am_6.pdf

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15A. NAME AND TITLE OF SIGNER (Type or print)

30-105-04EXCEPTION TO SF 30

APPROVED BY OIRM 11-84

STANDARD FORM 30 (Rev. 10-83) Prescribed by GSA

FAR (48 CFR) 53 243

The Request for Proposal for IDIQ MATOC for Construction Services (Design-Build) for the US Army Corps of Engineers, Southwestern Division (SWD), Small Business Set Aside, primarily Red River Army Depot, Texarkana, Texas, is amended as follows:

Section 23 00 00 – AIR SUPPLY, DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEMS.- Replace section 23 00 00 with the accompanying new section 23 00 00, bearing the notation “AMENDMENT 0006”.

End of Amendment

NOTE: Proposal due date and time remain October 8, 2009 at 2:00 p.m. local time, as previously announced.

1. CONTRACT ID CODE PAGE OF PAGES

J 1 1

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

16C. DATE SIGNED

BY

16B. UNITED STATES OF AMERICA15C. DATE SIGNED15B. CONTRACTOR/OFFEROR

(Signature of Contracting Officer)(Signature of person authorized to sign)

8. NAME AND ADDRESS OF CONTRACTOR (No., Street, County, State and Zip Code) X 9A. AMENDMENT OF SOLICITATION NO.

W9126G-09-R-0096

X 9B. DATED (SEE ITEM 11)

30-July-2009

10B. DATED (SEE ITEM 13)

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

X The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offer is extended, X is not extended.

Offer must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended by one of the following methods:

(a) By completing Items 8 and 15, and returning copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

12. ACCOUNTING AND APPROPRIATION DATA (If required)

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE

CONTRACT ORDER NO. IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(B).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

E. IMPORTANT: Contractor is not, is required to sign this document and return copies to the issuing office.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

10A. MOD. OF CONTRACT/ORDER NO.

2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO.(If applicable)

6. ISSUED BY

3. EFFECTIVE DATE

2-Oct-2009

CODE

US ARMY ENGINEER DISTRICT, FORT WORTH

ATTN: CESWF-CT

819 TAYLOR ST, ROOM 2A19

P.O. BOX 17300

FORT WORTH TX 76102-0300

W9126G 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE

See Item 6

FACILITY CODECODE

EMAIL:TEL:

AMENDMENT 0006

PR46-03, Repair/Improve Heating/Ventilating Systems - Bldg 493

Section 23 00 00 Page 1

SECTION 23 00 00

AIR SUPPLY, DISTRIBUTION, VENTILATION,

AND EXHAUST SYSTEMS

PART 1 GENERAL

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.

AIR MOVEMENT AND CONTROL ASSOCIATION INTERNATIONAL (AMCA)

AMCA210 (1999; 2001a) Laboratory Methods of

Testing Fans for Aerodynamic Performance Rating

AMCA 220 (2005) Test Methods for Air Curtain Units

AMCA 300 (2005) Reverberant Room Method for Sound

Testing of Fans

AMCA 301 (2005) Methods for Calculating Fan Sound

Ratings from Laboratory Test Data

AMCA 500-D (1998) Laboratory Methods of Testing

Dampers for Rating

AIR-CONDITIONING AND REFRIGERATION INSTITUTE (ARI)

ARI Guideline D (1996) Application and Installation of

Central Station Air-Handling Units

AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING

ENGINEERS (ASHRAE)

ASHRAE 62.1 (2007; Interpretation 1: 2007) Ventilation for Acceptable Indoor Air Quality

ASHRAE 90.1 - IP (2004; Addendas a,b,c,d,e,f,g,h,i,j, k,l,m,n,o,p,r,s,t,u,v,x,ak 2006; Supp to Addendas 2006; Errata 2007) Energy Standard for Buildings Except Low-Rise Residential Buildings, I-P Edition

ASTM INTERNATIONAL (ASTM)

ASTM A 123/A 123M (2002) Standard Specification for Zinc

(Hot-Dip Galvanized) Coatings on Iron and Steel Products

ASTM A 924/A 924M (2007) Standard Specification for General

Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip Process

ASTM B 117 (2007) Standing Practice for Operating

Salt Spray (Fog) Apparatus

Section 23 00 00 Page 2

ASTM D 1654 (2005) Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments

ASTM D 3359 (2002) Measuring Adhesion by Tape Test

ASTM D 520 (2000; R 2005) Zinc Dust Pigment

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

NEMA MG 1 (2006; Errata 2007) Standard for Motors and Generators

NEMA MG 10 (2001; R 2007) Energy Management Guide For Selection and Use of Fixed Frequency

