564-19-101 Specification Section 22 12 16 Revised.pdf

New Water Storage Facility Veterans Healthcare System of the Ozarks

564-19-101 09-01-21

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SECTION 22 12 16

ELEVATED, POTABLE-WATER STORAGE TANKS

PART 1 - GENERAL

1.1 DESCRIPTION

A. An elevated steel water storage tank and tower, completed, including risers, piping, drains, materials, labor, equipment, interior and exterior painting, sterilization, water level monitoring, mixing, building automation system controls and interfaces, and all accessories as required for a complete working system.

B. A complete listing of all acronyms and abbreviations are included in

Section 22 05 11, COMMON WORK RESULTS FOR PLUMBING.

c. Scope: The Contractor shall be responsible for all labor, materials and equipment necessary for the design, fabrication, construction, painting, disinfection and testing of an elevated, welded carbon steel water storage tank supported by a series of supporting columns and cross bracing. This style of tank is commonly referred to as a “Multi-

Column” Tank. Design and construction of the Elevated Tank shall conform to all requirements of AWWA D100 Standard for Welded Carbon

Steel Tanks for Water Storage, except as modified by the requirements of these contract documents, and the American Iron and Steel (AIS) provisions apply to this project.

D. Qualification of Manufacturer

a. The design and construction of the “Multi-Column” elevated water storage tank shall only be undertaken by a Contractor with a minimum of five years experience with elevated tank construction. The Contractor must be able to demonstrate experience through the design and construction of at least five “Multi-Column” elevated water tanks. The

Contractor shall not subcontract the design or erection of the steel tank and supporting tower.

b. As providing a safe work environment is critical for this project, other contractors, and the community, to be approved to bid on this project, given the complexity, and risk associated with the work, all tank contractors are required to have an Experience Modification Rate

(EMR) below 0.75 and a Total Recordable Incident Rate (TRIR) below 2.5 for the last three (3) years. Bidders are required to verify the above requirement by providing with their proposal a statement from their

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22 12 16 - 2 insurance carrier confirming the EMR requirement, and their last three

(3) years of OSHA 300 Logs to confirm the TRIR requirement.

E. Tank Details: The elevated tank shall be all-welded construction of the most economical design. All members of structural steel or of reinforced concrete shall be designed to safely withstand the maximum stresses to which they may be subjected during erection and operation.

a. The minimum operating capacity of the storage tank will be 600,000

US gallons.

b. The capacity of the tank, low water level to high water level, shall be contained within a maximum operating head range of 36 feet +/-

2.5 feet.

c. The height of the tank, top of foundation to high water level, shall be 120 feet.

d. Top of foundation elevation shall be 1,455.3 feet +/- above Mean

Sea Level (MSL)

e. The existing ground elevation is 1454.3 feet +/- above MSL

f. The finished ground elevation shall be 1454.3 feet +/- above MSL

G. The site plan drawings clearly indicate the approximate location of all known electrical lines, other utilities, and piping. The Contractor is responsible for coordinating with the VA when relocating or de-energizing any electrical or utility lines that may interfere with the safe construction of the foundations or other structure(s). In general, no overhead lines, or supports, shall pass or be located within 50 feet of any part of the structure or the footprint of the tank, except where otherwise shown in the drawings. A minimum vertical clearance of 15 feet shall be provided along any access routes.

1.2 RELATED WORK

A. Section 01 00 00, GENERAL REQUIREMENTS.

B. Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES.

D. Section 01 91 00, GENERAL COMMISSIONING REQUIREMENTS.

1.3 APPLICABLE PUBLICATIONS & SPECIFICATIONS

A. The publications listed below form a part of this specification to the extent referenced. American Iron and Steel (AIS) provisions apply to this project. The publications are referenced in the text by the basic designation only. Work on the water storage tank shall fully conform to the requirements of the latest published editions of the following

Standard Specifications:

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B. American Institute of Steel Construction (AISC):

325-2011................Steel Construction Manual, 14th Edition

360-2010................Specification for Structural Steel Buildings

C. ANSI (American National Standards Institute)

ANSI/ASC 29.4...........Exhaust Systems Abrasive Blasting Operations

– Ventilation and Safe Practice

ANSI/NSF Standard 61....Drinking Water Components

ANSI/NSF/CAN Std. 600...Drinking Water Components

D. American Society of Civil Engineers (ASCE):

ASCE/SEI 7-2010.........Minimum Design Loads for Buildings and Other

Structures

E. American Society of Mechanical Engineers (ASME):

A112.6.3-2001 (R2007)...Floor and Trench Drains

B16.1–2010..............Gray Iron Pipe Flanges and Flanged Fittings:

Classes 25, 125, 250

B16.34-2013.............Valves Flanged, Threaded and Welding End

ASME Boiler and Pressure Code -

BPVC Section IX-2015....Welding, Brazing, and Fusing Qualifications

F. American Society for Testing and Materials (ASTM):

A36/A36M-2014...........Standard Specification for Carbon Structural

Steel

A53/A53M-2012...........Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and

Seamless

A123/A123M-2013.........Standard Specification for Zinc (Hot-Dip

Galvanized) Coatings on Iron and Steel Products

A153/A153M-2009.........Standard Specification for Zinc Coating (Hot-

Dip) on Iron and Steel Hardware

A234/A234M-2014.........Standard Specification for Piping Fittings of

Wrought Carbon Steel and Alloy Steel For

Moderate and High Temperature Service

D520....................Standard Specification for Zinc Dust Pigment

D2200 ..................Standard Methods of Evaluating Degree of

Rusting on Painted Surfaces

D4417...................Standard Test Methods for Field Measurement of

Surface Profile of Blast Cleaned Steel

E337....................Standard Practice Test Method for Measuring

Humidity with a Psychrometer

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G. American Water Works Associations (AWWA):

