B08 40497308 RFP Att1 SOW.pdf

PMIS 228351 Reconstruct Taxiway RT 906 Page 1

Scope of Work

Reconstruct Taxiway Portion of the Texas White House Parking Route 906 Lyndon B. Johnson National Historical Park

29 October 2020

1. Location and Facilities: The Visitor Center/Headquarters (VC/HQ) building is located at 100 E. Ladybird Lane, Johnson City, in Blanco County, Texas. Ladybird Lane is two blocks South of Main Street (US 290) and can be accessed via F Street or G Street. The LBJ Ranch, from park headquarters, can be accessed by taking Highway 290 westbound for fifteen miles towards Stonewall, in Gillespie County, Texas. Turn north (right) on Ranch Road 1 to Klein road and Park Road 49. For more information see the Park website at http://www.nps.gov/lyjo.

The Airstrip (and Taxiway) was built in stages beginning in April 1953 with a grass strip for small airplane takeoffs and landings. Sometime later (date unknown) the grass landing strip was replaced with a gravel strip. The first asphalt-surfaced strip was built in 1960/61, and in 1964, the present configuration was designed to allow use by larger aircraft. In 2012 the Taxiway was micro-sealed.

2. General Requirements: This procurement consists of three (3) Contract Line (Bid) Items.

The work consists of furnishing all labor, material, equipment and incidentals to complete the proposed work. See drawings and specification for further information.

A. Contract Line Item 1: Reconstruct Taxiway Portion of the Texas White House Parking Route 906. The Taxiway has been converted into the public parking area for visitors visiting the Texas White House complex. The Taxiway surface does not shed water properly and has alligator cracks that are forming. The work will consist of pulverizing approximately 4,900 square yards of existing 1.5-2 inches of existing asphalt and reworking/adding to 8-10 inches of existing base material. Grade, shape and compact reworked/new base material and asphalt to specified densities. Included in the work is two large dig-out areas (1,350 S.Y and 500 S.Y); excavate 3 feet of existing sandy clay loam, place and compact of 3-5-inch screened rock to create a firm sub-base layer. Compacted new pavement layers will have 1 1/2 inches course graded asphalt and 1 1/2 inches wearing course, for a total of 3 inches of new asphalt surface. Work will also include re-striping approximately 80 parking stalls and 4 accessible stalls. Work shall be in accordance with TxDOT specifications and guidelines for subject work including preparing the right-of-way, traffic control and temporary erosion, sedimentation and environmental controls.

B. Contract Line Item 2: Rehabilitate Storm Sewer: Work includes rehabilitation of the existing drop inlets and the addition of an additional drop inlet similar in size and shape and piped to the existing drop inlet/storm water system.

http://www.nps.gov/lyjo

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C. Contract Line Item 3: Pedestrian Walkway. For the protection of visitors, a formal pedestrian walkway will be constructed of on the south side of the taxiway, approximately 800 feet long x 6 feet wide. Work consists of placing, grading, shaping and compacting approx. 4800 square feet of base material to a depth ranging from 6 inches to 4 inches and installation of a recycled product edging material.

Work shall be conducted between the hours of 7:00 AM and 4:00 PM, Monday through Friday, and actual work dates and schedule shall be coordinated with the CO or COR at least ten (10) working days in advance. All material and equipment must be on-hand before any work takes place. Upon receiving Notice to Proceed, contractor shall begin work within 15 days. The work shall be completed within 120 days from notice to proceed.

3. Safety/Traffic Control: Safety is of highest concern to the Park. Work will be stopped if an unsafe action is noted. At no time shall the contractor operate equipment in an illegal or unsafe manner which may endanger others. The Contractor shall be responsible for all employee safety on the work site. The Contractor shall provide and ensure the use of all required personal protective gear such as safety vests, hard hats, gloves, ropes, eye protection, hearing protection, harnesses, etc.

The Contractor shall provide traffic control to ensure the safety of our visitors as well as protection for the Contractor’s employees. All operations shall comply with applicable OSHA regulations and industry standards.

• Injuries/Accidents: The Contractor shall report all serious injuries (those requiring medical attention) or fatalities that occur on the work site to the COR as soon as possible. The contractor shall report all injuries to the public or damage to private property to the COR as soon as possible.

• Submittal: Submit Traffic Control Plan for approval prior the beginning any on-site work. Alternatives for the traffic control plan shall consider closing access to the Texas White House complex by visitors during weekdays but allowing access on the weekends. Complex access alternatives could include parking in the movie field and exiting on a portion of the taxiway or parking in the field at the end of Park Road 49 and walking from the east gate. During the weekdays, the roads to the norths of Park Road 49 (Bailey, Malechek, James Davis, etc.) may be blocked to visitor traffic, and flagged for construction and authorized (NPS/Johnson family/guest) access only.

o Materials may be new or used but shall be suitable for intended purpose.

Barricades and signs shall be in accordance to the Manual on Uniform Traffic Control Devices (MUTCD). Fences and barriers shall be structurally adequate and neat in appearance to block off the immediate work area to prevent unauthorized entry. Illuminate barricades and obstructions at night; keep safety lights burning from sunset to sunrise unless barricades are retro-reflective.

Protect pedestrian traffic by fences. Erect and maintain enough detour signs and/or traffic control personnel at road closures and along detour routes.

Completely remove barriers no longer needed when approved by the COR.

