by the manufacturer. They shall be equipped with paddles of sufficient size and number to deliver a thorough and uniform mixture. Should the paddles or other parts of the pug mill become worn to such extent as to adversely affect the quality of the mixing or allow leakage from the discharge gate, such parts shall be promptly replaced.

The amount of asphalt cement to be added to the mineral aggregate shall be as specified in the mix design. The asphalt shall be added at the temperature specified in the mix design or in Section 711.

The asphalt pump shall be a positive displacement type pump. The use of a pressure relief valve will not be permitted. The plant shall be equipped with an indicating meter between the pump and spray, and the meter shall be in good working condition and accurately record the volume of the material pumped. All pipes, bins, fittings and meters shall be steam jacketed or otherwise properly insulated. The asphalt storage system shall be equipped with a device for automatic plant shut-off when the intake of the positive displacement pump is not working under positive pressure. Sampling ports shall be installed at the discharge end of the metering device for use by the Engineer in obtaining samples of the material.

A positive signal system shall be provided to indicate the low level of mineral aggregate in the bins of the batch plant and as the level of material in any one bin approaches the strike off capacity of the feed gate, the device will automatically and promptly close down the feed of all materials to the mixer. The plant will not be permitted to operate unless this signal system is in good working condition. Each bin shall have an overflow chute and dividers to prevent material from spilling into adjacent bins.

The temperature of the asphalt concrete upon discharge from the mixer shall not exceed the maximum mixing temperature specified in the mix design. If the asphalt concrete is discharged from the mixer into a hopper, the hopper shall be constructed so that there is no harmful segregation of the asphalt concrete

710.4.6 Temporary Storage of Bituminous Mixture Use of surge bins or storage bins for temporary storage of hot bituminous mixtures will be permitted. The bituminous mixture may be stored in insulated and heated storage bins for a period of time not to exceed 12 hours. If the Engineer determines that there is an excessive amount of heat loss, segregation and/or oxidation of the mixture due to temporary storage, use of surge bins or storage bins will be discontinued.

710.4.7 Plant Inspection Each hot mix asphalt facility, producing under this specification, shall be inspected biannually by a Civil Engineer registered in the State of Arizona and knowledgeable in batch plant operation. The Civil Engineer shall be independent and not an employee of the Contractor or the supplier. This inspection shall be performed in accordance with the "Certification of Hot Mix Asphalt Production Facilities" by the Arizona Rock Products Association. A copy of the current certification shall be an integral part of the mix design which, if found unacceptable, could be cause for rejection of the entire submittal.

710.5 Transport and Delivery Requirements

The beds of the trucks utilized to transport asphalt concrete shall be coated with a release agent. The release agent shall be certified to be non-reactive with the bituminous material. If, in the opinion of the Engineer or plant operator, there is an excess of release agent applied to the truck bed, the driver will be required to raise the bed and drain off the excess agent. Diesel fuel will not be acceptable as a releasing agent.

ATP 22 of 25 

Mixtures shall be delivered to the site of the work without segregation of the ingredients and within the temperature range specified in Section 321.

At the time of delivery to the job site, the Engineer shall be provided with a legible delivery ticket that has the weight of the material from a measuring device, which has been certified by the Arizona Department of Weights and Measures.

The delivery ticket shall contain the following information:

(1) Date;

(2) Supplier's name;

(3) Plant location and/or plant number;

(4) Ticket number;

(5) Truck number;

(6) Contractor's name;

(7) Project name and/or location;

(8) Production code/description with percent asphalt;

(9) Mineral filler/additive and/or anti-stripping agent and percent;

(10) Temperature at batching;

(11) Times of loading, arrival on job and unloading;

(12) Material weight or vehicle weight with and without material; and

(13) Weight of accumulative loads.

710.6 GENERAL REQUIREMENTS

The material furnished shall conform to the approved mix design within the tolerances specified herein in Table 710-7.

TABLE 710-7 MIX DESIGN TOLERANCES

Aggregate Passing No. 4 Sieve and Larger 6 Percent Aggregate Passing No. 8 and No. 30 Sieves 6 Percent

Aggregate Passing No. 200 Sieve 2 Percent Asphalt Content 0.4 Percent

Temperature for Mixing and Placing 25oF

A temperature indicating device reading to 500oF and accurate to 5oF shall be fixed in the asphalt line or storage tank at a suitable location.

The temperature of the mixture when discharged into the hauling vehicles shall not vary more than 30oF for successive batches. The discharge end of the asphalt binder circulating pipe shall be maintained below the surface of the asphalt binder in the storage tank to prevent discharging hot bituminous binder into open air.