Medium AC Squirrel-Cage Polyphase Induction Motors

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 701 (2004) Fire Tests for Flame Propagation Of Textiles and Films

SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL ASSOCIATION

(SMACNA)

SMACNA HVAC Duct Const Stds (1995; Addendum 1997, 2nd Ed) HVAC Duct

Construction Standards - Metal and Flexible

SMACNA Industry Practice (1975, 1st Ed) Accepted Industry Practice for Industrial Duct Construction

UNDERWRITERS LABORATORIES (UL)

UL 900 (2004) Standard for Air Filter Units

UL Bld Mat Dir (2007) Building Materials Directory

1.2 COORDINATION OF TRADES

Furnish ductwork, piping offsets, fittings, and accessories as required to provide a complete installation and to eliminate interference with other construction.

1.3 DELIVERY AND STORAGE

Store equipment at the jobsite so that it is protected from the weather, humidity and temperature variations, dirt and dust, or other contaminants. Additionally, cap or plug all pipes until installed.

1.4 FIELD MEASUREMENTS

After becoming familiar with all details of the work, the Contractor shall verify all dimensions in the field, and shall advise the Contracting Officer of any discrepancy before performing the work.

1.5 SUBMITTALS

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

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office

Section 23 00 00 Page 3 that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-03 Product Data

Components and Equipment;

Manufacturer's catalog data included with the detail drawings for the following items. Highlight the data to show model, size, options, etc., that are intended for consideration. Provide adequate data to demonstrate compliance with contract requirements for the following:

Manual Balancing Dampers; G Registers and Grilles; G Air-Curtain Fans; G Steam Preheat (Nonfreeze) Coils; G Diagrams; G

Proposed diagrams, at least 2 weeks prior to start of related testing. System diagrams that show the layout of equipment, piping, and ductwork, and typed condensed operation manuals explaining preventative maintenance procedures, methods of checking the system for normal, safe operation, and procedures for safely starting and stopping the system shall be framed under glass or laminated plastic. After approval, these items shall be posted where directed.

Operation and Maintenance Training; G

Proposed On-site Training schedule, submitted concurrently with the Operation and Maintenance Manuals.

SD-06 Test Reports

Performance Tests; G

Test reports for the performance tests in booklet form, upon completion of testing. Document phases of tests performed including initial test summary, repairs/adjustments made, and final test results in the reports.

SD-08 Manufacturer's Instructions

Manufacturer's Installation Instructions;

Operation and Maintenance Training;

SD-10 Operation and Maintenance Data

Operation and Maintenance Manuals;

Six manuals at least 2 weeks prior to field training. Submit the following:

Air-Curtain Fans; G

PART 2 PRODUCTS

2.1 STANDARD PRODUCTS

Provide Components and equipment that are "standard products" of a manufacturer regularly engaged in the manufacturing of products that are of a similar material, design and workmanship. "Standard products" is

Section 23 00 00 Page 4 defined as being in satisfactory commercial or industrial use for 2 years before bid opening. The 2-year manufacturer's experience shall include applications of components and equipment under similar circumstances and of similar size. The 2 years must be satisfactorily completed by a product that is sold on the commercial market through advertisements, manufacturers' catalogs, or brochures. Products having less than a 2-year field service record will be acceptable if a certified record of satisfactory field operation, for not less than 6000 hours exclusive of the manufacturer's factory tests, can be shown. The equipment items shall be supported by a service organization. Where applicable, provide equipment that is an ENERGY STAR Qualified product or a Federal Energy Management Program (FEMP) designated product.

2.2 ASBESTOS PROHIBITION

Asbestos and asbestos-containing products shall not be used.

2.3 NAMEPLATES

All equipment shall have a nameplate, installed by the manufacturer that identifies the manufacturer's name, address, type or style, and model or serial number.

2.4 EQUIPMENT GUARDS AND ACCESS

Belts, pulleys, chains, gears, couplings, projecting setscrews, keys, and other rotating parts exposed to personnel contact shall be fully enclosed or guarded according to OSHA requirements. High temperature equipment and piping exposed to contact by personnel or where it creates a potential fire hazard shall be properly guarded or covered with insulation of a type specified.

