Attachment 1 - Specifications.pdf

NATIONAL FORESTS IN NORTH CAROLINA

NANTAHALA RANGER DISTRICT

WAYAH BALD RECREATION AREA

OBSERVATION TOWER REPAIRS

ARRA PROJECT # CIM - 0811 - 62F

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

02210 - Site Grading 02200 - Selective Building Demolition 02220 - Structural Excavation 02250 - Compaction Control and Testing 02540 – Erosion and Sedimentation Control 02821 – Seeding 02822 – Chain-Link Fences and Gates

DIVISION 3 - CONCRETE

03100 - Concrete Formwork 03130 - Resurfacing of Cast-in-Place Concrete 03200 - Concrete Reinforcement 03300 - Cast-in-Place Concrete

DIVISION 4 - MASONRY

04014 - Stone Masonry Restoration

DIVISION 6 - WOOD AND PLASTICS

06100 – Carpentry

DIVISION 7 - THERMAL AND MOISTURE

07110 - Membrane Waterproofing

DIVISION 1 - GENERAL REQUIREMENTS

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

SECTION 01010

SUMMARY OF WORK

PART 1 - GENERAL

A. The Contractor is to provide the complete reconstruction of the observation tower stairway and related 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, Crystall Powell 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.

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.

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 no potable water at the site. The Contractor must furnish potable water for the project as needed.

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. There is a bench mark with an assumed elevation of 100 feet for vertical control.

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.

2. Epoxy concrete grout.

3. Imported rock samples to match existing rock veneer.

4. Chain-link fencing materials including specific details on fabric gauge, posts dimensions etc.

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

DIVISION 2 - SITE WORK

02210 - Site Grading 02200 - Selective Building Demolition 02220 - Structural Excavation 02250 - Compaction Control and Testing 02540 – Erosion and Sedimentation Control 02821 – Seeding 02822 – Chain-Link Fence and Gate

SECTION 02210

SITE GRADING

A. This section covers all required site grading, rock pavers removal and reinstallation, and the final dressing of the site within the construction area.

PART 2 - PRODUCTS

A. Bedding material under re-installed concrete pavers shall be coarse sand.

PART 3 - EQUIPMENT

A. The Contractor must utilize a narrow rubber track backhoe in order to minimize damage to the existing asphalt trail.

PART 4 - EXECUTION

A. Excavation shall produce surfaces to line and grade shown on drawings.

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

C. Compact bedding material under all surfaces.

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

D. 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.

SECTION 02200

SELECTIVE BUILDING DEMOLITION

PART 1 – GENERAL

Work included in this section covers the removal of the existing rock stairway, tower cab floor surfacing and roof posts.

PART 2 – PRODUCTS

A. Construction grade 2x lumber and 4x4 posts.

PART 3 – EXECUTION

A. Prior to removal, photograph and inventory all rockwork to be removed and re-used.

1. Do not mix rocks from different walls. Store rocks from separate walls away from each other. Do not set rocks on the ground. Provide wooden pallets to set the rock on.

2. Clearly label all “larger” rocks and reference their original location on the wall.

B. Protect adjacent materials and finishes prior to removing stairway.

C. Provide all necessary false work for the removal of the of the existing roof posts.

1. Raising of the Roof Structure shall be done is a “safe” manner. The raised roof shall be stable and shall resist all wind conditions that may be encountered after the posts are removed.

2. Repair any damage to the roof structure that may occur during or after raising and re-installing operation.

D. Saw cut the existing concrete floor as needed to accommodate the installation of the floor drain.

E. Dispose of all refuse at a State Approved facility.

SECTION 02220

STRUCTURAL EXCAVATION

A. This section consists of the necessary excavation for the installation of the retaining wall footings.

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. Foundation pits 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 backfills shall be as as shown on the drawings.

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 and footings shall be compacted to a uniform density until no visible settlement occurs.

