Amend-0001_Section_07_72_00.10_28.pdf

McNary Levee Pumping Stations Hatches and Roofing W912EF-16-B-0004 Amend-0001

SECTION TABLE OF CONTENTS

DIVISION 07 - THERMAL AND MOISTURE PROTECTION

SECTION 07 72 00.10 28

ROOF HATCH MODIFICATIONS

PART 1 GENERAL

1.1 REFERENCES

1.2 SUBMITTALS

PART 2 PRODUCTS

2.1 STEEL DECKING

2.2 BOLTS

2.3 WELDED WIRE REINFORCEMENT

2.4 CONCRETE

2.5 ALUMINUM EXTRUSIONS

2.6 ALUMINUM SHEETS

2.7 EQUIPMENT ACCESS HATCH

2.7.1 Description

2.7.1.1 Equipment Access Hatch Submittal

2.7.1.2 Vented Curb

2.7.1.3 Louvers

2.7.1.4 Hatch Cover

2.7.2 Fabrication

2.8 ROOF SCUTTLE WITH GUARDRAIL

2.8.1 General

2.8.2 Roof Scuttle Submittal

2.8.3 Roof Scuttle Performance

2.8.4 Insulated Cover

2.8.5 Insulated Scuttle Curb

2.8.6 Lifting Mechanisms

2.8.7 Scuttle Hardware and Operation

2.8.8 Finish

2.8.9 5-yr Roof Scuttle Manufacturer Warranty

2.8.10 Acceptable Manufactured Product

PART 3 EXECUTION

3.1 REMOVAL OF ROOF VENTS AND ROOFING MATERIALS

3.2 CONCRETE REMOVAL

3.3 ROOF MOUNTED ANTENNAS

3.4 STRUCTURAL STEEL

3.5 STEEL DECKING

3.6 CONCRETE

3.6.1 Steel Reinforcements

3.6.2 Surface Preparation

3.6.3 Placing

3.6.4 Cold Weather Requirements

3.6.5 Hot Weather Requirements

3.6.6 Surface Finish

3.6.7 Curing and Protection

3.7 THERMAL & MOISTURE PROTECTION

3.7.1 Protection and Coordination Requirements

3.7.2 Roofing

SECTION 07 72 00.10 28 - Page 1 g4edddca Line g4edddca Line g4edddca Line g4edddca Line

3.8 ROOF SCUTTLE AND EQUIPMENT ACCESS HATCH INSTALLATION

3.9 PROTECTION

3.10 ROOF SCUTTLE PREVENTATIVE MAINTENANCE AND CARE INSTRUCTIONS

-- End of Section Table of Contents --

SECTION 07 72 00.10 28 - Page 2

SECTION 07 72 00.10 28

ROOF HATCH MODIFICATIONS

PART 1 GENERAL

Requirements under this SECTION apply to all Pumping Stations except for 12-1A, 12-2, 15-D.

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

ACI INTERNATIONAL (ACI)

ACI 318/318R (1999) Building Code Requirements for Structural Concrete and Commentary

ASTM INTERNATIONAL (ASTM)

ASTM A 611 (1997) Structural Steel (SS), Sheet, Carbon, Cold-Rolled

ASTM A1064/A1064M (2015) Standard Specification for Carbon-Steel Wire and Welded Wire Reinforcement, Plain and Deformed, for Concrete

ASTM B209 (2014) Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate

ASTM B221 (2014) Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes

ASTM C 171 (1997a) Sheet Materials for Curing Concrete

ASTM C 33 (2001a) Concrete Aggregates

ASTM C 494 (1999a) Chemical Admixtures for Concrete

ASTM C 94 (1996) Ready-Mixed Concrete

AMERICAN WELDING SOCIETY (AWS)

AWS D1.3 (1998) Structural Welding Code - Sheet Steel

ASTM INTERNATIONAL (ASTM)

ASTM A653/A653M (2013) Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by

SECTION 07 72 00.10 28 - Page 3 the Hot-Dip Process

CODE OF FEDERAL REGULATIONS (CFR)

