2004 Specifications CSJ 0038-03-025 See attachment

SPECIAL SPECIFICATION

5758

Elevated Tank and Foundation

SECTION 800

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RAMIRENO WATER SUPPLY CORPORATION

ELEVATED TANK & FOUNDATION

TECHNICAL PROVISIONS – TABLE OF CONTENTS

SECTION 801

SECTION 802

SECTION 803

SECTION 804

SECTION 805

SECTION 806

SECTION 807

SECTION 808

SECTION 809

SECTION 810

SECTION 811

SECTION 812

SECTION 813

SCOPE

CLEARING & GRADING

SAFETY

FOUNDATION

CONCRETE

ELEVATED TANK

COATING & PAINTING STEEL WATER STORAGE

TANK ELECTRICAL

DISINFECTION

TESTING

CLEANUP

GEOTECHNICAL

PAYMENT

TECHNICAL PROVISIONS

SECTION 801 - ELEVATED TANK

801-1 Scope

The work covered under these specifications consists of furnishing all labor, equipment, materials, and of performing all operations in connection with the construction of an Elevated Tank, complete with foundation and in place ready for use as shown on the plans, in strict accordance with these specifications and the applicable drawings and subject to the terms and conditions of the contract along with the American Water Works Association D100 (Latest Revisions) and the TCEQ "Rules and Regulations for Public Water System.

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TECHNICAL PROVISIONS

SECTION 802 - CLEARING & SITE GRADING

802 – 1 Clearing

All obstructions located within the areas indicated on the drawings to be graded, including natural obstructions, culverts, trees and boulders, shall be completely removed from the site, unless directed otherwise by the Engineer.

802 - 2 Site Grading

Uniform smooth grading of all areas on drawing in which finish contours and elevations are indicated, including excavated and filled sections and adjacent transition areas, shall be accomplished. The finished surface shall be reasonably smooth compacted, and free from irregular surface changes. All ditches and gutters shall be finished so as to drain readily.

802 – 3 Payment

No separate payment will be made for work covered under this section of the specifications and all costs in connection therewith shall be included in the contract price for the terms to which the work pertains.

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TECHNICAL PROVISIONS

SECTION 803 - SAFETY

803 – 1 General

The Contractor shall comply with all pertinent provisions of the Occupational Safety and Health Administration (OSHA) and any State Safety and Health Agency requirements.

803 – 2 Welding

The contractor shall comply with the safety precautions designated in Section 806 of these specifications for the safety of the personnel and property.

803 – 3 Coating and Painting Steel Water Storage Tanks

See Section 807 of these specifications for safety & health regulations while painting standpipe tanks.

803 – 4 Ladders

The ladder's "Unauthorized Access Resistant Section", and the top manway shall be locked as soon as construction of these items is completed to deter unauthorized persons from climbing the elevated tank prior to the fencing being erected and locked.

803 - 5 Signs

The Contractor will post a sign reading "Danger - No Trespassing" at the front perimeter of the plant site. The sign shall remain posted until the perimeter fence is erected and locked.

803 – 6 Payment

No separate payment will be made for work covered under this section of the specifications and all costs in connection therewith shall be included in the contract price for the terms to which the work pertains.

TECHNICAL PROVISIONS

SECTION 804 FOUNDATION

804 - 1 Foundation

An independent laboratory has conducted a geotechnical investigation at each tank site. The results of the investigation and the recommended foundation design is attached to and made a part of this technical provision. The foundations will be constructed in accordance with the Independent Laboratories recommended design. Concrete will be as specified in Section 805 of these specifications.

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TECHNICAL PROVISIONS

SECTION 805 - CONCRETE

805 - 1 Design References

The principal reference for construction requirements and design practices for concrete structures for buildings is Building Code Requirements for Reinforced Concrete - ACI Standard 318-77, published by the American Concrete Institute.

805 - 2 Materials

(a) Aggregate

Both coarse and fine aggregate shall conform to Federal Specifications SSA-281. Coarse aggregate shall be well graded from find to coarse, within prescribed limits. The maximum size shall be 1½ inches.

(b) Cement

Only one brand of each type of cement shall be used for exposed concrete in any individual structure. Cement reclaimed from cleaning bags or leaking containers shall not be used. Cement shall be used in the sequence of receipt of shipments, unless otherwise directed.

(c) Portland Cement

Portland Cement shall conform to Federal Specifications SS-C-192, Type 1 or Type 1-A.

805 – 3 Reinforcing Steel

All reinforcing steel will conform to ASTM Specifications Designation A-615, Grade 60 (So designated on Invoice). All welded wire fabric will conform to ASTM Specifications Designation A-185 (So designated on Invoice). All reinforcing steel and welded wire fabric shall be furnished and installed as shown on the plans and specified herein. Shop drawings of all reinforcing steel shall be submitted in triplicate for the Engineers approval. Before placed, reinforcement shall be thoroughly cleaned or rust, mill scale, or coating, including ice, that would reduce or destroy the bond.

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No splicing of bars, except where shown on the plans, will be permitted without the written approval of the Engineer. Splices which are permitted shall have a lapped length of not less than forty (40) times the nominal size or diameter of the reinforcement. Steel reinforcement shall be placed in the exact position as shown on the plans and held securely in place during the placing of the concrete. Vertical stirrups shall always pass around the main tension members and be securely attached thereto. The reinforcing steel in all concrete walls shall be spaced its proper distance from the face of the forms by means of approved galvanized metal spacers or approved precast mortar or concrete blocks. All horizontal reinforcing steel shall be supported vertically by means of approved galvanized metal bar chairs, PVC bar chairs or approved precast mortar or concrete blocks. Steel reinforcement will have a minimum cover of concrete of two inches.

