Attachment J1 - Project Manual.pdf

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NCTR WATER WELL

18-5787

TABLE OF CONTENTS

SECTION NO. SECTION TITLE NUMBER OF PAGES

DIVISION 2 SITEWORK

02086 Manually Operated Valves 02200 Site Preparation 02231 Clearing & Grubbing 02300 Earthwork 02315 Trench Excavation, Backfill and Compacting 02401 Right-of-Way Undercrossings 02510 Disinfection of Water Distribution System 02514 Cement-Lined Ductile Iron Pipe and Fittings - Water 02515 Polyvinyl Chloride (PVC) Pipe and Fittings - Water 02519 Steel Piping and Fittings 02520 Well Drilling and Casing 02522 Well Pump and Motor 02525 Water Supply Production Well 02661 Hydrostatic Testing of Water Distribution System 02730 Gravel Surfacing 02821 Chain Link Fence and Gates 02900 Landscaping 02923 Seeding 02924 Sodding

DIVISION 3 CONCRETE

03002 Site Concrete Reinforcing Steel 03003 Site Cast-in-Place Concrete

DIVISION 4 NOT USED

DIVISION 5 METALS

05000 Miscellaneous Metals 05500 Fabricated Metalwork and Castings

DIVISION 6 - 8 NOT USED

DIVISION 9 FINISHES

09901 Painting

DIVISION 10 - 15 NOT USED

DIVISION 16 ELECTRICAL

16000 Electrical - General Provisions 16110 Raceways, Boxes, Fittings and Supports

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16120 Wires and Cables (600 Volt Maximum) 16191 Miscellaneous Equipment 16289 Surge Protection For Low-Voltage Electrical Power Circuits 16470 Panelboards 16481 Variable Frequency Motor Controllers 16600 Underground System 16660 Grounding System

APPENDIX

18-5787 02086 7/3/19 Manually Operated Valves

SECTION 02086

MANUALLY OPERATED VALVES

PART 1. GENERAL

1.1 SUMMARY

A. Furnish and install manually operated valves.

1.2 RELATED SECTIONS

A. Section 02514 - Cement-Lined Ductile Iron Pipe and Fittings.

B. Section 02515 - Polyvinyl Chloride (PVC) Pipe and Fittings.

1.3 REFERENCES

A. American Water Works Association, 6666 West Quincy Avenue, Denver, Colorado 80235.

1. AWWA C500-02 - Gate Valves for Water and Sewerage Systems.

2. AWWA C509-01 - Resilient-Seated Gate Valves for Water and Sewage Systems.

B. ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA, 19428-2959.

1. ASTM A126 - Specification for Gray Iron Castings for Valves, Flanges, and Pipe

Fittings.

2. ASTM B61 - Specification for Steam of Valve Bronze Castings.

PART 2. MATERIALS

2.1 GENERAL

A. Items specified shall be the end products of one manufacturer in order to achieve standardization for operation, maintenance, spare parts, and manufacturer's services.

B. Valves to be complete with necessary operators, valve boxes, extension stems, floor stands, worm and gear operators, operating nuts, etc., required for proper completion of work.

C. Valves of equal quality by other manufacturers will be considered in accordance with the General Conditions.

D. Renewable parts including discs, packing, and seats shall be of types recommended by valve manufacturer for intended service.

7/3/19 Manually Operated Valves

E. Units shall have name of manufacturer and size of valve cast on the body or bonnet or shown on a permanently attached plate in raised letters.

2.2 DESIGN FEATURES

A. Brass and bronze components of valves and appurtenances which have surfaces in contact with the water shall be alloys containing less than 16 percent zinc and 2 percent aluminum.

B. Stainless steel Alloy 18-8 may be substituted for bronze at the option of the manufacturer and with the approval of the Engineer.

C. All gland bolts on iron body valves shall be bronze and shall be fitted with brass nuts.

2.3 VALVE OPERATORS

A. Open by turning counterclockwise.

B. Worm and gear operators to be of totally enclosed design, so proportioned as to permit operation of the valve under full operating head with a maximum pull of 40 pounds on the operator.

C. Self-locking type to prevent the disc or plug from creeping.

D. Self-locking worm gears to be a one-piece design of gear bronze material, accurately machine cut.

E. Worm to be hardened alloy steel with thread ground and polished.

F. Reduction gearing to run in a proper lubricant.

G. Provide gear operators with position indicators, where specified, to show the position of the valve disc or plug.

H. Operators to be galvanized and painted the same color as the valve and associated pipeline.

I. Buried valves to have 2-inch x 2-inch square operating nut.

J. Above-ground valves to have handwheel operators.

2.4 VALVE BOXES

A. Buffalo two-piece sliding type, cast iron, with 5-1/4-inch shaft of appropriate length for the installation.

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7/3/19 Manually Operated Valves

B. The word WATER shall be cast into the top of the lid.

C. Extension pieces, if required, shall be the manufacturer's standard type.

D. Manufacturers: Mueller H-10364, Clow Corporation F-2452, or equal.

E. Furnish units complete with all necessary bases and accessories.

2.5 EXTENSION STEMS FOR VALVE OPERATORS

A. Where the depth of the valve is such that its centerline is more than 4 feet below grade, provide operating extension stems to bring the operating nut to a point 6 inches below the surface of the ground and/or box cover.

B. Constructed of steel.

C. Complete with 2-inch square operating nut.

D. Bolt to valve stem to prevent separation.

2.6 GATE VALVES

A. Acceptable Manufacturers:

1. Mueller, Model No. A-2360.

2. American Flow Control, Product Series 500.

B. Gate Valves:

1. Resilient seat type in accordance with AWWA C509-01 with resilient wedge.

2. Mechanical joint with non-rising stems and two inch square operating nut.

3. Open by turning to the left or counter clockwise.

C. Gate Valve Body and Bonnet:

1. Cast iron.

2. Conform to ASTM A126, Class B.

3. "O" ring type seals and smooth unobstructed waterway when in fully open position.