B300-2018...............Hypochlorites

B301-2018...............Liquid Chlorine

C110-2012...............Ductile-Iron and Gray-Iron Fittings

C115-2020...............Flanged Ductile-Iron Pipe with Ductile-Iron or

Gray-Iron Threaded Flanges

C151/A21.51-2017........Ductile-Iron Pipe, Centrifugally Cast

C652-2011...............Disinfection of Water Storage Facilities

D100-2021...............Welded Carbon Steel Tanks for Water Storage

D102-2014...............Coating and Painting Steel Water-Storage Tanks

H. American Welding Society (AWS):

D1.1/D1.1M-2010.........Structural Welding Code-Steel

D1.3/D1.3M-2008.........Structural Welding Code-Sheet Steel

D1.4/D1.4M-2011.........Structural Welding Code-Reinforcing Steel

I. International Code Council (ICC)

IBC-2021................International Building Code

IPC-2023................International Plumbing Code

J. National Fire Protection Association (NFPA):

22-2013 ................Standard for Water Tanks for Private Fire

Protection

25-2014.................Standard for the Inspection, Testing, and

Maintenance of Water-Based Fire Protection

Systems

70-2014.................National Electric Code

K. NATIONAL STANDARDS FOUNDATION)INTERNATIONAL (NSF):

61 - Materials in contact with Potable Water.

61-2014a................Drinking Water System Components–Health Effects

372-2011................Drinking Water System Components–Lead Content

L. Department of Labor:

29 CFR PART 1910........Occupational Safety and Health Standards

M. Department of Veterans Affairs:

H-18-8-2013.............Seismic Design Handbook

N. Steel Structures Painting Council Manual

Volume 1 - Good Painting Practice

Volume 2 - Systems and Specifications.

O. American Concrete Institute (ACI) 318 - Building Code Requirements for

Reinforced Concrete

P. ACI 301 –Specifications for Structural Concrete

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Q. Consumer Product Safety Act, Part 1303

R. NACE Publication TPC2...Coatings and Linings for Immersion Service:

Chapter 1 Safety, Chapter Surface Preparation, Chapter 3 Curing, and

Chapter 4 Inspection

Standard SP0178...Standard Recommended Practice – Fabrication Details, Surface Finish Requirements and Proper Design Considerations for Tanks and Vessels to be Lined for Immersion Service

Standard SP0188...Standard Recommended Practice – Discontinuity

(Holiday) Testing of Protective Coatings

Standard RP0287...Field Measurement of Surface Profile of Abrasive

Blast-Cleaned Steel Surfaces Using a Replica Tape

Standard RP0288...Standard Recommended Practice, Inspection of Linings on Steel and Concrete

S. OSHA (Occupational Safety & Health Administration)

1915.35...Standards – 29 CFR – Painting

T. SSPC (Society for Protective Coatings)

SP2 Hand Tool Cleaning

SP3 Power Tool Cleaning

SP11 Power Tool Cleaning to Bare Metal

PA-1 Shop, Field and Maintenance Painting

PA-2 Measurement of Dry Film Thickness with Magnetic Gages

PA-3 Guide to Safety in Paint Application

Guide 12 Guide for Illumination of Industrial Painting Project

VIS 1-89 Pictorial Surface Preparation Standards for Painting Steel

Surfaces

Paint Spec 36 Two Component Weatherable Aliphatic Polyurethane

Topcoat, Performance-Based

SSPC/NACE Joint Standards

SSPC-SP5/NACE 1 White Metal Blast Cleaning

SSPC-SP6/NACE 3 Commercial Blast Cleaning

SSPC-SP7/NACE 4 Brush-Off Blast Cleaning

SSPC-SP10/NACE 2 Near-White Metal Blast Cleaning

U. National Association of Pipe Fabricators (NAPF)

NAPF 500-03 Surface Preparation Standard for Ductile Iron Pipe and

Fittings In Exposed Locations Receiving Special External Coatings and/or Special Internal Linings.

V. Veterans Affairs Color Specifications for VA Seal and VA Signage Design

Guide.

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a. White VA Pantone Matching System (PMS)# N/A, Matthews # MP32071, AZKO Nobel # SIGNM32071.

b. Red PMS# 200, Matthews # MP09251, AZKO Nobel # SIGNM09251.

1.4 SUBMITTALS

A. Submittals, including number of required copies, shall be submitted in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND

SAMPLES.

B. Information and material submitted under this section shall be marked

“SUBMITTED UNDER SECTION 22 12 16, FACILITY ELEVATED, POTABLE-WATER

STORAGE TANKS”, with applicable paragraph identification.

C. Manufacturer's Literature and Data including: Full item description and optional features and accessories. Include dimensions, weights, materials, applications, standard compliance, model numbers, size, and capacity.

1. Piping.

2. Valves, bends, elbows, fittings, connections, ductile iron-to-carbon steel couplings, etc.

3. Floor Drain.

4. Steel Tank and Accessories.

5. Water Level Monitoring, Pump Controls, and Alarm System.

6. OSHA approved climbing equipment for maintenance personnel.

7. Tank Heating Equipment, if required.

8. Lightning Protection.

9. Paint colors and proposed exterior paint scheme (white with red trim, per VHSO direction and VA Color Specifications for VA Seal and

VA Signage Design Guide). The VA logo will be added if directed by the VA. Colors:

a. White VA Pantone Matching System (PMS)# N/A, Matthews # MP32071, AZKO Nobel # SIGNM32071.

b. Red PMS# 200, Matthews # MP09251, AZKO Nobel # SIGNM09251.

