Pavement_IDIQ_SOW_10_Nov_16.pdf

Exhibit “A”, Scope of Work Page 1 of 19 379 Air Expeditionary Wing Revision 0 Issued for Requisition, dated XX-XX-20XX

ATTACHMENT A

STATEMENT OF WORK (SOW)

PAVEMENT IDIQ

1.0 Background and General Requirements

The primary purpose of this Indefinite-Delivery Indefinite-Quantity (IDIQ) contract is to obtain bulk asphalt and aggregate delivery and associated construction for Al Udeid Air Base, Qatar. All other requirements listed in the

Statement of Work (SOW) are secondary and not guaranteed. This type of contract is intended for use of funded programs and projects managed by Al Udeid Air Base (AUAB), Qatar. Task orders will be issued based on the individual task order requirements.

This contract will be awarded for a three year period upon award.

A portion of the AUAB is maintained and operated for 379 Air Expeditionary Wing (AEW), with other US and multi-national tenant units under the stewardship of Military, Civilian Service and Civilian personnel whom maintain and operate on pavement systems.

Scope Responsibilities:

I. Furnish and install demolition, grading and site-development

II. Furnish and install bulk materials

III. Furnish and install asphalt pavement surfaces

IV. Furnish and install sampling and testing of materials

VI. Furnish and install pavement marking and striping

VII. Furnish and install milling operations and traffic control devices

VIII. Furnish and install miscellaneous horizontal services

1.1 Location Overview

The work is located at Al Udeid Air Base (AUAB), a military base southwest of Doha, Qatar.

Military and Contracted civilian personnel perform daily operations and maintenance. At no time shall the IDIQ

Awardee operate the pavement systems, unless given prior approval from the 379 Air Expeditionary Wing (AEW) designated representative.

1.2 Climate Overview

The climate of the State of Qatar, located in Southwest Asia, is a dry, subtropical desert type climate. With low annual rainfall and intensely hot and humid summers, the varying summer temperatures from May to October range from 35

C (95 F) to 48.3 C (119 F. Typically, humidity ranges from 18% to 94% throughout the course of the year. Rainfall is seasonal, with June to September being the drier months. Conversely, November to March experiences increased precipitation. The average annual rainfall figures for Doha, Qatar are 75.2mm (3”) per year.

1.3 Contract Overview

It is anticipated that a wide variety of construction activities will be included in the execution of this contract. A number of these types of activities are listed below; however, additional line items are defined in the schedule of values document (costing sheet).

Asphalt:

Provide all labor and materials and equipment to support construction, maintenance and repair of hot-mix asphalt pavement; including base course and other aggregates. Materials may also be used to construct, maintain, and repair the Airfield, roadways, parking lots, and other miscellaneous asphalt paving projects.

Exhibit “A”, Scope of Work Page 2 of 19 379 Air Expeditionary Wing

Bulk Gravel:

Provide all labor and materials and equipment to support construction and maintenance of gravel yards; including material handling equipment necessary for bulk delivery of crushed gravel, graded-crushed aggregate base course, ballast, riprap, sand, pea gravel, and other aggregates.

Other Construction:

Provide all labor, services, materials, tools, equipment, mobile batch plant, machinery, supplies, transportation, delivery, storage, expertise, supervision, management, engineering, quality control, testing, communication, security, safety, and all other items and services as necessary to complete Task Orders. Contractor will provide all signs/barricades.

1.4 Geotechnical Information

The CONTRACTOR shall assist with the foundation designs as required, based on typical soil makeup common to the area.

1.4.1 Electrical

CONTRACTOR is to utilize existing 50/60 Hz electrical infrastructure (480/277V and 208/120V 3-phase electrical systems on site).

2.0 Task Order Overview

The GOVERNMENT shall approve technical input for selecting equipment and skilled manpower to correctly install

Task Order requirements, as proposed by the CONTRACTOR. The CONTRACTOR is responsible for all logistics involved in transporting, disposal, etc. of new and old equipment and material.

3.0 General Requirements

3.1 Workmanship and Warranty

The CONTRACTOR shall provide all labor, materials, tools, equipment, supervision and all other items as necessary to complete the Work as described in the SOW. The CONTRACTOR shall conduct all work in a professional manner, in accordance with techniques described in this document. All work shall have a one year warranty period valid from date of project acceptance.

3.2 Equipment

The CONTRACTOR shall ensure that all equipment supplied and installed are in an operable condition at the completion of this project. CONTRACTOR shall provide all fuel, oil, spare parts, tools and labor for all Task Orders.

Any broken or damaged equipment will be fixed immediately or replaced with new at no additional cost to the

GOVERNMENT.

3.2.1 CONTRACTOR’S delivery vehicles shall maintain a functional level of maintenance and safety. The CONTRACTOR shall ensure only functional vehicles are used for delivery.

3.2.2 Contractors shall ensure that drivers obey the traffic rules/regulations of AUAB.

3.2.3 Dependable and sufficient equipment that is appropriate and adequate to accomplish the work specified shall be assembled at the site of the work in a sufficient time before the start of paving to permit thorough inspection, calibration of any weighing and measuring devices, adjustment of parts, and the making of any repairs that maybe required. The Contractor will maintain up-to-date records of all calibrations and inspections and devices will be calibrated in accordance with manufacture specifications. The equipment shall be maintained in good working conditions and free of oil and hydraulic fluid leaks.