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4. Staging Area/Product Handling: Staging area is located and shall be restricted to the southwest end of the airstrip, directly east of the taxiway. Storage of materials will be permitted only in the staging area as designated by the Park. Storage of materials shall be in a location safely away from visitor use areas, but as close as possible to the work site. Ground disturbance and site management will be carefully controlled to prevent damage to vegetation, soils and archeological resources and to minimize air, water, soil, and noise pollution. The Contractor shall keep the worksite neat, clean and free of waste materials and rubbish at all times. The Contractor shall comply with all legal load restrictions in the hauling of materials.

5. Submittals:

1. Specifics as described in this scope of work upon award of contract.

2. All submittals shall be transmitted using National Park Service form CM-16. (SOW

Attachment 1.) No action will be taken on a submittal item unless accompanied by the transmittal form.

6. Completion of Work: Upon completion of this contract the contractor shall remove all equipment, tools, debris from project, etc. and shall leave the premises clean, neat, and in good condition.

7. Other Information and Requirements:

• Relevant Items from the Texas Department of Transportation, Standard Specifications for Construction and Maintenance of Highways, Streets, and Bridges, November 1, 100: Preparing Right of Way 105: Removal of Base and Asphalt Pavement 110 Excavation 134 Backfilling Pavement Edges 152 Grade and Shape 204 Watering 210 Rolling 247 Flexible Base 251 Reworking Base Courses 310 Prime Coat 340 Dense-Graded Hot-Mix Asphalt (Small Quantity) 360 Concrete Pavement 400 Excavation and Backfill for Structures 465 Junction Boxes, Manholes, and Inlets 471 Frames, Grates, Rings, and Covers 481 Pipe for Drains 506 Temporary Erosion, Sedimentation, and Environmental Controls

• Form CM -16

• Drawing Set

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Texas Department of Transportation

Standard Specifications for Construction and Maintenance of Highways, Streets, and Bridges

November 1, 2014

100: Preparing Right of Way

1. DESCRIPTION AND CONSTRUCTION: Prepare the right of way by the removal and storage of all items (waysides, signs, lights, posts, etc.) that will be affected by the construction operations. Mark locations of items to re-install at the end of the construction operation.

2. MEASUREMENT AND PAYMENT: Incorporated into the lump sum of the lime item to which this work is associated with

105: Removal of Base and Asphalt Pavement

1. DESCRIPTION: If pulverizing is determined not to be feasible, break, remove, and store or dispose of existing asphalt pavement, including surface treatments, and treated or untreated base materials.

2. CONSTRUCTION

a. Remove existing asphalt pavement before disturbing stabilized base. Avoid contamination of the asphalt materials and damage to adjacent areas. Repair material damaged by operations outside the designated locations.

b. Material is not designated to be salvaged and will become the property of the Contractor. When this material is disposed of, do so in accordance with federal, state, and local regulations.

3. MEASUREMENT AND PAYMENT: Incorporated into the lump sum of the lime item to which this work is associated with.

110 Excavation

1. DESCRIPTION: Excavate areas as shown on the plans or as directed. Remove materials encountered to the lines, grades, and typical sections shown on the plans and cross-sections.

2. CONSTRUCTION: Accept ownership of unsuitable or excess material and dispose of material in accordance with local, state, and federal regulations at locations outside the right of way.

a. Earth Cuts. Excavate to finish subgrade. Scarify subgrade to a uniform depth at least 6

in. below finish subgrade elevation in areas where base or pavement structure will be placed on subgrade. Manipulate and compact subgrade in accordance with Section 132.3.4., “Compaction Methods.”

i. Take corrective measures as directed if unsuitable material is encountered below subgrade elevations.

b. Maintain drainage in the excavated area to avoid damage to the roadway section.

Correct any damage to the subgrade caused by weather at no additional cost.

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c. Shape slopes to avoid loosening material below or outside the proposed grades.

Remove and dispose of slides as directed.

3. MEASUREMENT AND PAYMENT: Incorporated into the lump sum of the lime item to which this work is associated with.

134 Backfilling Pavement Edges

1. DESCRIPTION: Backfill pavement edges in conformance with the typical sections shown.

2. MATERIALS: Use backfill material capable of sustaining vegetation similar to existing site conditions or existing stockpiled topsoil.

3. CONSTRUCTION: Haul the backfill material to the required location before placing the finish surface course unless directed otherwise. Spread, compact, and shape the backfill material in accordance with the typical sections after placing the finish surface course. Do not drag, push, or scrape material across completed pavement.

4. MEASUREMENT AND PAYMENT: Incorporated into the lump sum of the lime item to which this work is associated with.

152 Grade and Shape

1. DESCRIPTION: Grade and Shape portions of the project limits as shown or as directed.

2. EQUIPMENT: Provide equipment able to effectively produce the desired results. Provide a scarifier if the maintainer is not equipped with a scarifier attachment.

3. CONSTRUCTION: Grade the roadway and shape to the typical sections shown on the plans.

Finish to a profile uniform and consistent with the topography. Use a scarifier when necessary to loosen materials before blading. Use hand methods or other means around structures, trees, and other obstructions if doing the work with a blade is impractical. Do not drag, push, or scrape material along or across completed pavement.

