ADOA_Rockin_River_Addendum_No._3_1.28.25.pdf

ADOA/AZ State Parks Rockin River State Park W&WW Infrastructure Upgrades Page 1 of 2 Addendum No. 3

ADOA/AZ State Parks

Rockin River State Park W&WW Infrastructure Upgrades - PCS-22-125

ADDENDUM NO. 3

This addendum addresses updates related to the general, civil, mechanical and electrical drawings and specifications.

In reference to the Stamped and Approved Plans and Specifications for the subject project, please note the following items, which shall be added or changed:

1. New well site plan and section are provided on sheets M.3.0, M3.3 and M12.0 in Exhibit “A”.

2. Demolition of existing equipment, trees and concrete around the maintenance shop is shown on sheet D1.0 in Exhibit “A”. See sheet M2.0 in Exhibit “A”. for site plan including 3” compacted ABC to extents shown.

3. All sewer piping will be 4” instead of 6”. See sheets M5.0, M6.0, and M7.0.

4. Specification for 40,000 gallon welded steel storage tank is included in Exhibit “B”.

5. See updated Bid Schedule in Exhibit “C”.

APPROVED PLANS

ITEM NO. 1: REPLACE Drawings D1.0, M2.0, M3.0, M3.3, M5.0, M6.0, M7.0, and M12.0 with NEW Drawings D1.0, M2.0, M3.0, M3.3, M5.0, M6.0, M7.0, and M12.0 attached in Exhibit “A”.

LIST OF ATTACHMENTS:

EXHIBIT “A” (9 pages)

• Contract Drawings D1.0, M2.0, M3.0, M3.3, M5.0, M6.0, M7.0, and M12.0 attached in Exhibit “A”.

EXHIBIT “B” (14 pages)

• Specification Section 13207.

Rockin River State Park W&WW Infrastructure Upgrades Page 2 of 2 Addendum No. 3

EXHIBIT “C” (3 pages)

• IFB ATT B Bid Schedule - Rockin River 1.30.25

Rockin River State Park W&WW Infrastructure Upgrades Addendum No. 3 Exhibit A

ADOA/AZ STATE PARKS

ROCKIN RIVER STATE PARK W&WW INFRASTRUCTURE UPGRADES

ADDENDUM NO. 3

EXHIBIT A

EXHIBIT A (9 total pages, including this sheet)

• Contract Drawings D1.0, M2.0, M3.0, M3.3, M5.0, M6.0, M7.0, and M12.0.

Environmental Engineers, LLC 15845 South 46th Street, Suite 144 Phoenix, Arizona 85048 Phone: (480) 283 - 8991 Fax: (480) 283 - 0082

194922 Approved PCS

Environmental Engineers, LLC 15845 South 46th Street, Suite 144 Phoenix, Arizona 85048 Phone: (480) 283 - 8991 Fax: (480) 283 - 0082

Environmental Engineers, LLC 15845 South 46th Street, Suite 144 Phoenix, Arizona 85048 Phone: (480) 283 - 8991 Fax: (480) 283 - 0082

Environmental Engineers, LLC 15845 South 46th Street, Suite 144 Phoenix, Arizona 85048 Phone: (480) 283 - 8991 Fax: (480) 283 - 0082

Environmental Engineers, LLC 15845 South 46th Street, Suite 144 Phoenix, Arizona 85048 Phone: (480) 283 - 8991 Fax: (480) 283 - 0082

Environmental Engineers, LLC 15845 South 46th Street, Suite 144 Phoenix, Arizona 85048 Phone: (480) 283 - 8991 Fax: (480) 283 - 0082

Environmental Engineers, LLC 15845 South 46th Street, Suite 144 Phoenix, Arizona 85048 Phone: (480) 283 - 8991 Fax: (480) 283 - 0082

Environmental Engineers, LLC 15845 South 46th Street, Suite 144 Phoenix, Arizona 85048 Phone: (480) 283 - 8991 Fax: (480) 283 - 0082

Addendum No. 3 Exhibit B

ADOA/AZ STATE PARKS

ROCKIN RIVER STATE PARK W&WW INFRASTRUCTURE UPGRADES

ADDENDUM NO. 3

EXHIBIT B

EXHIBIT B (14 total pages, including this sheet)

• Specification Section 13207

Rockin River State Park Water and Wastewater Infrastructure Upgrades Welded Steel Storage Tank Section 13207-1

SECTION 13207

WELDED STEEL STORAGE TANK

PART 1 - GENERAL

1.1 DESCRIPTION

A. Scope:

1. CONTRACTOR shall provide all labor, materials, equipment and incidentals as shown on the Drawings, specified or required to design, fabricate, deliver, erect, test, paint and disinfect one 40,000 gallon steel storage tank (hereinafter "tank") of welded construction, including accessories.