2.5 ELECTRICAL WORK

a. Provide motors, controllers, integral disconnects, contactors, and controls with their respective pieces of equipment. Provide electrical equipment, including motors and wiring, as specified in Section 26 20 00 INTERIOR DISTRIBUTION SYSTEM. Manual or automatic control and protective or signal devices required for the operation specified and control wiring required for controls and devices specified, but not shown, shall be provided.

b. For polyphase motors, provide squirrel-cage medium induction motors, including motors that are part of a system, and that meet the efficiency ratings for premium efficiency motors in accordance with NEMA MG 1. Select premium efficiency polyphase motors in accordance with NEMA MG 10.

c. Provide motors in accordance with NEMA MG 1 and of sufficient size to drive the load at the specified capacity without exceeding the nameplate rating of the motor. Motors shall be rated for continuous duty with the enclosure specified. Motor duty requirements shall allow for maximum frequency start-stop operation and minimum encountered interval between start and stop. Motor torque shall be capable of accelerating the connected load within 20 seconds with 80 percent of the rated voltage maintained at motor terminals during one starting period. Provide motor starters complete with thermal overload protection and other necessary appurtenances. Motor bearings shall be fitted with grease supply fittings and grease relief to outside of the enclosure.

d. Where two-speed motors are indicated, solid-state variable-speed controllers may be provided to accomplish the same function.

Section 23 00 00 Page 5

2.6 INDOOR AIR QUALITY

All equipment and components furnished as part of this Section shall comply with the requirements of ASHRAE 62.1 unless more stringent requirements are specified herein.

2.7 DUCT SYSTEMS

2.7.1 Metal Ductwork

All aspects of metal ductwork construction, including all fittings and components, shall comply with SMACNA HVAC Duct Const Stds unless otherwise specified. Elbows shall be radius type with a centerline radius of 1.5 times the width or diameter of the duct where space permits, unless shown otherwise. Otherwise, elbows having a minimum radius equal to the width or diameter of the duct or square elbows with factory fabricated turning vanes may be used. Ductwork shall meet the requirements of Seal Class A. Sealants shall conform to fire hazard classification specified in Section 23 07 00 THERMAL INSULATION FOR MECHANICAL SYSTEMS and shall be suitable for the range of air distribution and ambient temperatures that it will be exposed to. Do not use pressure sensitive tape as a sealant.

2.7.1.1 General Service Duct Connectors

Provide a flexible duct connector approximately 6 inches in width where sheet metal connections are made to fans or where ducts of dissimilar metals are connected. For round/oval ducts, secure the flexible material by stainless steel or zinc-coated, iron clinch-type draw bands.

For rectangular ducts, install the flexible material locked to metal collars using normal duct construction methods. The composite connector system shall comply with NFPA 701 and be classified as "flame-retarded fabrics" in UL Bld Mat Dir.

2.7.2 Ductwork Accessories

2.7.2.1 Manual Balancing Dampers

Furnish manual balancing dampers with accessible operating mechanisms.

Manual volume control dampers shall be operated by locking-type quadrant operators. Dampers shall be 2 gauges heavier than the duct in which installed. Unless otherwise indicated, multi leaf dampers shall be opposed blade type with maximum blade width of 12 inches.

2.7.2.2 Turning Vanes and Branch Connections

Provide turning vanes at all 90 degree elbows, as well as at locations as indicated on the drawings or otherwise specified. Conical branch connections or 45 degree entry connections shall be used for branch connections. Air deflectors shall be factory-fabricated units consisting of curved turning vanes or louver blades designed to provide uniform air distribution and change of direction with minimum turbulence or pressure loss. Air deflectors shall be factory or field assembled.

Fixed air deflectors, also called turning vanes, shall be provided in 90 degree elbows.

2.7.2.3 Dampers

Where outdoor air supply and exhaust air dampers are required they shall have a maximum leakage rate when tested in accordance with AMCA 500-D as required by ASHRAE 90.1 - IP, including: Maximum Damper Leakage for: 1) Climate Zones 1,2,6,7,8 the maximum damper leakage at 1.0 inch w.g. for

Section 23 00 00 Page 6 motorized dampers is 4 cfm per SQFT of damper area and non-motorized dampers are not allowed. 2) All other Climate Zones the maximum damper leakage at 1.0 inch w.g. is 10 cfm per SQFT and for non-motorized dampers is 20 cfm per SQFT of damper area. Dampers smaller than 24 inches in either direction may have leakage of 40 cfm per SQFT.