4. MEASUREMENT AND PAYMENT: Incorporated into the lump sum of the lime item to which this work is associated with.

204 Watering

1. DESCRIPTION: Apply water for dust control, earthwork, or base construction.

2. MATERIALS: Furnish water free of industrial wastes and other objectionable matter.

3. EQUIPMENT: Use sprinklers and spray bars equipped with positive and rapidly working cut-off valves.

4. CONSTRUCTION: Apply water at a uniform rate and in the required quantity, or as directed.

5. MEASUREMENT AND PAYMENT: Incorporated into the lump sum of the lime item to which this work is associated with.

210 Rolling

1. DESCRIPTION: Compact embankment, subgrade, base, surface treatments, broken concrete pavement, or asphalt pavement using rollers. Break up asphalt mats, pit run material, or base materials.

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2. EQUIPMENT: Use any type of roller to meet the requirements of the Contract unless otherwise shown on the plans or directed.

3. CONSTRUCTION: Use only rubber-tired equipment to push or pull compaction equipment on base courses. Use equipment that does not damage material being rolled.

247 Flexible Base

1. DESCRIPTION: Construct a foundation course composed of flexible base.

2. SUBMITTALS: Submit material specification for approval prior to on-site work.

3. MATERIALS: Furnish uncontaminated materials of uniform quality that meet the requirements of the plans and specifications.

a. Aggregate. Furnish aggregate of the Grade 1-2 meeting the requirements of Table 1.

Each source must meet Table 1 requirements for liquid limit, plasticity index, and wet ball mill for the grade specified. Do not use additives, such as but not limited to lime, cement, or fly ash to modify aggregates to meet the requirements of Table 1 unless otherwise approved.

b. Material Types. Do not use fillers or binders unless approved. Furnish Type A.

Crushed stone produced and graded from oversize quarried aggregate that originates from a single, naturally occurring source. Do not use gravel or multiple sources.

4. EQUIPMENT: Provide machinery, tools, and equipment necessary for proper execution of the work.

5. CONSTRUCTION: Construct each layer uniformly, free of loose or segregated areas, and with the required density and moisture content. Provide a smooth surface that conforms to the typical sections, lines, and grades shown on the plans or as directed. Stockpile base material temporarily at an approved location before delivery to the roadway.

a. Preparation of Subgrade or Existing Base. Remove or scarify existing asphalt concrete pavement in accordance with Item 105, “Removing Treated and Untreated Base and Asphalt Pavement,” when shown on the plans or as directed. Shape the subgrade or existing base to conform to the typical sections shown on the plans or as directed.

i. When new base is required to be mixed with existing base, deliver, place, and spread the new flexible base in the required amount per station. Manipulate and thoroughly mix the new base with existing material to provide a uniform mixture to the specified depth before shaping.

ii. Roll the roadbed in accordance with Item 210, “Rolling,” before pulverizing or scarifying when shown on the plans or directed. Correct soft spots as directed.

b. Placing. Spread and shape flexible base into a uniform layer with an approved spreader the same day as delivered unless otherwise approved. Construct in 4 to 6 inch layers or as determined. Maintain the shape of the course. Control dust by

PMIS 228351 Reconstruct Taxiway RT 906 Page 7 sprinkling, as directed. Correct or replace segregated areas as directed, at no additional expense.

i. Place successive base courses and finish courses using the same construction methods required for the first course.

c. Compaction. Compact using density control unless otherwise shown on the plans.

Multiple lifts are encouraged. Bring each layer to the moisture content directed.

When necessary, sprinkle the material in accordance with Item 204, “Sprinkling.”

i. Begin rolling longitudinally at the sides and proceed towards the center, overlapping on successive trips by at least 1/2 the width of the roller unit.

Begin rolling at the low side and progress toward the high side on superelevated curves. Offset alternate trips of the roller. Operate rollers at a speed between 2 and 6 mph as directed.

ii. Rework, recompact, and refinish material that fails to meet or that loses required moisture, density, stability, or finish requirements before the next course is placed or the project is accepted. Continue work until specification requirements are met. Perform the work at no additional expense.

iii. Before final acceptance, the COR will select the locations of tests and measure the flexible base depth. Correct areas deficient by more than 1/2 in.

in thickness by scarifying, adding material as required, reshaping, recompacting, and refinishing at the Contractor’s expense.

d. Ordinary Compaction. Roll with approved compaction equipment as directed. Correct irregularities, depressions, and weak spots immediately by scarifying the areas affected, adding or removing approved material as required, reshaping, and recompacting.

e. Density Control. Compact to at least 100% of the maximum dry density, unless otherwise determined. Do not achieve density by drying the material after compaction.

f. Finishing. After completing compaction, clip, skin, or tight-blade the surface with a maintainer or subgrade trimmer to a depth of approximately 1/4 in. Remove loosened material and dispose of it at an approved location. Seal the clipped surface immediately by rolling with a pneumatic tire roller until a smooth surface is attained.

Add small increments of water as needed during rolling. Shape and maintain the course and surface in conformity with the typical sections, lines, and grades as shown on the plans or as directed.

i. Correct grade deviations greater than 1/4 in. in 16 feet measured longitudinally or greater than 1/4 in. over the entire width of the cross-section in areas where surfacing is to be placed. Correct by loosening and adding, or removing material. Reshape and re-compact.

g. Curing. Cure the finished section until the moisture content is at least 2 percentage points below optimum or as directed before applying the next successive course or prime coat.