C. Backfill around structures and supports shall be done in 12" 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 02540

EROSION AND SEDIMENTATION CONTROL

A. This work consists of temporary and permanent measures as directed by the COR 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. 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.

B. 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.

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

SECTION 02821

SEEDING, FERTILIZING, AND MULCHING

PART 1 GENERAL

A. This section covers the seeding of all disturbed areas within the construction limits. The work shall include fine grading of the areas, soil preparation, and application of lime, fertilizer, seed, and mulch.

PART 2 PRODUCTS

A. Fertilizers shall be spread on the ground surface at the following rates.

Grade 18/46/0 600 lb/acre

B. Seed shall be spread on the ground surface in the following amounts.

Winter 90 lbs/acre

C. All dates shown are guidelines. If weather conditions are abnormal, the CO shall consult with Forest

Service Soil Scientist and/or Botanist for additional seeding times.

Permanent Seeding – Spring (2/1 to 5/1):

Fungus Free Tall Fescue (Kentucky 31 is not acceptable): 20 lbs/acre Virginia Wild Rye: 10 lbs/acre Creeping Red Fescue: 6 lbs/acre Red Clover: 12 lbs/acre Rye (cereal small grain): 30 lbs/acre

Permanent Seeding – Summer (5/1 to 8/1):

Creeping Red Fescue: 10 lbs/acre Little Bluestem: 10 lbs/acre Indian Grass: 10 lbs/acre Partridge Pea: 6 lbs/acre

Temporary Seeding:

Foxtail (German) Millet: 30 lbs/acre Partridge Pea: 5 lbs/acre

D. Assure that mulch used on the project is certified noxious weed free by the appropriate authority in the jurisdiction of use.

E. Moisten seeding areas before seeding and maintain the moisture until 3 days after germination.

F. Apply fertilizer by the following methods:

1. Dry method. Incorporate the fertilizer into the upper portion of the seedbed before seeding.

2. Apply seed and fertilizer at rates specified.

3. Apply seed by the following methods:

a. Dry method. Apply the seed with approved power driven seeders, drills, or other mechanical equipment. Hand-operated seeding methods are satisfactory on areas inaccessible to mechanical equipment.

4. Apply mulch within 48 hours after seeding by the following methods:

a. Dry method. Spread all mulch material, except wood and grass cellulose fibers, by a mulch spreader utilizing forced air to blow the mulch material onto the seeded area.

Apply straw mulch at designated rate. Anchor the mulch material with an approved stabilizing emulsion tackifier or approved mechanical method. Do not mark or deface structures, pavements, utilities, or plant growth with tackifier. Apply wood fiber or grass straw cellulose fiber mulch at the designated rate. Apply bonded fiber matrix hydraulic mulch at the designated minimum rate. Apply so no hole in the matrix is greater than

0.04 inches. Apply so that no gaps exist between the matrix and the soil.

b. Mulch by hand areas inaccessible to mulching equipment.

5. Protect and care for seeded areas including watering when needed until final acceptance.

Repair all damage to seeded areas by reseeding, refertilizing, and remulching. Apply supplemental applications of seed, mulch, fertilizer, lime, or ammonium nitrate.

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

B. All disturbed areas to be seeded shall be graded, leveled, and prepared to receive the grass seed.

C. Application of Lime and Fertilizer - following the grading and leveling operation, lime and fertilizer shall be spread uniformly over the area to be seeded.

D. Seed shall be uniformly sown over the area at the rate specified by hand sowing. The Contractor may use a hydro-seeding method if approved by the COR.

E. Pine straw or hay shall be uniformly spread over the area at the rate specified.

SECTION 02822

CHAIN - LINK FENCES AND GATES

1.01 WORK INCLUDED

A. Fence framework, fabric and accessories.

B. Gates and related hardware

C. Installation

1.02 SCOPE OF WORK

A. Summary: This section covers the work necessary to complete the chain link fence and gate installation.

B. Delivery, Storage, and Handling: deliver material to the site in an undamaged condition. Carefully store material off the ground to provide proper protection against oxidation caused by ground moisture.