2.7.3 Plenums and Casings for Field-Fabricated/Modified Units

2.7.3.1 Plenum and Casings

Fabricate and erect plenums and casings as shown in SMACNA HVAC Duct Const Stds, as applicable. Construct system casing of not less than 16 gauge galvanized sheet steel. Seal openings in the casing, such as for piping connections, to prevent air leakage.

2.7.3.2 Access Doors

Provide access doors in each section of the casing where new coils are added. Weld doorframes in place, gasket each door with neoprene, hinge with minimum of two brass hinges, and fasten with a minimum of two brass tension fasteners operable from inside and outside of the casing. Doors shall be sized to allow replacement of the coils and shall swing so that fan suction or pressure holds door in closed position, and shall be airtight.

2.7.3.3 Factory-Fabricated Insulated Sheet Metal Panels

Factory-fabricated components may be used for field-assembled units, provided all requirements specified for field-fabricated plenums and casings are met. Panels shall be of modular design, pretested for structural strength, thermal control, condensation control, and acoustical control. Panel joints shall be sealed and insulated access doors shall be provided and gasketed to prevent air leakage. Panel construction shall be not less than 20 gauge galvanized sheet steel and shall be assembled with fasteners treated against corrosion. Standard length panels shall deflect not more than 1/2 inch under operation.

Details of construction, including joint sealing, not specifically covered shall be as indicated in SMACNA HVAC Duct Const Stds. Construct the plenums and casings to withstand the specified internal pressure of the air systems.

2.7.4 Registers and Grilles

Units shall be factory-fabricated of aluminum and shall be as scheduled on the drawings.

2.8 AIR SYSTEMS EQUIPMENT

2.8.1 Fans

Fans shall be tested and rated according to AMCA 210. The sound power level of the fans shall not exceed 85 dBA when tested per AMCA 300 and rated per AMCA 301. All fans shall have an AMCA seal. Connect fans to the motors indirectly with V-belt drive. Use V-belt drives designed for not less than 150percent of the connected driving capacity. Motor sheaves shall be variable pitch for 15 hp and below and fixed pitch as defined by ARI Guideline D. Select variable pitch sheaves to drive the fan at a speed which will produce the specified capacity when set at the approximate midpoint of the sheave adjustment. When fixed pitch sheaves are furnished, provide a replaceable sheave when needed to achieve system air balance. Provide motors for V-belt drives with adjustable rails or bases. Provide speed-test openings at the center of all rotating shafts. Provide fan and motor assemblies with vibration-

Section 23 00 00 Page 7 isolation supports or mountings as indicated, all completely enclosed within the air curtain cabinet. Use vibration-isolation units that are standard products with published loading ratings. Select each fan to produce the capacity required.

2.8.1.1 Air-Curtain Fans

Fans shall conform to AMCA 220 with AMCA seal. Furnish air curtains with a weatherproof housing constructed of minimum 18 gauge rigid welded steel. Fan wheels shall be forward curved, non-overloading, centrifugal type and accurately balanced statically and dynamically. Motors shall have totally enclosed fan cooled enclosures. Motor starters shall be remote manual type with weather-resistant enclosure actuated when the doorway served is open. The air curtains shall attain the air velocities specified within 2 seconds following activation. Provide bird screens at air intake and discharge openings. Air curtain unit or a multiple unit installation shall be at least as wide as the opening to be protected. Provide the air discharge openings to permit outward adjustment of the discharge air. Adjustment and installation placement shall be according to the manufacturer's written recommendation. Air curtains shall be designed to prevent the adjustment of the air velocities specified. The interior surfaces of the air curtain units shall be accessible for cleaning. Provide certified test data indicating that the fan will provide the air velocities required when fan is mounted as indicated. Provide air curtains designed as fly fans unless otherwise indicated. Air curtains shall develop an air curtain not less than 3 inches thick at the discharge nozzle. The air velocity shall be not less than 1600 fpm across the entire entryway when measured 3 feet above the floor.

Recirculating type air curtains shall be equipped with readily removable filters, or the filters shall be designed for in-position cleaning. The air capture compartment shall be readily accessible and easily cleanable or designed for in-position cleaning.

