Attachment 7 - Final Additional Specs Veterans Point Trail.pdf

Section 915 – Trail Heave and Pothole Repair

Description

915.01 Work. Work consists of repairing marked sections of trail that are damaged by heaving and potholes. Sections of work shall be identified and marked by Government. Repair sections shall be full trail width. Work shall include: clearing and cleaning; removing slough; cutting existing pavement; removing pavement and bas course and underlying saturated materials;

removing rocks, roots, stumps, slough, and other subsurface obstales causing pavement failure;

restoring the original trail template, including filling ruts and troughs, placing base course and asphalt.

Materials

915.02 Requirements. Use materials meeting the requirements of the following sections:

941 --------- Aggregate Surfacing and Base Course 942 -------- Hot Bituminous Plant Mix Trail Surfacing 988 --------- Slough and Berm Removal Material for Timber Structures

Construction

915.03 Clearing and Grubbing. Clear trail of natural material, debris and slough materials at locations identified for Trail Heave and Pot Hole Repair as marked by Government.

915.04 Excavation and Embankment. Excavate and place all excavated material in accordance with the requirements of Section 912.

Saw-cut existing asphalt as marked by Government. Cuts shall be full width.

Remove asphalt and base course.

Remove rocks, roots and saturated underlying material.

915.05 Rock and Root Removal. Uniformly scatter the removed rocks and roots below the trailway and distribute to ensure no blockage of water courses or creation of a windrow. Fill holes with suitable material and compact.

915.06 Slough and Berm Removal and Excess Material. Use suitable slough and berm material within the trailway to restore the trailbed as shown on the drawings. Place all unsuitable and excess material beyond the downslope edge of the trailbed and uniformly spread to a depth not exceeding 4 inches and so as not to obstruct drainage or interfere with the drainage of outsloped tread, unless directed otherwise by Government.

Remove berm when daylight can be obtained within a distance of 5 feet from the outslope edge of finished tread unless otherwise designated on the ground or shown on the drawings.

915.07 Fill Material and Borrow. Use suitable material to fill ruts, troughs, and potholes in the tread that cannot be leveled and outsloped through performance of work in Subsection 915.06.

Compact and shape as shown on the drawings.

Obtain borrow from areas shown on the drawings or designated on the ground Fill material shall be Aggregate Base Course Material from Commerical Source approved by Government.

Minimum compacted aggregate depth shall be 6inches.

915.08 Asphalt

Please minimum 2 inch Hot mix asphalt in accordance with Section 942.

Heave and Pothole repairs shall be completed prior to application of Asphalt Seal Coat.

Apply Asphalt Seal Coat over cured hot mix asphalt.

915.09 Drainage. NOT USED

915.09 Stream Channel Cleaning. NOT USED

915.10 Check Dams. NOT USED

915.11 Switchbacks. NOT USED

915.12 Waterbars. NOT USED

915.13 Turnpikes. NOT USED

915.14 Trail Structures. NOT USED

915.15 Reshaping and Finishing Trailbed and Backslopes. NOT USED

Measurement

915.16 Method. Measure the quantities in accordance with Section 906.

Payment

915.17 Basis. Pay for the accepted quantities in accordance with Section 906 at the contract unit price for each PAY ITEM SHOWN IN THE SCHEDULE OF ITEMS.

Make payment under:

PAY ITEM PAY UNIT

915(01) Trail Restoration ...................................................................L.F.

Section 941 - Aggregate Surfacing and Base Course

941.01 Work. This work consists of furnishing, hauling, watering, placing, and compacting aggregate surfacing or base course; furnishing and installing retainers; and geosynthetics.

Materials

941.02 Requirements. Use materials meeting the requirements of the following sections:

961 --------- Rock, Grid Pavement Units, and Aggregate 962 --------- Material for Timber Structures 964 --------- Geosynthetics

Produce aggregate by pit run, screening, or crushing. Obtain materials from sources SHOWN ON THE DRAWINGS or other sources approved by the CO in writing.

941.03 Handling Materials. Stockpile, remove, transport, and spread aggregates in a manner that will preserve specified gradation and avoid contamination. Do not intermingle stockpiles of aggregate having different gradations.

941.04 Sampling Aggregate. Submit test results and a Certificate of Compliance verifying that aggregate gradation meets contract requirements. Sample the material before incorporation into the work as follows:

(a) for onsite-produced materials at crushing or screening plants, after additions of any necessary blending material.

(b) for commercially produced aggregates, at the producer’s plant or stockpile.