1.03 SUBMITTALS, CERTIFICATION, GUARANTEE AND INSPECTION

A. Shop Drawings: Include complete details of fence and gate construction, fence height, post spacing, dimensions, unit weights of framework and footing details.

B. Product Data: Provide manufacturer’s catalog cutes with printed specifications. Manufacturer shall provide certification of compliance with material specifications.

2.01 MATERIAL

A. Pipe shall be straight, true to section and conform to the following weights:

Pipe Size O.D. Weight lbs/ft.

1 - 7/8” 2.01 2 - 3/8” 2.78

C. Fabric:

1. Aluminized fabric shall be manufactured in accordance with ASTM A 491 and coated before weaving with a minimim of 0.4 ounces of aluminum per square foot of surface area. The steel wire shall conform to ASTM A817. Fabirc to be 9 gauge woven in a 2” diamond mesh. Top and bottom selvage to be knuckled unless otherwise specified.

OR

2. Zinc-coated fabric shall be galvanized after weaving with a minimum 1.2 ounces of zinc per square foot of surface area and conform to ASTM A 392, Class 1. Fabric to be 9 gauge wire woven in a 2” diamond mesh. Top selvage and bottom selvage to be knuckled unless otherwise specified.

2.02 COMPONENTS

A. Fence Posts:

Fabric Line Post Terminal Post Height O.D. O.D.

6 ft.

1-7/8” 2-3/8”

B. Swing Gate Posts:

Width Post O.D.

Double Gate

12’

2-7/8”

C. Rails and Braces: 1-5/8” O.D. Group IA or IV

D. Gates: Per ASTM F900 with frame assembly of 1-7/8” O.D. Pipe Group IA or IV with welded joints. Weld areas are repaired with zinc-rich coating applied per manufacturer’s direction. Fabric is to match fence.

Gate accessories, hinges, latches, center stops, keepers an necessary hardware of qulaity required for industrial and commercial application. Latches shall permit padlocking. Vinyl coated system to have pressed steel corner fittings securely rivited to the frame.

E. Fittings: All fittings conform to ASTM F 626

Post Caps – Pressed steel, cast iron or aluminum alloy designed to fit snugly over posts to exclude moisture. Supply dome style caps for terminal posts and loop type for line post.

Rail Brace Ends – Pressed steel, cast iron or cast aluminum alloy, cup-shaped to receive rail and brace ends.

Top Rail Sleeves – Tubular steel, 0.051 thickness x 6” long, expansion type.

Tension Bars – Pressed steel, 14 gauge thickness x ¾ “ wide.

Brace Bands – Pressed steel, 12 gauge thickness x ¾ “ wide.

Truss Rods – Steel rod, 5/16” diameter merchant quality with turnbuckle (take up).

Barbed Wire-Arms – Pressed steel, cast iron or cast aluminum alloy fitted with clips or slots for attaching three strands of barbed wire. Arms shall be set outward on a 45-degree angle and be capable of supporting a 250-pound load at outer barbed wire connecting point without causing permanent deflection.

F. Tension Wire – Marcelled 7 gauge steel wire, galvanized or aluminized per ASTM A 817 and A 824.

G. Tie Wires: As per ASTM F 626 Aluminum, 9 gauge, alloy 1100-H4 or equal.

H. Hog Rings: Steel wire, 12 gauge, with a minimum zinc coating of 0.80 ounces per square foot of wire surface or 9 gauge aluminum per ASTM F 626.

I. Barbed Wire: Commercial quality steel, 12-1/2 gauge, two strand twisted line wire with 4 point barbs at 5 inch spacing. Coating shall consist of a minimum of 0.80 ounces of zinc per square foot of wire surface conforming to ASTM A 121 or a minimum of 0.30 ounces of aluminum per square foot of wire surface conforming to ASTM A 585.

