Attachment 1 - Specifications.pdf

NATIONAL FORESTS IN NORTH CAROLINA

APPALACHIAN RANGER DISTRICT

ROAN MOUNTAIN RECREATION AREA

OBSERVATION DECK REPLACEMENT

AND

ACCESS TRAILS RECONSTRUCTION

JANUARY 2010

NFs in NC Engineering, Heritage, and Recreation

Facilities Group

SPECIFICATION INDEX

DIVISION 1 - GENERAL REQUIREMENTS

01010 - Summary of Work 01050 - Field Engineering 01300 – Submittals

DIVISION 2 - SITE WORK

02110 – Clearing 02210 - Site Grading 02220 - Structural Excavation 02250 - Compaction Control and Testing 02400 - Sheeting, Shoring, and Bracing 02540 – Erosion and Sedimentation Control 02740 – Plant mix Bituminous Pavement 02821 – Seeding

DIVISION 3 - CONCRETE

03100 - Concrete Formwork 03200 - Concrete Reinforcement 03300 - Cast-in-Place Concrete 03310 - Concrete from Packaged Dry Mix for Minor Structures

DIVISION 5 - METALS

05500 - Metal Fabrications

DIVISION 6 - WOOD AND PLASTICS

06100 – Carpentry

DIVISION 7 - THERMAL AND MOISTURE

07110 - Membrane Waterproofing

DIVISION 9 - FINISHES

09900 - Painting

SECTION 01010

SUMMARY OF WORK

PART 1 - GENERAL

A. The Contractor is to provide the complete construction of the observation deck and the reconstruction of the existing trails as specified herein and as shown on the drawings.

B. Permits

None required.

C. Coordination

1. Construction activities shall be coordinated with the Assistant District Ranger, David McFee through the project COR.

D. Storage of Materials

1. The Contractor may store materials and equipment at the work site at his own risk. All materials must be kept in an area designated by the C.O. and be neat and orderly.

2. The Contractor shall install barricades or tape barriers around all open excavations and storage areas.

E. Construction Schedule

1. A proposed schedule of work for the project construction shall be submitted to the C.O. for approval

10 days prior to starting construction.

2. The Contractor must be prepared to furnish the necessary manpower and equipment to complete the project within the specified time period.

3. The area will be closed to the public during the life of the contract, except for the rhododendrum blooming season (June 7th thru July 6th). Construction activities will be allowed to continue during this period except for deliveries of materials and equipment in trucks larger than a 4x4 Crew Cab pickup truck.

4. Construction sequence shall be as follows:

a. Construction activities before July 6th will be limited to demolition and reconstruction of trails on loops #2 and #3 below the access to the Observation Deck.

b. After July 6th the Contractor can work on all areas of the project until completion.

F. Existing Facilities

1. The Contractor must furnish and maintain a portable toilet.

2. The Contractor must furnish electrical generators as needed.

3. There is potable water at the site. The water system is seasonal and is closed from September through May. The Contractor will have access to potable water during the open season.

G. Project Closeout

1. Not applicable.

SECTION 01050

FIELD ENGINEERING

A. The locations of all proposed new work relative to existing features are indicated on the construction drawings.

B. The Contractor shall be responsible for field layout and construction staking of all items of work.

SECTION 01300

SUBMITTALS

A. The Contractor shall be required to furnish the following to the C.O. prior to commencing any work that relates to a respective submittal (three copies of all submittals required).

1. Concrete mix design including concrete coloring.

2. Decking material including hardware.

3. Any other equipment that is a substitute for specified equipment.

B. The Contractor shall obtain approval in writing before installation of equipment.

SECTION 02110

CLEARING

A. The work area is a very sensitive area with a number of threatened or endangered plants and animals.

B. Clearing is not required for the project. The Contractor must take all necessary measurements not to disturd the existing vegetation including branches that may be overhanging the trail system.

PART 2 - PRODUCTS

A. None.

PART 3 - EXECUTION

A. Perform the work without disturbing the existing vegetation. Should any vegetation need to be removed it will require approval by the COR after consultation with the Zone Botanist.

SECTION 02210

SITE GRADING

A. This section covers all required site grading, asphalt surfacing removal and the final dressing of the site within the construction area.