B. Related Sections: CONTRACTOR shall coordinate the requirements of the Work in this

Section along with the requirements of the Sections listed below which includes, but is not necessarily limited to, Work that is directly related to this Section.

1. Division 3, Concrete.

2. Section 13110, Cathodic Protection System.

3. Division 15, Mechanical.

4. Division 16, Electrical.

1.2 QUALITY ASSURANCE

A. CONTRACTOR'S or Tank Sub-Contractor's Qualifications:

1. Manufacturer shall have a minimum of five years experience of producing substantially similar equipment and shall be able to show evidence of at least five installations in satisfactory operation for at least five years.

2. CONTRACTOR or tank Sub-Contractor shall have a full-time Registered Professional Engineer having not less than five years experience in the design and field construction of welded steel storage tanks, who will be in responsible engineering charge of the Work associated with the welded steel storage tank specified herein. All detailed tank drawings and design calculations shall be signed and sealed by a Registered Professional Engineer in the State of Arizona.

B. Design and Fabrication Criteria:

1. Except as otherwise shown on the Drawings or specified, all design, materials, joints, workmanship and all other aspects of the tank design and fabrication shall conform to AWWA D100.

2. Calculate earthquake loads for Zone 2B in accordance with AWWA D100.

C. Testing Agency:

1. General: Testing of materials and field welds for compliance with technical requirements of the Specifications shall be the duty of a testing laboratory provided by CONTRACTOR as described in Section 01410.

2. Testing Services:

a. Test CONTRACTOR'S proposed materials in the laboratory and/or field for compliance with the Specifications, as described in Section 01410.

Welded Steel Storage Tank Section 13207-2

b. Perform field radiograph tests to assure that the proper quality of field welding has been obtained.

c. Report all test results to the ENGINEER and CONTRACTOR.

3. Responsibilities and Duties of CONTRACTOR: The use of testing services shall in no way relieve CONTRACTOR of his responsibility to furnish materials and construction in full compliance with the Contract Documents.

a. Furnish labor as is necessary to obtain and handle samples at the Project or at other sources of material.

b. Advise the testing agency sufficiently in advance of operations to allow for completion of quality tests and for the assignment of personnel.

D. Reference Standards: Comply with applicable provisions and recommendations of the following, except as otherwise shown or specified.

1. ASTM D 1751, Specification for Preformed Expansion Joint Filler for Concrete

Paving and Structural Construction (Nonextruding and Resilient Bituminous Types).

2. AWWA D100, Standard for Welded Steel Tanks for Water Storage.

3. AWWA D102, Standard for Painting Steel Water-Storage Tanks.

4. AWWA C652, Standard for Disinfection of Water Storage Facilities.

5. Federal Specification TT-P-86, Standard for Paint, Red LeadBase, Ready Mixed.

6. SSPC-PA1, Steel Structures Painting Counsel Standard for Shop, Field and

Maintenance Painting.

7. SSPC-SP6, Steel Structures Painting Counsel Standard for Commercial Blast

Cleaning.

8. SSPC-SP10, Steel Structures Painting Counsel Standard for Near-White Blast

Cleaning.

9. SSPC-Vis 1, Steel Structures Painting Counsel Pictorial Surface Preparation

Standards for Painting Steel Surfaces.

1.3 SUBMITTALS

A. Shop Drawings:

1. Submit for approval the following:

a. Copies of detailed tank drawings. Drawings shall include all dimensions, sizes, plate thicknesses, anchorage, piping details, roof, wall and floor detail, sealant and materials specifications and details of all required accessories. Drawings shall show interior and exterior surface areas of the tank and shall include details of all required accessories. Provide structural design calculations and details for the storage tank ring wall foundation and column foundations. Use welding symbols recommended by American Welding Society. All detailed tank drawings and design calculations shall be signed and sealed by a Registered Professional Engineer in the State of Arizona. Fabrication shall not be started until drawings are approved.

b. Name of manufacturer of paint system to be used on tank and paint chips.