3.01 INSTALLATION

A. General: installation to conform to ASTM F567.

B. Height; Provide height as indicated on contract drawings.

C. Post Spacings: Space line posts at intervals not exceeding ten feet or as shown on plans.

D. Post Settings: Set terminal, gate and line posts plumb. Depth to be a minimum of 36”. Backfill post holes with excavated material and hand tamp.

E. Bracing: Brace gate and terminal posts back to adjacent posts with 1-5/8” O.D. horizonal brace rails and

5/16” O.D. galvanized, diagonal, adjustable truss rods.

F. Top Rail: Install through line loop caps connecting sections with sleeves to form a continuous rail between terminal posts. No section to be longer than 21’.

G. Bottom and Mid Rails: Not required.

H. Bottom Tension Wire: if required stretch between terminal posts 6” above grade and fasten to outside of line posts with wire ties.

I. Fabric: Pull fabric taut with bottom selvage 2” above grade. Fasten to terminal posts with tension bars threaded through mesh and secured with tension bands at maximum 15” intervals. Tie to line posts and top rails with tie wires spaced at maximum 12” on posts and 24” on rails. Attach to bottom tension wire with hog rings at maximum 24” intervals.

J. Barbed Wire: Anchor to terminal extension arms, pull taut, and firmly install in slots of line post extension arms. Barbed ratchets or brace bands to be used on end posts.

K. Gates: Install gate plumb, level and secure or full opening with out interference. Anchor center stops and hold open keepers in concrete. Gates to be capable of 90 degree swing.

L. Fasteners: Install nuts for fittings, bands, and hardware bolts on inside of fence.

DIVISION 3 - CONCRETE

03100 - Concrete Formwork 03130 - Resurfacing of Cast-in-Place Concrete 03200 - Concrete Reinforcement 03300 - Cast-in-Place Concrete

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.

SECTION 03130

RESURFACING OF CAST-IN-PLACE CONCRETE

PART I GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the contract, including General and Supplementary Conditions, apply to this section.

1.2 SUMMARY

A. This section specifies material for self-leveling topping, resurfacer, and underlayment that can be used indoor/outdoor, can accept traffic in 2 hours, and can be coated in 12 hours.

1.3 SUBMITTALS

A. Submit 2 copies of product manufacturer’s literature and Material Safety Data Sheets (MSDS). Visit www.ctscement.com for the latest online version Rev. 090301 PRODUCT SPECIFICATION TRU™ Self Leveling

1.4 QUALITY ASSURANCE

A. References: Comply with the following unless modified by this specification.

1. ASTM C109/C109M-02 Standard Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. Cube Specimens)

2. ASTM C191-04 Standard Test Method for Time of Setting of Hydraulic Cement by Vicat Needle

3. ASTM C882-99 Standard Test Method for Bond Strength of Epoxy-Resin Systems Used With Concrete By Slant Shear

4. ASTM C928-00 Standard Specification for Packaged, Dry, Rapid-Hardening Cementitious Materials for Concrete Repairs

5. ASTM C1107-99 Standard Specification for Packaged Dry, Hydraulic-Cement Grout (Nonshrink)

1.5 DELIVERY, STORAGE, AND HANDLING

A. Delivery: Deliver materials to jobsite in original, unopened, undamaged containers that clearly show the manufacturer’s name, product name, and batch number.

B. Storage: Store material in a dry area off the ground protected from rain, snow, and other sources of moisture.

Protect material from temperature extremes.