805-4 Classes of Concrete

(a) Strength Requirements Concrete shall be 5 sack, 3,000 PSI compressive strength at 28 days. Concrete made with high-early strength cement shall have a seven (7) day strength equal to the specified 28 day strength for concrete made with ordinary Portland Cement.

805-5 Placement

The consistency of concrete should be such that a mass of uniform quality will result when it has been deposited in the forms. Care should be exercised to prevent the particles of sand and stone from being separated from the paste, for such separation produces an inferior concrete. Factors that must be considered in preventing segregation of aggregates are transporting the concrete from the mixing machine to the forms, dropping the concrete from too great a height, and tamping or spading. The concrete should not be dropped more than 3' into the forms. Dropping from a greater height allows the layer aggregate to settle to the bottom, thus preventing a uniform quality. Great care must be taken to see that the concrete flows properly into all corners and angles of the forms and that the reinforcement is completely surrounded with concrete.

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When concrete is placed in the forms by means of chutes, it is important that long flows be avoided because there is a possibility that the large aggregate will separate from the other materials in the mix. If the use of long chutes is unavoidable, the concrete should be deposited into a hopper from which it is taken before being placed in the forms. The purpose of this procedure is to remix the materials and thereby correct any segregation. Another cause of segregation is an excess amount of tamping, vibrating, or puddling in the forms. To avoid honeycombing a common procedure is to spade the concrete where it comes in contact with the forms. In accomplishing this, it is advisable not to spade too vigorously, since this could cause the materials to become separated.

805-6 Laitance

When an excess amount of water is used, the concrete, on curing, will have a milky layer composed of cement and fine aggregate on the upper surface of the mass called laitance. When evaporation of the excess water has been completed, this layer becomes weak, porous, and readily disintegrated and permits water to pass through under slight pressure. The removal of this thin layer before placing more concrete is of little benefit, for several inches of inferior concrete remains below. It is quite possible that the concrete at the bottom of the placing may be hard and dense. If the presence of laitance is detected, several inches below the uppermost surface should be removed. Therefore, to avoid laitance, use only a concrete of the correct consistency and water-cement ratio.

805 - 7 Curing Concrete

Regardless of the care taken in proportioning, mixing, and placing, first-quality concrete can be obtained only when due consideration and provision are made for curing. A typical specification requires that the concrete be protected so that there is no loss of moisture from the surface for a period of seven days when normal portland cement is used and three days when the cement is of high early strength. To prevent the loss of moisture during curing several methods may be employed. When hard enough to walk on, slabs may be covered with burlap which is kept wet or with a suitable building paper with the edges pasted down. Another method is to cover the slabs with a 1 inch layer of wet sand or sawdust. Frequently a 6-inch layer of wet straw or hay is placed on the slabs. Another method sometimes resorted to is the continuous sprinkling of the exposed surfaces with water.

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The early removal of forms permits undue evaporation; hence the forms should be allowed to remain for as long a period as is practicable. In addition to strength and durability, controlled curing is one of the best precautions in making a watertight concrete. The period of protection against evaporation of moisture varies with the type of structure and climatic conditions. Thin sections of concrete placed during hot weather require an increased period of protection. Low temperatures during the period of curing produce concrete of lower strength than concrete cured at 72°F. Freezing of concrete before it has cured should never be permitted to occur, for the resulting concrete will be of poor quality and indeterminate strength. Although special precautions are required, concrete work may be continued during severe weather conditions. To keep the concrete above freezing the materials may be heated before mixing or the concrete may be protected with suitable covers or kept in heated enclosures. If the weather is only moderately cold, heating the water used for mixing may be a sufficient precaution. In more severe weather, it may be necessary to heat both water and aggregates. The materials should never have a temperature exceeding 90°F when deposited. One common method of protecting concrete is to cover it with a thick layer of straw and tarpaulins. If other heating devices are used, care should be exercised to see that moisture is not evaporated from the concrete.

805 - 8 Finishing

Any honeycombed surface shall be filled and finished with a mortar of one (1): part cement and two (2) parts sand. Where honeycombing or other surface blemishes occur in concrete to be exposed to view, the entire member shall be rubbed to a present uniform appearance. Mortar shall set, be tempered for a period of one (1) our before using.

805-9 Testing

The concrete shall be tested according to the American Society for Testing and Materials ASTM Standards covering sampling and testing. (a) Slump Test Slump test will be performed when requested by the Engineer. The equipment for making the test shall be a sheet metal truncated cone 12" high with a base diameter of 8" and a top diameter of 4".

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Both ends of the cone are open with handles attached to the outside. Recommended slump for various types of construction are as follows: Slump (in.)

Type of construction Maximum Minimum Reinforced foundation 3 1 walls and footings Plain Footings, Caissons, 3 1 and Substructure Walls Beams and reinforced walls 4 1 Building columns 4 1 Pavements and slabs 3 1 Mass concrete 2 1

(a) Compression Test

Test cylinders will be taken from all pours. Three (3) cylinders will be taken each 50 yards or portion of 50 yards of concrete placed and/or from each smaller pour regardless of size. Tests of compression strength will be made at periods of 7 and 28 days. The specimen to be tested will be cylindrical in shape and have a height twice its diameter. The standard cylinder is 6 in. in diameter and 12 in. high when the maximum size of the coarse aggregate does not exceed 2 in. For larger aggregates, the cylinder should have a diameter at least three times the maximum size of the aggregate and its height should be twice the diameter. The mold shall be placed on a smooth plane surface (glass or metal plate) and filled with freshly made concrete in a specified number of layers. Each layer will be consolidated by rodding or vibrating, either method being acceptable for concretes with a slump of 3 to 1 in. If the slump is greater than 3 in., the concrete must be rodded; if it is less than I in., it must be vibrated. As soon as casting of the cylinder is complete, the top of the cylinder will be covered to prevent concrete from drying. The cylinder shall remain at the site of operation for 24 hours and then be delivered to a certified laboratory engaged in the business of concrete testing. All 28 day tests must meet specified limits. Two (2) copies of all test results will be mailed to the Engineer directly from the laboratory.