10. Mixing System.

D. Calculations and completely detailed erection procedure with shop drawings.

E. Foundation, footings and calculation, designed and stamped by a professional Structural Engineer.

F. Power, signal, building automation system, and control wiring.

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G. Plans, sections, details, elevations and attachment to other work. The

Contractor shall provide engineering drawings and design calculations for the elevated steel tank and the foundation. Drawings shall show the size and location of all structural components and the foundations along with reinforcement details, the required strength and grade of all materials, and the size and arrangement of principle piping and equipment. The drawings and calculations shall bear the certification of a professional Engineer licensed in the State of Arkansas. The design coefficients and resultant loads for snow, wind and seismic forces, and the methods of analysis shall be documented.

H. Completed System Readiness Checklist provided by the Commissioning

Agent and completed by the contractor, signed by a qualified technician and dated on the date of completion.

I. Submit training plans and instructor qualifications in accordance with the requirements of Section 22 08 00, COMMISSIONING OF PLUMBING

SYSTEMS.

J. No bid will be considered unless this information is provided with the proposal:

a. A list of five “Multi-Column” elevated tanks constructed within the last five years, including the name of the Owner, tank capacity, and the Consulting Engineer.

K. The successful contractor shall provide this information after contract award and prior to commencement of fabrication and contruction:

a. A preliminary drawing of the tank showing major dimensions and plate thickness upon which the bid is based, the high and low water levels and the dimensions of the supporting tower.

b. A foundation design drawing showing preliminary dimensions and approximate quantities of concrete and reinforcing steel.

1.5 QUALITY ASSURANCE

A. Criteria:

1. Manufacturer regularly and presently manufactures the item submitted as one of their principal products.

2. Installer, or supplier of a service, has technical qualifications, experience, trained personnel, and facilities to perform the specified work.

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3. Submit a list of five completed projects of similar type and size with references with current position, address, telephone number, and e-mail.

B. System Requirements: AWWA D100 for steel tanks plus the following:

1. Steel Tower Supporting Elevated Water Tank Design Loads:

a. Weight of Tank and Water.

b. Wind Load.

c. Seismic Load.

d. Combined Loads: Design for the worst case:

1) Gravity and wind.

2) Gravity and seismic.

e. Snow Load.

f. Design Code: AISC 360.

2. IBC and local building codes.

C. Tank welding qualification procedures and personnel shall be in accordance with AWS D1.1, AWS D1.3 and AWS D1.4.

D. Pipe welding qualification procedures and personnel shall be in accordance with ASME BPVC Section IX.

E. Electrical components, devices and accessories shall be listed and labeled as defined in NFPA 70, Article 100, by a testing agency acceptable to authorities having jurisdiction, and marked for intended use.

F. Bio-Based Materials: For products designated by the USDA’s Bio-

Preferred Program, provide products that meet or exceed USDA recommendations for bio-based content, so long as products meet all performance requirements in this specifications section. For more information regarding the product categories covered by the Bio-

Preferred Program, visit http://www.biopreferred.gov.

G. Painting

1. Submit and obtain VA approval on the proposed paint colors and scheme (white with red trim, per VHSO direction and VA Color

Specifications for VA Seal and VA Signage Design Guide) for VA prior to painting the exterior of the tank and associated components.

2. Surface Preparation: Surface preparation will be based upon comparison with: "Pictorial Surface Preparation Standards for

Painting Steel Surfaces: SSPC-VIS 1-89”, ASTM Designation D2200-95, "Pictorial Surface Preparation Standards for Painting Steel

Surfaces”, ASTM D 4417-91, Method A and/or Method C “Field http://www.biopreferred.gov/

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Measurement of Surface Profile of Blast Cleaned Steel” or NACE

Standard RP0287-87 “Field Measurement of Surface Profile of Abrasive

Blast Cleaned Steel Surfaces Using a Replica Tape". In all cases the written standard shall take precedence over the visual standard.

In addition, NACE Standard SP0178-91, “Fabrication Details, Surface

Finish Requirements, and Proper Design Considerations for Tanks and

Vessels to be Lined for Immersion Service”, along with the Visual

Comparator, shall be used to verify the surface preparation of welds.

3. Application: No coating or paint shall be applied when: 1) the surrounding air temperature or the temperature of the surface to be coated or painted is below the minimum surface temperature for the products specified herein, 2) rain, snow, fog or mist is present, 3) the surface temperature is less than 5F above the dew point, 4) the air temperature is expected to drop below the minimum temperature for the products specified within six hours after application of coating. Dewpoint shall be measured by use of an instrument such as a Sling Psychrometer in conjunction with U.S. Department of Commerce

Weather Bureau Psychometric Tables. If any of the above conditions are prevalent, coating or painting shall be delayed or postponed until conditions are favorable. The day's coating or painting shall be completed in time to permit the film sufficient drying time prior to damage by atmospheric conditions.

4. Coating Thickness: Thickness of coatings and paint shall be measured checked according to the procedures outlined in SSPC-PA 2

“Measurement of Dry Film Thickness with Magnetic Gages.” Use of an instrument such as a Tooke Gauge, precision groove grinder, etc. is permitted if a destructive test is deemed necessary by the VA and the total DFT is less than 50 mils.

5. Holiday (Pinhole) Testing: The integrity of interior coated surfaces shall be tested for holidays in accordance with NACE

Standard SP0188. For dry films less than 20 mils, a non-destructive holiday detector shall not exceed 67.5 volts, nor shall destructive holiday detector exceed the voltage recommended by the manufacturer of the coating system. A solution of 1-ounce non-sudsing type wetting agent, such as Kodak Photo-Flo, and 1 gallon of tap water shall be used to perform the holiday testing. For coating thickness at 20 mils and greater, a high voltage Tinker & Rasor AP/W holiday

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22 12 16 - 10 tester shall be used. Contact coating manufacturer for voltage recommendations and curing parameters. All pinholes and/or holidays shall be marked and repaired in accordance with the manufacturer's printed recommendations and retested. No pinholes or other irregularities will be permitted in the final coating.