4. Mechanical joint ends underground; flange joint ends above ground.

2.7 TAPPING SLEEVES AND VALVES

A. Acceptable Manufacturers:

1. Mueller; Product H-615.

2. Or equal.

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7/3/19 Manually Operated Valves

B. Resilient seat or resilient wedge with a flange on one side for connection to the tapping sleeve.

PART 3. EXECUTION

3.1 GENERAL

A. Bolt holes of flanged valves shall straddle the vertical centerline of the pipe run.

B. Prior to installing flanged valves, the flange faces shall be thoroughly cleaned.

C. After cleaning, insert gasket and bolts, and tighten the nuts progressively and uniformly.

D. If flanges leak under pressure, loosen or remove the nuts and bolts, reseat or replace the gasket, retighten or reinstall the nuts and bolts, and retest the joints.

E. Joints shall be watertight at test pressures before acceptance.

F. Thoroughly clean threads of screwed joints by wire brushing, swabbing, or other approved methods.

G. Apply approved joint compound to threads prior to making joints.

H. Joints shall be watertight at test pressures before acceptance.

3.2 PLACEMENT OF VALVES

A. Buried valves shall be installed with valve boxes in accordance with the details shown on the Drawings.

B. Buried valves shall have bolts protected by wrapping in polyethylene material.

3.3 ACCESS

A. Location of valves shall be as required to provide accessibility for control and maintenance.

3.4 TESTING

A. Valves: Test at same time adjacent pipeline is tested.

B. Joints shall show no visible leakage under test.

C. Repair joints that show signs of leakage prior to final acceptance.

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7/3/19 Manually Operated Valves

D. If there are any special parts of control systems or operators that might be damaged by the pipeline test, they shall be properly protected. The Contractor will be held responsible for damage caused by the testing.

E. Valve manufacturer shall furnish an affidavit stating the materials options furnished comply with these and other referenced Specifications.

END OF SECTION

18-5787 02200 7/3/19 Site Preparation

SECTION 02200

SITE PREPARATION

A. Remove interfering or objectionable material from designated areas of Work.

B. Preserve vegetation and existing objects designated to remain from injury or defacement.

C. Cut trees only at direction of Engineer.

D. Contractor shall be responsible for implementing and following a Storm Water

Pollution Prevention Plan as required by the Arkansas Department of Environmental Quality and in accordance with NPDES ARR150000. The successful Bidder (Contractor) shall develop a Storm Water Pollution Prevention Plan to meet all State and Federal regulations and submit to the Engineer for review and approval prior to commencing work.

1.2 DEFINITIONS

A. Clearing:

1. Cutting, removing, and disposing of trees, snags, stumps, shrubs, brush, limbs, and other vegetative growth.

2. Removing evidence of their presence from the surface, inclusive of sticks and branches greater than 2 inches in diameter or thickness.

3. Removing and disposing of trash piles, rubbish, and fencing.

B. Grubbing:

1. Removing and disposing of wood or root matter below the ground surface remaining after clearing.

2. Includes stumps, trunks, roots, or root systems greater than 2 inches in diameter or thickness to a depth of 18 inches below the ground surface.

C. Stripping: Removing and disposing of organic sod, topsoil, grass and grass roots, and other objectionable material from the areas designated to be stripped that remain after clearing and grubbing.

1.3 RELATED SECTIONS

A. Section 02300 - Earthwork.

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A. Provide materials, suitable and in adequate quantity, required to accomplish Work of this Section.

3.1 PREPARATION

A. Review with Engineer's representative the location, limits, and methods to be used prior to commencing Work under this Section.

3.2 CUTTING TIMBER

A. Exercise care when clearing near the clearing limits to avoid damage to existing trees, vegetation, structures, or utilities which are outside of the clearing limits.

B. Trees shall be leveled into the area to be cleared.

C. Flush cut stumps not designated for grubbing by cutting to within 2 inches of the ground surface.

D. Timber is the property of the Contractor.

E. Dispose of stumps, limbs, brush, snags, non-marketable timber, and other vegetative growth off-site.

3.3 PRESERVATION OF TREES, SHRUBS, AND OTHER VEGETATION

A. Trees, shrubbery, and other vegetation not designated for removal shall be protected from damage.

B. Cut and remove tree branches only where, in the opinion of the Engineer, cutting is necessary to effect construction operation.

C. Remove branches other than those required to effect the Work to provide a balanced appearance of any tree, as approved prior to removal.

D. Treat scars resulting from the removal of branches with an approved tree sealant.

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3.4 CLEARING AND GRUBBING LIMITS

A. Clear and grub areas within the limits of construction.

B. Clear and grub in stages as the construction area is increased to avoid unnecessary clearing and grubbing.

3.5 DISPOSAL OF CLEARING AND GRUBBING DEBRIS

A. Haul the material from the Work site and dispose of in accordance with state, federal, and local laws. Off-site disposal shall be at the Contractor's sole expense.

3.6 AREAS TO BE STRIPPED

A. The exact depth of stripping shall be determined by the Engineer.

B. Topsoil requirements are specified in Section 02300.

C. Strip areas that are cleared and grubbed.

D. Strip areas in stages to avoid unnecessary stripping.

3.7 DISPOSAL OF STRIPPINGS

A. Do not mix strippings with borrow excavation.

B. Stockpile topsoil from the strippings for use in landscape grading.

C. Dispose of excess topsoil.

D. Strippings not suitable for use as topsoil shall become the property of the Contractor and shall be removed from the site.

18-5787 02231 7/3/19 Clearing and Grubbing

SECTION 02231

CLEARING AND GRUBBING

1.1 DESCRIPTION

A. Work shall consist of cutting, removing from the ground, and properly disposing of trees, stumps, hedge, brush, roots, logs, weeds, rubbish, sod refuse dumps, sawdust piles, lumbering slash, and other materials within the designated area.