805-10 Payment

No separate payment will be made for work covered by this section of the specifications, and all costs in connection therewith shall be included in the contact price for the item to which the work pertains.

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There will be no additional compensation for changing the proportions of the mix to overcome field deficiencies and to obtain the specified qualities and characteristics of the concrete.

TECHNICAL PROVISIONS SECTION 806 - ELEVATED TANK 806 – 1 Applicable Specifications

The following specifications and standards of the issues listed below, but referred to thereafter by basic designation only, form a part of this specification. The elevated tank shall be as fabricated by Pheonix Tank Fabricators or approved equal. American Water Works Association - D 100 (Latest Revision) - Welded Steel Elevated Tanks, Standpipes and Reservoirs for Water Storage. TCEQ "Rules and Regulations for Public Water Systems".

806 – 2 General

The Elevated Tank shall be of the size shown on the plans and will be of welded construction and shall be constructed of new materials as specified in this section and as shown on the drawings.

806 – 3 Material

All material used in the construction of the tank will be new and conform to AWWA Specifications D 100 (Latest Revision).

(a) Bolts, Anchor Bolts and Rods Bolts and anchor bolts shall conform to ASTM A307, Grade B. ASTM A36 bar stock shall be considered an acceptable alternative for material for anchor bolts. Rods shall be open-hearth, electric-furnace, or basic-oxygen-process steel conforming to ASTM A36. Where ASTM A307 bolts are not readily available ASTM A325 bolts may be substituted. Lock nuts shall be provided or the threaded ends of the anchor bolts shall be peened to prevent loosening of anchor nuts. (b) Reinforced Steel Reinforced steel shall comply with the requirements of ACI 318.

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(c) Plate.

Plates materials shall be open-hearth, electric-furnace or basic-oxygen process steel conforming to any of the following ASTM Specifications - A36; A131, grades A and B; A283, grades A,B,C, and D; or A573, grade 58. The contractor shall furnish the Engineer with five (5) copies of the mill test reports on the steel to be used during construction

806 - 4 Design

The tank shall be designed in accordance with AWWA Specifications D 100 (latest revisions) for dead load, live load a n d wet load and the TCEQ "Rules and Regulations for Public Water Systems". Design loads shall include allowance for 125 mph winds. Corrosion allowance for all steel plates shall be 1/16 inch. The minimum thickness for any part of the structure shall be 3/16" for parts-not in contact with the water and 1/4" for parts other than cylindrical shell plates that will be in contact with the water when the tank is full. No area of the roof shall have a slope of less than 0.75 inch per foot. Prior to any fabrication or construction the Contractor shall furnish five (5) copies of tank and foundation design drawings to the Engineer for approval. These drawing shall be in detail, showing loading, bearing, dimensions, bill of material, method of construction and sequence of construction.

806 - 5 Welding

(a) Qualifications of Welders and Welding_Operators

The contractors shall conduct tests and maintain records for all welders assigned to manual or semiautomatic and all welding operators assigned to automatic or machine welding in order to demonstrate their ability to make acceptable welds as per AWWA D 100, Section 8.

(b) Safety in Welding and Cutting

Operations involving welding, cutting, brazing or allied processes shall conform with ANSI 249.1 for the protection of welders, welding operators and nearby personnel.

(c) Safe Usage of Cutting and Welding Processes

Procedures shall conform with NFPA 51B for the prevention of fire and property damage.

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(d) Welder's Credentials

Before any welding is performed, the contractor shall make certain that the welders or welding operators have their credentials for acceptance.

806 - 6 Painting

All coating and painting will be in accordance with the Technical Provisions "Coating and Painting Steel Water Storage Tanks" Section 807 of these specifications and will be in accordance with ANSI/NSF Standard 61 for coating in contact with water and must be certified by an organization accredited by ANSI.

806 - 7 Disinfection

The tank shall be disinfected in accordance with Section 809 of these specifications prior to being placed in service.

806 - 8 Accessories

(a) Riser Manway A 24" diameter manway will be provided at the bottom of the riser pipe. The bolts are to be stainless steel. The shell plate where the manway is are located shall be reinforced to comply with AWWA D 100, Section 3.13. (b) Riser Pipe - Inlet-Outlet_Pipe The welded steel riser pipe shall be not less than 36" in diameter. The inlet-outlet pipe shall be a 12" pipe through the riser foundation equipped with a 12" flanged elbow. (c) Overflow The tank shall be equipped with a 6" overflow pipe to within 12" from ground line. Minimum overflow pipe thickness shall be 3/16". The overflow pipe outlet shall be equipped with a gravity hinged and weighted cover and a neoprene gasket. The cover shall fit tightly with no gap over 1/16".