Color photographs, 8-1/2-inches by 11-inches, of similar tanks showing range of exterior colors available shall be provided if requested by ENGINEER.

c. Descriptions and drawings of premanufactured pipe supports, ladders, safety cage, safety railing, ladder safety device, external water level gage, cane fiber filler and sealant.

Welded Steel Storage Tank Section 13207-3

d. Provide the name and experience record of the tank contractor or sub-contractor.

B. Manufacturer's Design Computations:

1. CONTRACTOR shall submit for record:

a. Three copies of manufacturer's design computations signed and sealed by a

Registered Professional Engineer, who may be an employee of the manufacturer. The state of registration, registration number and name on the seal shall be clearly legible.

C. Test Reports:

1. Furnish, in duplicate, certified copies of test results from radiographs and inspections of test segments.

D. Certificates:

1. Where CONTRACTOR chooses to design, fabricate and erect tank in accordance with requirements of Section 14 of AWWA D 100, submit required certificate of compliance to ENGINEER.

2. Prior to purchasing paint and paint products, submit to ENGINEER a certification from paint manufacturer stating that the quantity of each component of each paint system to be purchased is sufficient to properly coat all surfaces. Such certification shall be based on surface areas furnished by CONTRACTOR to paint manufacturer and ENGINEER.

E. Record Drawings:

1. Immediately upon completion of the Work, submit Record Drawings showing actual in-place installation of the Work specified in this Section. Record Drawings shall show locations of all radiographs and test segments.

PART 2 - PRODUCTS

2.1 TANK

A. Size:

1. Inside Diameter: 22-feet, 0-inches.

2. Nominal Capacity: 40,000 gallons.

3. Operating Water Level for 40,000 gallon capacity (1 foot off floor to overflow weir): 14-feet, 2-inches.

3. Maximum nominal overall height of straight shell: 16-feet.

B. Roof Type:

1. Column supported conical roof. No horizontal structural member shall project below the water line in the interior of tank.

C. Bottom Type:

1. Essentially Flat. A slope of 1-inch vertical to ten feet horizontal shall be provided upward towards center of tank.

Welded Steel Storage Tank Section 13207-4

D. Minimum Steel Thickness:

1. The minimum thickness of any part of tank structure, except floor plates, shall be the larger of the following:

a. 1/16-inch greater than the minimum values specified in Section 3.10 of

AWWA D 100.

b. 1/16-inch greater than the values determined from design criteria specified in

Paragraph 1.2.B above.

2. Floor plates shall be minimum 5/16-inch thick.

3. Roof plates shall be minimum 3/16-inch thick.

2.2 ACCESSORIES

A. Shell Manholes:

1. Install in bottom ring of tank at locations selected by ENGINEER two (2) circular manholes with cover hinged to shell.

2. Manholes shall be 30-inches in diameter.

B. Piping Connections:

1. Provide inflow, outflow and drain piping connections as shown. Pipe shall conform to requirements of Division 15, Mechanical.

C. Overflow:

1. Provide a weir and a weir box with a capacity of not less than 250 gpm. Length of weir shall be such that the head required to pass specified capacity over lip of weir will not result in an uplift force on tank roof. In no case, shall water level rise exceed 6-inches over lip of weir. Overflow box shall be provided with suitable hinged cover and a hasp to permit locking.

2. Provide a steel overflow pipe, of the size shown on the Drawings, with welded or flanged connections. Attach pipe to tank shell with suitable brackets spaced at proper intervals. Pipe shall extend from the weir box to approximately the base of the tank, which includes an air gap as shown on the drawings. Pipe shall conform to requirements of Division 15, Mechanical, except that it shall be unlined.

D. Ladders:

1. Provide an outside vertical steel ladder with side bars not less than 2 by 3/8-inches, with a spacing between side rails not less than 18-inches, and rungs not less than 3/4-inch square, spaced 12-inches apart on center. Ladder shall be located as shown on the Drawings. A safety cage constructed of steel shall be provided for the outside ladder. The cage shall extend from eight feet above the base of the ladder to a minimum of 42-inches above the top of the tank. The bottom of the cage shall be flared 4-inches. The cage shall extend not less than 27-inches, nor more than 28-inches, from the centerline of the rungs of the ladder. The cage shall not be less than 27-inches in width. The inside shall be clear of projections. Maximum spacing between vertical cage bars shall be approximately 9-1/2-inches center to center.