6. Inspection Devices: The contractor shall furnish, until final acceptance of coating and painting is accepted, inspection devices in good working condition for detection of holidays and measurement of dry film thickness of coating and paint. The Contractor shall also furnish U.S. Department of Commerce, National Bureau of

Standards certified thickness calibration plates and/or plastic shims, depending upon the thickness gauge used, to test the accuracy of dry film thickness gauges and certified instrumentation to test the accuracy of holiday detectors. Dry film gauges and holiday detectors shall be made available for the VA's use at all times until final acceptance of application. Holiday detection devices shall be operated in the presence of the VA.

7. Inspection: Inspection for this project shall consist of ‘hold point’ inspections. The VA, VA’s representative, or Third Party

Independent Inspector shall inspect the surface prior to abrasive blasting, after abrasive blasting but prior to application of coating materials, and between subsequent coats of material. Final inspection shall take place after all coatings are applied, but prior to placing the tank in service. Contractor will insure that sufficient rigging is in place so that the VA, VA’s representative, or Third Party Independent Inspector shall be able to conduct the required inspections.

8. Warranty Inspection: Warranty inspection shall be conducted during the eleventh month following acceptance of all coating and painting work. All defective work shall be repaired in accordance with this specification and to the satisfaction of the VA and/or the VA’s representative.

1.6 AS-BUILT DOCUMENTATION

A. Submit manufacturer’s literature and data updated to include submittal review comments and any equipment substitutions.

B. Submit operation and maintenance data updated to include submittal review comments, substitutions and construction revisions shall be in electronic version on compact disc inserted into a three ring binder.

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All aspects of system operation and maintenance procedures, including piping isometrics, wiring diagrams of all circuits, a written description of system design, control logic, and sequence of operation shall be included in the operation and maintenance manual. The operations and maintenance manual shall include troubleshooting techniques and procedures for emergency situations. Notes on all special systems or devices such as damper and door closure interlocks shall be included. A List of recommended spare parts (manufacturer, model number, and quantity) shall be furnished. Information explaining any special knowledge or tools the owner will be required to employ shall be inserted into the As-Built documentation.

C. The installing contractor shall maintain as-built drawings of each completed phase for verification; and, shall provide the complete set at the time of final systems certification testing. As-built drawings are to be provided, and a copy of them in Auto-CAD 2022 DWG file version as of 2022 provided on compact disk or DVD. Should the installing contractor engage the testing company to provide as-built or any portion thereof, it shall not be deemed a conflict of interest or breach of the ‘third party testing company’ requirement.

D. Certification documentation shall be provided to COR 10 working days prior to submitting the request for final inspection. The documentation shall include all test results, the names of individuals performing work for the testing agency on this project, detailed procedures followed for all tests, and certification that all results of tests were within limits specified.

PART 2 - PRODUCTS

2.1 MATERIALS

A. Material or equipment containing a weighted average of greater than

0.25 percent lead is prohibited in any potable water system intended for human consumption, and shall be certified in accordance with NSF 61 or NSF 372.

2.2 TANK

A. The materials, design, fabrication, erection, welding, testing and inspection of the steel tank shall be in accordance with the applicable sections of AWWA D100 except as modified in this document, NFPA 22, and

ASTM A36/A36M.

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B. The tank shall be of the type shown in the project contract drawings and supported by columns.

C. The tank shall be constructed of steel with a minimum thickness for any part of the structure shall be 3/16 inch for parts not in contact with water plus 0.01 inch for corrosion allowance, and 1/4 inch plus 0.01 inch for corrosion allowance for parts in contact with water. All portions of the tank including the roof shall be of watertight construction. Tank shall be welded throughout.

D. Environmental Loads – AWWA D100 and ASCE 7

a. Wind Load – Wind design, loads, and pressures shall be determined in accordance with ASCE 7-17, Chapter 26 and AWWA D100, Section 3.1.4.

Basic wind speed used in the Wind Pressure formula shall be determined using the mapped site location.

Basic Wind Speed (BWS) – 115 MPH (ASCE 7-17, Figure 26.5-1D, Category IV Building, Water Storage and Pumping for Fire Fighting)

b. Seismic Load – Seismic design and loads shall be determined in accordance with AWWA D100, Section 13, and ASCE 7-16 Chapter 22.

Design the tank to withstand an earthquake in the “Moderate Low” risk/hazard area as defined by the Veterans Affairs Handbook H-18-8

(although it is in the “Low” risk/hazard area, the VA has requested the tank be designed to the requirements of the “Moderate Low” risk/hazard area). In accordance with the International Building Code, the water storage tank is a Risk Category IV. Conditions in the area are defined by ASCE 7-16 as:

1. MCE Spectral Response Acceleration at 0.2sec (SS) and 1sec (S1)

(ASCE 7-16, Figures 22-1 and 22-2, respectively)

SS = .175 (17.5%)

S1 = .091 (9.1%)

Longitude = 36 degrees 04' 55" North (at tank center)

Latitude = 94 degrees 09' 29" West (at tank center)

2. Maximum Considered Earthquake Geometric Mean (MCEG) PGA, %g – 8

(ASCE 7-16, Figure 22-9)

3. Long Period Transition Period (TL) - 12

(ASCE 7-16, Figure 22-14)

4. Risk Coefficient at 0.2-s Spectral Response Period, CRS – 0.91

(ASCE 7-16, Figure 22-18A)

5. Risk Coefficient at 1.0-s Spectral Response Period, CR1 – 0.87

(ASCE 7-16, Figure 22-19A)

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c. Snow Load – 5 pounds per square foot +/-. Snow design and load shall be determined in accordance with ASCE 7-16, Chapter 7 and AWWA

D100, Section 3.1.3.1.