3.2.4 Plant operations shall be available 24/7, in order to execute a variety of task order projects. The CONTRACTOR shall

Exhibit “A”, Scope of Work Page 3 of 19 379 Air Expeditionary Wing provide current certification documents of each plant used, in order to verify it complies with relevant industry standards as defined by the GOVERNMENT or Contracting Officer Representative (COR).

3.3 Measurement

The CONTRACTOR shall coordinate acceptable standards of measurement of materials with the COR prior to beginning work.

3.4 Laboratory

The CONTRACTOR shall submit for GOVERNMENT approval the identification and qualification information pertinent to the laboratory or laboratories performing testing and material analysis required by this SOW.

3.4.1 The Contractor shall use U.S. GOVERNMENT approved laboratory facilities only.

3.4.2 The CONTRACTOR shall maintain, and provide when requested, up-to-date records for inspection and calibration of all laboratory equipment.

4.0 Site Requirements

4.1 Waste

The CONTRACTOR shall be responsible for the collection and disposal of all debris, rubble, residue and waste material generated in the performance of work under this contract. The CONTRACTOR shall legally and properly remove and dispose of all such materials from the installation. The CONTRACTOR is not permitted to deposit materials in base trash collection containers or on base locations without prior approval of the CO.

Any recycled millings from any project will be hauled to a specified location on the base for future use by the

4.2 Hazardous Materials

Materials classified as hazardous by U.S. and Qatari environmental rules, regulations, or laws, shall be handled for disposal in accordance with those rules, regulations, or laws.

4.2.1 Hazardous Materials used for Construction Activities:

Materials classified as hazardous by U.S. or Qatari environmental rules, regulations, or laws, shall be handled in accordance with those rules, regulations, or laws. In accordance with AFI 32-7086, Hazardous Materials Management

(paragraph 2.5.5), the CONTRACTOR shall submit for approval Material Safety Data Sheets (SDS for those materials considered hazardous to the CO PRIOR to the hazardous material ENTERING the installation. All hazardous material shall be stored in a safe and environmentally responsible manner within construction sites and laydown yards.

4.2.2 The CONTRACTOR shall submit Material SDSs for materials deemed hazardous prior to the waste leaving the installation. The CONTRACTOR is responsible for all such materials that are residue from CONTRACTOR furnished supplies and materials brought to the job site by the CONTRACTOR, and for all such materials identified herein or by the drawings.

4.3 SUB-CONTRACTOR Coordination

The CONTRACTOR shall coordinate the work of all sub-CONTRACTORs and shall ensure the coordination of the work between the various trades.

4.4 Security and Parking

4.4.1 The CONTRACTOR shall follow existing security and parking procedures and instructions applicable to AUAB.

4.4.2 The CONTRACTOR shall be responsible for the physical security of all materials, supplies, and equipment, including

Exhibit “A”, Scope of Work Page 4 of 19 379 Air Expeditionary Wing property that is utilized.

4.4.3 The U.S. Air Force (USAF) shall not be held liable for any CONTRACTOR delays prior to reaching the installation’s entrance. Notification to the USAF of approval to proceed onto the installation shall be a determining factor.

4.5 Vehicular Traffic

4.5.1 The CONTRACTOR shall comply with the local laws and regulations, to include USAF regulations, regarding the safe operation of equipment in and around roadways associated with the construction site. The CONTRACTOR owned and/or operated vehicles violating speeding, parking or traffic regulations on AUAB may be removed from the installation at the CONTRACTOR’s expense.

4.5.2 The CONTRACTOR shall coordinate with the CO or designated alternate to ensure proper warnings to motorists are posted and adequate traffic control is used when vehicles are present. USACE Safety Manual, EM 385-1-1, provides minimum requirements for temporary traffic controls.

4.5.3 The CONTRACTOR shall address known traffic impedances within the site/location and the safety plan.

The CONTRACTOR shall coordinate submittal dates per the AF Schedule of Material Submittals Form 66.

4.5.4 Signs, warning lights, barricades, and other traffic control devices shall be provided by the CONTRACTOR. Warning lights shall be operational at all times during non-daylight hours. Barricades shall be highly luminescent and clearly visible at night. Signs shall also be highly luminescent, blaze orange in color with Black English lettering, and clearly visible and readable from at least 15 m (50 ft.) away.

4.5.5 Temporary traffic control signs (warning and hazard signs) shall be furnished and installed, at the discretion of the CO, by the CONTRACTOR while projects are underway. These warning signs shall be placed near the beginning of the work site and well ahead of the work site for alerting approaching traffic from both directions. Paving and painting equipment shall be marked with large warning signs indicating slow-moving equipment in operation.

4.5.6 Road Diversions/Closures

The CONTRACTOR shall notify the COR at least 14 days prior to work if construction shall impact traffic on the

Roadways, or as required by the GOVERNMENT. The CONTRACTOR shall state in writing the exact dates of the road closure, duration of closure and provide a traffic diversion map showing the location of the diversion (if available), closure, posting of signage, phasing plan (if applicable), and other pertinent information for the impedance.

(GOVERNMENT controls road closures and traffic diversions)

4.5.7 Airfield and Flightline Construction

The CONTRACTOR shall coordinate with the CO to provide any and all documentation needed for airfield waivers and associated works. The CONTRACTOR shall state, in writing, the exact dates of work to be completed on the airfield, duration of construction and plans for equipment and personnel in specific areas, and comply with all regulations as defined by the GOVENMENT.

4.6 Sanitary Provisions

The CONTRACTOR shall provide temporary toilets that satisfy Qatari health requirements for the use of project personnel. Location, type, proposed maintenance, etc. shall be approved by the CO prior to placing toilets. Temporary toilets shall be removed immediately upon completion of the project.