The sampling will not be considered a final acceptance and will not preclude later sampling and testing after final processing of the material. Such sampling does not relieve the contractor of responsibility of providing quality control measures to ensure compliance with contract requirements.

Construction

941.05 Preparation of Subgrade. Prepare and finish trailbed as required under Section 912.

Obtain written approval of the CO before placing aggregate.

941.06 Spreading and Compacting. Use aggregate that is uniformly mixed at optimum moisture content and spread and compact in layers to the final thickness and width SHOWN ON THE DRAWINGS. The maximum thickness of any one layer shall be 3 inches. Obtain compaction by one of the following methods as SHOWN IN THE SCHEDULE OF ITEMS:

(a) by hand, using nonmechanized compaction tools over the full area of each layer until visual displacement ceases;

(b) by mechanical vibratory compactors over the full area of each layer until visual displacement ceases, but not fewer than three complete passes;

(c) by using a roller or mechanical hand tamper until the density is at least 90 percent of the maximum density, as determined by AASHTO T 99, Method C or D.

Immediately following final spreading, smoothing, and compacting, correct any irregularities or depressions that develop by adding or removing material until the surface is smooth, uniform, and compacted.

941.07 Acceptance, Testing, Sampling, and Tolerances. Do not vary the total compacted thickness of the aggregate by more or less than ½ inch from the specified thickness or place it consistently below or above the specified depth.

Do not vary the aggregate width by more than ± 3 inches from the specified width or place it consistently narrower or wider than the specified width.

941.08 Timber, Log, or Rock Retainers. Bed retainers along their entire length and as SHOWN

ON THE DRAWINGS.

Measurement

941.09 Method. Measure the quantities in accordance with Section 906.

Payment

941.10 Basis. Pay for the accepted quantities in accordance with Section 906 at the contract unit price of each PAY ITEM SHOWN IN THE SCHEDULE OF ITEMS.

Section 942 - Hot Bituminous Plant Mix Trail Surfacing

942.01 Work. This work consists of constructing a single course of hot bituminous plant mix on a prepared base course or trailbed and furnishing or installing retainers and geosynthetics.

Materials

942.02 Requirements. Use materials meeting the requirements of the following sections:

962 --------- Material for Timber Structures 964 --------- Geosynthetics

Use hot plant mix design that is currently in use by the local State department of transportation, the county, or city, and submit a certificate of compliance that the mix meets their requirements.

Certify the locations of past projects for the CO’s inspection prior to approval.

Construction

942.03 Weather Limitations. Do not place the bituminous mixture when weather conditions prevent the proper compaction of the mixture, the base course is frozen, or the average temperature of the underlying surface upon which the bituminous mixture is to be placed is less than 55 °F. Do not place when it is raining or snowing.

942.04 Mixing. Do not allow the temperature of the mix to exceed 320 °F when discharging from the mixer.

942.05 Surface Preparation. Remove loose aggregate, soil, or other deleterious materials from the surface to be paved. Prepare base or trailbed by shaping, watering, and compacting before placing plant mix. Obtain the CO’s approval before placing plant mix on prepared base.

942.06 Placement and Compaction. Place and compact plant mix to meet the lines, grades, and thicknesses SHOWN ON THE DRAWINGS. Avoid segregation of the mix. Hand or small machine placement of mix is permitted, except where the use of bituminous paving machines is required for areas SHOWN ON THE DRAWINGS. Use only self-contained, power propelled paving machine units, provided with an adjustable activated screed or strike-off assembly, heated if necessary, and capable of spreading and finishing courses of bituminous plant mix to the required widths and thicknesses.

Start compaction when the mix is above 230 °F. Compact the mix with at least three passes over the entire trail surface. Use a steel wheel power roller that is of a minimum weight of 1 Ton. Use vibratory plate compactors in areas that are not accessible to rollers. Continue compaction over the full width of the layer until visible deformation of the layer ceases.

942.07 Thickness. Do not vary the thickness of the compacted hot mix by more or less than 15 percent from the thickness SHOWN ON THE DRAWINGS and not consistently above or below the specified thickness.

942.08 Retainers. Bed retainers along their entire length and as SHOWN ON THE

DRAWINGS.

Measurement

942.09 Method. Measure the quantities in accordance with Section 906.

Payment

942.10 Basis. Pay for the accepted quantities in accordance with Section 906 at the contract unit price for the PAY ITEM SHOWN IN THE SCHEDULE OF ITEMS.

942(01) Hot Bituminous Plant Mix Trail Surfacing ...........................S.Y.