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(d) Ladders

The contractor shall furnish and install the inside and outside tank ladders complete with safety cable & belt. The rungs shall not be less thank 314" round spaced 12" apart on centers. All elevated tank ladders will be equipped with an "Unauthorized Access Resistant Section" as furnished by R & R Engineering & Fabrication, Corpus Christi, Texas (361) 883-1984 or approved equal. (e) Top Opening The contractor shall furnish a roof opening that is not less that 30" in diameter to be located near the outside tank ladder. The opening shall be provided with a hinged cover, neoprene gasket and hasp for locking. The opening shall have a curb at least 4" high and the cover shall have a downward overlap of a least 2". (f) Vent A 24" vent and finial shall be installed on the roof in the center of the tank. The vent openings shall be covered by a 16 mesh non-corrosive screen to prevent insects from entering the vent. (g) Drain The riser pipe shall be equipped with a 6" flanged drain outlet. (h) Data Plate The contractor shall attach to the completed tank a data plate complete with the tank dimensions, serial number, date of construction, capacity, and manufactures name, address and phone number. (i) Water Level Indicator - Target Type An 18" target type water level indicator shall installed on the tank. The indicator shall be attached to the side of the tank at the height necessary as to show the water level in the tank thru the normal operating range from low to full.

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(j) Electrode Control An Electrode Holder with two electrodes shall be furnished and installed with wiring to ground level. One will be sized to be 6" below overflow and the other 18" below overflow. (j) Sign Ramireno Water Supply Corporation's Name will be painted on two sides of tank. The Logo will be painted multicolor blue. The sign will be sized as large as possible to be read from one point. (1) Obstruction Lighting Obstruction lighting with necessary wiring to ground level will be furnished and installed. All accessories should be field orientated in order to properly utilize drainage, lighting and visibility.

806 - 9 Special Construction

In addition to all AWWA D 100 requirements (latest revisions) the following will be required: All beams, supports, etc. required to support tank top shells shall be completed "welded out" so that no moisture can penetrate tank top and support. All joints shall be welded. All joints will be welded inside and outside. The joints between the shell and the top shall be welded inside and outside. All saddles shall be equally spaced around the columns and all bolts shall be centered in the saddles.

806 - 10 Payment

Partial payment estimates will be paid on a monthly basis. The Estimates will have to be approved by the Engineer and Owner.

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TECHNICAL PROVISIONS SECTION 807 - COATING & PAINTING STEEL WATER STORAGE TANKS

807 - 1 Reference Specifications and Standards

A. Without limiting the general aspects of other requirements of these specification, all surface preparation, coating and painting of interior and exterior surface shall conform to the applicable requirements of t h e Steel Structures Painting Council, ASSA D102 (latest revision) and the manufacture's printed instructions.

B. All coating and painting will be in accordance with ANSI/NSF

Standard 61 for coating in contact with water and must be certified by an organization accredited by ANSI.

C. The Engineer's decision shall be final as to interpretation and/or

conflict between any of the reference specifications and standards contained herein.

807 - 2 Contractor The contractor shall have three (3) years practical experience and successful history in the application of specified products to surfaces of steel water tanks. Upon request, he shall substantiate this requirement by furnishing a list of references and job completions. 807 - 3 Quality Assurance

A. Quality assurance procedures and practices shall be utilized to monitor all phrases of surface preparation, application and inspection throughout the duration of the project. Procedures or practices not specifically defined herein may be utilized provided they meet recognized and accepted professional standards and are approved by the Engineer.

B. Surface preparation will be based upon comparison with:

1. "Pictorial Surface Preparation Standards for Painting Steel

Surfaces", SSPC-VIS 1 ASTM Designation D220.

2. "Standard Methods of Evaluation Degree of Rusting on Painted Steel Surfaces", SSPC-VAS-2 ASTM D610.

3. "Visual Standard for Surfaces of New Steel Air-blast

Cleaned with San Abrasive".

4. If the above conditions are prevalent, coating or painting shall be delayed or postponed until conditions are favorable.

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5. The day's coating or painting shall be completed in time to permit the film sufficient drying time prior to damage by atmospheric conditions.

C. Thickness & Holiday Checking

Thickness of coating and paint shall be checked with a non-destructive, magnetic type thickness gauge. Use an instrument such as the Tooke Gauge if a destructive tester is deemed necessary. Coating integrity of interior coated surfaces shall be tested with an approved inspection device. Holiday detection shall be performed prior to application of aluminum or metallic finish coats. Non-destructive holiday detectors shall not exceed 67 h volts nor shall destructive holiday detectors exceed the voltage recommended by the manufacturer of the coating system. For thickness between 10 and 20 mils (250 microns and 500 microns), a non-sudsing type setting agent, such as Kodak Photo-Flo, shall be added to the water prior to wetting the detector sponge. All pinholes shall be marked, repaired in accordance with the manufacturer's printed recommendations and retested. No pinholes or other irregularities will be permitted in the final coating.

D. Inspection Devices

The contractor shall furnish, until final acceptance of coating and painting, inspection devices in good working condition for detection of holidays and measurement of thy-film thickness calibration plates to test accuracy of dry-film thickness gauge and certified instrumentation to' test accuracy of holiday detectors.

Dry-film thickness gauges and holiday detectors shall be made available for the Engineer's use at all times until final acceptance of application. Holiday detection devices shall be operated in the presence of the Engineer or his representatives.

E. Independent Testing

The quality of abrasive blasting to meet these specifications will be certified to by an independent testing laboratory. The thickness of coating, and holiday checking will be conducted on the tank (bottom before placement) and on the entire tank by an independent testing laboratory. The coatings shall be certified by the laboratory to be in accordance with these specifications relative to abrasive blasting, coating thickness, and pinhole checking. The laboratory shall furnish five (5) copies of the testing certification to the Engineer for distribution. The contractor will select the laboratory to perform the testing, subject to approval by the engineer and will include all costs associated with the testing in the bid for the item to which it pertains (no additional cost will be paid for laboratory test).