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6. MEASUREMENT AND PAYMENT: Incorporated into the lump sum of the lime item to

251 Reworking Base Courses

1. DESCRIPTION: Refinish or rework existing base material with or without asphaltic pavement. Incorporate new base material when shown.

2. MATERIALS: Furnish uncontaminated materials of uniform quality that meet the requirements of the plans and specifications.

a. Flexible Base. Furnish new base material that meets the requirements of Item 247, “Flexible Base,” for the type and grade.

3. EQUIPMENT: Provide machinery, tools, and equipment necessary for proper execution of the work.

a. Compaction Equipment. Provide rollers in accordance with Item 210, “Rolling.”

Provide rollers in accordance with Item 216, “Proof Rolling,” when required.

b. Pulverization Equipment. Provide pulverization equipment that:

i. cuts and pulverizes material uniformly to the proper depth with cutters that plane to a uniform surface over the entire width of the cut,

ii. provides a visible indication of the depth of cut at all times, and

iii. uniformly mixes the materials.

4. CONSTRUCTION: Perform work to the width and depth shown on the typical sections for the type of work shown on the plans. Construct and shape exposed subgrade to conform to typical sections as shown on the plans or as directed.

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a. Performance of Work.

i. Scarifying. Loosen and break existing base material, with or without existing asphaltic concrete pavement. Remove asphalt concrete pavement, surface treatment, plant-mix seal, and micro-surfacing when shown on the plans and in accordance with applicable items. Prevent contamination of asphalt material during and after removal. When the existing pavement consists of only a surface treatment, do not remove before scarifying. Scarify existing material for its full width and depth unless otherwise shown on the plans. Do not disturb the underlying subgrade. Break material into particles of not more than 2-1/2 in. unless otherwise shown on the plans.

ii. Salvaging. Remove the existing base material and stockpile. Windrow if allowed. Perform salvage operations without interfering with traffic, proper drainage, or the general requirements of the work. Keep material free of contamination.

iii. Re-Laying. Prepare subgrade as shown on the plans or as directed before relaying salvaged material. Proof roll in accordance with Item 210, “Rolling,” when shown on the plans. Correct soft spots as directed.

1. Return and rework salvaged base material, with or without additional new base material, on the prepared roadbed. Place salvaged material on the prepared subgrade and sprinkle, blade, and shape the base to conform to the typical sections shown on the plans or as directed. Place new base material and uniformly mix with salvaged material when shown on the plans. Correct, or remove and replace, segregated material with satisfactory material, as directed.

iv. Reshaping. Rework scarified base material with or without additional new base material. Mix and shape scarified base to conform to the typical sections shown. Do not disturb the underlying subgrade. Correct, or remove and replace, segregated material with satisfactory material as directed.

v. Refinishing. Blade existing base surface to remove irregularities. Cure before placing the pavement on the refinished base, as shown on the plans or as directed.

b. See 247, “Flexible Base” for Compaction, Density, Finishing and Curing

5. MEASUREMENT AND PAYMENT: Incorporated into the lump sum of the lime item to

310 Prime Coat

1. DESCRIPTION: Prepare and treat existing or newly constructed surface with an asphalt binder or other specialty prime coat binder material. Apply blotter material as required.

2. MATERIALS:

a. Binder. Use material of the type and grade as recommended and as approved.

b. Blotter. Use either base course sweepings obtained from cleaning the base or native sand as blotter materials unless otherwise shown or approved.

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3. CONSTRUCTION: Apply the mixture when the air temperature is at or above 60°F, or above 50°F and rising. Measure the air temperature in the shade away from artificial heat. The Engineer will determine when weather conditions are suitable for application. Do not permit traffic, hauling, or placement of subsequent courses over freshly constructed prime coats.

Maintain the primed surface until placement of subsequent courses or acceptance of the work.

a. Surface Preparation. Prepare the surface by sweeping or other approved methods.

Lightly sprinkle the surface with water before applying bituminous material, when directed, to control dust and ensure absorption.

b. Binder. The Engineer will select the application temperature within the limits recommended by the material manufacturer. Apply material within 15°F of the selected temperature but do not exceed the maximum allowable temperature.

Distribute the material smoothly. Roll the freshly applied prime coat with a pneumatic-tire roller to ensure penetration when directed.

c. Blotter. Spread blotter material before allowing traffic to use a primed surface. Apply blotter material to primed surface at the specified rate as recommended by the material manufacturer. Apply blotter to spot locations as directed to accommodate traffic movement through the work area. Remove blotter material before placing the surface. Dispose of blotter material according to applicable state and federal requirements.

340 Dense-Graded Hot-Mix Asphalt (Small Quantity)

1. DESCRIPTION: Construct a hot-mix asphalt (HMA) pavement layer composed of a compacted, dense-graded mixture of aggregate and asphalt binder mixed hot in a mixing plant. This specification is intended for small quantity (SQ) HMA projects, typically under 5,000 tons total production.

2. SUBMITTALS: The submittal requirements of this specification item may include:

a. A mix design submittal including the plant corrected Job Mix Formula (JMF) for the hot mix asphaltic concrete,

b. Certification that the aggregate materials meet appropriate quality requirements.

c. Particle-size gradation and specific gravity tests on all aggregate materials.

d. Certification that the asphalt cement for paving materials meet appropriate quality requirements.