B. The work shall also include selective clearing, preserving existing vegetation, scalping, and the preservation of objects designated to remain.

1.2 DEFINITIONS

A. Clearing - The removal of all trees, brush, and other objectionable growth, and the removal and disposal of logs, rubbish piles, refuse dumps, sawdust piles, lumbering slash, and other objectionable matter from the surface of the ground in the areas shown on the plans or as designated by the Engineer.

B. Grubbing - The grubbing and removal of all stumps, roots, and other objectionable matter, lying wholly or in part below the surface of the ground.

C. Selective Clearing - The trimming of selected trees and shrubs, the removal from the ground and disposal of logs, root pods, brush, refuse dumps, and other undesirable debris, and the cutting, removal, and disposal of all undergrowth, stumps, and standing trees, except those trees and shrubs designated to be preserved. The selective clearing areas will be shown on the plans.

D. Scalping - Areas not classified as clearing and grubbing and that are within construction limits shall be scalped, if appropriate. Scalping shall include the removal and disposal of material such as saplings less than 4-inches in diameter measured 12-inches above the ground, logs, brush, roots, grass, residue of agricultural crops, refuse dumps, and decayed matter.

E. Clearing and Grubbing Trees - The cutting, grubbing and removal of individual, isolated trees and stumps greater than 4-inches diameter measured 12-inches above the ground as shown on the plans or designated by the Engineer to be removed.

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A. Provide materials suitable and in adequate quantity required to accomplish the work of this Section.

3.1 CONSTRUCTION REQUIREMENTS

A. The project site shall be cleared as defined above, except those objects designated to remain shall be carefully protected from abuse, marring, or damage during construction operations.

B. Trees shall be felled and removed in such a manner as to avoid injury to other trees or objects designated to remain. In case of injury to bark, limbs, or roots of vegetation designed to remain, the Contractor shall repair such damage by corrective pruning or other appropriate methods. Trees or other debris falling outside the construction area shall be removed and disposed of according to these specifications.

C. Holes remaining after removal of trees, stumps, etc. shall be backfilled with material approved by the Engineer and compacted as directed except in areas to be excavated. The Contractor shall complete the operation by blading, bulldozing, or other approved methods so that the site shall be free of holes, ditches, or other abrupt changes in elevations that resulted from the clearing and grubbing operations.

3.2 CLEARING AND GRUBBING

A. The site shall be cleared of stumps, brush, logs, rubbish, trees, and shrubs, with the exception of such trees, shrubs, and areas designed on the plans or by the Engineer for preservation. Grubbing will not be required in areas that will have a fill height of 3-feet or more above disturbed stumps cut within 6-inches of the natural ground.

Sound stumps may be left outside the construction limits when they are severed flush with or below the natural ground, or the slope line in areas to be rounded at the top of the back slopes.

B. Merchantable timber in the clearing area shall become the property of Contractor, unless otherwise provided.

C. When perishable material is burned, it shall be under the constant care of a competent watcher. Burning shall be accomplished at such times and in such manner that the surrounding vegetation, adjacent property, or anything designated

7/3/19 Clearing and Grubbing to remain on the site will not be jeopardized. Upon notice from the Engineer that meteorological conditions render burning undesirable, the Contractor shall cease all burning until notified by the Engineer that meteorological conditions are suitable for a resumption of burning operations.

D. When specified, burning will not be permitted unless the material to be burned is placed in an incineration pit and an acceptable forced are combustion device is used that will minimize the emission of smoke, fly ash, and other pollutants. This device shall be constructed so that the forced are is directed over the fire by plenums or ducts. The use of open fans or mulch blowers will not be permitted.

E. The Contractor shall comply with all Federal, State, County, and City laws, regulations, or ordinances applicable to the disposal of clearing and grubbing material. Materials and debris that cannot be burned shall be removed from the project site and disposed of at locations off the project, outside the limits of view from any public road, street, park, or other public facility. The Contractor shall make all necessary arrangements with the property owner for obtaining suitable disposal locations.

F. Disposal operations and final cleanup of the site, including seeding and stabilization, shall comply with these specification requirements. When requested by the Engineer, the Contractor shall furnish copies of all agreements with property owners.

3.3 SELECTIVE CLEARING

A. This work shall be performed in such a manner as to leave the designated areas in a park-like condition and susceptible to economical mowing. Disposal of all material shall comply with the methods set out in the Clearing and Grubbing requirements.

B. Stumps, trees, and shrubs, except those designated to be preserved, shall be severed flush with or below the ground.

C. Movement and operation of equipment shall be such that roots, branches, and trunks of trees and shrubs selected for retention will not be scarred, broken, or otherwise damaged to the extent that the life of the plant is endangered.

3.4 PRESERVED VEGETATION

A. Trees, shrubs, brush, vines, and other natural perennial vegetation shall be protected in the areas designated as Preserved Vegetation.

B. Areas designated as Preserved Vegetation shall not be used for parking, storage, or other construction support activities that will damage vegetation or compact the soil. Care shall be taken to prevent spills of materials hazardous to vegetation such as oil, hydraulic fluid, salts, etc.. Erosion and sedimentation control shall be such

7/3/19 Clearing and Grubbing that sediment is not deposited in depths greater than 2-inches within any portion of the Preserved Vegetation area.

C. Clearing and grubbing may be required through preserved vegetation areas for drainage outlets, channels, or other required construction.

3.5 SCALPING

A. The Contractor shall scalp areas where excavation or embankment is to be made, except that mowed sod need not be removed where the embankment to be constructed is more than 3-feet in height.

B. All suitable material resulting from the scalping operation shall be placed on finished slopes, adjacent to the area from which it is obtained, after excavation or embankment operations are complete.