2. Unless otherwise shown on the Drawings, outside vertical and roof ladders shall be located adjacent to weir box and roof hatches for ease of access and inspection of tank.

3. Provide two inside vertical steel ladders from the tank bottom to the access hatches.

The ladders shall be the same as that specified for the outside ladder, with the exception that the ladder shall be steel painted with same system as tank interior.

Welded Steel Storage Tank Section 13207-5

4. Attach the ladders to the tank shell and roof with suitable brackets spaced at proper intervals.

5. Safety railing shall be installed on the tank roof prior to painting. Toe plates shall be welded to the roof in accordance with the detail on the Drawings.

6. Materials shall conform to AWWA D 100.

E. Ladder Safety Device:

1. Provide a fall prevention system in the following locations:

a. Vertical exterior ladder.

b. Roof ladder for slopes 5 in 12 or greater.

2. Fall prevention system shall consist of a safety belt, which snaps to a safety sleeve that slides on a Type 304 stainless steel carrier rail. The carrier rail system shall be Saf-T-Climb as manufactured by Air Space Devices, Inc., Paramount, California.

Furnish two safety belts. Furnish two safety sleeves each for the vertical ladder and the roof ladder. Carrier rail shall be securely attached to ladders. Carrier rail for vertical ladder shall extend above roof and shall be arranged to permit climber to land on roof without unsnapping his safety belt. Include provisions to secure a safety sleeve to carrier rail at top of the vertical ladder so that it will not slide down rail when safety belt is unsnapped.

F. Roof Openings:

1. Provide one roof door above high water level and adjacent to weir box.

2. Provide one ventilation hatch near centerline of tank.

3. Roof door and ventilation hatch shall conform to requirements of AWWA D 100, except that roof door shall be not less than 42-inches square and ventilation hatch shall be not less than 36-inches in diameter. Cover for each opening shall be arranged to provide an insect-tight closure. Cover for ventilation hatch shall also be furnished with hasp to permit locking, and with stainless steel chain to secure cover, after removal, to roof or to neck of hatch.

G. Finial and Vent:

1. Furnish tank with a suitable finial and a vent located at center of roof. Vent shall have capacity sufficient to pass 700-cubic feet per minute of air without developing dangerous negative or positive pressure in tank. Tank vent and finial may be combined. Vent shall be designed and constructed to exclude birds and insects and to provide anchorage for painter's rigging. Overflow pipe shall not be considered a tank vent.

I. Weir Box:

1. The tank shall have one internal weir box having a combined capacity of not less than 250 gpm. The combined length of weir shall be such that the head required to pass the specified capacity over the lip of the weir will not result in an uplift force on the tank roof. In no case shall the water level rise exceed 6-inches over the lip of the weir. Weir shall be braced and supported, as required.

J. Roof Hatches:

1. Two (2) hatches not less than 36-inches by 36-inches shall be located on the roof of the tank; one adjacent to the level indicator and ladder and one approximately diagonally opposite at the tank perimeter. The hatches shall be equipped with

Welded Steel Storage Tank Section 13207-6 suitable hinges and a hasp to permit locking. The opening shall have a curb at least 4-inches high. The cover shall be arranged to provide an insect tight closure and shall overlap the curb at least 2-inches.

K. Roof Openings:

1. As indicated on the Drawings, two (2) couplings shall be provided in the roof. The top of the coupling shall be set level. The couplings shall accept the liquid level gauge system. The openings of the couplings shall be coordinated by the tank manufacturer and level indicator vendor.

2. A 6-inch flanged opening shall be installed on the roof as indicated on the Drawings. The opening is to receive an ultrasonic level transducer.

3. Provide cathodic protection handholes in accordance with Paragraph 2.2.0. of this Section.

L. External Water Level Gage:

1. An external water level gage shall be provided. The gage shall be a guided float type indicator complete with all necessary piping, guides, float, gage board, brackets, wire and all appurtenances required for a complete and workable installation. The unit shall have the interior float travel the entire height of tank.