2.8.2 Coils

Coils shall be fin-and-tube type constructed of seamless copper tubes and aluminum fins mechanically bonded or soldered to the tubes. Copper tube wall thickness shall be a minimum of 0.035 inches. Aluminum fins shall be 0.0075 inch minimum thickness. Casing and tube support sheets shall be not lighter than 16 gauge galvanized steel, formed to provide structural strength. When required, multiple tube supports shall be provided to prevent tube sag. Each coil shall be tested at the factory under water at not less than 400 psi air pressure and shall be suitable for 200 psi working pressure and 300 degrees F operating temperature unless otherwise stated. Mount coils for counterflow service.

2.8.2.1 Steam Preheat (Nonfreeze) Coils

Steam Preheat (Nonfreeze) Coils shall be steam-distribution-tube type with condensing tubes not less than 1 1/8inch outside diameter.

Construct headers from cast iron, welded steel, or copper. Distribution tubes shall be not less than 5/8 inch outside diameter with orifices to discharge steam to condensing tubes. Distribution tubes shall be installed concentric inside of condensing tubes and shall be held securely in alignment. Maximum length of a single coil shall be limited to 144 inches. Coils shall be factory tested to ensure that, when supplied with a uniform face velocity, temperature across the leaving side will be uniform with a maximum variation of no more than 5 percent.

2.8.3 Air Filters

Air filters shall be listed according to requirements of UL 900.

Section 23 00 00 Page 8

2.8.3.1 Sectional Cleanable Filters

Cleanable filters shall be 2 inches thick. Viscous adhesive shall be provided in 5 gallon containers in sufficient quantity for 12 cleaning operations and not less than one quart for each filter section. One washing and charging tank shall be provided. Each washing and charging unit shall consist of a tank and double drain rack mounted on legs.

Drain rack shall be provided with dividers and partitions to properly support the filters in the draining position.

2.8.3.2 Filter Gauges

Filter gauges shall be dial type, diaphragm actuated draft and shall be provided for all filter stations, including those filters which are furnished as integral parts of factory fabricated air handling units.

Gauges shall be at least 3-7/8 inches in diameter, shall have white dials with black figures, and shall be graduated in 0.01 inch of water, and shall have a minimum range of 1 inch of water beyond the specified final resistance for the filter bank on which each gauge is applied.

Each gauge shall incorporate a screw operated zero adjustment and shall be furnished complete with two static pressure tips with integral compression fittings, two molded plastic vent valves, two 5 foot minimum lengths of 1/4 inch diameter aluminum tubing, and all hardware and accessories for gauge mounting.

2.9 FACTORY PAINTING

Units which are not of galvanized construction according to ASTM A 123/A 123M or ASTM A 924/A 924M shall be factory painted with a corrosion resisting paint finish. Internal and external ferrous metal surfaces shall be cleaned, phosphatized and coated with a paint finish which has been tested according to ASTM B 117, ASTM D 1654, and ASTM D 3359. Evidence of satisfactory paint performance for a minimum of 125 hours for units to be installed indoors and 500 hours for units to be installed outdoors shall be submitted. Rating of failure at the scribe mark shall be not less than 6, average creepage not greater than 1/8 inch. Rating of the inscribed area shall not be less than 10, no failure. On units constructed of galvanized steel that have been welded, exterior surfaces of welds or welds that have burned through from the interior shall receive a final shop docket of zinc-rich protective paint according to ASTM D 520 Type I.

2.10 FIELD PAINTING

Clean, pretreat, prime and paint metal surfaces; except aluminum surfaces need not be painted. Apply coatings to clean dry surfaces.

Clean the surfaces to remove dust, dirt, rust, oil and grease by wire brushing and solvent degreasing prior to application of paint, except metal surfaces subject to temperatures in excess of 120 degrees F shall be cleaned to bare metal. Where more than one coat of paint is specified, apply the second coat after the preceding coat is thoroughly dry. Lightly sand damaged painting and retouch before applying the succeeding coat. Color of finish coat shall be aluminum or light gray.

a. Temperatures less than 120 degrees F: Immediately after cleaning, the metal surfaces subject to temperatures less than 120 degrees F shall receive one coat of pretreatment primer applied to a minimum dry film thickness of 0.3 mil, one coat of primer applied to a minimum dry film thickness of one mil; and two coats of enamel applied to a minimum dry film thickness of one mil per coat.