29 CFR 1926 Safety and Health Regulations for Construction

MASTER PAINTERS INSTITUTE (MPI)

MPI 47 (2001) Interior Alkyd, Semi-Gloss

THE SOCIETY FOR PROTECTIVE COATINGS (SSPC)

SSPC Paint 25 (2000) Zinc Oxide, Alkyd, Linseed Oil Primer for Use Over Blast Cleaned Steel Type I and Type II

1.2 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals having an "I" designation are for information only. When used, a designation following the "G" or "I" designation identifies the office that will review the submittal for the Government. The following shall be submitted in accordance with Section 01 11 01.00 28 SUPPLEMENTARY

REQUIREMENTS:

SD-01 Preconstruction Submittals

Concrete Removal Plan; G, ST

SD-02 Shop Drawings

Equipment Access Hatch; G, EA

Roof Scuttle With Guardrail; G, EA

Steel Decking; G, ST

SD-06 Test Reports

Embedded Material Survey; G, ST

SD-11 Closeout Submittals

5-yr Roof Scuttle Manufacturer Warranty; G, EA

Roof Scuttle Preventative Maintenance and Care Instructions; I, EA

PART 2 PRODUCTS

2.1 STEEL DECKING

Steel decking shall be used as a permanent form for the concrete and shall comply with ASTM A653/A653M or ASTM A 611 . Decking shall be 1-1/2-inches deep, Type B. Units shall be fabricated of 16-gauge steel and shall be zinc coated in conformance with ASTM A653/A653M , G90 coating class. The Contractor shall submit shop drawings and ICBO Report for the steel decking.

The shop drawings shall show the layout of steel decking panels and details of supports and welding.

SECTION 07 72 00.10 28 - Page 4

2.2 BOLTS

See SECTION 05 50 00.10 28 MISCELLANEOUS METAL FABRICATIONS.

2.3 WELDED WIRE REINFORCEMENT

Welded wire reinforcement shall be ASTM A1064/A1064M Grade 60.

2.4 CONCRETE

Concrete shall consist of portland cement, aggregates, water, air-entraining admixture, and other optional admixtures, and shall conform to the material requirements of ASTM C 94 , Section 4, "Materials."

Portland cement shall be Type II, low alkali, meeting the requirements of ASTM C-150. General requirements for the mix shall be as listed in the following table:

Mix | Specified | Age | Max | ASTM C 33 | Slump | Air | ID | f'c 1 | | W/C | Grading No.| Range |Content | | | | Ratio | | | Range | Mix No.1 | 3000 psi |28 days| 0.50 | 67 | 1-4 inch | 5-7 % |

2.5 ALUMINUM EXTRUSIONS

Aluminum extrusions shall be alloy 6005, temper T5 in compliance with

ASTM B221.

2.6 ALUMINUM SHEETS

Aluminum sheets shall be alloy 5005, temper H15 or alloy 3003, temper H14 in compliance with ASTM B209.

2.7 EQUIPMENT ACCESS HATCH

2.7.1 Description

Furnish and install custom shop fabricated equipment access hatches at pumping stations 4A, 5D, 6B, 12-1, 15-C, 15E, and 15E-1, as indicated, and similar in character to existing hatches at pumping stations 12-2 and 15-D. Equipment access hatches shall consist of a vented curb and a removable hatch cover.

2.7.1.1 Equipment Access Hatch Submittal

Shop drawings for the Equipment Access Hatches shall be submitted and approved prior to commencement of work on the roof. The shop drawings shall include the following:

a. Concrete demolition plan: details, equipment, means and methods, temporary support and protective measures

b. In-fill concrete forming plan and details

c. Steel decking layout, fabrication and connection details

d. Product data for roof hatches, curbs, louvers and hatch closure device

e. Roof hatch installation plan, section and details

f. ICBO report for steel decking

g. ICBO report for concrete anchors

SECTION 07 72 00.10 28 - Page 5

2.7.1.2 Vented Curb

The vented curb shall be fabricated from minimum 1/8 inch thick aluminum.