ATP 23 of 25 

The contractor shall provide a suitable sampling outlet in the asphalt feed lines connecting the plant storage tanks to the asphalt weighing system or spray bar. The sampling device shall consist of a ½ inch or ¾ inch valve constructed in such a manner that a one gallon sample may be withdrawn slowly at any time during plant operations. The valve shall be maintained in good condition and if it fails to function properly, it shall be replaced. The sampling device shall be placed in a location that is readily accessible and in an area free of dangerous obstructions. A drainage receptacle shall be provided for flushing the devices prior to sampling.

SECTION 711 PAVING ASPHALT [REVISED JANUARY 07, 2005]

711.1 General

The asphalt shall be produced from crude asphalt petroleum or a mixture of refined liquid asphalt and refined solid asphalt. It shall be free from admixture with any residues obtained by the artificial distillation of coal, coal tar, or paraffin oil and shall be homogeneous and free from water.

Asphalt shall not be heated during the process of its manufacture, storage, or during construction so as to cause injury as evidenced by the formation of carbonized particles.

711.2 Testing Requirements

Paving asphalt shall be classified by viscosity and shall conform to the requirements set forth in Table 711-1.

TABLE 711-1

PERFORMANCE GRADING SYSTEM   PG 64-10 PG 70-10 PG 76-10 PG 82-10 Original Asphalt

Viscosity, ASTM D 4402 (1), Max. 3 Pa-s, Test Temp, oC (°F)

135 (275)

135 (275)

135 (275)

135 (275)

Dynamic Shear TP5 (2), G*/Sin , Min., 1.00 kPa, Test Temp. @ 10 rad/s, oC (°F)

64 (147)

70 (158)

76 (169)

82 (180)

Rolling Thin Film Oven Residue (AASHTO T240)

Dynamic Shear TP5, G*/Sin , Min., 2.20 kPa, Test Temp. @ 10 rad/s, oC (°F)

64 (147)

70 (158)

76 (169)

82 (180)

Pressure Aging Vessel Residue (AASHTO PP1)

PAV Aging Temperature, oC (°F) 110 (230) 110 (230) 110 (230) 110 (230) Dynamic Shear TP5, G*Sin , Min., 5000 kPa, Test Temp. @ 10 rad/s, oC (°F)

31 (88)

34 (93)

37 (99)

40 (104)

On all Grades Flash Point Temperature T48: Minimum 230oC (446°F) and Mass Loss, Maximum 1.00 percent.

(1) This requirement may be waived at the discretion of the specifying agency if the supplier warrants that the asphalt binder can be adequately pumped and mixed at temperatures that meet all applicable safety standards.

(2) For quality control of unmodified asphalt cement production, measurement of the viscosity of the original asphalt cement may be substituted for dynamic shear measurements of G*/sin() at test temperatures when the asphalt is a Newtonian fluid. Any suitable standard means of viscosity measurement may be used, including capillary or rotational viscometry (T210 or T202).

7

ATP 24 of 25 

Design Note: Performance Grade Asphalts are selected for certain reliabilities with respect to high and low pavement temperatures. The specified characteristics are based upon a loading frequency that approximates vehicle speeds of approximately 56 mph [90 km/hr]. Since all binders are frequency dependent, the designer may consider increasing the high temperature requirement for slow transient and standing loads, such as intersection loading. The high temperature requirement may also be increased for excessive numbers of equivalent single axle loads.

711.3 Test Report and Certification

At the time of delivery of each shipment of asphalt, the supplier supplying the material shall deliver to the purchaser 3 certified copies of the test report which shall indicate the name of the refinery and supplier, type and grade of asphalt delivered, date and point of delivery, quantity delivered, delivery ticket number, purchase order number, and results of the above specified tests. The test report shall be signed by an authorized representative of the supplier certifying that the product delivered conforms to the specifications for the type and grade indicated.

Until the certified test reports and samples of the material have been checked by the Engineer, that material will be only tentatively accepted by the Contracting Agency. Final acceptance will be dependent upon the determination of the Engineer that the material involved fulfills the requirements prescribed. The certified test reports and the testing required in connection with the reports shall be at no additional cost to the Contracting Agency.

711.4 Temperatures

Unless otherwise specified in these specifications or in the special provisions, the various grades of paving asphalt shall be applied within the temperature range indicated in Table 711-2. The exact temperature shall be determined by the Engineer.