Section 23 00 00 Page 9

b. Temperatures between 120 and 400 degrees F: Metal surfaces subject to temperatures between 120 and 400 degrees F shall receive two coats of 400 degrees F heat-resisting enamel applied to a total minimum thickness of two mils.

c. Temperatures greater than 400 degrees F: Metal surfaces subject to temperatures greater than 400 degrees F shall receive two coats of 315 degrees C 600 degrees F heat-resisting paint applied to a total minimum dry film thickness of two mils.

2.11 SUPPLEMENTAL COMPONENTS/SERVICES

2.11.1 Steam Heating System Accessories

The requirements for steam heating accessories such as steam traps are specified in Section 23 70 03.00 10 HEATING AND UTILITIES SYSTEMS, CENTRAL STEAM.

2.11.2 Insulation

The requirements for shop and field applied insulation are specified in Section 23 07 00 THERMAL INSULATION FOR MECHANICAL SYSTEMS.

2.11.3 Controls

The requirements for controls are specified in Section 23 05 93.00 10 TESTING, ADJUSTING, AND BALANCING OF HVAC SYSTEMS and Section 23 09

33.00 40 ELECTRIC AND ELECTRONIC CONTROL SYSTEM FOR HVAC.

PART 3 EXECUTION

3.1 INSTALLATION

Installation shall be as shown and according to the manufacturer's diagrams, recommendations and manufacturer's installation instructions.

3.1.1 Equipment and Installation

Provide frames and supports for coils, dampers, and other similar items requiring supports. The method of anchoring and fastening shall be as detailed, or as recommended by manufacturer.

3.1.2 Metal Ductwork

Installation shall be according to SMACNA HVAC Duct Const Stds unless otherwise indicated. Duct supports for sheet metal ductwork shall be according to SMACNA HVAC Duct Const Stds, unless otherwise specified.

Friction beam clamps indicated in SMACNA HVAC Duct Const Stds shall not be used. Supports on the risers shall allow free vertical movement of the duct. Supports shall be attached only to structural framing members and concrete slabs. Supports shall not be anchored to metal decking unless a means is provided and approved for preventing the anchor from puncturing the metal decking. Where supports are required between structural framing members, suitable intermediate metal framing shall be provided. Where C-clamps are used, retainer clips shall be provided.

3.1.3 FRP Ductwork

Fibrous glass reinforced plastic ducting and related structures shall conform to SMACNA Industry Practice. Flanged joints shall be provided where indicated. Crevice-free butt lay-up joints are acceptable where

Section 23 00 00 Page 10 flanged joints are not indicated. When ambient temperatures are lower than 50 degrees F, joints shall be heat cured by exothermic reaction heat packs.

3.1.4 Dust Control

To prevent the accumulation of dust, debris and foreign material during construction, temporary dust control protection shall be provided. The distribution system (supply and return) shall be protected with temporary seal-offs at all inlets and outlets at the end of each day's work. Temporary protection shall remain in place until system is ready for startup.

3.1.5 Insulation

Thickness and application of insulation materials for ductwork, piping, and equipment shall be according to Section 23 07 00 THERMAL INSULATION

FOR MECHANICAL SYSTEMS.

3.1.6 Duct Test Holes

Holes with closures or threaded holes with plugs shall be provided in ducts and plenums as indicated or where necessary for the use of pitot tube in balancing the air system. Extensions, complete with cap or plug, shall be provided where the ducts are insulated.

3.1.7 Power Transmission Components Adjustment

V-belts and sheaves shall be tested for proper alignment and tension prior to operation and after 72 hours of operation at final speed. Belts on drive side shall be uniformly loaded, not bouncing. Alignment of direct driven couplings shall be to within 50 percent of manufacturer's maximum allowable range of misalignment.

3.2 TESTING, ADJUSTING, AND BALANCING

The requirements for testing, adjusting, and balancing are specified in Section 23 05 93.00 10 TESTING, ADJUSTING, AND BALANCING OF HVAC SYSTEMS. Testing, adjusting, and balancing shall begin only when the air supply and distribution, including controls, has been completed, with the exception of performance tests.

3.3 PERFORMANCE TESTS

After testing, adjusting, and balancing is complete as specified, test each system as a whole to see that all items perform as integral parts of the system and temperatures and conditions are evenly controlled throughout the building. Make corrections and adjustments as necessary to produce the conditions indicated or specified. Capacity tests and general operating tests shall be conducted by an experienced engineer.