The minimum clear opening for each vented curb, from inside face to inside face of opposing louvers, shall be equal to the rough opening in the concrete as indicated at each location with the following features:

a. Integral metal capflashing of the same gauge and material as the curb

b. Fully welded at the corners

c. Flanged for anchoring to the concrete roof slab

d. Concrete sleeve anchors or adhesive anchors, size and spacing as recommended by the fabricator

2.7.1.3 Louvers

Provide two operable louvers on opposing sides of each vented curb as indicated. Louvers shall not face the levee path due to vandalism from thrown rocks. Minimum free area for each operable louver shall be 95 square inches at full open position. The louvers shall be equipped with a bird screen, mechanically fastened with sheet metal screws. The operable louvers shall be a pull chain operated type with a spring return (to fully closed position). The pull chain operator shall be equipped with a means to maintain various opening positions. Pull chains shall be sufficiently long to allow for operation while standing on the pump house floor. Each pull chain operator may extend into the clear opening a maximum of 1 inch. The normal louver position shall be fully closed. Distance from the bottom of the louver openings to the roof deck shall be a minimum of 6 inch. Distance from the top of the louver openings to the top of the vented curb shall be a minimum of 2 inch.

2.7.1.4 Hatch Cover

The hatch cover shall be fabricated from minimum 1/8 inch thick aluminum.

The hatch cover shall be reinforced to support a minimum live load of 40 psf with a maximum deflection of 1/150th of the span or 20 psf wind uplift, with a sloped profile that will shed water. Removal of the cover shall be smooth and easy with a crane and shall not be affected by temperature. The entire hatch shall be weathertight with fully welded corner joints on cover and curb and have a heavy extruded Ethylene-Propylene-Diene-Monomer (EPDM) rubber gasket that is bonded to the cover interior to assure a continuous seal when compressed to the top surface of the curb. The hatch cover shall be secured to the vented curb with stainless steel, pad lockable, draw latches. Four draw latches per hatch. Minimum working load for each draw latch shall be 200 pounds. The hatch covers shall be completely removable and shall NOT be hinged. Each hatch shall be furnished with four lifting points. Minimum working load for each lifting point shall be 100 pounds.

2.7.2 Fabrication

All welds shall be ground flush to match adjacent surfaces. Mounting flanges shall be welded to the vented curb to facilitate anchoring to the roof. Minimum mounting flange width shall be 3-1/2 inch. The louvers shall be aluminum. All aluminum surfaces shall be mill finish.

SECTION 07 72 00.10 28 - Page 6

2.8 ROOF SCUTTLE WITH GUARDRAIL

2.8.1 General

The Contractor shall furnish and install a commercially available off-the-shelf roof scuttle supplied with a guardrail system at pumping station 2C, as indicated. The roof scuttle shall be a preassembled, single-leaf configuration. The scuttle shall have minimum inside clear dimensions of 3 feet-0 inches wide (hinge side) by 3 feet-0 inches long.

The roof hatch must be supplied with a guardrail system that mounts to the three open sides of the hatch to provide fall protection in accordance with 29 CFR 1926 when the hatch is in the open position. The guardrail system must be a standard product of the access hatch manufacturer and must mount with a factory-supplied brackets to the hatch curb assembly.

The guardrail system must be provided with a self-closing access gate of a size as standard with the hatch manufacturer.

2.8.2 Roof Scuttle Submittal

Shop drawings for the Roof Scuttle shall be submitted and approved prior to commencement of work on the roof. The shop drawings shall include the following:

a. Concrete demolition plan, details, equipment and methods

b. Product data for roof scuttle and guardrail system

c. Roof scuttle and guardrail system installation plan, section and details

2.8.3 Roof Scuttle Performance

The scuttle cover shall be reinforced to support a minimum live load of 40 psf with a maximum deflection of 1/150th of the span or 20 psf wind uplift. Operation of the cover shall be smooth and easy with controlled operation throughout the entire arc of opening and closing and shall not be affected by temperature. The entire scuttle shall be weathertight with fully welded corner joints on cover and curb.