4.7 Pollution Abatement

The CONTRACTOR shall perform work in accordance with USAF and local environmental regulations to minimize pollution, degradation, and exploitation of the environment. The CONTRACTOR shall also, to the maximum extent practicable, prevent, control, and abate environmental pollution by supporting regional pollution abatement programs and by accelerating corrective measures to meet established standards and criteria.

Exhibit “A”, Scope of Work Page 5 of 19 379 Air Expeditionary Wing

4.8 Fire Prevention

4.8.1 The prevention of fire is imperative during construction projects. The CONTRACTOR is responsible for enforcing fire safety in the CONTRACTOR’s work area.

4.8.2 The CONTRACTOR must report all fires to the USAF Fire Department. Attempt to extinguish the fire only if it is safe to do so. Go to the nearest phone and notify the Fire Department at 911 (Cell Phone 4458-9511). Have someone meet the Fire Department upon arrival to provide additional information.

4.8.3 The CONTRACTOR shall have serviceable fire extinguishers readily available at all times.

4.8.4 Burning of trash and rubbish at the construction site is strictly prohibited.

4.8.5 The CONTRACTOR may not use gasoline or diesel fuel for cleaning parts or surfaces.

4.8.6 Electrical extension cords may be used on a temporary basis to power tools and equipment. Do not overload extension cords. Frayed, cut, or spliced extension cords are strictly prohibited.

4.9 Safety Features

4.9.1 All work shall be in compliance with Air Force Instruction 91-203, Air Force Consolidated Occupational Safety

Instruction, latest edition dated 15 June 2012.

4.9.2 At all times, the construction site and laydown yard (if applicable) may be inspected by the CO or designated representative for fire, safety, environmental or public health discrepancies. All discrepancies noted shall be fixed immediately. If discrepancies cannot be fixed immediately, the CONTRACTOR shall remove the items from the installation.

4.10 Site Access

4.10.1 The CONTRACTOR shall acquire base Badges and Passes in accordance with base requirements.

4.10.2 The CONTRACTOR may be held responsible for any delays that occur as a result of delayed initiation of the base access process.

4.10.3 The CONTRACTOR shall be escorted in accordance with base requirements.

4.11 BCE Work Clearance Request

The CONTRACTOR shall obtain a Base Civil Engineer Work Clearance Request (AF Form 103) from the CO or designated representative at the pre-construction conference prior to commencement of site work.

4.11.1 Dig Permit:

The CONTRACTOR shall apply for and maintain active dig permits during excavation activities. The CONTRACTOR shall have a copy of the dig permit present onsite during all excavation activities. If the CONTRACTOR damages a utility, the CONTRACTOR shall contact the CO or designated representative immediately.

4.11.2 Hot Work Permit:

The CONTRACTOR shall obtain a Welding, Cutting and Brazing Permit (AF Form 592) prior to commencement of all hot work. Hot work includes, but is not limited to, welding, cutting, brazing operations and the use of tar kettles. The

CONTRACTOR should submit their completed AF Form 592 to the CO or designated representative for approval and coordination.

4.12 Temporary Construction Fencing

Temporary construction fencing is required around all work sites as specified by the GOVERNMENT.

Exhibit “A”, Scope of Work Page 6 of 19 379 Air Expeditionary Wing

4.12.1 The location and layout of the temporary construction fencing shall be annotated on the site/work plan and approved per the AF Schedule of Material Submittals Form 66 prior to installation.

4.13 Excavations for Utilities

4.13.1 All excavations outside the fenced construction site shall have barriers, signage and significant lighting to be clearly seen during limited visibility.

4.13.2 It remains the CONTRACTOR’s responsibility to schedule ALL WORK to minimize the length of time excavations are open. Should excavations remain open for an extended period, the CONTRACTOR may be asked to close the excavation until such time as the work can begin again. All costs or time delays associated with such work are the sole responsibility of the CONTRACTOR.

4.13.3 The CONTRACTOR shall provide temporary access across excavations that impede major pedestrian thoroughfares.

The temporary access provisions shall require approval and inspection by the CO or designated representative.

4.14 Preserving Historical and Archaeological Finds

All items having any apparent historical or archaeological interest which is discovered in the course of any construction activities shall be carefully preserved. The CONTRACTOR shall leave the archaeological find undisturbed and shall immediately report the find to the CO.

5.0 Technical Requirements for Bulk Materials

5.1 General

5.1.1 Any of the materials supplied IAW this statement of work, shall be made available for bulk delivery to the

5.1.2 Bulk delivered items will be delivered per the Task Order SOW. CONTRACTOR shall account for procedural time for entry for vehicles and personnel.

5.1.3 Constituent Elements: CONTRACTOR shall coordinate with approved batch plant(s) to demonstrate acceptable characteristics of material constituent elements proposed for use throughout the life of the contract. If/when

CONTRACTOR proposes a change to the constituent elements (ie: different asphalt mix or manufacturer, different aggregate type, different water source, etc.), CONTRACTOR shall re-submit the material constituent documentation for GOVERNMENT approval. Specifically, the CONTRACTOR shall submit the following for GOVERNMENT approval:

5.1.3.1 Manufacturer’s product data (catalogue cuts and technical data sheets).

5.1.3.2 Sieve analysis, chemical analysis, source location, delivery logistic information of the proposed course aggregate.

5.1.3.3 Sieve analysis, chemical analysis, source location, delivery logistic information of the proposed fine aggregate.