The exterior board shall extend over top half of tank height and the indicator shall travel 6-inches for every foot of water elevation change. The unit shall be Varec Figure No. 6700, modified, liquid level indicator with half travel gageboard, or equal.

M. Flush Type Cleanout:

1. A flush type cleanout shall be installed on the tank as shown on the Drawings.

Exterior bolts shall be spot welded as directed by the tank manufacturer.

N. Cathodic Protection System:

1. Dimension for the Cathodic Protection System locations shall be coordinated by CONTRACTOR with the cathodic protection system supplier.

2. Conduit straps shall be welded to the roof and shell of tank. Locations and site shall be coordinated by CONTRACTOR with the cathodic protection system supplier.

2.3 CANE FIBER FILLER

A. Cane fiber filler shall conform to ASTM D 1751, approximately 1/2-inch thick. The cane fiber filler shall be installed below the bottom platesas approved by the tank manufacturer.

2.4 POLYSULFIDE SEALANT

A. Polysulfide sealant shall be installed on all surfaces internal to the tank as recommended by the manufacturer.

B. Product and Manufacturer: Provide one of the following:

1. Sonnolastic Two-Part, as manufactured by Sonneborn Division of Contech, Incorporated.

2. Lasto-Meric by Tremco.

Welded Steel Storage Tank Section 13207-7

3. Or equal.

2.5 PAINT

A. General:

1. All paint and paint products used for each system shall be the product of a single paint manufacturer. All materials shall be brought to job site in original sealed, labeled and dated containers of paint manufacturer, and shall be subject to inspection by OWNER on the site.

B. Manufacturer:

1. Paint systems, as specified herein, are designated solely as a "standard of quality."

An approved equivalent may be used. Equivalents shall be a standard, regularly produced product of a manufacturer, submitted for approval on the basis of manufacturer's applicable published literature that states generic type, instructions for use, solids by volume, and application rates and chemical components of vehicles and solids. Should proposed equivalent manufacturer's literature require a higher degree of surface preparation or a greater film thickness than specified herein, that degree of surface preparation and film thickness shall apply.

C. Paint Systems:

1. Surface preparation for the interior and exterior tank surfaces shall conform to the requirements of Section 09900, Painting.

2. Interior Tank Surfaces:

a. Coat all interior tank surfaces, including interior of overflow weir box, underside of roof doors and hatches, and exterior surfaces of all pipe within tank, with three coats (interior) and two coats (exterior), as specified below, of a two component, polyamide epoxy resin. Coating shall be approved by NSF for use on interior potable water tanks in public water supply systems.

b. Tank vertical shell surfaces, roof surfaces below the normal water line of the tank and roof supporting columns, where used, shall receive three coats consisting of one prime coat, one intermediate coat and one finish coat. All other surfaces shall receive three coats consisting of one prime coat, one intermediate coat and one finish coat.

c. Paint system shall be Pota-Pox, as manufactured by Tnemec, or equal.

1) Prime coat shall be Pota-Pox Primer.

2) Intermediate coat shall be Pota-Pox.

3) Finish coat shall be Pota-Pox.

3. Exterior Tank Surfaces:

a. All exterior tank surfaces shall be coated in accordance with AWWA

Specification D 102, Outside Paint System No. 1, System 0-1-S. Paint and products shall be as manufactured by Tnemec, or equal.

b. Prime coat shall be Pota-Pox Primer.

c. Finish coat shall be Series 73 Endura Shield of a color selected by OWNER.

PART 3 - EXECUTION

3.1 INSTALLATION

Welded Steel Storage Tank Section 13207-8

A. Except as otherwise shown on the Drawings or specified, tank shall be erected in accordance with the requirements of AWWA D100.

B. Install cane fiber filler between bottom plates as recommended by tank manufacturer and concrete pipe encasements.

C. Pipe Connections:

1. Connections between tank bottom and all piping shall be made by CONTRACTOR.

Method of connection shall be approved by ENGINEER and, when completed, shall provide a completely watertight joint.

2. Where approved method of connecting pipes to tank bottom requires welding, CONTRACTOR shall use caution during welding operation to prevent damage to pipe cement-mortar lining. Any damage that may result shall be repaired by CONTRACTOR in a manner approved by ENGINEER.