PART 2 PRODUCTS

2.1 SELF-LEVELING MATERIAL

A. Shall be manufactured by CTS Cement Manufacturing Corp., 11065 Knott Avenue, Suite A, Cypress, CA, 90630. Phone: 800-929-3030 Website: www.ctscement.com

B. Rapid Set® TRU™ Self-Leveling: One component, crack resistant, cement based, self-leveling material for topping, resurfacing, and underlayment that can be used indoor/outdoor, can accept traffic in 2 hours, and can be coated in 12 hours. Visit www.ctscement.com for the latest online version Rev. 090301 PRODUCT SPECIFICATION TRU™ Self Leveling

1. Set time per ASTM C191 (Mod.) at F: Initial set 15 minutes. Final set 35 minutes.70

2. Compressive strength per ASTM C109 (Mod.): 2 hours 1500 psi 4 hours 3500 psi 24 hours 6500 psi 28 days 7500 psi

3. Slant shear strength per ASTM C882 (Mod.): 1 day 1400 psi 28 days 2600 psi

4. Shall meet ASTM C928 for packaged concrete repair materials.

5. Shall be non-metallic with no added chlorides and shall be pre-blended requiring only the additon of water.

C. Rapid Set® Concrete Pharmacy®: Add these small, pre-measured packets to the repair material per manufacturer’s recommendations to change the properties as shown.

1. SET Control® — slows down the set time

2. Fast — speeds up the set time

3. Dark — darkens the color of the repair material (match stairway non-colored concrete)

2.2 WATER: POTABLE.

PART 3 EXECUTION

3.1 SURFACE PREPARATION

A. Mechanically remove loose, unsound, contaminated concrete.

B. The aggregate fractured surface shall have a minimum profile of 1/16 inch. Visit www.ctscement.com for the latest online version Rev. 090301 PRODUCT SPECIFICATION TRU™ Self Leveling

C. Concrete must be free of materials such as paint, oil, curing compound, bond breaker, etc. that will inhibit bonding.

D. Thoroughly clean extraneous material such as dirt, loose chips, and dust from concrete surface. If compressed air is used, it shall be free of oil.

E. Apply a good quality primer per manufacturer’s recommendations.

3.2 MIXING

A. Use 5 quarts of water per 50-pound bag of repair material.

B. Warmer material will setMixed material should have a temperature of about 70 faster than expected and cooler material will have slower strength gain. Control the mixed temperature by protecting the bags of repair material from temperature extremes and adjust the mixed temperature by using hot or cold water.

C. Add potable water first then add Concrete Pharmacy packets if necessary then add repair material while mixing mechanically in a mortar mixer or with a drill and mixing paddle.

D. Do not add any other admixtures. Do not add sand, aggregate, or cement.

E. Mix for 3 to 5 minutes with a shear type mixer to achieve a uniform, lump-free consistency. Avoid mixers that entrap large amounts or air.

F. Do not re-temper.

3.3 PLACEMENT

A. Pour or pump the material with a minimum thickness of 1" onto the prepared and primed substrate.

B. Use a spreader or gauge rake to level the material.

C. Use a smoother or other tools to coax the material into place as required.

D. Use a porcupine roller to minimize air bubbles.

E. For thicknesses greater than 1", extend each 50-pound bag of material with 25 pounds of clean 3/8" pea gravel.

Place the extended material to ¾ " below desired floor level and then place neat material for the final ¾ “ within 24 hours.

F. Place material only if surface and ambient temperatures are above 45F and rising.

G. Protect adjacent surfaces with drop cloths, waterproof paper, or other means to maintain them free of material splashes, water, and debris.

H. Place material immediately after mixing. I.Apply sealer, if specified, 12 hours or more after self-leveling material hardens per sealer manufacturer’s recommendations.

3.4 CURING

A. No curing required under normal conditions. However, if used in excessively dry, windy, hot, or sunny conditions, apply water mist to the surface as soon as it can be done without marring the surface and continue until 1 hour after initial set.

3.5CLEAN UP

A. Do not allow buildup of hardened repair material in the mixer, since this creates inefficient mixing and the heat generated accelerates later batches.

B. Clean all tools immediately after use.

C. Clean excess material from surrounding areas immediately.

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.

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

E. 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

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

K. 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.

L. “Commercial” Fibermesh Reinforcement shall be required for steps and landings.

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 landings and steps 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.