5.1.3.4 Submittal on batch plant’s mix designer’s qualifications.

5.1.3.5 Submittal of mix design based on one cubic meter of material, or as specified by the GOVERNMENT.

5.2 Delivery

5.2.1 The CONTRACTOR shall have an English speaking personnel on hand for all deliveries. The GOVERNMENT shall only acknowledge actual delivered material on the delivery ticket; any requests to the contrary may result in dismissal from AUAB and suspension on contract.

Exhibit “A”, Scope of Work Page 7 of 19 379 Air Expeditionary Wing

5.2.2 CONTRACTOR shall ensure full scheduled amount is delivered as scheduled. Each truckload of material shall be approved by Government personnel to determine actual quantity delivered. If the Contractor is found to have forged delivery tickets, the government reserves the right to terminate the contract and withhold payment.

5.2.3 At a minimum, the contractor shall have the capacity to pave and compact 500 metric tons of asphalt per day. The

GOVERNMENT reserves the right to request higher quantities of material on each task order.

5.2.4 The CONTRACTOR shall ensure that prearranged deliveries are accomplished on time and with the requested quantities.

5.2.5 The GOVERNMENT reserves the right to withhold payment if the quality or amount of material delivered is substandard and unacceptable. Any unacceptable material will be disposed of off AUAB at no additional expense to the government. The CONTRACTOR shall furnish delivery tickets for all deliveries.

5.2.6 Relocating: For every Task Order requiring relocation of material from within AUAB, the CONTRACTOR shall be responsible for removal of the specified amount of material from the site of origin, transportation of that material to another location on AUAB, and dumping of that material at the new location. Relocated materials may or may not originate from the CONTRACTOR’s initial delivery location. All paragraphs relating to the delivery of the materials from off-base also apply for these line items.

5.2.7 Spreading: For Task Orders requiring spreading, the CONTRACTOR shall spread the material at a predetermined rate based on the SOW for each Task Order. The Contractor shall spread the material to provide a flat and smooth surface.

5.3 Base and Subbase Materials

5.3.1 Sub-base:

5.3.1.1 Sub-base shall consist of stone that has been quarried from rock formations. The stone shall be crushed and screened to produce dense-graded crushed aggregate material. Gradation requirements shall be specified in each task order. CONTRACTOR is responsible for providing official gradation reports from the manufacturer before delivery according to submittal requirements.

5.3.2 Classification and Testing of Materials

5.3.2.1 Testing shall be the responsibility of the CONTRACTOR and shall be performed by a certified commercial testing laboratory or by the CONTRACTOR. No work requiring testing will be permitted until the

CONTRACTOR'S facilities have been approved by the COR.

5.3.2.2 Moisture Contents In the stockpile, excavation, or borrow areas, a minimum of two tests per day per type of material or source of material being placed during stable weather conditions shall be performed in accordance with American Society for Testing and Materials (ASTM) D 2216. During unstable weather, tests shall be made as dictated by local conditions and approved by the COR.

5.3.2.3 Optimum Moisture and Laboratory Maximum Density Tests shall be made for each type material or source of material including borrow material to determine the optimum moisture and laboratory maximum density values in accordance with ASTM D 1557. One representative test per 1000 cubic meters (1300 cubic yards) of fill and backfill, or when any change in material occur which may affect the optimum moisture content or laboratory maximum density.

Exhibit “A”, Scope of Work Page 8 of 19 379 Air Expeditionary Wing

5.3.2.4 Field in-place density shall be determined in accordance with ASTM D1556 or ASTM D6938. The

Calibration checks of both the density and moisture gauges shall be made at the beginning of a job on each different type of material encountered and at intervals as directed by the COR. When test results indicate, as determined by the COR, that compaction is not as specified, the material shall be removed, replaced and re-compacted to meet specification requirements at no additional expense to the Government. Tests on re-compacted areas shall be performed to determine conformance with specification requirements. The following number of tests, if performed at the appropriate time, will be the minimum acceptable for each type operation:

- One test per 40 cubic meters (52 cubic yards), or fraction thereof, of each 6 inch of fill or backfill for paved areas shall be performed.

- One test per 80 cubic meters (104 cubic yards), or fraction thereof, of each 6 inch lift of fill or backfill for unpaved areas shall be performed.

5.4 Base Course

5.4.1 Base Course shall consist of stone that has been quarried from rock formations. The stone shall be crushed and screened to produce dense-graded crushed aggregate material. Gradation requirements shall be specified in each task order. Contractor is responsible for providing official gradation reports from the manufacturer before delivery according to submittal requirements.

5.4.1.1 Aggregates shall be handled and stored in a manner to avoid breakage, segregation, or contamination by foreign materials. Material storage at the batch plant site will be covered in a manner to prevent moisture and dust from contaminating the material. Material coverage will be approved by the COR.

5.4.1.2 Base course measurement will be for compacted in place base course to neat line dimensions as (1) described on the plan or in the task order, or (2) by the area marked by the COR multiplied by the plan thickness.

5.4.1.3 Materials delivered to the site shall be inspected for damage, unloaded and stored with a minimum of handling. Materials shall be handled in such a manner as to insure no damage to the joint sealant materials.

Storage facilities shall be provided by the contractor near the job site for maintaining materials at temperatures recommended by the manufacturer. Material storage areas are subject to inspection at the request of the COR.