C. Unsuitable material shall be disposed of as specified for Clearing and Grubbing.

18-5787 02300 7/3/19 Earthwork

SECTION 02300

EARTHWORK

A. Perform earthwork.

B. Meet requirements for excavation safety, or to facilitate construction due to wet conditions.

C. Perform excavation regardless of type, nature, or condition of materials encountered.

D. Contractor shall make his own estimate of the type and extent of the various materials to be excavated in order to accomplish the work.

E. There will be no extra compensation for dewatering.

A. Section 01001 - Basic Requirements.

B. Section 02200 - Site Preparation.

C. Section 02315 - Trench Excavation, Backfill, and Compacting.

D. Section 02900 - Landscaping.

A. Arkansas Department of Transportation, Standard Specifications for Highway Construction, latest edition.

1. ARDOT Section 303 - Aggregate Base Course.

19428-2959 USA Phone: (610) 832-9585 Fax: (610) 832-9555.

1. ASTM D698 - Test Methods for Moisture-Density Relations of Soils and Soil-

Aggregate Mixtures, Using 5.5 lb Rammer and 12-in. Drop.

2. ASTM D1556 - Test Method for Density of Soil in Place by the Sand-Cone Method.

3. ASTM D1557 - Test Methods for Moisture-Density Relations of Soils and Soil-

Aggregate Mixtures, Using 10 lb Rammer and 18-in. Drop.

4. ASTM D2216 - Method for Laboratory Determination of Water (Moisture)

Content of Soil, Rock, and Soil-Aggregate Mixtures.

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5. ASTM D2922 - Test Methods for Density of Soil and Soil-Aggregate in Place by Nuclear Methods (Shallow Depth).

6. ASTM D3017 - Test Method for Moisture Content of Soil and Soil-Aggregate in Place of Nuclear Methods (Shallow Depth).

C. Occupational Safety and Health Administration (OSHA) Standard for Excavation and

Trenches Safety System, 29 CFR 1926, Subpart P: Excavations.

D. Arkansas Statute 291 of 1993.

1.4 DEFINITIONS

A. Relative Compaction:

1. The ratio, in percent, of the as-compacted field dry density to the laboratory maximum dry density as determined by the Standard Proctor Test, ASTM D698, or as determined by the Modified Proctor Test, ASTM D1557, as applicable.

2. Corrections for oversize material may be applied to either the as-compacted field dry density or the maximum dry density, as determined by the Engineer.

B. Optimum Moisture Content:

1. Moisture content of the material for which the maximum dry density is obtained as determined by ASTM D698 or D1557.

2. Field moisture contents shall be determined on the basis of the fraction passing the 3/4-inch sieve.

C. Completed Course: A course or layer that is ready for the next layer or the next phase of construction.

1.5 SUBMITTALS

A. Submit in accordance with Section 01001.

B. Provide the following:

1. Samples of imported material.

2. Samples of onsite material to be used as fill.

3. Certification that imported materials conform to the Specification requirements along with copies of the test results from a qualified commercial testing laboratory.

4. Proctor curves on fill material as prepared by approved laboratory.

1.6 PROJECT CONDITIONS

A. Beginning work of this Section means acceptance of existing conditions.

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PART 2. PRODUCTS

2.1 FILL

A. Free from roots, organic matter, trash, and debris with maximum particle size of 1-1/2 inches.

B. It is intended that structural backfill material be obtained from on site to the maximum extent possible.

2.2 IMPORTED GRANULAR FILL

A. Provide granular fill beneath structures as noted on Drawings.

B. Imported granular fill to consist of a natural or artificial mixture of gravel and soil mortar, uniformly well graded from coarse to fine.

C. Conform to the ARDOT Section 303 classifications for Class 7 as designated on the

Drawings.

2.3 TOPSOIL

A. Selected topsoil at the site, properly stored and protected, free from roots, sticks, hard clay, and stones which will not pass through a 2-inch square opening.

B. Provide imported topsoil of equal quality if required to accomplish the work.

2.4 COMPACTION EQUIPMENT

A. Provide compaction equipment of suitable type and adequate to obtain the densities specified.

B. Operate compaction equipment in strict accordance with the manufacturer's instructions and recommendations.

C. Hand-operated equipment shall be capable of achieving the specified densities.

2.5 MOISTURE CONTROL EQUIPMENT

A. Provide equipment for applying water of a type and quality adequate for the work; it shall not leak; and be equipped with a distributor bar or other approved device to assure uniform application.

B. Provide equipment for mixing and drying out material consisting of blades, discs, or other approved equipment.

2.6 WATER REMOVAL EQUIPMENT

A. Provide and operate equipment adequate to keep excavation and trenches free of water.

2.7 IMPORTED MATERIAL ACCEPTANCE

A. Import only if insufficient material is available on-site.

B. Locate and arrange use of a site near the construction area for obtaining borrow material.

C. Additional tests required at the borrow area:

1. Standard Proctor.

2. Remolded permeability.

3. Atterberg limits.

D. Upon completion of removal of borrow material, grade the site to drain, place topsoil on disturbed areas, and establish grass as outlined in Section 02900.

E. Cost for testing and imported material shall be the responsibility of the Contractor.

2.8 SELECTED MATERIAL ACCEPTANCE

A. Provide samples for testing representative of the actual material to be installed in the work. Take samples from each 2,000 cubic yards of material stockpiled. Depending on the uniformity of the material, Engineer may request more frequent samples.

B. Forward test results to the Engineer at least 10 days before the material is required for use. If tests indicate that the material does not meet Specification requirements, the material shall not be installed in the work.

C. Material which is placed in the work but does not conform to the Specification requirements shall be removed and replaced at the Contractor's sole expense.

3.1 CLEARING AND GRUBBING

A. Complete clearing and grubbing work as specified in Section 02231 prior to beginning work in this Section.

3.2 STRIPPING TOPSOIL

A. Remove existing grass and overburden before excavating topsoil.

B. Prior to beginning excavation or fill, strip the topsoil to a depth of at least 6 inches or to a depth sufficient to remove organic material and stockpile for future use.