F. The balcony and ladder loading shall be as specified in AWWA D100, furnish OSHA approved climbing equipment.

2.3 FOUNDATION

A. General:

a. The structural design of the elevated storage tank shall conform to the following design standards (latest edition) except as modified or clarified as follows:

i. Foundations – AWWA D100, ACI 318, and IBC 2012 – Building

Code Requirements for reinforced concrete.

ii. Steel Tank – AWWA D100

iii. Steel Tank Painting – AWWA D102

B. The Contractor shall be responsible for verification of soil conditions, as noted in the August 31, 2021 Geotechnical Report for the project site (to be provided separately) and installation of the foundation and footings in accordance with the design provided in the construction documents and drawings and the standards noted above. The contractor shall submit stamped and signed design calculations and drawings by a Professional Engineer licensed in the State of Arkansas for approval.

2.4 ACCESSORIES

A. General: Comply with AWWA D100. Main riser and overflow shall be schedule 40 steel, ASTM A53/A53M with schedule 40, ASTM A234/A234M, butt welded fittings. The following accessories shall be provided in accordance with these specifications. All items shall be in full conformity with the current applicable OSHA safety regulations and the operating requirements of the structure.

B. Piping:

1. Supply/Inlet Pipes and Distribution/Outlet Pipes: The vertical combined inlet pipe and outlet pipe connections to the bottom of the risers shall be the following:

a. Supply/Inlet Pipe: 8-inch standard weight schedule 40 carbon steel pipe with appropriate transition to a ductile iron base elbow of the same inside diameter. Connect the two pipes above the base elbow with an insulating coupling with insulating boot to prevent

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22 12 16 - 14 electrolytic action by isolating the ductile iron pipe and the carbon steel pipe from each other. The vertical pipe shall extend up into the riser one foot above the riser base.

b. Distribution/Outlet Pipe: 12-inch standard weight schedule 40 carbon steel pipe with appropriate transition to a ductile iron base elbow of the same inside diameter. Connect the two pipes above the base elbow with an insulating coupling with insulating boot to prevent electrolytic action by isolating the ductile iron pipe and the carbon steel pipe from each other. The vertical pipe shall extend up into the riser one foot above the riser base. Include a removable silt stop over the top of the Distribution/Outlet pipe.

2. Overflow: The overflow pipe shall be 8-inches in diameter and designed to carry the maximum design flow rate of to grade with an overflow that is visible/conspicuous before spilling into the design stormwater channel and bioswale below, as shown on the drawings. The overflow shall be provided with an insect screen and splash block. The

8-inch steel overflow pipe shall have a minimum wall thickness of 1/4”.

A suitable weir shall be provided inside the tank with the crest located at High Water Level. The overflow shall be routed from the weir to closely match the roof contour and extend down the ladder column and terminate approximately 1 to 2 feet above grade and discharge onto a concrete splash pad. The point of discharge shall have a 45 degree elbow to and be equipped with a stainless steel screen.

C. The Main/Center tank Riser shall be 48 inches in diameter.

D. Main/Center Riser: Main/Center steel riser shall be 48 inches in diameter. Inside the Main/Center Riser, the Supply/Inlet standard weight schedule 40 carbon steel pipe inside the center riser shall be 8 inches in diameter with appropriate transition from an 8-inch standard ductile iron base elbow of the same diameter and the

Distribution/Outlet standard weight schedule 40 carbon steel pipe inside the center riser shall be 12 inches in diameter with appropriate transition from an 12-inch standard ductile iron base elbow of the same diameter. Riser manhole shall be 760 mm (30 inches) minimum.

E. Rigging Lugs for future maintenance: Provide 7 mm (1/4 inch) minimum diameter holes. Lugs shall be located to access all portions of the tank and shall be capable of sustaining a load of 450 kg (992 pounds).

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F. Protection Shields: Provide each column with a circular protection shield projecting at least 600 mm (24 inches) from column. Shield on ladder column shall be 7 mm (1/4 inch) steel plate and other shields shall be 3.2 mm (1/8 inch) steel plate. Hinged trap door in ladder column shield shall swing up and left. Trap door shall have a welded-on hasp and staple, and a pin tumbler type padlock with chain welded to shield. Key padlock in COR's set.

G. Perimeter Safety Railing for Riser Opening in Tank: Provide a circular steel railing around perimeter of riser opening in bottom of tank.

Railing shall be 1050 mm (42 inches) high and constructed of four 50 mm by 50 mm by 10 mm (2 inch by 2 inch by 3/8 inch) angle uprights welded to riser compression ring or tank construction at bottom, one 50 mm by

50 mm by 10 mm (2 inch by 2 inch by 3/8 inch) circular angle top member, and two 40 mm by 7 mm (1-1/2 inch by 1/4 inch) circular bars with first bar located 200 mm (8 inches) above bottom of tank, and second bar at midpoint between first bar and top member of railing.

H. Vent: Vent shall be welded to the cover plate of the center manhole on the roof. Vent shall be tank manufacturer's standard type mushroom vent with #24x#24 insect screen. The free area of the vent shall be sized 50 percent in excess of the pump-in rate and pump-out rate. Screening for vent shall conform to Section 5.7.2 of AWWA D100. Ensure fail-safe operation in the event that screen frosts over and the bottom of the screen shall be elevated 24” to minimize rain splashing and for snow consideration in the area.

I. Ladders and Safety Devices: Ladders and safety devices shall be provided in accordance with Sections 7.4 and 7.5 of AWWA D100. Location of ladders shall be as shown on the drawings. Sections 7.4 and 7.5 of

AWWA D100 represent the minimum requirement. In addition, safety cage, rest platforms, roof ladder handrails, and other safety devices shall be provided as required by federal or local laws or regulations.

a. Ladders: Ladder side rails shall be a minimum 3/8 inch by 2 inches with a 16 inch clear spacing. Rungs shall be not less than 3/4 inch, round or square, spaced at 12 inch centers. The surface of the rungs shall be knurled, dimpled or otherwise treated to minimize slipping.