5.4.1.4 Base course shall meet the requirements for Graded-Crushed Aggregate Base Course (GCA.) Aggregates shall be durable and sound, free from lumps and balls of clay, organic matter, objectionable coatings and other foreign material. The Sieve analysis test shall be performed in accordance with ASTM C136. The

Contractor shall submit a compaction test, QC LAB optimum moisture content and a Sieve analysis report of the base course/sub base course aggregates conforming to the gradation prior to delivery of base/sub base course aggregates, in accordance with ASTM D75.

5.4.1.4.1 GCA fine aggregate shall consist of angular particles produced by crushing stone or gravel that meets the requirements for wear and soundness specified for GCA coarse aggregate. Fine aggregate shall be produced by crushing only particles larger than 4.75 mm Sieve in size. The fine aggregate shall contain at least 90 percent by weight of particles having two or more freshly fractured faces in the portion passing the 4.75 mm Sieve and retained on the 2 mm Sieve, and in the portion passing the 2 mm Sieve and retained on the 0.425 mm Sieve.

5.4.1.4.2 The specified gradation requirements shall apply to the completed base course. The aggregates shall be continuously well graded within the limits specified within each Task Order.

5.4.1.4.3 Aggregates shall be evaluated based on uniform specific gravity. If materials from different sources are used for the coarse and fine aggregates, they shall be tested in accordance with ASTM C127 and ASTM C128 to determine their specific gravities. If the specific gravities vary by more than 10 percent, the percentages passing the various Sieves shall be corrected as directed by the COR.

Exhibit “A”, Scope of Work Page 9 of 19 379 Air Expeditionary Wing

5.5 Classification and Testing of Materials

5.5.1 Base Course Gradation: An initial gradation test per ASTM C136 is required prior to placement of any base course material. Gradation tests are required for each 1,000 cubic meters (1,300 cubic yards) of base course construction. All tests will meet the requirements.

5.5.2 Liquid Limit and Plasticity Index: Liquid limit and plasticity index (ASTM D4318) requirements shall apply to the completed course and shall also apply to any component that is blended to meet the required gradation. The portion of any component or of the completed course passing the 4.76 mm Sieve shall be either non-plastic or have a liquid limit not greater than 25 and a plasticity index not greater than 5. Liquid limit and plasticity index tests are required for each 1,000 cubic meters (1,300 cubic yards) of base course construction. All tests will meet the requirements. No asphalt shall be placed prior to approval of base course test results submitted to the COR.

5.5.3 Optimum Moisture and Laboratory Maximum Density Tests shall be made for each type material or source of material including borrow material to determine the optimum moisture and laboratory maximum density values in accordance with ASTM D 1557. One representative test per 1,000 cubic meters (1,300 cubic yards) of fill and backfill, or when any change in material occur which may affect the optimum moisture content or laboratory maximum density. No asphalt shall be placed prior to approval of base course test results submitted to the COR.

5.5.4 Base Course Compaction: Density of compacted mixture shall be a minimum 100% of laboratory maximum density as determined by ASTM D1557 (Modified Proctor). The density will be measured in accordance with ASTM D6938 or

ASTM D1556. A minimum of two density tests will be accomplished within each 200 cubic meters (260 cubic yards) area of full depth repair and submitted to the COR’s review prior to placing of asphalt. When the sub base course or the base course is determined to be less than the required compaction, the effected layer shall be removed, the lower lift will be re-compacted and the defective lift will be replaced and compacted at no cost to the Government.

5.6 Sand

Gradation requirements for sand shall be specified in each task order. Typical values are as follows: 95-100% passing

4.76mm (number 4) Sieve, 80-100% passing 2.36mm (number 8) Sieve, 50-85% passing 1.18mm (number 16) Sieve, 25-60% passing 0.6mm (number 30) Sieve, 10-30% passing 0.3mm (number 50) Sieve, 2-10% passing 0.15mm

(number 100) Sieve.

5.7 Gravel

All gravel provided under this Contract shall consist of stone that has been quarried from rock formations, crushed and screened to produce a minimum of seven (7) facets per piece. Round and outsized stone is not acceptable and shall be removed from the base at the Contractor’s expense. Contractor is responsible for providing samples before delivery and the USG reserves the right to test materials in order to ensure complete compliance.

5.8 Asphalt

5.8.1 Fill

Fill material shall have a liquid limit of not more than 25 and a plasticity index of not more than 6 when tested in accordance with ASTM D 4318. Test results will be submitted to COR for approval.

5.8.1.1 Fill material shall be locally available. Compactable fill is acceptable. Fill shall not contain metal, plastic, trash, frozen materials, vegetation, debris, or other man-made materials. Fill materials shall be free of rock or gravel larger than 2 in (50 mm). Silt and sand are not acceptable fill material. Fill shall be compacted to attain a minimum of 95% of maximum laboratory density as determined by a Modified Proctor Test conducted in accordance with ASTM D1557. Test results will be submitted to COR for approval.

5.8.2 Crushed Stone Base Course

Exhibit “A”, Scope of Work Page 10 of 19 379 Air Expeditionary Wing

Crushed stone base course shall consist of sound, durable particles of crushed stone or crushed gravel. Typical aggregate gradation shall conform to gradation specified in the following table, however, will be specified in each task order:

Crushed Aggregate Base Course Gradations

Sieve Size, mm Percent Passing by Mass

25.0 100

19.0 90-100

9.5 50-85

4.75 35-70

2.36 20-55

0.6 12-33

0.075 3-7

The crushed stone base course material shall be free of organic material, trash, debris, dirt, and other deleterious material. The fraction of the crushed stone base course material passing the 0.425 mm Sieve shall have a liquid limit not to exceed 25 and a plasticity index not to exceed 5. Each layer of crushed stone base course shall be compacted to attain a minimum of 95% of maximum laboratory density with 6 inch lifts as determined by a Modified Proctor test conducted in accordance with ASTM D1557.