C. In general, remove topsoil where structures are to be built, trenches dug, and roads, parking lots, walks, and similar improvements constructed within the areas presently covered with topsoil.

D. Store topsoil clear of the construction area.

E. Take reasonable care to prevent the topsoil from becoming mixed with subsoil or eroding.

3.3 STRUCTURAL EXCAVATION

A. Contractor shall be solely responsible for trench and excavation safety systems in accordance with ACT 291 of 1993 and OSHA requirements.

B. Identify required lines, levels, and grades.

C. Identify known underground utilities. Contractor will be responsible for locating utilities.

D. The method of excavation is optional, however, no equipment shall be operated in a manner that will endanger existing structures and their integrity.

E. Use excavation support system such as sheet piling where ever necessary.

F. Allow for forms, working space, granular base, and finish topsoil where shown on

Drawings or required.

G. Do not carry excavation for footings and slabs deeper than the elevation shown on Drawings after allowing for base material. Excavation of material to depths below the grades indicated, unless so directed by the Engineer or Owner’s representative, will be deemed unauthorized excavation.

H. If undercutting occurs below the planned dirt grade, the same fill material as specified for backfill shall be placed and compacted to 100 Percent Standard Proctor Density as defined in this Section up to the planned dirt grade in 8 inch lifts, at no additional cost to the Owner. Do not attempt to over compact excessively wet soil.

Allow to dry first by scarifying and aerating before remolding.

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3.4 DEWATERING EXCAVATION

A. Remove water during periods when concrete is being deposited, pipe is being laid, and placing of backfill unless water settling is required, and at other times as required for efficient and safe execution of the work.

B. Accomplish removal of groundwater in a manner that will preserve the strength of the foundation soils, will not cause instability of the excavation slopes, and will not result in damage to existing structures.

C. Where necessary to these purposes, lower the water level in advance of excavation, utilizing wells, well points, or similar methods.

D. Maintain the water level in the gravel stratum as measured in piezometers, a minimum of 3 feet below the prevailing excavation level or as needed to prevent bottom heave of the excavation.

E. Open pumping, sumps, and ditches: If these result in boils, loss of fines, softening of the ground or instability of slopes, areas shall not be accepted.

F. Install wells and well points with suitable screens and filters so that continuous pumping of fines does not occur.

G. Operate well points continuously to prevent boils and loss of consolidation.

H. Arrange discharge to facilitate collection of samples by Engineer.

I. Avoid settlement or damage to adjacent property.

J. Dispose of water in a manner that will not damage adjacent property, as approved.

3.5 GRANULAR FILL MATERIAL UNDER FACILITIES

A. Place fill granular material as specified in this Section within the influence area beneath slabs, walks, structures, roads, and parking areas, and as shown on the Drawings.

B. Do not exceed loose lifts of 6 inches.

C. Compact each lift to not less than 95 Percent Modified Proctor Density.

D. Place and compact a 6-inch layer of granular fill to at least 95 Percent Modified

Proctor density immediately beneath spread footings, slabs on grade, or other concrete structures.

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E. Moisten material as required to aid compaction (± 2 percent optimum moisture).

F. Place material in horizontal lifts and in a manner to avoid segregation.

G. Correct and repair subsequent damage to slabs, piping, concrete structures, facilities, or other structures caused by settlement of fill material.

3.6 BACKFILL AND STRUCTURES

A. Remove form materials and trash from excavation before placing backfill.

B. Do not operate earth-moving equipment within 5 feet of walls of concrete structures for the purpose of depositing or compacting backfill material.

C. Compact backfill adjacent to concrete walls with hand-operated tampers or similar equipment that will not damage the structure.

D. Backfill water-holding basins only after satisfactory leakage tests have been conducted.

E. Place earth fill in areas not designated to be structural fill or granular fill.

F. Deposit material in maximum 6-inch loose lifts, and compact each lift to not less than

95 Percent Standard Proctor.

3.7 FILL NOT BENEATH STRUCTURES OR FACILITIES

A. Place earth fill to the lines and grades shown.

B. Place fill material in maximum 6-inch loose lifts and compact each lift to not less than 95 Percent Standard Proctor.

C. Make proper allowance for topsoil where required.

3.8 MOISTURE CONTROL

A. During compacting operations, maintain optimum practicable moisture content required for compaction purposes in each lift of fill.

B. Maintain moisture content uniform throughout the lift.

C. Add water to the material at the site of excavation. Supplement, if required, by sprinkling the fill.

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D. At the time of compaction, maintain the water content of the material at optimum moisture content, plus or minus 2 percentage points, except as otherwise specified for embankments.

E. Do not attempt to compact fill material that contains excessive moisture.

F. Aerate material by blading, discing, harrowing, or other methods, to hasten the drying process.

3.9 FIELD DENSITY TESTS

A. Test Methods: ASTM D2922, D1556, D2216, and D3017.

B. Cooperate with testing work by leveling small test areas designated by the Engineer.

C. Backfill test areas.

D. Field density test shall be performed for every 3,000 cubic yards of fill material placed.

E. Engineer may order testing of lift of fill at any time, location, or elevation.

3.10 SITE GRADING

A. Perform earthwork to lines and grades as shown on Drawings with proper allowance for topsoil where specified or shown on Drawings.

B. Shape, trim, and finish slopes to conform with the lines, grades, and cross sections shown.

C. Slopes shall be free of loose exposed roots and stones exceeding 3-inch diameter.

D. Round tops of banks to circular curbs, in general, not less than a 6-foot radius.

E. Neatly and smoothly trim rounded surfaces; over-excavating and backfilling to the proper grade are not acceptable.

F. Finished site grading shall be reviewed by the Engineer.

3.11 DISPOSAL OF EXCESS EXCAVATION

A. Dispose of excess excavated materials, not required or suitable for use as backfill or fill, outside of the area of work.

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B. Compact excess material as specified for fill, dress the completed disposal area to slopes no greater than 4:1 (horizontal:vertical), and slope to drain.