Ladders shall be secured to adjacent structures by brackets located at intervals not exceeding 10 feet. Brackets shall be of sufficient length to provide a minimum distance of 7 inches from the center of the

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22 12 16 - 16 rung to the nearest permanent object behind the ladder. Access ladders shall be provided at the following locations:

1. The tower ladder shall extend up one column from near the base connecting with the balcony. The first rung shall be located approximately 12 feet above top of foundation.

2. An outside tank ladder from the balcony to the roof hatch.

3. An inside tank ladder from the roof hatch to the inside bottom of the tank. An inside riser ladder from the base of the riser to the bottom of the tank.

b. Safety Devices: Ladders shall be equipped with a fall arrest system meeting OSHA regulations. The system shall be supplied complete with safety harnesses, locking mechanisms, and accessories for two persons.

J. Balconies: Provide a balcony a minimum of 600 mm (24 inches) wide with a standard guard railing. Provide a structural steel railing with a top rail 1050 mm (42 inches) above balcony platform with an intermediate rail halfway between. Guard rail shall be capable of withstanding a force of 888 N (200 pounds) applied in any direction. Install a steel toe board with minimum height of 100 mm (4 inches). Bottom of toe board shall be a maximum 7 mm (1/4 inch) from platform top. Extend guard rail and toe board entire length of balcony except where access openings are required. For balcony floors use diamond plates a minimum of 7 mm (1/4 inch) thick, punched, perforated, or drilled for drainage. Equip access openings in guard rail with a gate which closes automatically. Hatches through balcony floor shall be counterbalanced or otherwise arranged to open from below with padlock keyed by local VA lock shop.

K. Openings:

1. Roof Hatches: Provide two access hatches on the roof of the tank.

One hatch shall be 30 inch diameter and allow access from the roof to the interior of the tank. The hatch will be hinged and equipped with a hasp for locking. The hatch cover shall have a 2 inch downward edge.

The second hatch will be 24 inch diameter and flanged with a removable cover so constructed that an exhaust fan may be connected for ventilation during painting operations. The openings shall have a minimum 4 inch curb.

2. Tank Vent: The tank vent should be centrally located on the tank roof above the maximum weir crest elevation. The tank vent shall have an intake and relief capacity sufficiently large that excessive pressure or vacuum will not develop during maximum flow rate. The vent

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22 12 16 - 17 shall be designed, constructed and screened so as to prevent the ingress of wind driven debris, insects, birds and animals. The vent shall be designed to operate when frosted over or otherwise clogged.

The screens or relief material shall not be damaged by the occurrence and shall return automatically to operating position after the pressure or vacuum is relieved.

3. Riser Manhole: A minimum 760 mm (30 inches) minimum diameter elliptical access manhole shall be provided approximately 3 feet above the base of the wet riser. The hatch shall open outward.

L. Identification Plate: A tank identification plate shall be mounted on the tank riser pipe above the access manhole. The identification plate shall be corrosion resistant and contain the following information.

1. Tank Contractor

2. Contractor’s project or file number

3. Tank capacity

4. Height to High Water Level

5. Date erected

M. Federal Aviation Administration (FAA) Obstruction High Intensity

Lighting system

1. General: A FAA Circular AC 70/7460-1K compliant Aviation Red

Obstruction High Intensity Light shall be installed on top of the tower.

2. Aviation Red Obstruction Lights. Use steady burning lights that are operational during nighttime.

3. Monitoring System. The obstruction lighting shall include an automatic monitoring system. This monitoring system should be designed to register the malfunction of the communication status and operational status on the obstruction’s Aviation Red Light, to include a monitor

(aural and visual) through the Building Automation System and to a BAS

Operator in an adjacent building (such as Building 8, Building 9, or

Building 10) as directed occupied by the VA.

4. Standards:

a. The red obstruction lighting system is composed of a steady burning (L-810) lights, in accordance with AC 150/5345-43, FAA

Specification for Obstruction Lighting Equipment.

(1) AC 150/5345-53, Airport Lighting Certification Program, lists the manufacturers that have demonstrated compliance with the specification requirements of AC 150/5345-43.

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(2) Other manufacturers’ equipment may be used provided that equipment meets the specification requirements of AC 150/5345-43.

b. Control Device: Red obstruction lights must be operated by a satisfactory control device (e.g., photo cell, timer, etc.) adjusted so the lights will be turned on when the northern sky illuminance reaching a vertical surface falls below a level of 60 foot-candles

(645.8 lux) but before reaching a level of 35 foot-candles (367.7 lux). The control device must turn the lights off when the northern sky illuminance rises to a level of not more than 60 foot-candles

(645.8 lux). The sensing device must face the northern sky. (See AC

150/5345-43.)

N. Lightning Protection: Comply with NFPA 22. Contractor/tank supplier must provide their standard ground loop lightning protection around the elevated water storage tower foundations that are certified to comply with NFPA 22.

2.5 PIPING

A. Pipe:

1. Ductile Iron:

a. Underground: AWWA C151, working pressure 1035 kPa (150 psig), exterior bituminous coating and interior cement lining. Bio-based materials shall be utilized when possible.

b. In Pits: AWWA C115, flanged joints only, working pressure 1035 kPa (150 psig).

2. Steel (Above Ground Only): Galvanized, ASTM A53/A53M, standard weight, threaded flanges, ASME B16.1, class 125.

B. Fittings: Ductile-iron, AWWA C110.

2.6 VALVES

A. Altitude: Differential type, hydraulically operated, diaphragm-actuated iron body, bronze mounted, self-contained unit. Valve shall close when water level in tank reaches a point 150 mm (6 inches) below tank overflow.