5.8.3 Hot-Mix Asphalt Aggregate

Aggregates shall consist of crushed stone, crushed gravel, screenings, natural sand, and mineral filler, as required. All aggregate test results and shall be submitted to the COR at least 14 days prior to start of construction. Aggregate testing shall have been performed within 90 days of performing the mix design.

5.8.3.1 Coarse Aggregate

Coarse aggregate shall consist of sound, tough, durable particles, free from films of material that would prevent thorough coating and bonding with the asphalt material and free from organic matter and other deleterious substances. At least 75 percent by weight of coarse aggregate shall have at least two or more fractured faces when tested in accordance with ASTM D5821. Fractured faces shall be produced by crushing. The particle shape shall be essentially cubical and the aggregate shall not contain more than 5 percent, by weight, of flat and elongated particles (5:1 ratio of maximum to minimum) when tested in accordance with ASTM D 4791. Clay lumps and friable particles shall not exceed 0.3 percent, by weight, when tested in accordance with ASTM C 142/C 142M. Test results will be submitted to COR for approval.

5.8.3.2 Fine Aggregate

Fine aggregate shall consist of clean, sound, tough, durable particles. The aggregate particles shall be free from coatings of clay, silt, or any objectionable material and shall contain no clay balls. The quantity of natural sand (un-crushed material) added to the aggregate blend shall not exceed 15 percent by total weight of aggregate. The individual fine aggregate sources shall have a sand equivalent value greater than 45 when tested in accordance with ASTM D 2419. The fine aggregate portion of the blended aggregate shall have an un-compacted void content greater than 45.0 percent when tested in accordance with ASTM C

1252 Method A. Clay lumps and friable particles shall not exceed 0.3 percent, by weight, when tested in accordance with ASTM C 142/C 142M. Test results will be submitted to COR for approval.

5.8.3.3 Aggregate Gradation

The combined aggregate gradation shall conform to gradations specified by the GOVERNMENT when tested in accordance with ASTM C 136 and ASTM C 117, and shall not vary from the low limit on one Sieve to the high limit on the adjacent Sieve or vice versa, but grade uniformly from coarse to fine. Test results will be submitted to COR for approval.

Exhibit “A”, Scope of Work Page 11 of 19 379 Air Expeditionary Wing

6.0 Technical Requirements for Asphalt

6.1 Fill

See paragraph 5.8.1.

6.2 Crushed Stone Base Course

See paragraph 5.8.2.

6.3 Hot-Mix Asphalt Aggregate

See paragraph 5.8.3.

6.4 Prime Coat

Prime coat shall consist of emulsified asphalt conforming to ASTM D 977, Type SS1h or ASTM D 2397, Type CSS-1h, or as specified in each task order. The emulsified asphalt should be diluted with no more than an equal volume of water.

6.4.1 The application of a prime coat will be permitted only when the ambient air and surface temperature on the project are both at least 16C in the shade and only when conditions are dry.

6.4.2 Apply bituminous material for the prime coat in quantities of not less than 0.80 L or more than 1.60 L/square meter of pavement surface.

6.4.3 The prime coat should be applied within the temperature range specified by the product manufacturer or at a temperature that provides an application viscosity between 10 and 60 seconds (Saybolt Furol) or between 20 and 120 square mm/sec (kinematic).

6.4.4 Allow the prime coat to cure without being disturbed for a period of at least 48 hours or longer, as may be necessary to attain penetration into the base course.

6.5 Tack Coat

Tack coat shall consist of emulsified asphalt conforming to ASTM D 977, Type SS1H or ASTM D 2397, Type CSS-1H.

The emulsified asphalt should be diluted with no more than an equal volume of water.

6.5.1 The application of a tack coat will be permitted only when the ambient air and surface temperature on the project are both at least 16 degrees C in the shade and only when conditions are dry.

6.5.2 Immediately before applying the tack coat, remove all loose material, dirt, clay, or other objectionable material from the surface to be treated by means of a power sweeper and compressed air. The surface shall be dry and clean at the time of treatment.

6.5.3 Apply bituminous material for the tack coat in quantities of not less than 0.20 L or more than 0.70 L/square meter of pavement surface.

6.5.4 The tack coat should be applied within the temperature range specified by the product manufacturer or at a temperature that provides an application viscosity between 10 and 60 seconds, Saybolt Furol, or between 20 and 120 square mm/sec, kinematic.

6.5.5 Tack application ahead of mat laydown shall be limited by job conditions and be subject to approval. Tack application ahead of mat laydown shall not exceed the amount estimated for one day operation. Extreme care should be taken to ensure that tack coat is not applied in a manner that allows the tack coat to be rendered ineffective by being coated with dust prior to the next lift of asphalt being placed.

6.5.6 Tacked areas which become unsatisfactory as a result of traffic, weather, or other conditions shall be re-tacked at no cost to the government.

Exhibit “A”, Scope of Work Page 12 of 19 379 Air Expeditionary Wing

6.6 Prime Coat and Tack Coat Distribution

Distributors: Distributors used to apply the asphalt material shall be self-propelled, equipped with pressure type mechanical circulating pumps and valves, and equipped with a heating system and insulated tank, which will provide the uniform required temperature throughout the entire contents of the distributor tank. Detachable distributor units separate from the tank will not be allowed.