3. After connection is made to tank bottom, lip of drain pipe shall be ground flush with bottom of tank.

4. Piping installation shall conform to applicable requirements of Division 15, Mechanical.

3.2 FIELD QUALITY CONTROL

A. Qualifications of Welders and Welding Procedures:

1. Welding shall be performed only by welders qualified in accordance with AWWA

D100.

2. Welding shall be performed in accordance with AWWA D100.

B. Inspection:

1. If tank is designed, fabricated and erected in accordance with standard design procedures of AWWA D100, comply with provisions of Section 11 of that Standard.

2. If tank is designed, fabricated, and erected in accordance with Section 14 of AWWA D100, comply with all required inspection procedures specified under that Appendix.

3. Welding inspections shall be the responsibility of the CONTRACTOR.

4. Inspection shall include both spot radiographs. The first welding inspection shall be made in the presence of OWNER, and at such other times as he may require.

OWNER shall designate locations where spot radiographs are to be made.

5. CONTRACTOR shall provide and operate the necessary equipment spot radiographs required by the above specification. CONTRACTOR shall remove, prepare and have spot radiographs as OWNER may require, in accordance with Section 11 of AWWA Standard D100. Cost of taking spot radiographs shall be paid for by CONTRACTOR.

C. Testing and Repair:

1. Bottom Plates:

a. After tank has been completely erected, bottom welds shall be tested for leakage by covering weld seams with soap suds and applying a partial vacuum of at least two psi by means of a vacuum box with a gage and an observation

Welded Steel Storage Tank Section 13207-9 window. All bottom welds shall be tested and tests shall be witnessed by OWNER, unless otherwise permitted.

2. Shell Plates:

a. After tank has been completely erected, and after surface preparation for painting, it shall be filled with water furnished at tank site by OWNER at sufficient pressure to fill tank to its maximum level and inspected for leaks.

3. Piping:

a. Pipe shall be tested as required by Section 15050, Piping Systems.

4. Repair and Retesting:

a. Any leaks or defective welds shown by testing shall be repaired in accordance with requirements of AWWA D100 and to complete satisfaction of

ENGINEER.

b. After repairs have been made, water level shall be raised and repaired area shall be retested.

c. If leakage from tank is of a magnitude that entire tank must be retested, CONTRACTOR shall pay for additional water required. OWNER'S water rate schedule shall be used in computing water cost.

d. During the filling of the tank, the tank shall be inspected for leaks. Leaks occurring during or after filling of the tank, shall be repaired by drilling, chipping or gas gouging out all defective welds and rewelding. No repair work shall be done on any joint unless the water is at least two-feet below the area being repaired. If the number and/or severity of the leaks are, in the opinion of the OWNER, too extensive to correct while the tank is filled with water, the OWNER may direct that the tank be emptied and the entire disinfection and re-filling procedure be repeated until all leaks are sealed and the tank is properly disinfected. All defects and leaks shall be repaired by the CONTRACTOR in accordance with the requirements of AWWA D100 and to the complete satisfaction of the ENGINEER. The interior and exterior paint coatings shall be completely repaired, including repeat of surface preparation of the steel before re-coating.

3.3 PAINTING

A. General:

1. Except as noted herein, preparation of all surfaces and application of complete paint systems shall be performed in the field. All exposed steel surfaces, inside and outside of tank shall be painted.

2. Contact surfaces of shop assemblies, which must be cleaned before forming or welding, and surfaces that will be otherwise inaccessible after installation shall be prepared in the shop. Immediately after shop sand blasting and cleaning, contact surfaces of shop assemblies shall be coated with appropriate prime coat.

3. Apply each coating at the rate and in the manner specified by manufacturer. If material has thickened or must be diluted for application, coating shall be built up to same dry film thickness as specified for each complete system.

4. Except as modified by manufacturer's specifications, each paint system shall be applied in accordance with Paint Application Specifications No. 1 - Shop, Field and Maintenance Painting, SSPC-PA1, latest revision.

5. All coating material containers delivered to site shall be properly stored and protected against heat, freezing, moisture, outside adulteration and vandalism.

Welded Steel Storage Tank Section 13207-10

6. Coating material which has an expired shelf or pot life shall not be used.

7. Prior to surface preparation, grind smooth all areas where temporary erection brackets and supports have been welded to tank members and subsequently removed. Remove from tank surfaces all weld slag, weld spatter, oil, grease and all other foreign matter that will impair adhesion of paint.