942(02) Hot Bituminous Plant Mix Trail Surfacing ...........................lbs

942(03) Retainers ...............................................................................L.F.

942(04) Geosynthetics ........................................................................S.Y.

Section 988 - Slough and Berm Removal

988.01 Work. Work consists of the removal and disposal of slough and berm material that has accumulated on the trailway.

Requirements

988.02 Slough and Berm Removal and Excess Material. Remove all slough material within the trailway. Remove all material from the trailbed when daylight can be obtained within a distance of 5 feet from the outslope edge of the finished tread unless otherwise DESIGNATED ON THE GROUND or SHOWN ON THE DRAWINGS. Conserve and use suitable material to restore the trail tread as SHOWN ON THE DRAWINGS.

Place all excess and unsuitable material beyond the downslope edge of the trailbed. Uniformly spread to a depth not exceeding 4 inches and do not obstruct drainage or interfere with the drainage of outsloped tread.

Measurement

988.03 Method. Determine the quantity of slough and berm removal units by measuring the slope distance along the trail centerline.

Payment

988.04 Basis. Pay for the accepted quantities at the unit price SHOWN IN THE SCHEDULE OF

ITEMS.

988(01) Slough and Berm Removal ......................................................L.F.

988(02) Slough and Berm Removal ......................................................LS

ASPHALT PAVING 321216 - 1

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SECTION 321216 - ASPHALT PAVING

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Hot-mix asphalt paving.

2. Hot-mix asphalt overlay.

3. Cold milling of existing asphalt pavement.

4. Hot-mix asphalt patching.

1.2 ACTION SUBMITTALS

A. Hot-mix asphalt designs.

1.3 INFORMATIONAL SUBMITTALS

A. Material Certificates:

1. Aggregates.

2. Asphalt binder.

3. Tack/Seal coat.

1.4 QUALITY ASSURANCE

A. Regulatory Requirements: Comply with materials, workmanship, and other applicable requirements of South Dakota Department of Transportation (SD DOT) for asphalt paving work.

1. Measurement and payment provisions and safety program submittals included in standard specifications do not apply to this Section.

PART 2 - PRODUCTS

2.1 AGGREGATES

A. Coarse Aggregate: ASTM D692/D692M, sound; angular crushed stone, crushed gravel, or gravel mixed with milled asphalt as approved by Contracting Officer.

B. Fine Aggregate: ASTM D1073 sharp-edged natural sand or sand prepared from stone, gravel, , or combinations thereof as approved by Contracting Officer.

2.2 ASPHALT MATERIALS

A. Asphalt Binder: ASTM D6373 binder designation typical of materials used by SD DOT.

B. Asphalt Cement: ASTM D3381/D3381M for viscosity-graded material.

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C. Tack Coat and Seal Coat: ASTM D977 emulsified asphalt, or ASTM D2397/D2397M cationic emulsified asphalt, slow setting, diluted in water, of suitable grade and consistency for application.

2.3 AUXILIARY MATERIALS

A. Recycled Materials for Hot-Mix Asphalt Mixes: Reclaimed asphalt pavement; reclaimed, unbound-aggregate base material; and recycled materials acceptable to SD DOT from sources and gradations that have performed satisfactorily in previous installations, equal to performance of required hot-mix asphalt paving produced from all new materials.

2.4 MIXES

A. Recycled Content

1. Surface Course Limit: Recycled content no more than amount allowed by SD DOT. In absence of SD DOT Recycled Content limitations, limit Recycled Content to10 percent by weight.

B. Hot-Mix Asphalt: Dense-graded, hot-laid, hot-mix asphalt plant mixes designed in accordance with SD DOT requirements. and complying with the following requirements:

1. Provide mixes with a history of satisfactory performance in geographical area where Project is located.

PART 3 - EXECUTION

3.1 COLD MILLING

A. Clean existing pavement surface of loose and deleterious material immediately before cold milling. Remove existing asphalt pavement by cold milling to grades and cross sections indicated.

1. Mill to full depth of existing asphalt profile.

2. Patch surface depressions deeper than 1 inch (25 mm) after milling, before asphalt is laid.

3.2 PATCHING

A. Asphalt Pavement: Saw cut perimeter of patch and excavate existing pavement section (asphalt pavement and base course) to sound base. Excavate rectangular or trapezoidal patches, extending 12 inches (300 mm) into perimeter of adjacent sound pavement, unless otherwise indicated. Cut excavation faces vertically. Remove excavated material. Recompact existing unbound-aggregate base course to form new subgrade.