6.6.1 The distributor shall uniformly apply the liquid asphalt material to the road surface in accurately measured quantities, and maintain the specified rate of application during the distribution of the entire tank-load, regardless of change in gradient, super elevation, direction, or content level in the tank. Calibration runs for verification shall be made at the start of the work. Application and testing of tack coat must be in accordance with ASTM standards. Report must be submitted to COR within 3 days.

6.6.2 The spray nozzles shall be designed, sized, and arranged to ensure uniform distribution of liquid asphalt material at the designated rate, in an overlapping fan shaped spray without surge, streaks, ridges, or bare spots. A strainer shall be provided in the discharge line to prevent nozzles from clogging. The output of each and every nozzle on the bar shall be the same and a test shall be made in advance of use to determine compliance with this requirement. Different sizes, heights, pressures, and settings of nozzles for different designated rates shall be provided. Test results will be submitted to COR for approval within 3 days, or before this phase of work is allowed to continue.

6.6.3 The distributor shall be equipped with a tachometer, clearly visible to the operator, which accurately shows the speed of the vehicle.

6.6.4 Unauthorized increases in rate of application will not be eligible for payment.

6.6.5 The angle of the spray nozzles and the height of the spray bar shall be set to obtain uniform distribution. The distributor shall travel at the established speed when the spray bar is opened. Areas and edges inaccessible to the distributor shall be covered by hand spray methods. When the distributor is not in operation, it shall be parked off the roadbed or drip pans shall be placed under the spray bar.

6.7 Asphalt Cement Binder

Asphalt cement binder shall conform to ASTM D 946/D 946M Penetration Grade 60-70. Test data indicating grade certification shall be provided by the supplier at the time of delivery of each load to the mix plant. Copies of these certifications shall be submitted to the COR - before start of asphalt placement. The supplier is defined as the last source of any modification to the binder. The COR may sample and test the binder at the mix plant at any time before or during mix production. Samples for this verification testing shall be obtained by the Contractor in accordance with

ASTM D140/D 140M. These samples shall be furnished to the COR for the verification testing, which shall be at no cost to the Government.

6.8 Asphalt Design Mix

The Contractor shall develop the mix design in accordance with each task order. The asphalt mix shall be composed of a mixture of well-graded aggregate, mineral filler if required, and asphalt binder. The aggregate fractions shall be sized, handled in separate size groups, and combined in such proportions that the resulting mixture meets the grading requirements of the job mix formula (JMF). No hot-mix asphalt for payment shall be produced until a JMF has been approved. The Contractor shall submit the mix design to the COR for acceptance; including applicable temperatures governing manufacture and placement of asphalt. Test results will be submitted to COR for approval.

6.9 Hot-Mix Asphalt Plant

Plants used for the preparation of hot-mix asphalt shall be the Contractor's responsibility and shall conform to the requirements of ASTM D 995.

6.9.1 Truck Scales. The asphalt mixture shall be weighed on approved scales furnished by the Contractor; Scales shall be inspected and sealed at least annually by an approved calibration laboratory. Test results will be submitted to COR for approval within 3 days.

Exhibit “A”, Scope of Work Page 13 of 19 379 Air Expeditionary Wing

6.9.2 The CO and COR shall have access at all times, to all areas of the plant for checking adequacy of equipment;

inspecting operation of the plant; verifying weights, proportions, and material properties; checking the temperatures maintained in the preparation of the mixtures and for taking samples.

6.9.3 The Contractor will provide assistance as requested, for the Government to procure any desired samples.

6.9.4 The asphalt mixture may be stored in non-insulated storage bins for a period of time not exceeding 3 hours. The asphalt mixture may be stored in insulated storage bins for a period of time not exceeding 8 hours. The mix drawn from bins shall meet the same requirements as mix loaded directly into trucks.

6.10 Transporting Hot-Mix Asphalt

The hot-mix asphalt shall be transported from the mixing plant to the site in clean, tight vehicles. Deliveries shall be scheduled so that placing and compacting of mixture is uniform with minimum stopping and starting of the paver.

Adequate artificial lighting shall be provided for night placements (reference EM 385-1-1, section 7). Hauling over freshly placed material will not be permitted until the material has been compacted as specified, and allowed to cool to

60 degrees C.

6.10.1 Hauling Equipment

6.10.1.1 Trucks used for hauling hot-mix asphalt shall have tight, clean, and smooth metal beds. To prevent the mixture from adhering to them, the truck beds shall be lightly coated with a minimum amount of paraffin oil, lime solution, or other approved material as approved by the COR. Petroleum based products shall not be used as a release agent. It is recommended that each truck shall have a suitable cover to protect the mixture from adverse weather. When necessary to ensure that the mixture will be delivered to the site at the specified temperature, truck beds shall be insulated or heated and covers (tarps) shall be securely fastened.

6.10.2 Asphalt Pavers

6.10.2.1 Asphalt pavers shall be self-propelled, with an activated screed, heated as necessary, and shall be capable of spreading and finishing courses of hot-mix asphalt which will meet the specified thickness, smoothness, and grade. The paver shall have sufficient power to propel itself and the hauling equipment without adversely affecting the finished surface. If an automatic grade control device is used, the paver shall be equipped with a control system capable of automatically maintaining the specified screed elevation. The control system shall be automatically actuated from either a reference line and/or 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. The transverse slope controller shall be capable of maintaining the screed at the desired slope within plus or minus 0.1 percent. A transverse slope controller shall not be used to control grade.