8. The top of the rafters and top of the beams shall be sandblasted, primed and painted prior to erection.

9. Hand brush the weld seams after sandblasting and prior to applying the prime coat.

10. Apply paints only when temperature of surfaces to be painted and surrounding air temperatures are between 55°F and 95°F, unless otherwise permitted by paint manufacturer's printed instructions. Paint shall not be applied in rain, snow, fog or mist or when the relative humidity exceeds 80 percent. Anticipate dew or moisture condensation and delay painting until it can be determined with certainty that the surfaces will be dry during the painting operation. Temperature of the surface shall be at least 5°F above the dew point temperature. Each day's painting shall be completed well in advance of probable time of day when condensation will occur, in order to permit the required film drying time prior to formation of moisture.

Adequate illumination and ventilation shall be provided in all areas where surface preparation or painting is in progress.

11. Provide adequate illumination and ventilation in all areas where painting is in progress. As a minimum, conform to the requirements of AWWA D102 for safety precautions relating to ventilation, electrical grounding of illumination systems and the handling of paint, solvents and equipment.

12. CONTRACTOR shall provide an approved dry coating thickness gage to measure film thicknesses.

13. All paint and paint products used for each system shall be the product of a single paint manufacturer. All paint and paint products to be utilized for surfaces in contact with the tank contents shall be NSF approved for use in potable water service. All materials shall be brought to the jobsite in the original sealed and labeled containers of the paint manufacturer, and shall be subject to inspection by the OWNER on the site.

14. Empty paint containers shall be stored on site for inspection by the OWNER and shall not be removed until directed by the OWNER.

B. Protection of Property and Structures:

1. Protect all properties, equipment, cars, structures and all other items adjacent to tank and tank site from wasted residues resulting from cleaning, surface preparation and paint application at all times under all conditions.

2. Use shrouding, vacuum blasting or other approved methods for cleaning and surface preparation of exterior surfaces.

3. During cleaning and surface preparation of interior surfaces, control exhausting of dust, and removal and temporary storage of residues to protect adjacent property and structures.

4. For painting of exterior surfaces, use rollers, shrouding or other approved methods as required to protect adjacent property and structures from wind-blown paint residues.

5. Submit for approval, proposed procedures for cleaning, surface preparation and paint application detailing methods to be used to protect adjacent property and

Welded Steel Storage Tank Section 13207-11 structures from residues. Do not proceed with cleaning, surface preparation or painting until proposed procedures are approved by ENGINEER.

C. Surface Preparation:

1. After tank is erected and cleaned, all surfaces to be coated shall be prepared in the field as follows:

a. Interior Surfaces: SSPC-SP10 - Near White Blast Cleaning.

b. Exterior Surfaces: SSPC-SP6 - Commercial Blast Cleaning.

Adequacy of the surface preparation shall be determined by comparison with photographic standards contained in Pictorial Surface Preparation Standards for Painting Steel Surfaces, SSPC- Vis 1. CONTRACTOR shall furnish the photographic standards.

2. Prior to coating, blast products shall be removed from prepared surfaces in accordance with appropriate requirements of above noted standards.

D. Field Painting-Interior Surfaces:

1. Immediately prime field blast cleaned interior surfaces after cleaning and before any visible or detrimental rusting occurs. No blast cleaned surface shall stand overnight before being prime coated.

a. Prime Coats: Spray coat, by air or airless spray, all interior surfaces to a minimum dry film thickness of 3.0 mils for each coat.

b. Intermediate Coat: Spray coat, by air or airless spray, all interior surfaces to a minimum dry film thickness of 4.0 mils.

c. Finish Coat: Spray coat, by air or airless spray, all interior surfaces to a minimum dry film thickness of 4.0 mils, regardless of the dry coating thickness of the preceding coats.

d. Total Dry Film Thickness: Total dry film thickness of three coats shall not be less than 14.0 mils. Apply additional finish coats to deficient areas until specified minimum thickness is obtained.

e. Drying Time Between Coats: Each coat of paint shall be dried in accordance with recommendations of paint manufacturer, but in no case less than the equivalent in drying of 24 hours at 70°F and 50 percent relative humidity in a well ventilated tank.

f. Measurement of Paint Thickness: After each coat has been allowed to dry as specified, dry film thickness will be measured by a third party, NACE certified inspector. CONTRACTOR shall not apply a successive coat until dry film thickness of preceding coat or coats has been approved by inspector.

g. Drying Time for Water Immersion: Final coat shall be dried in accordance with paint manufacturer's recommendations, but in no case less than the equivalent of 168 hours (7 days) at a temperature of 70°F and a relative humidity of 50 percent in a well-ventilated tank before tank is filled with water.