DIVISION 4 - MASONRY

04140 – Stone Masonry Restoration

SECTION 04140

STONE MASONRY RESTORATION

1.01 SUMMARY

A. Section Includes: Restoration and repointing of stone veneer on tower structure and safety wall.

1.02 REFERENCES

A. Publications listed herein are part of this specification to extent referenced.

B. Preservation Brief #2: Repointing Mortar Joints in Historic Masonry Buildings, Technical Preservation

Services, National Park Service, Washington, DC 1998.

C. American Society for Testing and Materials:

1. ASTM C144 Specification for Sand

2. ASTM C150 Specification for Portland Cement

3. ASTM C270 Specification for Mortar

1.03 QUALITY ASSURANCE

A. Historic Significance: The Wayah Bald Tower is a National Historic Landmark. Care will be taken to protect existing stonework from further damage during the work of this project. All work will be undertaken to protect, retain and preserve as much original material as possible.

B. Qualifications: Masons will be trained or qualified in installation techniques and procedures of restoration of historic masonry and will demonstrate a minimum of 5 years successful experience in such work. Submit qualifications for approval by the Contracting Officer. Contractor will submit qualifications to Contracting Officer. Contracting Officer reserves right to reject masonry restoration technicians not meeting qualifications.

C. Field Samples:

1. Masonry repointing samples will be prepared to demonstrate quality of materials and workmanship for stonework repointing. Test panel(s) will include mortar joints within an area approximately (3) feet in width by (3) feet in height minimum, and will be installed on existing walls as approved by

Contracting Officer. Adjust color and finish of repair mortar as directed by Contracting Officer.

2. Accepted panels, materials, and procedures will become standard for quality control of masonry restoration work and will be left in place until all masonry work is complete. Accepted panels may be incorporated into Work where appropriate.

3. Additional panels will be prepared at no additional cost to Government until quality of masonry restoration is acceptable to Contracting Officer.

D. Pre-Installation Conference:

1. Contractor shall schedule a conference and inspection to be held at prior to start of restoration work. Conference and inspection shall serve to clarify Contract Documents and restoration requirements.

2. Conference shall be attended by General Contractor, Masonry Subcontractor and Contracting

Officer.

3. Topics to be discussed at meeting will include:

a) Inspection of existing stonework.

b) A review of Contract Documents and accepted submittals shall be made and deviations or differences shall be resolved.

c) Review items such as application procedures and sequences. If conflicts exist between what is considered good practice and Contract Documents, these differences shall be defined and documented.

d) Review specific problem areas that are to receive special restoration techniques.

e) Establish which areas on Site will be available for use as storage areas and working area.

1.04 SUBMITTALS

A. Samples: Submit stone masonry materials proposed for use in patching or replacing existing masonry.

For each application, provide a minimum of five (5) stones representing full range of color and texture to be expected in completed work.

B. Quality Assurance Submittals:

1. Certificates: Provide notarized certification that technicians utilized for masonry restoration work meet specified qualifications.

2. Submit listing of not less than three (3) most recent restoration installations representing similar scope and complexity to Project requirements. List will include information as follows:

a) Project name and address

b) Name of owner

c) Name of contractor

d) Name of architect

e) Date of completion

3. Manufacturer's Instructions: For custom manufactured mortar, submit manufacturer's installation procedures that will be basis for accepting or rejecting actual installation procedures.

1.05 DELIVERY, STORAGE, AND HANDLING

A. Packing, Shipping, Handling, and Unloading: Deliver materials in manufacturer's original unopened packaging with labels intact.

B. Storage and Protection:

1. Store materials in a clean area, away from construction activities.

2. Stack materials to prevent water from accumulating on or within materials, using blocking or skids to provide drainage.