3. MATERIALS: The Contractor shall furnish materials to meet the requirements specified herein and shall be solely responsible for the quality and consistency of the product delivered to the Project.

a. Aggregate: The aggregate shall be composed of coarse aggregate, a fine aggregate and, if required or allowed, mineral filler and reclaimed asphalt pavement (RAP).

RAP use will be allowed in all base course mixtures. RAP use will not be permitted in

PMIS 228351 Reconstruct Taxiway RT 906 Page 11 pavement surface courses. The aggregate contained in RAP will not be required to meet Table 1 requirements unless indicated.

b. Coarse Aggregate: Coarse aggregate is defined as that part of the aggregate retained on the No. 10 (2.00 mm) sieve and shall consist of clean, tough, durable fragments of crushed stone or crushed gravel of uniform quality throughout.

Gravel from each source shall be crushed to the extent that it has a minimum of 85% of the particles retained on the No. 4 (4.75 mm) sieve with two or more mechanically induced crushed faces as determined by TxDOT Test Method TEX-460-A (Part I).

The material passing the No. 4 (4.75 mm) sieve and retained on the No. 10 (2.00 mm) sieve must be the produced from crushing aggregate that was originally retained on the No. 4(4.75 mm) sieve.

c. Reclaimed Asphalt Pavement (RAP): RAP is defined as a salvaged, milled, pulverized, broken or crushed asphaltic pavement. The RAP to be used in the mix shall be crushed or broken to the extent that 100 percent will pass the 2-inch (50 mm) sieve.

The RAP shall be stockpiled in such a manner that assures that it will not become contaminated by dirt or other objectionable materials. Stockpiled, crushed RAP must not exhibit a decantation more than 5 percent or a plasticity index more than 8, when tested in accordance with TxDOT Test Method Tex-406-A, Part I, or Test Method Tex-106-E, respectively.

d. Fine Aggregate: Fine aggregate is defined as that part of the aggregate passing the No.

10 (2.00 mm) sieve and shall be of uniform quality throughout. A maximum of 15 percent of the total aggregate may be field sand or other uncrushed fine aggregate.

Screenings shall be supplied from sources whose coarse aggregate meets the abrasion and magnesium sulfate soundness loss requirements shown in Table 2.

Unless indicated, stone screenings, which are the product of a rock crushing operation, are required and shall meet the following gradation requirements when tested in accordance with TxDOT Test Method Tex- 200-F, Part I.

Crushed gravel screenings may be used with, or in lieu of, stone screenings only when indicated. Crushed gravel screenings must be the product of crushing aggregate that was originally retained on the No. 4 (4.75 mm) sieve and must meet the gradation for stone screenings shown above.

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e. Mineral Filler: Mineral filler shall consist of thoroughly dried stone dust, Portland cement, fly ash, lime or other mineral dust approved by the COR. The mineral filler shall be free from foreign matter and meet the requirements shown in Table 3.

f. Asphaltic Material:

i. Paving Mixture. Asphalt cement for the paving mixture shall conform to the requirements of Standard Specification for AC-20 or PG64-22, Styrene (SBS) Modified Asphalt Cement, AC-SBS Blend AC-45P or PG76- 22S, unless otherwise indicated.

g. Tack Coat: Furnish CSS-1H, SS-1H, or a PG binder with a minimum high-temperature grade of PG 58 for tack coat binder. Do not dilute emulsified asphalts at the terminal, in the field, or at any other location before use.

h. Additives: Additives to facilitate mixing and/or improve the quality of the asphaltic mixture or tack coat may be used with the authorization of the COR. The Contractor may choose to use either lime or a liquid anti-stripping agent to reduce moisture susceptibility of the aggregate.

4. EQUIPMENT: The trucks that deliver the hot mix asphalt concrete material to the project shall be of sufficient number to insure a continuous paving operation. All equipment used for the production, placement and compaction of the mixture shall be maintained in good repair and operating conditions to the satisfaction of the COR.

5. CONSTRUCTION: Produce, haul, place, and compact the specified paving mixture. In addition to tests required by the specification, Contractors may perform other QC tests as deemed necessary. Schedule and participate in a pre-paving meeting with the COR on or before the first day of paving unless otherwise directed.

a. Mixture Temperature: The Contractor shall select a target temperature for discharge of the HMA mixture from the mixer between 250F (120C) and 350F (176C) that is suitable to weather and Project conditions. The target temperature shall be reported to the COR daily and recorded in the Daily Progress Report. The HMA mixture temperature shall not vary by more than 25F (14C) from the target temperature for discharge from the mixer. HMA mixtures that are discharged from the mixer at a temperature exceeding 360F (18oC) or a temperature more than 50oF (28C) below the target temperature shall not be accepted and shall not be placed on the Project

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b. The HMA paving mixture, when placed with a spreading and finishing machine, shall not be placed when the air temperature is below 50F (10C) and is falling, but it may be placed when the air temperature is above 40F (4C) and is rising.

c. Tack Coat. Clean the surface before placing the tack coat. Apply at a rate of 0.05 gal.

per square yard of surface area adjust as necessary. Apply a uniform tack coat at the specified rate unless otherwise directed. Apply the tack coat in a uniform manner to avoid streaks and other irregular patterns. Apply a thin, uniform tack coat to all contact surfaces of curbs, structures, and all joints. Allow adequate time for emulsion to break completely before placing any material. Prevent splattering of tack coat when placed adjacent to curb, gutter, and structures. Roll the tack coat with a pneumatic-tire roller to remove streaks and other irregular patterns when directed.

d. Transporting Hot Mix Asphaltic (HMA) Concrete: The HMA mixture shall be hauled to the Work site in tight vehicles that were previously cleaned of all foreign material.