E. Field Painting-Exterior Surfaces:

1. Immediately prime field blast cleaned exterior surfaces after cleaning and before any visible or detrimental rusting occurs. No blast cleaned surface shall stand overnight before being prime coated.

a. Prime Coat: Coat, by roller all exterior surfaces to a minimum dry film thickness of 4.0 mils.

Welded Steel Storage Tank Section 13207-12

b. Finish Coat: Coat, by roller all exterior surfaces to a dry film thickness of 3.0 to 4.0 mils.

c. Total Dry Film Thickness: Total dry film thickness of the three coats shall be not less than 8.0 mils. Apply additional finish coats to deficient areas until specified minimum thickness is obtained.

d. Drying Time Between Coats: Each coat of paint shall be dried in accordance with recommendations of paint manufacturer, but in no case less than the equivalent in drying of 24 hours at 70°F and 50 percent relative humidity.

e. Measurement of Paint Thickness: After each coat has been allowed to dry as specified, dry film thickness will be measured by a third party, NACE certified inspector. CONTRACTOR shall not apply a successive coat until dry film thickness of the preceding coat or coats has been approved by inspector.

3.4 DISINFECTION

A. Disinfection shall conform to all applicable requirements of AWWA C652, and as specified below.

B. After tank has been painted and interior surfaces have thoroughly dried, CONTRACTOR shall remove all visible dirt and contaminating materials. Interior of tank shall be disinfected by spraying all surfaces, including underside of roof and roof support members, with a 200 ppm chlorine solution. Solution shall remain in contact with surfaces for a minimum of 30 minutes. Technique shall be such that a sterile tank will result. After spray disinfection, tank shall be flushed to drain for at least ten minutes, then shall be filled and allowed to overflow for another ten minutes as directed by the OWNER. Samples for bacteriological tests will then be taken by CONTRACTOR.

Disinfection shall continue until bacteria-free samples are obtained.

C. If the number and/or severity of the leaks are, in the opinion of the OWNER, too extensive to correct while the tank is filled with water, the OWNER may direct that the tank be emptied and the entire disinfection and re-filling procedure be repeated until all leaks are sealed and the tank is properly disinfected.

D. Water for initial disinfection and for filling and for any additional disinfection during the initial disinfection procedure if required to obtain satisfactory bacteriological samples, will be furnished by the OWNER, to the site boundary. CONTRACTOR shall be responsible for pumps, hoses and other temporary equipment required to fill the tank.

CONTRACTOR shall furnish all of the chlorine required. CONTRACTOR shall be responsible for obtaining proper disinfection as determined by bacteriological tests made by the testing laboratory.

E. If the tank must be emptied, re-sprayed, flushed and refilled to obtain satisfactory bacteriological samples, or because of extensive leakage, the OWNER will furnish additional water for the Work at the expense of CONTRACTOR. CONTRACTOR shall also pay for the additional chlorine required.

F. After the chlorination procedure is completed and accepted by the OWNER, the tank shall be emptied. Contractor shall dispose of the liquids to a proper location at no additional cost to the Owner.

Welded Steel Storage Tank Section 13207-13

G. CONTRACTOR shall supply all necessary pumps, hoses and other required equipment each time the tank is to be emptied.

3.5 CLEANING

A. Exposed concrete surfaces shall be protected from blemishes and stains during tank construction. If discoloration of exposed concrete results from painting, rusting or any other aspects of tank construction, it shall be removed to the satisfaction of OWNER.

B. Painted surfaces shall be protected from discoloration, scratching or other damage.

CONTRACTOR shall touch-up any damaged areas prior to project completion and acceptance.

+ + END OF SECTION + +

Addendum No. 3 Exhibit C

ADOA/AZ STATE PARKS

ROCKIN RIVER STATE PARK W&WW INFRASTRUCTURE UPGRADES

ADDENDUM NO. 3

EXHIBIT C

EXHIBIT C (3 total pages, including this sheet)

• Bid Schedule