3. Cover materials with tarpaulins or plastic in a manner to provide air circulation and to prevent damage to surfaces.

4. Protect sand from contamination from dirt or other foreign materials.

5. Remove damaged materials from Site.

6. Upon use, date and retain all packages for quality control check.

1.06 PROJECT CONDITIONS

A. Environmental Conditions:

1. Masonry surfaces will be repaired or pointed only when air and surface temperatures are above 45°

F and are expected to remain so until masonry has dried out, but for not less than 48 hours after completion of restoration.

2. Protect mortar from rapid drying by keeping work damp for no less than 48 hours following placement. When temperatures are in excess of 80° F, extend curing period to 72 hours.

B. Cold Weather Precautions:

1. Comply with following recommendations for cold weather conditions:

2. Maintain mortar temperature between 40°F (4°C) and 120°F (49°C). Maintain mixing temperatures within ±10°F (6°C) of first batch.

3. To assure proper mortar temperatures, heat mixing water or aggregates when air temperature is between 32°F (0°C) and 40°F (4°C). When air temperature is between 25°F (-4°C) and 32°F (0°C), heat both water and aggregates.

4. When air temperature is below 20°F (-7°C), do not install masonry.

5. Do not heat water or sand above 160°F (71°C). Do not scorch sand.

2.01 MASONRY MATERIALS:

A. Salvaged Stone: Existing stone, cleaned and salvaged from this project.

1. Handle and store stone so as not to fracture individual units.

2. Remove existing mortar from surface.

3. Reuse only stone in good condition as approved by Contracting Officer.

B. Replacement Stone:

1. Match existing stone in type, hardness, weatherability, density, color, cut and range of size.

2. If necessary, provide certification from a professional geologist that the new stone is a match of the existing stone to be replaced.

2.02 MORTAR

A. Cementitious Materials:

1. Portland Cement: ASTM C150, Type I, white.

2. Lime: Hydrated lime; standard manufacture; ASTM C207, Type S

3. Lime Putty: ASTM C5

4. Custom pre-blended lime mortars are permitted as approved by Contracting Officer.

5. Pre-blended masonry cements are not permitted.

B. Aggregate: Sand: ASTM C144, clean, washed and free from impurities.

1. Size and Gradation: 30% void ratio by volume. Match sand(s) in existing mortars as approved by

Contracting Officer.

2. Color: Match sand(s) in existing mortars as approved by Contracting Officer. Final mortar color may be affected by aggregate color. Select sand(s) to match existing sand(s) as much as possible.

C. Admixtures:

1. No air-entraining admixtures or materials containing air-entraining mixtures will be used in mortar.

2. No antifreeze compounds or other substances will be added to mortar.

3. Calcium chloride or admixtures containing chloride ions are not permitted.

2.01 MORTAR MIXES

A. Final mortar mix designs to be determined after inspection by Contracting Officer. Bedding mortar to match repointing mortar.

B. Mortar for Stone Veneers - proportions by volume (equal to ASTM Type O):

1. Cement: 1 part

2. Lime: 2 parts

3. Sand: 7-9 parts

3.01 PREPARATION

A. Inspection: Inspect existing rock veneers with Contracting Officer to confirm extent of repointing and rebuilding work.

B. Protection: Protect adjacent surfaces from mortar droppings.

C. Stone Removal and Storage:

1. Salvage removed stone, including partial or broken units. Salvage as many whole, undamaged stones as possible.

2. Clean surfaces to remove mortar, dirt, paint, and other substances that could affect bonding during reinstallation.

3. Store stone on pallets, off of ground.

4. Do not mix stones from different walks.

D. Joint Raking:

1. Remove existing mortar to a minimum depth of (2) times the width of the joint back from the finished face of the mortar joint.

2. If using saws or grinders, make only one pass through center of each joint. Rake out remainder of mortar in joints by hand chisel and mallet. Do not chip, cur, or spall face of stone, or widen joints.

3. Remove mortar from masonry surfaces within raked-out joints to provide reveals with square backs and to expose masonry for contract with pointing mortar.