Tests shall cover a period of not less than three days for each system and shall demonstrate that the entire system is functioning according to the specifications.

3.4 CLEANING AND ADJUSTING

Inside of ducts, plenums, and casing shall be thoroughly cleaned of debris and blown free of small particles of rubbish and dust and then shall be vacuum cleaned before installing outlet faces. Wipe equipment clean, with no traces of oil, dust, dirt, or paint spots. Temporary filters shall be provided prior to startup of all fans that are operated during construction, and new filters shall be installed after all construction dirt has been removed from the building, and the ducts, Section 23 00 00 Page 11 plenums, casings, and other items specified have been vacuum cleaned.

Maintain system in this clean condition until final acceptance.

Properly lubricate bearings with oil or grease as recommended by the manufacturer. Tighten belts to proper tension. Adjust control valves and other miscellaneous equipment requiring adjustment to setting indicated or directed. Adjust fans to the speed indicated by the manufacturer to meet specified conditions.

(AM #6)

DUCT CLEANING:

Engage a qualified air system cleaning specialist (ASCS) to clean the supply air duct system for each of the eight existing Heating and Ventilating Units. The ASCS shall be a certified member of the National Air Duct Cleaners Association (NADCA) or other nationally recognized, nonprofit industry organization dedicated to the cleaning of HVAC systems

Perform cleaning before air balancing or mark position of dampers and air-directional mechanical devices before cleaning.

Create service openings in the system as necessary in order to accommodate cleaning of otherwise inaccessible areas. Mechanically clean all duct systems to remove all visible contaminants, such that the systems are capable of passing Cleaning Verification Testing (see NADCA Standards).

Health and Safety Standards: Cleaning contractors shall comply with all applicable federal, state, and local requirements for protecting the safety of the contractors' employees, building occupants, and the environment. In particular, all applicable standards of the Occupational Safety and Health Administration (OSHA) shall be followed when working in accordance with this specification.

Occupant Safety: No processes or materials shall be employed in such a manner that they will introduce additional hazards into occupied spaces.

Disposal of Debris: All Debris removed from the HVAC System shall be disposed of in accordance with applicable federal, state and local requirements and the “Building Cleanup Requirements” on Drawing Sheet M7.

Mechanical Cleaning Methodology Source Removal Cleaning Methods: The HVAC system shall be cleaned using Source Removal mechanical cleaning methods designed to extract contaminants from within the HVAC system and safely remove contaminants from the facility. It is the contractor’s responsibility to select Source Removal methods which will render the HVAC system Visibly Clean and capable of passing cleaning verification methods (See applicable NADCA Standards) and other specified tests, in accordance with all general requirements. No cleaning method, or combination of methods, shall be used which could potentially damage components of the HVAC system or negatively alter the integrity of the system. All methods used shall incorporate the use of vacuum collection devices that are operated continuously during cleaning. A vacuum device shall be connected to the downstream end of

Section 23 00 00 Page 12 the section being cleaned through a predetermined opening. The vacuum collection device must be of sufficient power to render all areas being cleaned under negative pressure, such that containment of debris and the protection of the indoor environment are assured. All vacuum devices exhausting air inside the building shall be equipped with HEPA filters (minimum efficiency), including hand-held vacuums and wet-vacuums. All vacuum devices exhausting air outside the facility shall be equipped with Particulate Collection including adequate filtration to contain debris removed from the HVAC system. Such devices shall exhaust in a manner that will not allow contaminants to re-enter the facility. Release of debris outdoors must not violate any outdoor environmental standards, codes or regulations. All methods require mechanical agitation devices to dislodge debris adhered to interior HVAC system surfaces, such that debris may be safely conveyed to vacuum collection devices. Acceptable methods will include those which will not potentially damage the integrity of the ductwork, nor damage porous surface materials such as liners inside the ductwork or system components.

Cleaning of coils: Any cleaning method may be used which will render the Coil Visibly Clean and capable of passing Coil Cleaning Verification (see applicable NADCA Standards). Cleaning methods shall not cause any appreciable damage to, displacement of, inhibit heat transfer, or erosion of the coil surface or fins, and shall conform to coil manufacturer recommendations when available. Coils shall be thoroughly rinsed with clean water to remove any latent residues.

Biocidal Agents and Coatings: Biocidal agents shall only be applied if active fungal growth is reasonably suspected, or where unacceptable levels of fungal contamination have been verified through testing.