Dispatching of the vehicles shall normally be arranged so that all material delivered is placed and all rolling completed during daylight hours.

e. HMA Placement: The HMA mixture shall be dumped and spread on the approved prepared surface with the spreading and finishing machine. When properly compacted, the finished pavement shall be smooth, of uniform texture and density and shall meet the requirements of the typical cross sections and the surface tests. In addition the placement of the HMA mixture shall be done without tearing, shoving, gouging or segregating the mixture and without producing streaks in the HMA layer.

i. Discharge of the HMA mixture into the finishing machine shall be controlled so that the spreading and finishing machine is not bounced or jarred and the required lines and grades shall be obtained without resorting to hand finishing except as permitted below in this Section.

ii. Unless indicated, dumping of the HMA material in a windrow and then placing the HMA mixture in the finishing machine with windrow pick-up equipment will be permitted provided the temperature of the HMA mixture does not drop more than 50oF (28oC) below the target temperature before being placed by the finishing machine.

iii. Under no circumstances will the HMA material be permitted to be dumped on or near the job site and then reloaded for hauling to the site of placement.

iv. The windrow pick-up equipment shall be operated in such a manner that substantially all the mixture deposited on the roadbed or prepared surface is picked up and loaded into the finishing machine without contamination by foreign material. The windrow pick-up equipment will also be so operated that the finishing machine will obtain the required line, grade and surface without resorting to hand finishing. Any operation of the windrow pick-up equipment resulting in accumulation and subsequent shedding of accumulated material into the HMA mixture will not be permitted.

v. When approved by the COR, level-up courses may be spread with a motor grader that meets the requirements of this specification item.

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vi. The spreading and finishing machine shall be operated at a uniform forward speed consistent with the plant production rate, hauling capability and roller train capacity to result in a continuous operation. Stopping of the spreading and finishing machine between trucks is to be held to a minimum. If, in the opinion of the COR, delivery of material is adversely affecting the condition of the HMA layer (excessive stopping of the spreading and finishing machine, loss of mixture temperature, etc.), the COR may require paving operations to cease until acceptable methods are provided to minimize starting and stopping of the spreading and finishing machine.

vii. The hopper gates of the spreading and finishing machine shall be adjusted to provide an adequate and consistent flow of material. This shall result in enough material being delivered to the augers so that they are operating approximately 85 percent of the time or more. The augers shall provide means to supply adequate flow of material to the center of the paver. Augers shall supply an adequate flow of material for the full width of the mat being placed, as approved by the Engineer or designated representative. Augers should be kept approximately one-half to three-quarters full of HMA mixture at all times during the paving operation.

viii. When the HMA mixture is placed in a narrow strip along the edge of an existing pavement, or is used to level up small areas of an existing pavement or is placed in small irregular areas where the use of a finishing machine is not practical, the finishing machine may be eliminated when permitted by the

COR.

ix. The paving material adjacent to castings and flush curb and gutter and structures shall be finished uniformly high so that when compacted, it will be slightly above but not more than 1/8 inch (3 mm) above the edge of the casting or gutter lip.

1. Compaction: The pavement layers/lifts shall be compacted thoroughly and uniformly to obtain the compaction and cross section meeting the requirements indicated in this specification item. Final density shall be 95% of mix design maximum density.

i. Regardless of the method used for compaction, all rolling to achieve specified density shall cease before the temperature of the HMA mixture drops below 175F (80C).

ii. Rolling with a pneumatic tire roller shall be used to seal the surface. Rolling with a tandem or other steel-wheel roller shall be provided if required to iron out any roller marks. Surface sealing and removal of roller marks may be accomplished at HMA temperatures below 175F (80C).

iii. Vibratory rollers shall not be allowed in the vibrating mode on layers with a plan thickness less than 1-1/2 inches (37.5 mm).

iv. The motion of the rollers shall be slow enough to avoid other than usual initial displacement. If any displacement occurs, it shall be corrected to the satisfaction of the Engineer or designated representative.

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v. The roller shall not be allowed to stand on pavement, which has not been compacted to minimum density requirements. In order to prevent adhesion of the surface mixture to the steel-wheel rollers, the wheels shall be thoroughly moistened with water; however an excess of water will not be allowed.

Necessary precautions shall be taken to prevent the dropping of diesel, gasoline, oil, grease or other foreign matter on the pavement, either when the rollers are in operation or when standing.

vi. The edges of the pavement along curbs, headers and similar structures, and all places not accessible to the roller, or in such positions as will not allow thorough compaction with the rollers, shall be thoroughly compacted with lightly oiled tamps.

vii. Rolling with a trench roller will be required on widened areas, in trenches and other limited areas where satisfactory density cannot be obtained with the approved rollers.