3.12 SETTLEMENT

A. Settlement in backfill, fill, or in structures built over the backfill or fill, that may occur within the 1-year guarantee period in the General Conditions shall be considered to be caused by improper compaction methods.

B. Restore structures damaged by settlement to original condition.

18-5787 02315 7/3/19 Trench Excavation, Backfill, and Compacting

SECTION 02315

TRENCH EXCAVATION, BACKFILL, AND COMPACTING

A. Work of this Section also includes:

1. Replacing topsoil that contains regenerative material.

2. Disposal of trees, stumps, brush, roots, limbs, and other waste materials from clearing operations.

3. Imported topsoil.

4. Crush rock backfill required by over-excavation.

5. Imported pipe zone material.

6. Trench settlement repair, including replacing roadway surfacing, sidewalk, or other structures.

7. Replacing damaged culverts.

B. Trench excavation is classified as common excavation and includes removal of material of whatever types encountered including rock to depths shown or as directed by Engineer.

C. Pipe zone includes full width of excavated trench from bottom of pipe to a point

6 inches above top outside surface of pipe barrel.

D. Conform to federal, state, and local codes governing safe loading of trenches with excavated material.

E. The right is reserved to modify the use, location, and quantities of the various types of backfill during construction as Engineer considers to be in the best interest of Owner.

F. There shall be no extra compensation for dewatering and rock excavation.

A. Section 02515 - Polyvinyl Chloride (PVC) Pipe and Fittings.

A. Arkansas Department of Transportation, P.O. Box 2261, Little Rock, Arkansas 72203, latest edition.

1. ARDOT 303 - Aggregate Base Course.

7/3/19 Trench Excavation, Backfill, and Compacting

B. ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA, 19428-2959.

1. ASTM D448 - Classifications for Standard Sizes of Aggregate and Bridge

Construction.

2. ASTM D698 - Test Methods for Moisture-Density Relations of Soils and Soil-

Aggregate Mixtures, Using 5.5-lb. (2.49-kg.) Rammer and 12-inch (304.8-mm) Drop.

3. ASTM D1557 - Test Methods for Moisture-Density Relations of Soils and Soil- Aggregate Mixtures, Using 10-lb. (4.54-kg.) Rammer and 18-inch (457-mm) Drop.

4. ASTM D2487 - Standard Classification of Soils for Engineering Purposes.

5. ASTM D2922 - Test Methods for Density of Soils and Soil-Aggregates in Place by

Nuclear Method.

C. Occupational Safety and Health Administration (OSHA) Standard for Excavation and Trenches Safety System, 29 CFR 1926, Subpart P: Excavations.

D. The Contractor shall be solely responsible for trench and excavation safety systems in accordance with Act 291 of 1993.

2.1 FOUNDATION STABILIZATION

A. Crushed gravel or crushed rock, free from dirt, clay balls, or organic material, well graded from coarse to fine, containing sufficient finer material for proper compaction, and meeting ASTM D448 Size No. 67 (Concrete Aggregate).

2.2 PIPE ZONE MATERIAL

A. Select material shall consist of fine loose earth or sand free from clods or rocks larger than 3/4 inches in dimension and of proper moisture content for maximum consolidation.

B. Crushed granular material conforming to ASTM D448, Size No. 67.

C. Washed stone bedding size 1/4-inch to 3/4-inch.

2.3 COMMON FILL MATERIALS

A. Material shall not contain pieces larger than 3 inches, and shall be free of roots, debris, or organic matter.

2.4 SELECT FILL MATERIALS

A. Class 7, Class 3, and Class 4 as established by Section 303 of Arkansas Department of Transportation Standard Specifications for Highway Construction.

B. ASTM Soil Classification GC as set forth in ASTM Designation D2487-92. On site material may be used, provided it is in accordance with ASTM D2487-92.

2.5 BEDDING MATERIAL

A. Pea gravel, sand, or other locally available bedding material, as approved.

2.6 TRENCH BACKFILL

A. Granular Backfill:

1. Natural or artificial mixture of gravel and soil mortar uniformly well graded from coarse to fine.

2. ARDOT Section 303 Class 3, Class 4, or Class 7 as specified in this Section.

2.7 PVC WATER AND SEWER PIPE TRENCH

A. See Drawings for trench details.

2.8 COMPACTION EQUIPMENT

A. Suitable type and adequate to obtain the amount of compaction specified.

B. Operate in strict accordance with manufacturer's instructions and recommendations and maintain in such condition so that it will deliver manufacturer's rated compactive effort.

2.9 IMPORTED TOPSOIL

A. Suitable sandy loam from an approved source.

B. Must possess friability and a high degree of fertility.

C. Free of clods, roots, gravel, and other inert material.

D. Free of quackgrass, horsetail, and other noxious vegetation and seed.

7/3/19 Trench Excavation, Backfill, and Compacting

A. Where clearing or partial clearing of right-of-way is necessary, complete prior to start of trenching.

B. Cut trees and brush as near to surface of ground as practicable, remove stumps, and pile for disposal.

C. Do not permit excavated materials to cover brush or trees prior to disposal.

3.2 PREVENT TRENCH WATER AND ANIMALS FROM ENTERING PIPE

A. When pipe laying is not in progress, including noon hours, open ends of pipe shall be closed; and no trench water, animals, or foreign material shall be permitted to enter the pipe.

3.3 DISPOSAL OF CLEARED MATERIAL

A. Dispose of material in such a manner to meet requirements of state, county, and local regulations regarding health, safety, and public welfare.

B. Dispose of nonflammable and flammable material off the construction site in an approved location.

C. Do not leave material on the Project site, shove onto abutting private properties, or bury in embankments or trenches.

3.4 REMOVAL OF OBSTRUCTIONS

A. Remove obstructions within trench area or adjacent thereto such as tree roots, stumps, abandoned piling, logs, and debris.