Application of any biocidal agents used to control the growth of fungal or bacteriological contaminants shall be performed after the removal of surface deposits and debris. Only biocidal agents registered by the U.S. Environmental Protection Agency (EPA) specifically for use within HVAC system shall be used. Biocidal agents shall be applied in strict accordance with manufacturer’s instructions. Biocidal coating products for both porous and non-porous surfaces shall be EPA registered water soluble solutions with supporting efficacy data and MSDS records.

Biocidal coatings shall be applied according to manufacturer’s instructions. Coatings shall be sprayed directly onto interior ductwork surfaces, rather than “fogged” downstream onto surfaces. A continuous film must be achieved on the surface to be treated by the coating application. Application of any biocidal coatings shall be in strict accordance with manufacturer’s minimum millage surface application rate standards for effectiveness.

Cleanliness Verification General: Verification of HVAC System cleanliness will be determined after mechanical cleaning and before the application of any treatment or introduction of any treatment-related substance to the HVAC system, including biocidal agents and coatings.

Visual Inspection: the HVAC system shall be inspected visually to ensure that no visible contaminants are present. If no contaminants are evident through visual inspection, the HVAC system shall be considered clean; however, the Government reserves the right to further verify system cleanliness through gravimetric or wipe testing analysis

Section 23 00 00 Page 13 testing as specified herein. If visible contaminants are evident through visual inspection, those portions of the system where contaminants are visible shall be re-cleaned and subjected to re-inspection for cleanliness.

Gravimetric Analysis: At the discretion and expense of the Government, sections of the HVAC system may be tested for cleanliness using the NADCA Vacuum Test (gravimetric analysis) as specified in applicable NADCA Standards. Levels of debris collected shall be equal to or less than acceptable levels defined in applicable NADCA Standards. If gravimetric analysis determines that levels of debris are equal to or lower than those levels specified in applicable NADCA standards, the system shall be considered clean and shall have passed cleanliness verification. If gravimetric analysis determines that levels of debris exceed those specified in applicable NADCA standards, the system shall not be considered clean and those sections of the system which failed cleanliness verification shall be re-cleaned at the expense of the HVAC system cleaning contractor. Gravimetric analysis shall be performed by a qualified third party experienced in testing of this nature.

Cleanliness verification shall be performed immediately after mechanical cleaning and before the HVAC system is restored to normal operation.

Verification of Coil Cleaning: The coil will be considered clean only if the coil is free of foreign matter and chemical residue, based on a thorough visual inspection (see NADCA Standards).

Post-Project Report: At the conclusion of the project, the Contractor shall provide a report to the C.O.R. indicating the following:

1. Success of the cleaning project, as verified through visual inspection and/or gravimetric analysis.

2. Areas of the system found to be damaged and/or in need of repair.

Applicable Standards and Publications: The following current standards and publications of the issues currently in effect form a part of this Specification to the extent indicated by any reference thereto:

1. National Air Duct Cleaners Association (NADCA) : NADCA 1992-01;

2. Mechanical Cleaning of Non-Porous Air Conveyance System Components 1992;

3. National Air Duct Cleaners Association (NADCA): Understanding Microbial Contamination in HVAC Systems, 1996;

4. National Air Duct Cleaners Association (NADCA): Introduction to HVAC System Cleaning Services, 1995;

5. National Air Duct Cleaners Association (NADCA): NADCA Standard 05 Requirements for the Installation of Service Openings in HVAC Systems, 1997;

6. Underwriters Laboratories (UL): UL Standard 181;

7. American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE): Standard 62-89, Ventilation for Acceptable Indoor Air Quality;

8. Environmental Protection Agency (EPA): Building Air Quality December, 1991;

Section 23 00 00 Page 14

9. Sheet Metal and Air Conditioning Contractors National Association (SMACNA): HVAC Duct Construction Standards - Metal and Flexible, 1985.

(AM #6)

3.5 OPERATION AND MAINTENANCE TRAINING

The Contractor shall conduct a training course for the members of the operating staff as designated by the Contracting Officer. The training period shall consist of a total of eight hours of normal working time and shall start after all work specified herein is functionally completed and the Performance Tests have been approved. The field instruction shall cover all of the items contained in the Operation and Maintenance Manuals as well as demonstrations of routine maintenance operations. Notify the Contracting Officer at least 14 days prior to the date of proposed conduct of the training course.

-- End of Section --