PART 2 - PRODUCTS

A. Bedding material under concrete sidewalks and asphalt pavement shall be NC DOT approved ABC stone.

PART 3 - EQUIPMENT

A. The Contractor must utilize compact excavators such as the E32 Bobcat, utility vehicles for hauling such as the Bobcat 2200 4X4 Utility Vehicle and other equipment designed to maneuver easily in tight areas.

B. Some sections of the trail are narrow enough that the Contractor will be required to use hand tools and non motorized wheel buggies to accomplish the work.

PART 4 - EXECUTION

A. Excavation shall produce surfaces to line and grade shown on drawings. All excavated areas shall drain.

B.

Do not excavate outside the width of the existing trails.

C. Exterior fills shall be constructed to sections and elevations indicated. Exterior fills shall drain.

D. Compact bedding material under all surfaces.

1. Compaction shall be in accordance with Section 02250, Compaction Control and Testing.

E. When all exterior earthwork is completed, the Contractor shall give the entire site a final dressing to assure that all surfaces are in accordance with the elevations indicated on the drawings.

1. Finish grades adjacent to the Visitor Center Building shall be sloped to provide surface drainage away from the building in all directions.

SECTION 02220

STRUCTURAL EXCAVATION

A. This section consists of the necessary excavation for the installation of the deck foundations.

PART 2 - PRODUCTS

A. Silt fence in accordance with Section 02540.

PART 3 - EXECUTION

A. Install silt fences or other means of silt entrapment around all structural excavations.

B. Trenches or foundation pits for the deck piers and abutment shall be excavated to the lines, grades, and elevations as shown on the drawings. They shall be of size to permit the placing of the full width and length of the structure as shown on the drawings.

C. Boulders, logs, or other objectional material encountered in excavation shall be removed.

1. All rock or other hard foundation material shall be cleaned of all loose material, cut to a firm surface, either level, and stepped or serrated as specified herein.

2. All seams or crevices shall be cleaned out and grouted with neat cement grout.

3. All loose, disintegrated rock and thin strata shall be removed.

4. When concrete is to rest on a surface other than rock, special care shall be taken not to disturb the bottom of the excavation.

D.

After each excavation is completed, the Contractor shall notify the C.O. to that effect. No concrete shall be placed until after the C.O. has approved the depth of the excavation and the character of the foundation material.

SECTION 02250

COMPACTION CONTROL AND TESTING

PART 1 - GENERAL

A. This section covers all compaction for earth fills under footings, slabs, walkways and other backfill as shown on the drawings and specified herein.

PART 2 - PRODUCTS

A. Material used for fills and backfills shall be as described in Section 02210, Site Grading.

PART 3 - EXECUTION

A. The ground on which the fill or backfill material is to be placed shall be firm, dry, unfrozen, and cleared of all debris.

B. Compacted fills under concrete slabs, footings and walkways shall be compacted to a uniform density until no visible settlement occurs.

C. Backfill around structures and supports shall be done in 8" lifts and compacted to a uniform density until no visible settlement occurs.

D. Compaction shall be accomplished by the use of a mechanical compaction equipment and shall continue until no visual displacement occurs.

E. Compaction testing shall not be required.

SECTION 02400

SHEETING, SHORING, AND BRACING

A. Scope: Includes additional support that the sides of a trench or excavation may require to remain stable during construction operations.

PART 2 - PRODUCTS

A. Timber or metal members used by the Contractor shall provide adequate support of the soils during his work. The Contractor shall be responsible for selection of proper materials to maintain adequate support.

PART 3 - EXECUTION

A. Excavations and sides of trenches shall be supported with adequate materials as necessary for the safety of personnel and protection of the pipeline or sewerage tanks before backfilling.

B. The installation and removal of all lagging, sheeting, shoring, piling, and bracing shall be such to maintain the required trench or excavated section and to maintain the undisturbed state of the soils at and below the bottom of excavation.

C. Sheet piling and timbers in trench excavations shall be withdrawn in a manner to prevent damage to the pipe or tanks.

D. All sheeting and shoring shall be removed when safe to do so.

SECTION 02740

PLANT MIX BITUMINOUS PAVEMENT

PART 1 GENERAL

A. WORK INCLUDED

1. This work consists of the production, delivery, placement, and compaction of asphalt plant mixed surface as shown on the drawings and specified herein.