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This testing does not relieve the contractor of his responsibility to warrant all work for one year.

F. Warranty Inspection

Warranty inspection shall be conducted during the eleventh month following completion of all coating and painting work. All defective work shall be repaired in accordance with this specification and to the satisfaction of the Engineer/Owner.

807-4 Safety & Health Requirements

A. General

In accordance with requirements set forth by regulatory agencies applicable to the construction industry and manufacturer's printed instructions and appropriate technical bulletins and manuals, the Contractors shall provide and require use of personal protective lifesaving equipment for persons working in or about the project site.

B. Head & Face Protection & Respiratory Devices

Equipment shall include protective helmets which shall be worn by all persons while in the vicinity of the work. In addition, workers engaged in or near the work during abrasive blasting shall wear eye and face protection devices and air purifying, half-mask or mouthpiece respirator with appropriate filter. Barrier creams shall be used on any exposed areas of skin.

C. Ventilation

Where ventilation is used to control hazardous exposure, all equipment shall be explosion-proof. Ventilation shall reduce the concentration of air contaminant to the degree a hazard does not exist. Air circulation and exhausting of solvent vapors shall be continued until coatings have fully cured.

D. Sound Levels

Whenever the occupational noise exposure exceeds maximum allowable sound levels, the Contractor shall provide and require the use of approved ear protective devices.

E. Illumination

Adequate illumination shall be provided while work is in progress, including explosion-proof lights and electrical equipment. Whenever required by the Engineer, the Contractor shall provide additional illumination and necessary supports to cover all areas to be inspected.

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The level of illumination for inspection purposes shall be determined by the Engineer.

F. Temporary Ladders & Scaffolding

All temporary ladders and scaffolding shall conform to applicable safety requirements. They shall be erected where requested by the Engineer to facilitate inspection and be moved by the Contractor to locations requested by the Engineer.

807-5 Product

A. Materials specified are those which have been evaluated for the specific service. Products of the Valspar Company are listed to establish a standard of quality. Products of Teeemec Company and Koppers Company are acceptable and requests for substitution must be approved in writing. Substitutes shall have a successful five year record on projects of a similar nature.

B. All materials shall be brought to jobsite in original sealed

containers. They shall not be used until the Engineer has inspected contents and obtained data from information on containers or label. Materials exceeding storage life recommended by the manufacturer shall be rejected.

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

D. Interior Tank Coating System: High Build Epoxy

E. Surface Preparation: Near White Blast Cleaning (SSPC-SPIO)

F. After surface preparation and prior to painting, all weld seems

must be brushed with a coating of Tnemec 204255.

G. Seams: Tnemee 20-1255 Beige at 2.0 dry mils

H. Coat: Tnemec Series 20 Beige at 4.0-6.0 dry mils

I. Coat: Tnemec Series 20 White at 4.0-6.0 dry mils.

J. Exterior Tank Coating System: Exterior System II

K. Surface Preparation: Commercial Blast Cleaning (SSPC-SP6)

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L. Remove all oil and grease from the metal surface prior to blast cleaning. The surface shall be blast cleaned to a Commercial Finish

SSPS Spec 5p.6, removing all dirt, rust scale and foreign matter.

M. Coat: Tnemec Series 20-1255 Beige at 3.0-5.0 dry mils

N. Coat: Tnemec 40 Epoxiline at 2.0-3.0 dry mils

O. Coat: Tnemec Series 75 Endura Shield at 2.0 to 3.0 mils

807-5 Disinfection Material

Disinfection material shall conform to all the requirements of applicable AWWA Standards and regulatory agencies.

A. All surface preparation, coating and painting shall conform to applicable standards of the Steel Painting Council, and the manufacturer's printed instructions. Material applied prior to approval of the surface by the Engineer shall be removed and reapplied to the satisfaction of the Engineer at the expense of the Contractor.

B. All work shall be performed by skilled craftsmen qualified to perform the required work in a manned comparable with the best standards of practice. Continuity of personnel shall be maintained and transfers of key personal shall be coordinated with the Engineer.

C. The Contractor shall provide a supervisor at the work site during cleaning and application operations. The supervisor shall have the authority to sign change orders, coordinate work and make decisions pertaining to the fulfillment of the contract.

D. Dust, dirt, oil, grease or any foreign matter that will affect the adhesion or durability of the finish must be removed by washing with clean rags dipped in an approved cleaning solvent and wiped dry with clear rags.

E. Coating and painting systems included surface preparations, prime coating and finish coating. Unless otherwise specified, prime coating shall be field applied. Where prime coating are shop applied, the Contractor shall instruct suppliers to provide the prime coat compatible with the finish coat specified. Any off-site work which does not conform to this specification is subject to rejection by the Engineer.

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F. Applied prime coating which is damaged during transportation construction or installation shall be thoroughly cleaned and touched up in the field as directed by the Engineer. The Contractor shall use repair procedures which insure the complete protection of all adjacent primer. The specified repair method and equipment may include wire-brushing, hand or power tool cleaning or dry air blast cleaning. In order to prevent injury to surrounding painted areas, blast cleaning may require use of lower air pressure, small nozzle and abrasive particle sizes, short blast nozzle distance from surface shielding and masking. If damage is too extensive or uneconomical to touch-up, then the item shall be re-cleaned and coated or painted as directed by the Engineer.