2.8.4 Insulated Cover

The cover shall be 11 gauge aluminum with a 3-inch beaded flange with formed reinforcing members. Cover shall have a heavy extruded EPDM rubber gasket that is bonded to the cover interior to assure a continuous seal when compressed to the top surface of the curb. The cover shall be insulated with minimum 1-inch thick fiberglass or polystyrene that is fully covered and protected on the inside of the cover by an 18 gauge aluminum liner.

2.8.5 Insulated Scuttle Curb

The scuttle curb shall be a minimum 12 inches in height and constructed of minimum 11 gauge aluminum. The curb shall be formed with a minimum 3-1/2 inches wide flange with holes provided for securing to the roof deck. The curb shall be equipped with an integral metal capflashing of the same gauge and material as the curb, and fully welded at the corners. The curb shall be insulated on the outside (roof side) with minimum 1-inch thick rigid, high-density fiberboard per specification section 07 22 00.00 28.

SECTION 07 72 00.10 28 - Page 7

2.8.6 Lifting Mechanisms

The scuttle cover shall operate by means of compression springs enclosed in telescopic tubes to provide, smooth, easy, and controlled cover operation throughout the entire arc of opening and closing. The upper tube shall be sealed to the outer tube to prevent accumulation of moisture, grit, and debris inside the lower tube assembly. The lower tube shall interlock with a flanged support shoe and shall be welded to the curb assembly.

2.8.7 Scuttle Hardware and Operation

The roof scuttle shall be factory-equipped with all necessary hardware for operation of the scuttle cover including, but not limited to, pintle hinges, a spring latch with interior and exterior turn handles, interior and exterior padlock hasps and a latch strike. The cover shall automatically lock in the open position with a rigid hold open arm equipped with a minimum 1-inch diameter grip handle to permit easy release for closing. Compression spring tubes shall be an anti-corrosive composite material and all other hardware shall be made with Type 316 stainless steel. All cover hardware shall be bolted into heavy gauge channel reinforcing welded to the underside of the cover and concealed within the insulation space.

2.8.8 Finish

All aluminum components of the roof scuttle shall have a mill finish.

2.8.9 5-yr Roof Scuttle Manufacturer Warranty

The roof scuttle shall be provided with a manufacturer's standard warranty covering defects of material and workmanship for a period of five (5) years from the date of the Government's acceptance of installation.

Should any part of the roof scuttle fail to function within this time period, the manufacturer shall furnish to the Government a new part at no charge.

2.8.10 Acceptable Manufactured Product

The following table includes products which meet the above salient characteristics and are provided as reference only:

MANUFACTURER MODEL

The Bilco Company Type E-50

Babcock-Davis Type BRHP

PART 3 EXECUTION

3.1 REMOVAL OF ROOF VENTS AND ROOFING MATERIALS

Removal of existing roof vents and roofing materials shall be in accordance with SECTION 07 01 50.10 28 REMOVAL AND DISPOSAL and as indicated.

SECTION 07 72 00.10 28 - Page 8

3.2 CONCRETE REMOVAL

Submit a concrete removal plan describing methods for removal of concrete, protection of existing equipment, clean up and containment of debris and process water.

Cut openings into concrete roof slabs utilizing diamond saw for making a clean cut in the concrete. Cutting beyond the rough opening is not permitted. Pieces of the slab that will be removed by cutting shall be secured to prevent them from falling into the pumping station and damaging existing equipment. Utilize great caution to prevent damage to the pumps, motors, and electrical distribution. In addition, the Contractor shall design and install a method for containing concrete chips, spalled pieces, dust and water generated by cutting activities, to prevent them from contaminating inside surfaces and equipment of the pump houses.

All concrete rubble shall become the property of the Contractor and shall be disposed of off the project site. The Contractor shall also be responsible for cleaning all interior and exterior surfaces of the pump houses and interior pump house equipment contaminated with concrete dust and water containing concrete sediment. At the determination of the COR, any equipment damaged or made inoperable as a result of construction activities shall be repaired or replaced by the Contractor at no additional cost to the government.