6. MEASUREMENT AND PAYMENT: Incorporated into the lump sum of the lime item to which this work is associated with.

400 Excavation and Backfill for Structures

1. DESCRIPTION: Excavate for placement and construction of structures and backfill structures.

2. SUBMITTALS: Submit material specification for approval prior to on-site work.

3. CONSTRUCTION:

Excavation

a. Excavate to the lines and grades shown on the plans or as directed. Provide slopes, benching, sheeting, bracing, pumping, and bailing as necessary to maintain the stability and safety of excavations up to 5 ft. deep.

i. Keep any topsoil that has been removed separate, and replace it, as nearly as feasible, in its original position when excavating for installation of structures across private property or beyond the limits of the embankment. Restore the area to an acceptable condition.

ii. Dispose of material not incorporated into the final project at a designated area with the park as directed by the COR.

b. Culverts and Storm Drains. When the design requires special bedding conditions for culverts or storm drains, an excavation diagram will be shown on the plans. Do not exceed these limits of excavation. Construct pipe structures in an open cut with vertical sides extending to a point 1 ft. above the pipe unless otherwise shown on the plans. When site conditions or the plans do not prohibit sloping the cut, the excavation may be stepped or laid back to a stable slope beginning 1 ft. above the pipe. Maintain the stability of the excavation throughout the construction period. Construct the embankment for pipe to be installed in fill above natural ground to an elevation at least 1 ft. above the top of the pipe, and then excavate for the pipe.

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c. Unstable Material. Remove the material to a depth of no more than 2 ft. below the grade of the structure when unstable soil is encountered at established footing grade, unless the Engineer authorizes additional depth. Replace soil removed with stable material in uniform layers no greater than 8 in. deep (loose measurement). Each layer must have enough moisture to be compacted by rolling or tamping as required to provide a stable foundation for the structure.

Backfill

a. General. Backfill the excavation after placement of the permanent structure as soon as practical. Use backfill free from stones large enough to interfere with compaction;

large or frozen lumps that will not break down readily under compaction; and wood or other extraneous material. Backfill material shall be similar to the material gradation shown or approved by the COR.

b. Place backfill in layers no greater than 10 in. deep (loose measurement) in areas not supporting a completed roadbed, retaining wall, or embankment. Place backfill in uniform layers no greater than 8 in. deep (loose measurement) in areas supporting a portion of a roadbed, retaining wall, or embankment. Compact each layer to meet the density requirements of the roadbed, retaining wall, embankment material, or as shown on the plans.

c. Bring each layer of backfill material to the moisture content needed to obtain the required density. Use mechanical tamps or rammers to compact the backfill. Rollers may be used to compact backfill if feasible.

d. Use approved bedding material for storm piping and inlets. Use marking tape to designate pipe location. Backfill using approved base material.

465 Junction Boxes, Manholes, and Inlets

1. DESCRIPTION: Construct junction boxes, manholes, and inlets, complete in place or to the stage detailed, including furnishing and installing frames, grates, rings, and covers.

2. SUBMITTALS: Submit material specification for approval prior to on-site work.

3. MATERIALS: Cast-in-place or precast junction boxes, manholes, inlets, risers, and appurtenances are acceptable unless otherwise shown. Alternate designs for must conform to functional dimensions and design loading. Alternate designs must be designed and sealed by a licensed professional engineer and approved by the COR.

a. Other Materials. Use commercial-type hardware as approved.

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4. CONSTRUCTION:

a. Excavation, Shaping, Bedding, and Backfill. Excavate, shape, bed, and backfill in accordance with Item 400, “Excavation and Backfill for Structures.” Immediate backfilling is permitted for all junction box, manhole, and inlet structures where joints consist of rubber boots, rubber gaskets, or bulk or preformed joint sealant. Take precautions in placing and compacting the backfill to avoid any movement of junction boxes, manholes, and inlets. Remove and replace junction boxes, manholes, and inlets damaged by the Contractor at no expense.

b. Junction Boxes, Manholes, and Inlets for Box Storm Drains. Place bases or risers of junction boxes, manholes, and inlets for box storm drains before or in conjunction with placement of the storm drain. Backfill the junction box, manhole, or inlet and storm drain as a whole.

c. Inverts. Shape and route floor inverts passing out or through the junction box, manhole, or inlet as shown on the plans or to drain. Shape by adding and shaping mortar or concrete after the base is placed or by placing the required additional material with the base.

471 Frames, Grates, Rings, and Covers

1. DESCRIPTION: Furnish and install frames, grates, rings, and covers for inlets, manholes, and other structures.

2. SUBMITTALS: Submit material specification for approval prior to on-site work.

3. MATERIALS: Frame, Grate, Ring, and Cover Castings. Provide clean castings conforming to the shape and dimensions shown on the plans as approved by the COR.

4. CONSTRUCTION: Construct and install frames, grates, rings, and covers in accordance with the details shown on the plans.

5. MEASUREMENT AND PAYMENT: Incorporated into the lump sum of the lime item to

481 Pipe for Drains

1. DESCRIPTION: Furnish and install pipe for drains.

2. SUBMITTALS: Submit material specification for approval prior to on-site work.

3. MATERIALS: Furnish polyvinyl chloride (PVC) pipe meeting the requirements of ASTM

D1785, Schedule 40, and furnish PVC fittings meeting the requirements of ASTM D2466.

PVC pipe and fittings meeting the requirements of ASTM D3034, Type SDR 35 may be used for installations encased in concrete or buried in soil.

a. Furnish a manufacturer’s certification stating the material meets the appropriate ASTM specification for approval by the COR

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4. CONSTRUCTION: Excavate and backfill for pipe installation in accordance with Item 400, “Excavation and Backfill for Structures.” Install pipe as shown on the plans or as directed.