At no time, after loading into a tank car or truck for transportation from the refinery to the purchaser, shall the temperature of the paving asphalt be raised above 400 degrees F.

erature

Paving asphalt shall be heated in such a manner that steam or hot oils will not be introduced directly into the paving asphalt during heating.

711.5 Distributing Equipment Distributing Equipment shall meet the requirements of Section 330.

711.6 Conversion of Quantities

When pay quantities of paving asphalt are determined from volumetric measurements, the volumetric measurement at any temperature shall be reduced to the volume the material would occupy at 60 degrees F. in accordance with ASTM D-1250. In converting volume to weight, the computations shall be based on Table 711-3.

TABLE 711-2

APPLICATION TEMPERATURE OF PAVING ASPHALTS

Grade of Material

Pug Mill Mixing Asphalt Temperature

°C (oF)

Distributor Application Temperature

°C (oF)   Minimum Maximum Minimum Maximum

PG 64-10 135 (275) 163 (325) 149 (300) 199 (390)

PG 70-10 135 (275) 163 (325) 149 (300) 199 (390)

PG 76-10 143 (290) 171 (340) 154 (310) 199 (390)

PG 82-10 143 (290) 171 (340) 157 (315) 199 (390)

Distributor Application Temperature

°C (oF) 

ATP 25 of 25 

TABLE 711-3

PAVING ASPHALT QUANTITY CONVERSION

Grade of Material Gallons Per Ton at 60°F

(15.5°C) Lbs. Per Gallon at 60°F

(15.5°C)

PG 64-10 235 8.5

PG 70-10 235 8.5

PG 76-10 230 8.7

PG 82-10 230 8.7

AP 1 of 2 

Additional Provisions

Yuma County County 17th Street at West Main Bridge Replacement

Project CIP 1-1802 February, 2020

   1.   Bridge Replacement  The Yuma County Water Users Association has a scheduled outage  (canal draw down) for this main canal.   The outage will last up to 7 days, Scheduled from August 3, 2020 to August 9, 2020.  However, the Contractor will need to be able to provide an irrigation bypass during the outage of 10 cfs. The week following the outage is scheduled to have a restricted flow of 40 cfs, but is subject to cancellation. The normal flow for the canal is 140 cfs.   Testing of the installed culvert and structures will be as per hydrostatic test for new irrigation culverts, pipelines, gates, concrete collars and precast  tees and crosses,  in accordance with Yuma County Water Users Association requirements.  Test will be declared satisfactory if no leakage is observed to any of the new irrigation facilities when the main canal is flowing at capacity.  Contractor shall repair any leaks observed.  The following relates to the work on the West Main Canal reconstruction only: a.  The contractor will be allowed to work any hours requested during any draw down period, if any. b.  The contractor may remove forms from portland cement concrete after the concrete has attained 3,000 

psi  compression  strength.   All  references which  refer  to minimum  time,  for  form  removal  are hereby deleted. 

c.  The contractor may backfill against  the concrete after  the concrete has attained 3,000 psi compressive strength. 

d.  The contractor shall submit to the Engineer prior to commencing work, the equipment and pumping data to be used to deliver the temporary irrigation flow, if work is to be performed outside of any drawdown.  Approval must be secured prior to the start of work. 

 2.   OVERHEAD LINES The contractor's attention is called to the existence of overhead lines within, crossing and adjacent to the project.  The Contractor at all times shall maintain the proper, safe,  legal clearances to all overhead  lines as required by federal, state, and local regulations.  The Contractor will maintain a minimum of 5 feet of lateral clearance around the base of overhead line poles which are located at the top of cut slopes.  If work is done within the 5 feet lateral distance, then the pole shall be properly braced.   

AP 2 of 2 

  3.   SURVEY MONUMENTS The Contractor and his Surveyor are advised that restoration or establishment of public land corners as required by Arizona Revised Statutes 33‐106  requires  the monument be  filed with  the County Recorder.   The Contractor  is required to provide copies of the filing record to the Engineer.  Failure of the Contractor or his surveyor to properly file on monuments and to provide copies of the filing documentation to the Engineer will result  in the Engineer having the work done and the cost thereof deducted from the contract.  4.   CONTRACTOR PARTICIPATION Yuma County Public Works  Standards, Volume  II  (specifications),  Section 108.3(E) of  the General Provisions  is revised  to  indicate  the  "Contractor  shall perform with his own organization, work amounting  to not  less  than twenty‐five percent (25%) of the total contractor cost.  5.   BRIDGE DEMOLITION The Contractor cannot Demolish Existing road and/or Timber Bridge until July 13 of 2020.