B. REFERENCES

AASHTO M 156-89 Requirements for Mixing Plants for Hot- Mixed, Hot-Laid Bituminous Paving Mixtures

NCDOTSS North Carolina Department of Transportation Standard Specifications for Roads & Structures

C. SUBMITTALS

1. The asphalt mix formula proposed for use by the subcontractor shall be a mix formula that has been previously certified by NC DOT as meeting the requirements of this specification. The subcontractor shall submit a letter of certification from the proposed asphalt mix supplier that verifies the intended formula meets said requirements.

2. The Contractor shall furnish with each shipment 2 copies of a delivery ticket. Both copies shall accompany the shipment and be delivered to the COR at the destination. The delivery ticket shall contain the following information: Delivery ticket number, date shipped, project or purchase order number, State Laboratory assigned batch number, destination, name of consignee, trailer or car number, supplier's storage tank or batch number, quantity loaded (pounds or gallons), specific gravity or pounds per gallon at 60°F., loading temperature, and net gallons at 60°F.

3. Certified reports of Inspections and laboratory tests as required by this specification shall be prepared by an independent testing laboratory.

4. In either case no asphalt materials shall be delivered to the job site prior to said certifications being received and/or accepted by the COR.

D. QUALITY PROGRAM REQUIREMENTS

1. The asphalt mixing plant shall meet the requirements of NCDOTSS , Section 610-5, Asphalt Mixture Production.

PART 2 PRODUCTS

A. ASPHALTIC CONCRETE - SURFACE COURSE

1. NCDOT Type S9.5B shall be used as a surface course and placed over the prepared aggregate base course as shown on the drawings.

PART 3 EXECUTION

A. GENERAL

1. The asphalt plant mix shall be produced, transported to the site, placed, and compacted in accordance with the applicable sections of NCDOTSS 610, Asphalt Plant Mix Pavements.

B. Conditioning of Existing Surface

1. Immediately before placing the bituminous mixture, the existing surface shall be cleaned of loose or deleterious material.

2. Contact surfaces of curbing, gutters, manholes, and other structures shall be painted with a thin, uniform coating of bituminous material prior to placing bituminous mixture against them.

3. The surfaces of adjacent structures shall be protected from spattering or marring during placement.

C. AGGREGATE SUBGRADE PREPARATION

1. All areas to receive new asphalt paving shall be graded to ensure continuous drainage.

1. Aggregate subgrade shall be approved in writing by the COR before asphalt paving begins.

D. ASPHALT PAVEMENT

1. Surface smoothness tolerances shall conform to NCDOTSS, Section 610-13 Surface Requirements.

2. Do not apply asphalt mixtures to a wet or frozen surface or when the air temperature is below 45 degrees F or when weather conditions are otherwise unfavorable. Any exceptions to these restrictions shall require written permission from the COR.

E. JOINTS

1. When the laying of the mixture is to be suspended long enough to permit the mixture to become chilled, a transverse joint shall be constructed.

2. A butt joint will be permitted, provided proper compaction is achieved. The joint shall be constructed square to the lane alignment and all excess material shall be discarded.

3. Before paving operations are resumed, the exposed edge of the previously constructed pavement shall be lightly coated with tack coat.

F. COMPACTION

1. Asphalt shall be uniformly compacted by rolling before the asphalt has cooled below 185 degrees F. Compaction equipment shall meet the requirements of NCDOTSS Section 610-10.

2. Asphalt shall be compacted to a density of at least 90% of the maximum specific gravity (density) as determined according to AASHTO T209 as part of the job-mix formula.

G. TESTING & INSPECTION

1. Not required.

SECTION 02540

EROSION AND SEDIMENTATION CONTROL

A. This work consists of temporary and permanent measures as shown on the drawings and as specified herein, to prevent and control soil erosion and sedimentation.

PART 2 - PRODUCTS

A. Silt fences shall be pre-fabricated with 1-½” square, hardwood posts, Mirafi Silt Fence, or approved equal.

B. Filter stone shall be ½ to ¾ inch aggregate NCDOT #57 or #5 washed stone.

C. Standard size hay or staw bales with 2” x 2” x 36” long stakes.

PART 3 - EXECUTION

A. Prior to start of construction, the Contractor shall submit to the C.O. for approval , a schedule for temporary and permanent sedimantation control work for each phase of the work.