Solvent-weld all fittings, including splice fittings, to provide a watertight fit. Do not splice straight sections of pipe at intervals shorter than 20 ft. unless at the end of a run or otherwise approved. Degrease all exposed PVC pipe and fittings, and apply an acrylic water-based primer followed by a coating of the same color used for adjacent concrete surface unless otherwise shown on the plans. Follow manufacturer’s specifications for installation of other types of pipe (material other than PVC) when indicated.

506 Temporary Erosion, Sedimentation, and Environmental Controls

1. DESCRIPTION: Install, maintain, and remove erosion, sedimentation, and environmental control measures to prevent or reduce the discharge of pollutants in accordance with the Storm Water Pollution Prevention Plan (SWP3) on the plans and the Texas Pollutant Discharge Elimination System (TPDES) General Permit TXR150000. Control measures are defined as Best Management Practices used to prevent or reduce the discharge of pollutants.

Control measures include, but are not limited to, rock filter dams, temporary pipe slope drains, temporary paved flumes, construction exits, earthwork for erosion control, pipe, construction perimeter fence, sandbags, temporary sediment control fence, biodegradable erosion control logs, vertical tracking, temporary or permanent seeding, and other measures.

Erosion and sediment control devices must be selected from the Erosion Control Approved Products or Sediment Control Approved Products lists. Perform work in a manner to prevent degradation of receiving waters, facilitate project construction, and comply with applicable federal, state, and local regulations. Ensure the installation and maintenance of control measures is performed in accordance with the manufacturer’s or designer’s specifications.

a. Provide the Contractor Certification of Compliance before performing SWP3 or soil disturbing activities. By signing the Contractor Certification of Compliance, the Contractor certifies they have read and understand the requirements applicable to this project pertaining to the SWP3, the plans, and the TPDES General Permit TXR150000. The Contractor is responsible for any penalties associated with non-performance of installation or maintenance activities required for compliance. Ensure the most current version of the certificate is executed for this project.

2. SUBMITTALS: Submit material specification for approval prior to on-site work.

3. EXPECTED MATERIALS: Temporary Sediment Control Fence. Provide a net-reinforced fence using woven geo-textile fabric. Logos visible to the traveling public will not be allowed.

a. Fabric. Provide fabric materials in accordance with DMS-6230, “Temporary Sediment Control Fence Fabric.”

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b. Posts. Provide essentially straight wood or steel posts with a minimum length of 48 in., unless otherwise shown on the plans. Furnish soft wood posts at least 3 in. in diameter, or use nominal 2 × 4 in. boards. Furnish hardwood posts with a minimum cross-section of 1-1/2 × 1-1/2 in. Furnish T- or L-shaped steel posts with a minimum weight of 1.3 lb. per foot.

c. Net Reinforcement. Provide net reinforcement of at least 12-1/2 gauge galvanized welded wire mesh, with a maximum opening size of 2 × 4 in., at least 24 in. wide, unless otherwise shown on the plans.

d. Staples. Provide staples with a crown at least 3/4 in. wide and legs 1/2 in. long.

e. Used Materials. Use recycled material meeting the applicable requirements if approved.

4. QUALIFICATIONS, TRAINING, AND EMPLOYEE REQUIREMENTS

a. Contractor Responsible Person Environmental (CRPE) Qualifications and

Responsibilities. Provide and designate in writing at the preconstruction conference a CRPE and alternate CRPE who have overall responsibility for the storm water management program. The CRPE will implement storm water and erosion control practices; will oversee and observe storm water control measure monitoring and management; will monitor the project site daily and produce daily monitoring reports as long as there are BMPs in place or soil disturbing activities are evident to ensure compliance with the SWP3 and TPDES General Permit TXR150000. During time suspensions when work is not occurring or on contract non-work days, daily inspections are not required unless a rain event has occurred. The CRPE will provide recommendations on how to improve the effectiveness of control measures. Attend the Department’s preconstruction conference for the project. Ensure training is completed as identified in Section 506.3.3., “Training,” by all applicable personnel before employees work on the project. Document and submit a list, signed by the CRPE, of all applicable Contractor and subcontractor employees who have completed the training. Include the employee’s name, the training course name, and date the employee completed the training. Provide the most current list at the preconstruction conference or before SWP3 or soil disturbing activities. Update the list as needed and provide the updated list when updated.

b. Contractor Superintendent Qualifications and Responsibilities. Provide a superintendent that is competent, has experience with and knowledge of storm water management, and is knowledgeable of the requirements and the conditions of the TPDES General Permit TXR150000. The superintendent will manage and oversee the day to day operations and activities at the project site; work with the CRPE to provide effective storm water management at the project site; represent and act on behalf of the Contractor; and attend the Department’s preconstruction conference for the project.

c. Training. All Contractor and subcontractor employees involved in soil disturbing activities, small or large structures and, SWP3 (storm water control measures, soil

PMIS 228351 Reconstruct Taxiway RT 906 Page 20 retention blankets, seeding, sodding, etc.) activities must complete the following training before performing soil disturbing or SWP3 activities on the project. Training is provided by the Department at no cost to the Contractor and is valid for 3 yr. from the date of completion. The Engineer may require training at a frequency less than 3

yr. based on environmental needs.

i. “Environmental Management System: Awareness Training for the Contractor (English and Spanish) (Approximate running time 20 min.)”