G. The Contractor's coating and painting equipment shall be designed for application of materials specified and shall be maintained in first class working condition. Compressors shall have suitable traps and filters to remove water and oils from the air. Contractor's equipment shall be subject to approval of the Engineer.

H. Application of the first coat shall follow immediately after surface preparation and cleaning and within and eight hour working day. Any cleaned areas not receiving first coat within eights hour period shall be re-cleaned prior to application of first coat.

I. Prior to assembly, all surfaces made inaccessible after assembly shall be prepared as specified herein and shall receive the coating and paint system specified.

807 - 7 Surface Preparation

A. The latest revision of the following surface preparation specifications of the Steel Structures Painting Council shall form a part of these specification:

1. Solvent Cleaning (SSPC-SPI)

Removal of oil, grease, soil and contaminants by use of solvents, emulsions, cleaning compounds, steam cleaning or similar materials and methods which involve a solvent or cleaning action.

2. Hand Tool Cleaning (SSPS-SP2)

Removal of loose rust, loose mill scale and other detrimental foreign matter to a degree specified by hand chipping, scraping, sanding and wirebrushing.

3. Power Tool Cleaning (SSPS-SP3)

Removal of loose rust, loose mill scale and other detrimental foreign matter to degree specified by power wirebrushing, power impact tools or power sanders.

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4. White Metal Blast Cleaning (SSPC-SP5)

Blast cleaning to a graywhite uniform metallic color until each element of surface area is free of all visible residues.

5. Commercial Blast Cleaning (SSPC-SP6)

Blast cleaning at least two-thirds of each element of surface area is free of all visible residues.

6. Brush-Off Blast Cleaning (SSPC-SP7)

Blast cleaning to remove loose rust, loose mill scale and other detrimental foreign matter to degree specified.

7. Near White Blast Cleaning (SSPC-SP10)

Blast cleaning to nearly white metal cleanliness, until at least 95 percent of each element of surface area if free of all visible residues.

B. Slag and weld metal accumulation and spatters not removed by the

Fabricator, Erector or Installer shall be removed by chipping and grinding. All sharp edges shall be peened, ground or otherwise blunted as required by the Engineer.

C. Field blast cleaning for all surfaces shall be dry method unless

otherwise directed.

D. Particle size of abrasives used in blast cleaning shall be that which will produce a 1 lh - 2 mil (37.5 microns - 50.0 microns) surface profile or in accordance with recommendations of the specified coating or paint system to be applied.

E. Abrasive used in blast cleaning operations shall be new, washed,

graded and free of contaminants that would interfere with adhesion of coating or paint and shall not be reused unless specifically approved by the Engineer.

F. During blast cleaning operations, caution shall be exercised to

insure that existing coating or paint are not exposed to abrasion form blast cleaning.

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G. Contractor shall keep the area of his work in a clean condition and shall not permit blasting material to accumulate as to constitute a nuisance or hazard to the prosecution of the work of the operation of the existing facilities.

H. Blast cleaned surfaces shall be cleaned prior to application of specified coating or paint. No coating or paint shall be applied over damp or moist surfaces.

I. All welds shall be neutralized with a suitable chemical compatible with the specified coating materials.

J. Specific Surface Preparation Surface preparation for the specific system shall be as noted in Part 2, 5.1 Paragraphs (d) and (e).

807 - 8 Application, General

A. Coating and paint application shall conform to the requirements of the Steel Structures Painting Council Paint Application Specification SSP-PC 1, latest revision, for "Shop, Field and Maintenance Painting", the American Water Works Association and the manufacturer if the coating and paint materials.

B. Thinning shall be permitted only as recommended by the manufacturer and approved by the Engineer.

C. Each application of coating, or paint shall be applied evenly, free of brush marks, sags, runs with no evidence of poor workmanship. Care shall be exercised to avoid lapping on glass or hardware. Coating and paints shall be sharply cut to lines. Finished surfaces shall be free from defects or blemishes.

D. Protective coverings or drop cloths shall be used to protect floors, fixtures and equipment. Care shall be exercised to prevent coating or paints from being splattered onto surfaces which are not coated or painted. Surface from which materials cannot be removed satisfactorily shall be recoated or repainted as required to produce a finish satisfactory to the Engineer.

E. When two coats or more of coating or paint are specified, the coats shall contain sufficient approved color additive to act as an indicator of coverage.

F. Thickness per coat specified in Part 2, 2.1, Paragraphs (d) and (e) are minimum required. Contractor shall apply additional coats as necessary to achieve the specified thickness.

G. All material shall be applied as specified.

H. All welds and irregular surfaces shall receive a brush coat of the specified product prior to application of the first complete coat.

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807 – 9 Coating Application System Application

After completion of surface preparation as specified for the specific system, materials shall be applied as noted in Par 2, 2.1, Paragraphs (d) and (e).

807 – 10 Color Scheme

The Owner shall select colors for the project. The contractor shall submit three (3) copies of a current chart of the manufacture's available colors to the Engineer to obtain owner selection thirty (30) days prior to the start of coating and painting operations.

807 – 11 Disinfection

A. Disinfection of interior surfaces shall be performed in accordance with AWWA C652 (latest revisions).

B. Disinfection shall be performed after protective coating has been

applied to the interior surfaces and allowed to thoroughly cure.

C. Prior to disinfecting, the complete interior shall be washed down with clean water and thoroughly flushed out.

D. All interior surfaces shall be thoroughly washed with a solution having a minimum chlorine dosage of 50ppm. Chlorine solution accumulated on the bottom shall be drained to waste. Rinsing with clear water is not required.

807 - 12 Solvent Vapor Removal

All solvent vapors shall be completely removed by suction type exhaust fans and blowers before placing in operating service.