C. The Contractor shall monitor the performance of all erosion and sediment control practices and make minor adjustment as needed on a day-to-day basis.

D. Temporary controls shall be dismantled and disposed of after the disturbed soil has benn re-vegetated.

SECTION 02821

SEEDING & MULCHING

A. Seeding and fertilizer is not allowed.

PART 2 - PRODUCTS

A. Mulching shall be straw applied at a rate of 1-2 tons per acre. Mulching shall be certified weed-free.

PART 3 - EXECUTION

A. Mulching operations shall be carried out in a timely manner following any and all backfill completion as directed by the C.O.

1. No work requiring erosion and sedimentation controls will be allowed to start until necessary controls for that particular phase of work have been installed as required.

B. All disturbed areas to be mulched shall be graded, leveled, and prepared to receive the mulch.

C. Straw shall be uniformly spread over the area at the rate specified.

SECTION 03100

CONCRETE FORMWORK

A. This section covers all formwork, expansion joints, and related accessories.

PART 2 - PRODUCTS

A. Forms shall be wood, plywood, hardboard, or metal and shall be approved by the C.O.

B. Form oil shall be nonstaining type.

C. Expansion joint filler shall be pressure treated Southern Yellow Pine boards. Treatment shall be 0.4 lbs/cf of approved treatment.

PART 3 - EXECUTION

A. Forms shall be built tight, in proper alignment and adequate to resist the stresses of concrete placement without deformation.

B. Forms shall be constructed to produce the required concrete surface.

C. Expansion and contraction joints shall be formed as indicated on the drawings.

D. Control joints shall be saw cut at the locations shown on the drawings. Joints shall be 1/5 the depth of the slab.

SECTION 03200

CONCRETE REINFORCEMENT

A. This section covers all concrete reinforcement and its accessories.

B. The latest editions of the following specifications and codes shall govern.

1. ACI 301, Specifications for Structural Concrete for Buildings.

2. ASTM A615

3. ASTM A185

PART 2 - PRODUCTS

A. Reinforcing steel shall comply with ASTM A615, intermediate grade 40, unless otherwise shown.

B. Reinforcing mesh shall comply with STM A185 and shall be gauge and mesh indicated.

PART 3 - EXECUTION

A. Reinforcement bars and mesh shall conform to the sizes and spacings as shown.

B. Field bending and cutting will be permitted if performed in accordance with above listed code.

C. Reinforcement shall be free from dirt, oil, paint, grease, mill scale, and loose or thick rust when concrete is placed.

D. Woven wire mesh shall be hooked and/or supported during the placement of concrete slabs to ensure proper embedment as detailed.

E. Anchorage and accessories shall be accurately placed as shown and held rigidly in position during placing of concrete.

F. Depth of cover, radius of bends, and deformations shall be in accordance with ACI 318.

SECTION 03300

CAST-IN-PLACE CONCRETE

A. This section covers cast-in-place concrete, including curing and finishing of concrete.

B. The latest editions of the following specifications and recommended practices shall govern:

1. ACI 301 - Specifications for Structural Concrete for Buildings.

2. ACI 306 - Recommended Practice for Winter Concrete

3. ACI 305 - Recommended Practice for Hot Weather Concrete

C. Notify C.O. 48 hours prior to placing concrete.

PART 2 - PRODUCTS

A. Concrete Mix Design

1. The concrete shall be a “pump” mix having a minimum "compressive strength" of 3000 psi at 28 days.

2. Concrete coloring shall be as manufactured by Davis Colors, color # 8084 Graphite.

3. Concrete shall be air-entrained and shall contain not less than 3% and not more than 6% entrained air determined by test procedure AASHTO T 152.

4. “Commercial” Fibermesh Reinforcement shall be required.

5. The design of the concrete mixture shall be the responsibility of the Contractor.

B. Slump shall not exceed 3 inches for vibrated concrete or 5 inches for non-vibrated concrete.

PART 3 - EXECUTION

A. "Ready-Mixed Concrete" may be employed if the time interval between mixing at the plant and discharge into the form does not exceed 1-1/2 hours.