1. Double Acting Valve: Shall remain closed until upstream pressure drops below pressure available when water is 150 mm (6 inches) below tank overflow.

B. Check: Iron body, bronze trim swing type, vertical or horizontal installation, flange connection, 1380 kPa (200 psig) WOG, Underwriters

Laboratories Inc. approved.

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C. Gate: Fed Spec WW-V-58, Type II, class 1, flanged, non-rising stem type. Valve shall turn counterclockwise to open. Furnish hand wheel for operation. Ends of valves shall suit, or be adapted to pipe furnished.

2.7 VALVE CHAMBER

A. Valve chamber shall be sufficiently large to house all control valves and fittings; and allow for unobstructed maintenance and replacement.

Pipes, valves, and fittings shall be supported on concrete blocks where necessary and as shown in the drawings/details. The valve chamber shall be constructed to provide not less than 2 inches of cover over the pipes. The valves and fittings shall extend from the riser pipe connection to a point one length of pipe outside the valve chamber walls on the main or feed line to the elevated tank. The drain line shall be carried to an outlet as indicated on the drawings. The access manhole shall be not less than 762 mm (30 inches) in diameter.

2.8 FLOOR DRAIN

A. ASME A112.6.3, Cast iron with light duty grate.

B. Bottom outlet.

2.9 HIGH AND LOW WATER LEVEL ALARM AND TANK FILL PUMP CONTROL SYSTEMS

A. Provide high and low level devices for alarm monitoring for tank water level status.

1. All water levels shall be indicated by their respective pilot lights; green for high, amber for intermediate and red for low water levels, and a buzzer for low and high water levels.

2. Buzzer and the respective pilot lights at high and low water levels shall be energized while the high or low water level pilot device is actuated.

3. Depressing a silencing button shall silence the buzzer indicating the water level and shall remain in OFF condition. The pilot light shall remain energized.

4. Resetting the pilot light shall de-energize the pilot light and release the buzzer from its sealed-off condition.

5. Provide alarming contacts to a DDC (Direct Digital Controls) remotely to the Building Automation System (BAS) operator through the Building Automation System in an adjacent building (Building 8) as directed occupied by the VA.

6. Provide controls to fill or cease filling of the tank through a DDC of the existing water tank fill pumps located in Building 10 through the BAS. Remove the high and low water level alarm and control

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22 12 16 - 20 systems from the existing water storage tower. Connect the new high and low water level alarm and control systems in the new water storage tower and to the DDC BAS, and test/commission that the new system works and is operational prior to demolishing the old water storage tower.

2.10 ACTIVE TANK MIXING AND CONTROL SYSTEMS

A. Provide a suspended active tank mixing system (Ixom/Medora Gridbee GS

Series GS-9 with electric motor, or equivalent performance) meeting

NSF/ANSI 61 and NSF/ANSI 372 standards. Install per manufacturers directions for suspended configuration and in the “short circuit path” location at the midpoint between the tank supply/inlet and distribution/outlet.

B. Electrical & Signal: Provide 120 Volts, 20 Amps service with a Ground

Fault Circuit Interrupter (GFCI) circuit breaker at the associated pumphouse. This model must operate on single phase 120 Volts and 20

Amps circuit. Include 150 foot electric cord. Provide the Junction

Box & Cord Fixture (and roof mount cable fixture kit) supplied with the

GS Mixer located within arm’s reach of the hatch. Terminate conduit using flex conduit with male thread end for panel mount. Provide

Exterior Conduit and 3-Conductor Power Cable (2-Power + 1-Ground).

Include Mixer Control Panel with SCADA system (with power cord to outlet removable for conduit connection) for direct digital control through the VA Building Automation System.

C. Suspended Configuration: Install mixer at the low point of the tank near the tank floor (but not resting on the tank floor), suspended from the roof of the tank, with penetration through the steel tank roof, per manufacturer’s instructions, from the top/roof of the water storage tank. Install the roof mount cable fixture kit supplied with the GS

Mixer, per manufacturer’s instructions, located within arm’s reach of the hatch.

D. Disinfection and Decontamination: Disinfect and decontaminate per this specification and manufacturer’s instructions prior to contact with potable water.

2.11 PERFORMANCE REQUIREMENTS FOR THE CHLORINE LEVEL MONITORING, AND CONTROL

SYSTEMS

A. The chlorine level sampling, monitoring, and control system with initial samples are to be taken from to the water entering the new pump station from the new elevated water storage tank.

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B. The water is to be analyzed with a HaCh CL 17 Chlorine Analyzer.

1. If the chlorine level falls below 1 ppm, a signal is to be sent to the chlorine pump to inject chlorine into the water stream prior to the pumps.

2. The chlorine pump will be calibrated to dispense 4.5 ppm of

12.5% sodium Hypochlorite to raise the chlorine level 1 (one) ppm.

C. Include a Programmable Logic Controller (PLC) such that the feed rates are adjustable.

D. A second water sampling point is to be located on the discharge side of the pump station.

1. This sample point will measure chlorine levels and send the results to the PLC.

2. The PLC will analyze the data and adjust the chlorine pump output to maintain the chlorine residual not to exceed 2 ppm.

2.12 PAINT

A. Delivery, Storage, and Handling

1. All materials shall be brought to the jobsite in original sealed containers. They shall not be used until the VA has inspected the contents and obtained data from information on containers or label.

Materials exceeding storage life recommended by the manufacturer shall be rejected.

2. All coatings and paints shall be stored in enclosed structures to protect them from weather and excessive heat or cold. Flammable coatings and paints must be stored to conform with City, County, State and Federal safety codes for flammable coating or paint materials. At all times coatings and paints shall be protected from freezing.