807 - 13 Final Cleanup

Upon completion of the work, all staging, scaffolding and containers shall be removed from the site or destroyed in a manner approved by the Engineer. Coating and paint spots and oil or stains upon adjacent surfaces shall be removed and the job site cleaned. All damage to surfaces resulting from the work of this section shall be cleaned, repaired or refinished to the satisfaction of the Engineer at no cost to the Owner.

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807 - 14 Payment No separate payment will be made for the work covered under this section unless set out as a separate bid item, and all costs in connection therewith shall be included in the contact price for the item to which the work pertains.

TECHNICAL PROVISIONS

SECTION 808 – TANK ELECTRICAL

808-1 Applicable Codes and Regulations

The latest National Electric Manufactures Association, National Electric Code, American Institute of Electrical Engineers’ Rules and State and Local codes and regulations apply and form a part of this contract.

808-2 Materials

All materials shall conform to the requirements of the latest rules, codes and regulations of the above mentioned authorities. All conductors shall be copper unless otherwise specified and shall be size and type to conform to the requirements of National Electric Safety Code for loading and location. All conduits shall be galvanized, rigid, and shall bear the Underwriters Laboratories label. All switches and controls shall be the size specified and shall comply with the NEMA standards. All devices, controls, and material shall be subject to the applicable codes and regulations. Any deviation or change made from plans and specifications shall have the prior approval of the Engineer.

808-4 Installation

All electrical circuits, devices, controls, etc., shall be installed as indicated on the plans.

808-5 Payments

No separate payment will be made for work covered under this section of the specifications and all costs in connection therewith shall be included in the contract price for the items to which the work pertains.

TECHNICAL PROVISIONS SECTION 809 - DISINFECTION 809 - 1 General

All disinfection will be carried out in strict accordance with ANSIIAWWA C652 (latest revision) "Disinfection of Water - Storage Facilities". This standard for disinfection of water storage facilities covers materials,

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facility preparation, application of disinfectant to interior surfaces, and sampling and testing for the presence of coliform bacteria. All new storage facilities shall be disinfected before they are placed in service. All storage facilities taken out of service for inspecting, repairing, painting, cleaning, or other activity that might lead to contamination of the water shall be disinfected before they are returned to service.

809 - 2 Cleaning

All scaffolding, planks, tools, rags, and other materials not part of the structural or operating facilities of the tank shall be removed. Then the surfaces of the walls, floor, and operating facilities of the storage facility shall be cleaned thoroughly using a high-pressure water jet, sweeping, scrubbing, or equally effective means. All water,`dirt, and foreign material accumulated in this cleaning operation shall be discharged from the storage facility or otherwise removed.

809 - 3 Methods of Chlorination

(a) Chlorination Method I The water storage facility shall be filled to the overflow level with potable water to which enough chlorine is added to provide a free chlorine residual in the full facility of not less than 10 mg/L at the end of the appropriate 6-h or 24-h period. The chlorine, either as calcium hypochlorite, sodium hypochlorite of liquid chlorine, shall be introduced into the water as described hereafter.

1. Liquid-chlorine use. Liquid chlorine shall be introduced into the

water filling the storage facility in such a way as to give a uniform chlorine concentration during the entire filling operation. Portable chlorination equipment shall be carefully operated and shall include a liquid-chlorine cylinder, gas-flow chlorinator, chlorine ejector, safety equipment, and an appropriate solution tube to inject the high-concentration chlorine solution into the filling water. The solution tube shall be inserted through an appropriate valve located on the inlet pipe and near the storage facility such that the chlorine solution will mix readily with the inflowing water.

2. Sodium hypochlorite use. Sodium hypochlorite shall be added to

the water entering the storage facility be means of a chemical-feed pump, or shall be applied by hand-pouring into the storage facility and allowing the inflowing water to provide the desired mixing.

3. When a chemical-feed pump is used, the concentrated chlorine solution shall be pumped through an appropriate solution tube so as to inject the high-concentration chlorine solution at a rate that will give a uniform chlorine concentration in the filling water.

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4. The solution tube shall be inserted through an appropriate valve located on the inlet pipe and near the storage facility, or through an appropriate valve located on the storage facility such that the chlorine solution will mix readily with the filling water.

5. When the sodium hypochlorite poured into the storage facility, the filling of the storage facility shall begin immediately thereafter or as soon an any removed manhole covers can be closed. The sodium hypochlorite may be pored through the cleanout or inspection manhole in the lower course or level of the storage facility it through the roof manhole. The sodium hypochlorite shall be poured into water in the storage facility when such water is not more that 3 ft. (0.9 m) in depth, nor less than I ft. (0.3 m) in depth or as close thereto as manhole locations permit.

6. Calcium hypochlorite use. Calcium hypochlorite granules or tablets broken or crushed to sizes not larger that 1/4 in. (6.4-mm) maximum dimension may be poured or carried into the storage facility through the cleanout or inspection manhole in the lower course or level of the storage facility or through the manhole roof. The granules or tablet particles shall be located so that the inflowing water will ensure a current of water circulating through the calcium hypochlorite, dissolving it during the filling operation. The calcium hypochlorite shall be placed only on dry surfaces unless adequate precautions are taken to provide ventilation or protective breathing equipment.

7. Retention period. After the storage facility has been filled with the disinfecting water, it shall stand full as follows: (1) for a period of not less that 6 h when the water entering the storage facility has been chlorinated uniformly by gas-feed equipment or chemical pump, or (2) for a period of not less that 24 h when the storage facility has been filled with water that has been mixed with sodium hypochlorite or calcium hypochlorite within the storage facility.