B. All concrete shall be placed within 1-1/2 hours from the time of mixing.

1. No concrete shall be placed after it has started its initial set.

2. No concrete with a temperature above 90ºF shall be placed.

C. Concrete shall be placed in such a manner as to avoid segregation of the mixture.

1. Concrete shall be spread in horizontal layers when practicable.

2. No concrete shall be freely dropped more than 5 feet.

3. Depositing a large quantity of concrete and flowing or working it along the forms will not be permitted.

D. Mechanical vibrators shall be used for consolidation of concrete.

1. Concrete shall be consolidated within 15 minutes after placement.

2. If consolidation of concrete with mechanical vibrators is impractical, hand tamping, rodding, and spading will be permitted.

3. A minimum of two vibrators, in working order, shall be on the job during concrete placement.

E. Concrete shall be placed and protected as specified for temperature conditions.

F. Concrete plant standards and truck mixer and agitator standards shall be as recommended by the

National Ready Mix Association.

G. Finishing

1. All finishes shall be made without use of cement or other dusting materials.

2. Concrete shall be struck to proper grade and surface finished with float trowels.

3. At all exposed form surfaces, remove all ties, fill all form tie holes and imperfections (i.e., "honeycombing") with dry cement mortar, remove all lines, and then "sack" or finish to match adjacent surfaces.

4. Exterior sidewalks shall be heavy broom finished.

H. Concrete shall be protected against rapid drying and kept moist for seven days by covering with curing paper with edges sealed.

I. Sampling and Testing

1. Sampling and testing shall be the responsibility of the Contractor, through an approved testing laboratory. The Contractor shall test for strength, air content and slump.

2. Sampling and testing shall be done in accordance with the following test methods:

--Sampling Fresh Concrete................................... AASHTO T-141 --Making and Curing Concrete Compression Test Specimens........................... AASHTO T-23 --Compressive Strength of Concrete Cylinders…. AASHTO T-22 --Percent Entrained Air (Pressure Method)........... AASHTO T-152 --Consistency (Slump) of Concrete....................... AASHTO T-119

3. Testing frequency shall be one sample or test per every 10 c.y. or truck load.

4. Submit copy of test results to Contracting Officer.

SECTION 03310

CONCRETE FROM PACKAGED DRY MIX FOR MINOR STRUCTURES

A. Consists of constructing small concrete structures requiring one-half cubic yard or less in accordance with the details shown on the drawings and in conformance with the requirements of this specification.

PART 2 - PRODUCTS

A. Forms: Plywood, hardboard, wood, metal or other approved material to yield the required finish.

B. Dry Mix: The prebagged concrete mix shall be made using a dry preportioned blended mix meeting the requirements of ASTM C-387 for 28 days, 3,500 psi concrete.

C. Water: Water shall be clean and free from alkali and other deleterious materials. Water shall be added to each bag as recommended by the manufacturer.

D. Welded Wire Fabric: AASHTO M-32 and M-55.

PART 3 - EXECUTION

A. Job Mixing: The dry concrete mix and water shall be thoroughly mixed as recommended by the manufacturer. Mixing must be done in either a mechanical mixer or in a wheelbarrow. Concrete shall be mixed and placed while fresh. Any concrete in which initial set has begun shall be wasted. In any case, the elapsed time from placement of the first batch to placement of the last batch necessary to complete a specific concrete item shall not exceed one hour.

B. Placing and Finishing: The fresh concrete shall be placed in the forms and rodded as necessary to remove the air pockets. The exposed surfaces of the concrete shall receive a medium trowel finish.

C. Protection from Cold: The Contractor shall ensure that the air surrounding the fresh concrete be kept at a temperature above 50 degrees F for a period of five days after the concrete is placed.

D. Curing: If determined necessary by the C.O., exposed surfaces shall be covered with plastic sheeting after the concrete has taken its initial set.

SECTION 05500

METAL FABRICATIONS

A. Work in this item includes all structural and miscellaneous metal and other related items.

PART 2 - PRODUCTS

A. Steel member, steel angles and other miscellaneous steel shall conform to ASTM A-36, to the sizes and layout shown on the drawings.