6.11 Placing Hot-Mix Asphalt

The mix shall be placed in lifts of adequate thickness and compacted at a temperature suitable for obtaining density, surface smoothness, and other specified requirements. Upon arrival, the mixture shall be placed to the full width by an asphalt paver; it shall be struck off in a uniform layer of such depth that, when the work is completed, it shall have the required thickness and conform to the grade and contour indicated. The speed of the paver shall be regulated to eliminate pulling and tearing of the asphalt mat.

Unless otherwise permitted, placement of the mixture shall begin along the centerline of a crowned section or on the high side of areas with a one-way slope. The mixture shall be placed in consecutive adjacent strips having a minimum width of 3 m. The longitudinal joint in one course shall offset the longitudinal joint in the course immediately below by at least 300 mm; however, the joint in the surface course shall be at the centerline of the pavement. Transverse joints in one course shall be offset by at least 3 m from transverse joints in the previous course. Transverse joints in adjacent lanes shall be offset a minimum of 3 m.

Exhibit “A”, Scope of Work Page 14 of 19 379 Air Expeditionary Wing

On isolated areas where irregularities or unavoidable obstacles make the use of mechanical spreading and finishing equipment impractical, the mixture may be spread by hand tools. The hot-mix asphalt shall not be placed upon a wet surface or when the surface temperature of the underlying course is less than 4 degrees C (39 degrees F). Asphalt placed on road surfaces should have a 2” wear surface.

6.11.1 Compaction

6.11.1.1 After placing, the mixture shall be thoroughly and uniformly compacted by rolling to 93.0-96.5% of the maximum specific gravity of the mix (Gmm). The surface shall be compacted as soon as possible without causing displacement, cracking or shoving. The sequence of rolling operations and the type of rollers used shall be at the discretion of the Contractor, with the exception that the Contractor shall not apply more than three passes with a vibratory roller in the vibrating mode.

6.11.1.2 The speed of the roller shall, at all times, be sufficiently slow to avoid displacement of the hot mixture and be effective in compaction. Sufficient rollers shall be furnished to handle the output of the plant. Rolling shall continue until the surface is of uniform texture, true to grade and cross section, and the required field density is obtained. To prevent adhesion of the mixture to the roller, the wheels shall be kept properly moistened but excessive water will not be permitted. In areas not accessible to the roller, the mixture shall be thoroughly compacted with hand tampers.

6.11.1.3 Any mixture that becomes loose and broken, mixed with dirt, contains check-cracking, or is in any way defective shall be removed full depth, replaced with fresh hot mix asphalt and immediately compacted to conform to the surrounding area. This work shall be done at the Contractor's expense. Skin patching will not be allowed. CONTRACTOR shall provide sufficient additional trucks and rollers to support placement and compaction efforts to ensure mechanical defects do not create a work stoppage.

6.12 Hot-Mix Asphalt Joints

6.12.1 Transverse

6.12.1.1 The roller shall not pass over the unprotected end of the freshly laid mixture, except when necessary to form a transverse joint. When necessary to form a transverse joint, it shall be made by means of placing a bulkhead or by tapering the course. The tapered edge shall be cut back to its full depth and width on a straight line to expose a vertical face prior to placing the adjacent lane. The cutback shall be a minimum of

75 mm, or at the discretion of the COR, to ensure a solid, compacted surface to place against. The cutback material shall be removed from the project. In both methods, all contact surfaces shall be given a light tack coat of asphalt material before placing any fresh mixture against the joint.

6.12.2 Longitudinal

6.12.2.1 All longitudinal joints shall be cut back a maximum of 75 mm from the top edge of the lift with a cutting wheel to expose a clean, sound vertical surface for the full depth of the course. All cutback material shall be removed from the project. Cutting equipment that uses water as a cooling or cutting agent shall not be permitted. All contact surfaces shall be given a light tack coat of asphalt material prior to placing any fresh mixture against the joint.

6.13 Hot-Mix Asphalt Airfield Patching

Hot-mix asphalt patches shall be constructed to match the pavement structure being repaired as closely as possible and provide a permanent repair for the damaged section of hot-mix asphalt pavement.

6.13.1 All work associated with placement of patch must be complete and surface of patch must be cooled to less than 70 degrees C within 3 hours after entry onto AUAB.

6.13.2 If the patch will be placed on top of existing asphalt, all loose and damaged material should be removed and the

Exhibit “A”, Scope of Work Page 15 of 19 379 Air Expeditionary Wing remaining asphalt pavement shall be thoroughly cleaned with either a power broom or high pressure compressed air to result in a clean, dry surface. Tack coat shall be applied such that all patch surfaces (including the edges of the saw cuts) are covered with a thin layer of tack coat. If the tack coat application results in puddling, pooling, or running tack coat, the excess material should be blotted and removed prior to placement of the hot-mix asphalt.

6.13.3 When placing the mix in the patch, extreme care should be taken to prevent segregation of the material.

6.13.4 The hot-mix asphalt shall be placed with adequate thickness such that thorough compaction can be achieved and result in a final surface that closely matches the existing surface after “roll-down”.

6.13.5 For patches smaller than one m2, the patch may be compacted with a vibratory plate compactor or small manually operated roller.

6.13.6 For patches greater than one m2, a full-sized, driver operated steel drum or rubber tired roller compacter or combination thereof shall be used to compact the hot-mix asphalt.

6.13.7 The surface of all patches shall be smooth within the tolerance of 10 mm per 3 m, as determined by measuring vertical variation (sags or humps) with a 3 m straight edge.

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