8. Handling of disinfection water. After the retention period the free chlorine residual in the storage facility shall be reduced to a concentration appropriate for distribution (not more than 2 mg/L) by completely draining the storage facility and refilling with potable water, or by a combination of additional holding time and blending with potable water having a low chlorine concentration. When an appropriate chlorine concentration is reached and subject to satisfactory bacteriological testing and acceptable aesthetic quality, such water may be delivered to the distributions system.

9. The environment into which the chlorinated water is to be discharges shall be inspected, and if there is any likelihood that the chlorinated discharge will cause damage, then a reducing agent shall be applied to the water to be wasted to thoroughly neutralize the chlorine residual in the water.

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Federal, state, or local environmental regulations may require special provisions or permits prior to disposal of highly chlorinated water. The proper authorities should be contracted prior to disposal of highly chlorinated water.

(b) Chlorination Method 2

A solution of 200-mg/L available chlorine shall be applied directly to the surfaces of all parts of the storage facility that would be in contact with water when the storage facility is full to the overflow elevation.

10. Method of application. The chlorine solution may be applied with

suitable brushes or spray equipment. The solution shall throughly coat all surfaces to be treated, including the inlet and outlet piping, and shall be applied to any separate drain piping such that it will have available chlorine of not less than 10 mg/L when filled with water. Overflow piping need not be disinfected.

11. Retention. The disinfected surfaces shall remain in contact with the strong chlorine solution for at least 30 min, after which potable water shall be admitted, the drain piping purged of the 10-mg/L chlorinated water, and the storage facility then filled to its overflow level. Following this procedure, and subject to satisfactory bacteriological testing and acceptable aesthetic quality, such water may be delivered to the distribution system

(c) Chlorination Method 3

Water and chlorine shall be added to the storage facility in amounts such that the solution will initially contain 500 mg/L available chlorine and will fill approximately 5 percent of the total storage volume. This solution shall be held in the storage facility for a period of not less than 6 h.

The storage facility shall then be filled to the overflow level by flowing potable water into the highly chlorinated water. It shall be held full for a period of not less that 24 h. All highly chlorinated water shall then be purged from the drain piping. Following this procedure, and subject to satisfactory bacteriological testing and acceptable aesthetic quality, the remaining water may be delivered to the distribution system.

809 - 4 Bacteriological Sampling and Testing

After the chlorination procedure is completed, and before the storage facility is placed in' service, water from the full facility shall be sampled and tested for coliform organisms in accordance with the latest edition of Standard Methods for the Examination of Water and Wastewater. The testing method used shall be either the multiple-tube fermentation technique or the membrane-filter technique.

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(a) 4.4.1 Test for odor. The water in the full facility should also be tested to assure that no offensive odor exists due to chlorine reactions or excess chlorine residual.

(b) 4.4.2 Results of testing. If the test for coliform organisms is negative, then the storage facility may be placed in service. If the test shows the presence of coliform bacteria, then the situation shall be evaluated by the Engineer. In any event, repeat samples shall be taken until two consecutive samples are negative, or the storage facility shall again be subject to disinfection.

(c) Care in sampling. The samples shall be taken from a sample tap on the outlet piping from the storage facility or from a sample tap connected directly to the storage facility. In either case, the operation shall be such that the sample collected is actually from the water that has been in the storage facility.

(d) Recommended additional samples. During the disinfection operation and the required sampling of water from the storage facility, it is recommended that samples be taken from water inflowing to the storage facility' to determine if coliforms are present in the typical potable water source

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TECHNICAL PROVISIONS

SECTION 810 - TESTING 810 – 1 Concrete

Concrete testing on tank foundations will be performed in strict accordance to Section 805 of these specifications.

810 - 2 Welding

(a) All welders and welding operators are to be certified in strict

compliance with Section 806 of these specifications. (b) All "Special Construction" requirements requested in Section 806 of

these specifications are to be certified to.

810 - 3 Painting

Certified painting inspection will be carried out in strict accordance with Section 807 of these specifications.

810 - 4 Disinfection

All tanks will be disinfected in strict accordance with Section 809 of these specifications.

810 - 5 Reports

Five (5) copies of all reports shall be submitted to the Engineer on all testing performed according to the aforementioned specifications.

810 - 6 Payments

No separate payment will be made for work covered under this section of the specifications and all costs in connection therewith shall be included in the contract price for the items to which the work pertains.

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TECHNICAL PROVISIONS

SECTION 811 - FINAL CLEANUP

811 - 1 Final Cleanup

Upon completion of the work and before acceptance and final payment, the contractors shall remove rubbish, brush, unused materials and temporary structures from the limits of the property and restore, in a manner acceptable to the Engineer, all property both public and private that has been damaged during prosecution of the work, and shall level and grade all portions of the work where the surface of the natural ground or street surface has been disturbed during construction and shall leave the site of the work in a neat and presentable condition, free from ruts or holes.

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TECHNICAL PROVISIONS

SECTION 812 - GEOTECHNICAL

812 - 1 Geotechnical

A geotechnical investigation (GEOTECHNICAL ENGINEERING STUDY FIFTY THOUSAND GALLON ELEVATED WATER STORAGE TANK ZAPATA COUNTY, TEXAS Terracon Project No 89095017 May 29, 2009 has been conducted and is included as part of these specifications.

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SECTION 813 - PAYMENT

813-1 Payment

All items associated with this specification will not be paid for separately but as a lump sum under “500000 gallon elevated storage tank and site improvements”. Payments will be made monthly as a percentage of the work complete.