B. Engineer may, if requested, make changes in the trench alignment to avoid major obstructions, if such alignment changes can be made within the easement or right-of-way without adversely affecting the intended function of the facility.

C. Dispose of obstructions in accordance with this Section.

3.5 REMOVAL AND REPLACEMENT OF TOPSOIL

A. Where trenches cross lawns, garden areas, pasturelands, cultivated fields, or other areas on which reasonable topsoil conditions exist, remove topsoil for a depth of 6 inches for full width of trench to be excavated.

B. Use equipment capable of removing a uniform depth of material.

C. Stockpile removed topsoil at regular intervals, and do not mix with other excavated

D. Locate stockpiles so that material of one ownership is not transported and stockpiled on property of another ownership.

E. Minimum finished depth of topsoil over trenches: 5 inches.

F. Imported topsoil may be substituted for stockpiling and replacing topsoil.

G. Maintain finished grade of topsoil level with area adjacent to trench until final acceptance by Engineer.

H. Repair damage to adjacent topsoil caused by work operations.

1. Remove rock, gravel, clay, and other foreign materials from the surface.

2. Regrade.

3. Add topsoil as required.

3.6 TRENCH WIDTH

A. Minimum width of unsheeted trenches where pipe is to be laid shall be 18 inches greater than the outside diameter of the pipe, or as approved.

B. Maximum width at top of trench will not be limited, except where excess width of excavation would cause damage to adjacent structures or property or cause undue stresses on the pipe.

C. Confine trench widths to dedicated rights-of-way or construction easements, unless special written agreements have been made with affected property owner.

3.7 EXCAVATION

A. Excavate trench to lines and grades shown or as established by Engineer with proper allowance for pipe thickness and for pipe base or special bedding when required.

B. If trench is excavated below required grade, correct with foundation stabilization

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7/3/19 Trench Excavation, Backfill, and Compacting

C. Place material over full width of trench in compacted layers not exceeding 6 inches deep to established grade with allowance for pipe base or special bedding.

3.8 PREPARATION OF TRENCH - LINE AND GRADE

A. Do not deviate more than ½ inch from line or ½ inch from grade. Measure for grade at the pipe invert, not at the top of the pipe, because of permissible variation in pipe wall thickness.

B. Grade the bottom of the trench by hand to the line and grade where the pipe is to be laid, with proper allowance for pipe thickness and for pipe base when specified or indicated.

C. Remove hard spots that would prevent a uniform thickness of bedding.

D. Check the grade with a straightedge and correct irregularities found.

E. The trench bottom shall form a continuous and uniform bearing and support for the pipe at every point between bell holes, except that the grade may be disturbed for the removal of lifting tackle.

3.9 SHORING, SHEETING, AND BRACING OF TRENCHES

A. Sheet and brace trench when necessary to prevent caving during excavation in unstable material or to protect adjacent structures, property, workers, and the public.

B. Increase trench widths accordingly by the thickness of the sheeting.

C. Maintain sheeting in place until pipe has been placed and backfilled at pipe zone.

D. Remove shoring and sheeting as backfilling is done in a manner that will not damage pipe or permit voids in backfill.

E. Conform to safety requirements of federal, state, or local public agency having jurisdiction for sheeting, shoring, and bracing of trenches; the most stringent of these requirements shall apply.

3.10 LOCATION OF EXCAVATED MATERIALS

A. Place excavated material only within construction easement, right-of-way, or approved working area.

B. Do not obstruct private or public traveled roadways or streets.

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3.11 REMOVAL OF WATER

A. Provide and maintain ample means and devices to promptly remove and dispose of water entering trench during time trench is being prepared for pipe laying, during laying of pipe, and until backfill at pipe zone is completed.

1. These provisions apply during the noon hour as well as overnight.

2. Provide necessary means and devices, as approved, to positively prevent under water from entering the construction area of another contractor.

B. Dispose of water in a manner to prevent damage to adjacent property.

C. Drainage of trench water through the pipeline under construction is prohibited.

3.12 FOUNDATION STABILIZATION

A. When existing material in bottom of trench is unsuitable for supporting pipe, excavate unsuitable material.

B. Backfill trench to subgrade of pipe base with foundation stabilization material

C. Place foundation stabilization material over the full width of trench and compact in layers not exceeding 6 inches deep to required grade by making passes with a vibratory compactor (or equivalent).

D. Material shall be considered unsuitable when it contains more than 5 percent organic material by volumetric sampling or when it will not support a reading of 1.5 on a hand penetrometer.

3.13 ROCK IN PIPE TRENCH

A. Where rock is encountered in bottom of trench, support pipe on bedding material.

B. Minimum Bedding Thickness: Minimum of 4 inches or one eighth of the outside diameter of pipe, whichever is greater.

C. Extend bedding up pipe sides one sixth of outside diameter of the pipe, minimum.

D. Backfill over pipe according to pipe zone type.

3.14 PIPE ZONE BACKFILL

A. Depth of the pipe zone above pipe barrel varies with pipe material.

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7/3/19 Trench Excavation, Backfill, and Compacting

B. Particular attention must be given to area of pipe zone from flow line to centerline of pipe to ensure firm support is obtained to prevent lateral movement of pipe during final backfilling of pipe zone.

C. Backfill area of pipe zone from bottom of pipe to horizontal centerline of pipe by hand-placing material around pipe in 4-inch layers.

D. Achieve continuous support beneath pipe haunches by "walking in" and slicing with shovel.

E. Backfill area of pipe zone from horizontal centerline to top of pipe zone with pipe zone material as determined by class of backfill.

F. In lieu of selected material for pipe zone in upper portion of pipe zone, imported pipe zone material approved by Engineer for trench backfill may be substituted.

G. If the Engineer determines that the existing material is insufficient or unsuitable at trench side for selected material for pipe zone in upper portion of pipe zone, provide suitable material from other trench excavation along pipeline or imported pipe zone

3.15 TRENCH BACKFILL ABOVE PIPE ZONE

A. When backfill is placed mechanically, push backfill material onto slope of backfill previously placed and allow to slide down into trench.