4. Remove loose materials with a brush and air pressure.

5. Joint raking operations resulting in damage to masonry will cease immediately until tools, workmen, and methodology can be reviewed and corrective measures taken to acceptance of Contracting

Officer. Masonry damaged as a result of joint raking procedures will be repaired or replaced at no additional cost to Government.

3.02 INSTALLATION

A. Measuring and Mixing Mortar:

1. Measure the proportions and mix the mortar in accordance with ASTM C 270, unless otherwise directed. Use automatic measuring devices that will consistently maintain the specified proportion within a 5 percentage (plus or minus) tolerance.

2. Mix mortar in a mechanically operated drum-type batch mixer in which water can be accurately and uniformly controlled.

3. Mix all dry ingredients for at least two minutes, then add water and mix for at least three additional minutes. Do not exceed, in volume of mixed material, the manufacturer's rated capacity of mixer.

Empty the mixer completely after each batch. Keep mixer and all other equipment clean.

4. Using Mortar: Use mortar as soon as practicable after mixing. At air temperatures of 80º F and higher, use mortar within 2-1/2 hours of introduction of water to the mix. At lower temperatures, this time may be increased to 3-1/2 hours. Discard all mortar not used within these time limits. As an option to the above, if the initial set time of cements used are determined according to ASTM C

266, the time limit for use of mortar will be determined as follows: Initial set of cement minus one

(1) hour if air temperature is 80º F or higher, or initial set of cement minus one quarter (1/4) hour if air temperature is less than 80º F. Determine time limit for use of mortar from the cement with the shortest initial set time.

B. Pointing:

1. Wet joints thoroughly before pointing, allowing water to soak into surface to prevent free-standing water.

2. Fill joints solidly with pointing mortar. Mortar shall be placed into joints in approximately 1/4” layers and tightly compressed. When each layer is “thumbprint” hard, another 1/4” layer shall be placed into joint.

3. Exercise care to fully fill joints to proper depth, and finally tool joints at appropriate time to avoid tool burn or slicking. Tool and texture joints to match original appearance of joints. Remove excess mortar from edge of joint by brushing.

4. On hot, dry days pointing operations will be done in shade only.

5. Cure mortar by maintaining a damp condition for 72 hours. Hairline cracking within mortar or separation at edge of joint will be unacceptable. Work determined to be unacceptable will be replaced and re-inspected.

C. Masonry Rebuilding:

1. Masonry to be reconstructed as determined by Contracting Officer.

2. Masonry shall be saturated and surface damp, but not dripping when set.

3. Set stone in place on freshly placed mortar. Tooth all new work into existing, setting stones flush with adjacent stones.

3.03 Curing, Protecting, and Cleaning

A. Protect newly completed mortared masonry against frost and the elements, and cure with water moisture for a minimum of three (3) days.

B. Improperly cured or improperly protected masonry will be removed and suitably replaced by the

Contractor at his expense.

C. Place no loads on the masonry, nor any backfill behind it, until at least five (5) days have elapsed from masonry placement.

DIVISION 6 - WOOD AND PLASTICS

06100 – Carpentry

SECTION 06100

CARPENTRY

A. This section includes carpentry work for the replacemnet of the roof posts.

PART 2 - PRODUCTS

A. All material shall be treated southern yellow pine. Minimum 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.

1. Screws shall be 8 inches long “Timber Lok” Hex Drive screws.

A. Replacement posts and bracing shall match existing material with respect to size and diameter, notches and anchorage.

B. Secure posts and bracing to existing roof beam with specified hardware. All screws shall be countersunk.

C. Prime and paint existing drift pins prior to installing post.

D. Drill a pilot hole on posts prior to installation. Drilled hole shall be 1/8” in diameter smaller than the diameter of the existing pins.

DIVISION 7 - THERMAL AND MOISTURE

07110 - Membrane Waterproofing

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 landings and steps. Lap and secure edges of vapor barrier to assure tight seal.

PART 1 – GENERAL