B. Tack Coat/Seal Coat: Before placing patch material, apply tack coat uniformly to vertical asphalt surfaces abutting the patch. Apply at a rate of 0.05 to 0.15 gal./sq. yd. (0.2 to

0.7 L/sq. m).

1. Allow tack coat to cure undisturbed before applying hot-mix asphalt paving.

2. Avoid smearing or staining adjoining surfaces, appurtenances, and surroundings. Remove spillages and clean affected surfaces.

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C. Placing Patch Material: Fill excavated pavement areas with hot-mix asphalt base mix for full thickness of patch and, while still hot, compact flush with adjacent surface.

3.3 SURFACE PREPARATION

A. Ensure that prepared subgrade is ready to receive paving. Immediately before placing asphalt materials, remove loose and deleterious material from substrate surfaces.

3.4 HOT-MIX ASPHALT PLACEMENT

A. Machine place hot-mix asphalt on prepared surface, spread uniformly, and strike off. Place asphalt mix by hand in areas inaccessible to equipment in a manner that prevents segregation of mix. Place each course to required grade, cross section, and thickness when compacted.

1. Place hot-mix asphalt surface course in single lift.

2. Spread mix at a minimum temperature of 250 deg F (121 deg C).

3. Regulate paver machine speed to obtain smooth, continuous surface free of pulls and tears in asphalt-paving mat.

B. Place paving in consecutive strips not less than full trail width wide unless infill edge strips of a lesser width are required.

C. Promptly correct surface irregularities in paving course behind paver. Use suitable hand tools to remove excess material forming high spots. Fill depressions with hot-mix asphalt to prevent segregation of mix; use suitable hand tools to smooth surface.

3.5 JOINTS

A. Construct joints to ensure a continuous bond between adjoining paving sections. Construct joints free of depressions, with same texture and smoothness as other sections of hot-mix asphalt course.

1. Clean contact surfaces and apply tack coat to joints.

2. Offset longitudinal joints, in successive courses, a minimum of 6 inches (150 mm).

3. Offset transverse joints, in successive courses, a minimum of 24 inches (600 mm).

4. Construct transverse joints at each point where paver ends a day's work and resumes work at a subsequent time. Construct these joints using either "bulkhead" or "papered" method in accordance with AI MS-22, for both "Ending a Lane" and "Resumption of Paving Operations.

3.6 COMPACTION

A. General: Begin compaction as soon as placed hot-mix paving will bear roller weight without excessive displacement. Compact hot-mix paving with hot hand tampers or with vibratory-plate compactors in areas inaccessible to rollers.

1. Complete compaction before mix temperature cools to 185 deg F (85 deg C).

B. Breakdown Rolling: Complete breakdown or initial rolling immediately after rolling joints and outside edge. Examine surface immediately after breakdown rolling for indicated crown, grade, and smoothness. Correct laydown and rolling operations to comply with requirements.

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C. Intermediate Rolling: Begin intermediate rolling immediately after breakdown rolling while hot-mix asphalt is still hot enough to achieve specified density. Continue rolling until hot-mix asphalt course has been uniformly compacted to the following density:

1. Average Density, Rice Test Method: 92 percent of reference maximum theoretical density in accordance with ASTM D2041/D2041M, but not less than 90 percent or greater than 96 percent.

D. Finish Rolling: Finish roll paved surfaces to remove roller marks while hot-mix asphalt is still warm.

E. Edge Shaping: While surface is being compacted and finished, trim edges of pavement to proper alignment. Bevel edges while asphalt is still hot; compact thoroughly.

F. Protection: After final rolling, do not permit vehicular traffic on pavement until it has cooled and hardened.

G.

H. Erect barricades to protect paving from traffic until mixture has cooled enough not to become marked.

3.7 INSTALLATION TOLERANCES

A. Pavement Thickness: Compact each course to produce thickness indicated within the following tolerances:

1. Base Course: Plus or minus 1/2 inch (13 mm).

2. Surface Course: Plus 1/4 inch (6 mm), no minus.

B. Pavement Surface Smoothness: Compact each course to produce surface smoothness within the following tolerances as determined by using a 4-foot straightedge applied transversely or longitudinally to paved areas:

1. Base Course: 1/4 inch (6 mm)

2. Surface Course: 1/8 inch (3 mm)

3.8 WASTE HANDLING

A. General: Handle asphalt-paving waste in accordance with approved waste management plan required in Section 017419 "Construction Waste Management and Disposal."

END OF SECTION 321216

C. Placing Patch Material: Fill excavated pavement areas with hot-mix asphalt base mix for full thickness of patch and, while still hot, compact flush with adjacent surface.