B. ACCEPTABLE MANUFACTURERS

1. Materials specified are those that have been evaluated for the specific service. Products of the Tnemec Company, Inc. are listed to establish a standard of quality, to provide the lowest service cost and most sustainable solution. Equivalent materials of other manufacturer's may be submitted on written approval of the VA. As part of the proof of equality, the VA will require at the cost of the Contractor, certified test reports from a nationally known, reputable and independent testing laboratory conducting comparative tests as directed by the VA between the product specified and the requested substitution.

2. Requests for substitution shall include manufacturer's literature for each product giving name, product number, generic type, descriptive

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22 12 16 - 22 information, solids by volume, recommended dry film thickness and certified lab test reports showing results to equal the performance criteria of the products specified herein. In addition, a list of five projects shall be submitted in which each product has been used and rendered satisfactory service.

3. All requests for product substitution shall be made at least 10 days prior to the bid date.

4. Any material savings shall be passed to the owner in the form of a contract dollar reduction.

5. Manufacturer's color charts shall be submitted to the VA at least 30 days prior to coating and/or paint application. General Contractor and

Painting Contractor shall coordinate work so as to allow sufficient time (normally seven to ten days) for paint to be delivered to the job site.

B. General Requirements

1. All materials shall be lead-free as defined by the Consumer Product

Safety Act, Part 1303.

2. All zinc dust pigment contained in any zinc-rich material shall meet the requirements of ASTM D520 Type III as regards zinc content and purity.

3. All materials for the interior of the tank shall meet the requirements of ANSI/NSF Standard 61, AWWA D102-24, and ANSI/NSF/CAN

Standard 600 for potable water contact.

4. All catalyzed polyurethane products shall meet the minimum requirements of SSPC Paint Specification Number 36, Level 3 Performance

Level.

5. No products containing MOCHA shall be allowed.

C. Material Preparation

1. Mix and thin materials according to manufacturer's latest printed instructions.

2. Do not use materials beyond manufacturer's recommended shelf life.

3. Do not use mixed materials beyond manufacturer's recommended pot life.

4. Do not split kits of multi-component products.

D. Shop-Primer

1. Surface Preparation: Prepare all welds as per NACE SP0178, Designation D. Abrasive blast all surfaces as per SSPC-SP10 Near-White

Metal Blast Cleaning. A minimum angular profile of 1.5 mils as per

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ASTM D 4417, Method C or NACE Standard RP0287 is required. All surfaces must be clean dry and free of contaminants.

2. Primer: Tnemec Series 94-H2O Hydro-Zinc applied at 2.5 to 3.5 dry mils. Tnemec 41-49, 41-2 or 41-3 Thinner.

E. Tank interior Coating Systems--Wetted Areas

1. High-Build, Zinc/Polyamine Epoxy System:

a. Surface Preparation Prior to Abrasive Blast Cleaning: Weld flux and spatter shall be removed by power tool cleaning. Sharp projections shall be ground to a smooth contour. All welds shall be ground to a smooth contour as per NACE Std. SP0178, Designation D.

b. Surface Preparation: Clean all bare metal, welded areas and damaged shop primer as per SSPC-SP10 Near-White Metal Blast

Cleaning. A minimum angular profile of 1.5 mils as per ASTM D

4417, Method C or NACE Standard RP0287 is required. All surfaces must be clean dry and free of contaminants.

c. Coating System:

- Field Spot Primer: Tnemec Series 94-H2O Hydro-Zinc applied at

2.5 to 3.5 dry mils applied to all bare metal. Thin only with approved thinner, Tnemec 41-49, 41-2 or 41-3 Thinner.

- Stripe Coat: Tnemec Series N140 or N140F Pota-Pox Plus applied by brush and scrubbed into all weld seams. In addition to weld seams, all edges, corners, bolts, rivets, pits shall receive a stripe coat.

- 2nd Coat: Tnemec Series 22/FC22 Epoxoline applied at 20.0 to 30.0 dry mils.

- Total dry film thickness shall be a minimum of 22.5 mils per

Section 1.05, Paragraph D.

- For cold weather applications, Series 44-700 Urethane

Accelerator may be added to Series 94-H2O.

F. Tank Interior Coating System – Dry Areas

1. Zinc/Polyamidoamine Epoxy System:

a. Surface Preparation Prior to Abrasive Blast Cleaning: Weld flux and spatter shall be removed by power tool cleaning.

Sharp projections shall be ground to a smooth contour. All welds shall be ground to a smooth contour as per NACE Standard

SP0178, Designation D.

b. Surface Preparation: Clean all bare metal, welded areas and damaged shop primer as per SSPC-SP10 Near-White Metal Blast

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Cleaning. A minimum angular profile of 1.5 mils as per ASTM D

4417, Method C or NACE Standard RP0287 is required. All surfaces must be clean dry and free of contaminants.

c. Coating System:

- Field Spot Primer: Tnemec Series 94-H2O Hydro-Zinc applied at 2.5 to 3.5 dry mils applied to all bare metal. Thin only with approved thinner, Tnemec 41-49, 41-2 or 41-3 Thinner.

- Stripe Coat: Tnemec Series N69 or N69F-Color Hi-Build

Epoxoline II applied by brush and scrubbed into all weld seams. In addition to weld seams, all edges, corners, bolts, rivets, pits shall receive a stripe coat.

- 2nd Coat: Tnemec Series N69 or N69F-Color Hi-Build

Epoxoline II applied at 4.0 to 6.0 dry mils. Thin only with approved thinner, Tnemec 41-4 Thinner.

- 3rd Coat: Tnemec Series N69 or N69F-Color Hi-Build

Epoxoline II applied at 4.0 to 6.0 dry mils. Thin only with approved thinner, Tnemec 41-4 Thinner.

- Total dry film thickness shall be a minimum of 10.5 mils per Section 1.05, Paragraph D.

- For cold weather applications,…