B. Steel primer shall be alkyd, DevGuard 4100 by Devoe Coatings.

C. Steel finish coats shall be Acrylic, Semi Gloss Enamel, DeveFlex 4206 Gray color by Devoe Coatings.

PART 3 - EXECUTION

A. The Contractor shall provide all framing and falsework necessary for the erection.

B. At final attachment, all miscellaneous metal and other items shall be rigid and secure.

C. After erection, touch up field connections and abraded places on all steel with shop paint.

D. Field apply two finish coats to all steel structures..

SECTION 06100

CARPENTRY

A. This section includes carpentry work for the construction of the observation deck.

PART 2 - PRODUCTS

A. All framing material shall be treated #1 southern yellow pine. Treatment shal be 0.60 ACA or CCA.

B. Rough Hardware - Furnish all items of rough hardware required to complete the work. Nails, Bolts, nuts, and washers shall be hot-dipped galvanized, conforming to ASTM A153.

D. Decking material shall be 2x6 “Trex” Accents, Winchester Gray Color.

1. Decking screws shall be 3” long, “Trap Ease” by Fastenmaster, gray color.

A. Framing shall be neat with square cuts and to the layout and elevations shown on the drawings.

B. Install “Trex” decking per manufactuer’s recommendations

1. Width-to-Width and end-to-end gapping shall be ¼”.

2. Maximum overhang is 4 inches perpendicular.

3. Install two screws per connection.

SECTION 07110

MEMBRANE WATERPROOFING

A. This section covers all membrane waterproofing and related items.

PART 2 - PRODUCTS

A. Vapor barrier shall be 6 mil, clear grade polyethylene.

A. Install vapor barrier under all concrete walkways. Lap and secure edges of vapor barrier to assure tight seal.

SECTION 09900

PAINTING

A. This section includes all paint and related items.

B. Quality Assurance

1. All paints, enamels, varnishes, and stains shall be furnished in original, unopened containers bearing a label to include the manufacturer's name, type of paint or stain, manufacturer's stock number, color, and instructions for application.

C. Delivery, Storage, and Handling

1. All materials required for painting, varnishing, and staining shall be delivered to the job site in original containers with labels intact and seals unbroken.

2. Store in a suitable location and comply with health and safety regulations.

3. All oily rags, waste, etc., and all flammable cleaning compounds shall be removed from the building every night to avoid fires.

4. Upon completion of work, all surplus material and debris from the paint work shall be removed from the job site.

D. Environmental Requirements

1. Comply with the manufacturer's recommendations as to environmental conditions under which coating and coating system can be applied.

2. Do not apply paint in areas where dust is being generated.

E. Protection

1. Cover or otherwise protect finished work of other trades and surfaces not being painted.

PART 2 - PRODUCTS

A. See Section 05500

1. Submit sample charts for all specified paints.

B. Mixing

1. Apply paint of consistency recommended by manufacturer. Additional thinning not permitted

A. Preparation of Surfaces

1. Prepare surfaces as necessary to receive painting as specified. Retouch shop coats and prime coats as necessary.

2. Fill and sand as necessary to provide a suitable surface for painting.

3. Clean surfaces to be painted. Spaces in which painting will be done shall be broom-cleaned and dust-free.

4. Remove soil, prints, stains, and adhered materials prior to beginning of work.

5. Meet requirements of other portions of Specifications for preparation of specific items.

B. Application

1. No exterior painting shall be done in rainy, damp, or frosty weather or until the surface is thoroughly dry.

2. No paint shall be applied when the temperature is below 40 degrees, or when the temperature is likely to be reached within 48 hours.

3. All paint shall be applied in accordance with the manufacturer's recommendations unless otherwise directed.

4. All coats shall be thoroughly dried before applying succeeding coats with sanding between coats where necessary. Comply with manufacturer's recommendation for drying time between succeeding coats.

5. Finish coats shall be smooth, free of brush marks, streaks, laps, or pole of paints, and skipped or missed areas. Finished metal surfaces shall be free of skips, voids or pinholes in any coat.

6. Leave all parts of moldings clean and true to details with no undue amount of paint in corners and depressions.

7. Apply paint, enamel, and varnish with suitable brushes. The rate of applications shall not exceed that as recommended by the paint manufacturers for the surface involved.

8. Make edges of paint adjoining other materials or colors stain and sharp with no overlapping.

C. Cleaning

1. Touch up and restore finish where damaged.

2. Remove spilled, splashed, or splattered paint from all surfaces.

3. Do not mar surface finish of item being cleaned.