B. Do not push backfill into trench in such a way as to permit free fall of material until at least 2 feet of cover is provided over top of pipe.

C. Under no circumstances allow sharp, heavy pieces of material to drop directly onto pipe or tamped material around pipe.

D. Do not use backfill material of consolidated masses larger than ½ cubic foot.

3.16 EXCESS EXCAVATED MATERIAL

A. Dispose of excess excavated material off project site in an approved area.

3.17 DRAINAGE CULVERTS

A. Replace drainage culverts which are removed on near right angles to pipe centerline.

B. If pipe cannot be reused or is damaged during removal, dispose of it and provide new pipe.

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C. Protect culverts from damage or restore to equivalent condition.

D. Replace culverts to existing lines and grades.

E. Do not replace culverts until proposed pipeline is installed and backfill of trench has been completed to subgrade of culvert.

3.18 PIPE COVER

A. Place select material from excavation over pipe to provide minimum coverage, as shown on Drawings or as directed by Engineer.

3.19 DRAINAGE DITCH RESTORATION

A. Undercrossings of minor drainage ditches not covered in another Specification Section shall be backfilled so that upper 1 foot of material in ditch between ditch banks is clay.

B. Compact material for full ditch width by 6 passes of vibratory compactor (or equivalent).

C. Where indicated on Drawings, provide concrete arch, and/or riprap on ditch banks.

3.20 SETTLEMENT

A. Correct settlement noted in backfill, fill, or in structures built over backfill or fill within warranty period.

3.21 IMPORTED TOPSOIL

A. Should regenerative material be present in soil, remove both surface and root which appears in within 1 year following acceptance of Project in a manner satisfactory to Owner.

18-5787 02510 7/3/19 Disinfection of Water Distribution System

SECTION 02510

DISINFECTION OF WATER DISTRIBUTION SYSTEM

1.1 WORK INCLUDED

A. Disinfection of potable water distribution system.

B. Test and report results.

1.2 RELATED WORK

A. Section 02514 - Cement-Lined Ductile Iron Pipe and Fittings.

1. AWWA C651-05- Standard for Disinfecting Water Mains (or latest edition).

2. AWWA: “The Ten States Standards for Water, 2007 Edition or latest version.”

1.4 QUALITY ASSURANCE

A. Testing Laboratory: Arkansas Department of Health.

1.5 REGULATORY REQUIREMENTS

A. Conform to Arkansas Department of Health regulations for Work of this Section.

1.6 PROJECT RECORD DOCUMENTS

A. Submit 3 copies of reports in accordance with Section 01001.

B. Disinfection report; accurately record:

1. Type and quantity of disinfectant used.

2. Date and time of start and completion of disinfectant injection.

3. Test locations.

4. Initial, 24-hour, and 48-hour disinfectant residuals (quantity in treated water) in ppm for each outlet tested.

5. Date and time of start and completion of flushing.

6. Disinfectant residual after flushing in ppm for each outlet tested.

7/3/19 Disinfection of Water Distribution System

C. Bacteriological report; accurately record:

1. Date issued, project name, and testing laboratory name, address, and telephone number.

2. Time and date of water sample collection.

3. Name of person collecting samples.

4. Test locations.

5. Initial and 24 hour disinfectant residuals in ppm for each outlet tested.

6. Coliform bacteria test results for each outlet tested.

7. Certification that water conforms, or fails to conform, to bacterial standards of

Arkansas Department of Health.

8. Bacteriologist's signature.

9. City of Jefferson PWS ID Number is .

1.7 STORAGE AND HANDLING

A. The Contractor is reminded that chlorine is a powerful oxidant and reacts readily with foreign substances.

B. Chlorine compounds shall be handled and stored in accordance with manufacturer's recommendations.

2.1 CALCIUM HYPOCHLORITE

A. Granular form containing 65 percent available chlorine by weight.

2.2 SODIUM HYPOCHLORITE

A. Liquid form containing approximately 5 to 15 percent available chlorine.

A. Verify that piping system has been cleaned, inspected, and pressure tested.

B. Perform scheduling and disinfection activity with startup, testing, adjusting, and balancing, and demonstration procedures, including coordination with related systems.

7/3/19 Disinfection of Water Distribution System

3.2 EXECUTION

A. Provide and attach equipment required to execute Work of this Section.

B. Utilize fire hydrants as blow-off points when possible.

C. Fire hydrants shall not be used for sample points.

D. Sample points constructed shall be a 3/4 inch or 1 inch copper riser pipe that shall extend adequately above the ground surface.

E. During application of chlorine solution, prevent solution from flowing back into the distribution system.

F. Disinfect piping system by one of the two following methods:

1. Continuous Feed Method:

a. Calcium hypochlorite granules may be placed in the water line during installation in accordance with the following table:

OUNCES OF CALCIUM HYPOCHLORITE GRANULES AT BEGINNING OF MAIN AND AT

EACH 500 FOOT INTERVAL

Pipe Diameter, Inches Calcium Hypochlorite Granules, Ounces

4 and smaller 0.5

6 1.0

8 2.0

12 4.0

b. After installation flush water line to remove particulates. Velocity in the water line shall not be less than 2.5 ft./sec.

c. Fill water line with water dosed with chlorine. Chlorine concentration shall not be less than 25 mg/l free chlorine.

d. Retain chlorinated water in water line for 24 hours. Operate valves and hydrants during this time to disinfect.

e. Chlorine residual in water shall not be less than 10 mg/l at the end of the 24 hour period.

2. Slug Method:

a. Place calcium hypochlorite granules in the water line during installation in accordance with the table in paragraph 3.2.F.1.a.

b. After flushing water line to remove particulates, slowly fill water line with water dosed with a 100 mg/l concentration of chlorine.

c. Retain chlorinated water in water line for 3 hours.

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