Steel reinforcements and embedded conduits will be encountered during concrete cutting and drilling. The Contractor shall conduct an embedded material survey prior to concrete cutting and drilling using a non -destructive method. Submit survey for approval prior to concrete cutting and drilling. The survey shall identify all embedded materials that will be cut and the Contractor's plan to minimize the cutting of reinforcement. The Contractor may adjust or shift the locations to mimimize the amount of embedded materials to be cut or drilled.

Steel reinforcements exposed by demolition shall be coated with one coat of SSPC Paint 25 primer and two coats of semi-gloss alkyd enamel in compliance with MPI 47 . Color of finish coat shall be a light gray.

Embedded electrical conduits shall be de-energized and abandoned prior to concrete demolition. Exposed embedded conduits shall be plugged with an epoxy resin based or Portland cement based grout and troweled smooth to match the surrounding concrete.

3.3 ROOF MOUNTED ANTENNAS

Each pump house has an antenna mounted on the roof (with the exception of 12-1A and 15E-1). The antennas are mounted on a pipe mast cast into the concrete roof deck. If the Contractor determines it to be necessary to remove the antenna in order to prosecute the demolition work, removal shall be conducted with care. Unless otherwise indicated, the antennas shall be reinstalled with the new roof hatch system in the same location and orientation from which they were removed. The antennas shall have a watertight flashing installed with the roofing system as recommended by the roofing manufacturer and as indicated.

3.4 STRUCTURAL STEEL

Structural steel components shall be fabricated to the sizes and configurations indicated. All structural steel components shall be shop primed with SSPC Paint 25 . Threads of stainless steel nuts shall be

SECTION 07 72 00.10 28 - Page 9 coated with anti-galling compound prior to installation.

3.5 STEEL DECKING

Steel decking shall be installed in accordance with the Steel Deck Institute (SDI) Specification and Commentary for Steel Floor Decking and the approved shop drawings. Decking that is bent or with holes burned through it shall not be installed. Decking units shall be placed on secure supports, properly adjusted, and aligned at right angles to supports before being welded in place. Decking units shall be welded to supports with nominal 5/8-inch diameter puddle welds spaced at a maximum 12-inches on center. Welding of decking shall be in accordance with AWS D1.3 using methods and electrodes as recommended by the decking manufacturer.

3.6 CONCRETE

3.6.1 Steel Reinforcements

The Contractor shall furnish, cut, bend, and place all steel reinforcement as indicated. All reinforcement shall be free from loose, flaky rust and scale, and free from oil, grease, or other coating which might destroy or reduce its bond with the concrete. All placing of steel reinforcement shall be in accordance with ACI 318/318R , the contract drawings, and the Contractor's approved shop drawings. The minimum cover for all reinforcement shall be 1-1/2-inches.

3.6.2 Surface Preparation

Steel decking upon which concrete is to be placed shall be clean and free from frost, ice, and water. Before placing concrete, care shall be taken to determine that all embedded items are firmly and securely fastened in place as indicated on the drawings. Decking and embedded items shall be free of oil and other foreign matter such as loose coatings of rust, paint and scale.

3.6.3 Placing

The installation of steel decking and embedded items shall be approved by the COR prior to concrete placement. Concrete placement will not be permitted when, in the opinion of the COR, weather conditions prevent proper placement and consolidation. Concrete shall be deposited as close as possible to its final position. Concrete shall be delivered to the site of work and discharge shall be completed within 1-1/2 hours after introduction of the cement to the aggregates. When the concrete temperature exceeds 85° F, the placement shall be completed within 45 minutes. Concrete shall not be placed when adverse weather conditions exist. These conditions are when ambient air temperatures are below 40° F or above 90 F, or when rain, snow, hail, or wind (in excess of 25 miles per hour) occurs at the placing site. Concrete shall be consolidated around rebar and other embedded items by means of rodding or vibration.

3.6.4 Cold Weather Requirements

Special protection measures, approved by the COR, shall be used if freezing temperatures are anticipated before the expiration of the specified curing period. The ambient temperature of the air where concrete is to be placed and the temperature of surfaces to receive concrete shall not be less than 40°F. The temperature of the concrete when placed shall not be less than 40°F. Heating of the mixing water or aggregates will be

SECTION 07 72 00.10 28 - Page 10 required to regulate the concrete placing temperature. Materials entering the mixer shall be free from ice, snow, or frozen lumps. Salt, chemicals or other materials shall not be incorporated into the concrete to prevent freezing. Upon approval of the Contracting Officer, a chemical admixture conforming to ASTM C 494 , Type C or E may be used, however, no admixtures containing more than trace amounts of chloride shall be used.

3.6.5 Hot Weather Requirements

The temperature of the concrete placed during warm weather shall not exceed 85°F except where an approved retarder is used. The mixing water and/or aggregates shall be cooled, if necessary, to maintain a satisfactory placing temperature. In no case, shall the placing temperature exceed 90°F.

3.6.6 Surface Finish

The ambient temperature of spaces adjacent to surfaces being finished shall not be less than 50°F. Surfaces of new slab shall be screeded and floated to bring the surface level with adjacent existing concrete surfaces and to match the slope of existing adjacent concrete surfaces. No coarse aggregate shall be visible. No cement mortar, or water shall be added to the surface during finishing operations. The concrete, while still green, but sufficiently hard to bear a man's weight without deep imprint, shall be floated to a true and even plane. Hand floats shall be made of magnesium or aluminum. Tolerance for a floated finish shall be true plane within 1/8-inch in 5 feet as determined by a straight edge placed anywhere on the slab in any direction. The top surface of new and existing concrete roof decks shall be flush.

3.6.7 Curing and Protection

Beginning immediately after placement and continuing for at least 7 days, all concrete shall be cured and protected from premature drying, extremes in temperature, rapid temperature change, freezing, mechanical damage, and exposure to rain or flowing water. All materials and equipment needed for adequate curing and protection shall be available and at the site of the placement prior to the start of concrete placement. Preservation of moisture for concrete surfaces not in contact with forms shall be accomplished by application of impervious sheet material conforming to

ASTM C 171 .

3.7 THERMAL & MOISTURE PROTECTION

3.7.1 Protection and Coordination Requirements

Areas of the pump house roofs to be left open during the course of construction shall be covered with tarps or other approved means at the end of each day to protect the pump house interior from inclement weather.

3.7.2 Roofing

Re-roofing shall be commence as soon as possible following the installation of each roof hatch. Roofing shall be in accordance with

SECTION 07 56 00.10 28 PMMA FLUID-APPLIED ROOFING.

3.8 ROOF SCUTTLE AND EQUIPMENT ACCESS HATCH INSTALLATION

Installation shall be coordinated with placement of new rigid insulation, SECTION 07 72 00.10 28 - Page 11 wood curbing, and roofing membrane, and shall be installed in accordance with approved shop drawings, and the manufacturer's published instructions. The installation shall be watertight. All metal surfaces shall be isolated and protected from direct contact with dissimilar metals using elastomeric tapes or sealants as recommended by the manufacturer.

Aluminum surfaces which will be in contact with weatherproofing sealants shall not be coated with a protective material. Provide a continuous bead of polyurethane sealant between the mounting flange and the wood curbing or concrete deck it will sit on as indicated. After installation, test for correct and smooth operation through their full range of functions and must operate without binding, warping or similar problems that result in improper functioning of the units or that may lead to premature failure of unit operation components due to stress and fatigue. Unit components that do not function properly or that have been damaged during fabrication, shipment or installation shall be replaced with new components. Once anchored in place, apply flashing, and roofing to completely conceal the mounting hardware and form a weather tight seal. Anchor bolts shall be as recommended by the manufacturer, and shall not protrude above the nut/washer assembly by more than 1/4 inch.

3.9 PROTECTION

Exposed finish surfaces of the roof scuttle and equipment access hatches shall be protected against the accumulation of paint, grime, mastic, disfigurement, discoloration and damage for duration of construction activities.

3.10 ROOF SCUTTLE PREVENTATIVE MAINTENANCE AND CARE INSTRUCTIONS

Furnish written instructions on proper maintenance procedures for the personnel scuttle.

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SECTION 07 72 00.10 28 - Page 12

2.7.2 Fabrication