Div_31.pdf

Lower Rio Grande Flood Control Project Rehabilitation of Hidalgo Protective Levee (Modified Phases I and II) and Banker Floodway South Levee Hidalgo County, Texas

DIVISIONS 31 / 33-

USIBWC Contract No.: IBM09B0003 SITE GRADING

US INTERNATIONAL BOUNDARY & WATER COMMISSION

GOVERNING TECHNICAL SPECIFICATIONS AND PROVISIONS

DIVISIONS 31 / 33 – SITE GRADING

Rehabilitation of Hidalgo Protective Levee (Modified Phases I and II) and Banker Floodway South Levee

DIVISIONS 31 / 33-

USIBWC Contract No.: IBM09B0003 SITE GRADING

This Page Intentionally Blank

Rehabilitation of Hidalgo Protective Levee (Modified Phases I and II) and Banker Floodway South Levee

REMOVING CONCRETE

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SPECIFICATION 31 04 00

This specification includes requirements for breaking, removing, and salvaging or disposing of existing concrete, and includes the following:

1.1 Related Documents, Contract Clauses, & Specifications

1.2 General

2.0 Materials and Equipment (No Requirements Defined for this Specification)

3.0 Construction Methods

4.0 Measurement and Payment

PART 1 - GENERAL

1.1 RELATED DOCUMENTS, CONTRACT CLAUSES, & SPECIFICATIONS

The following may not include all related documents, contract clauses, & technical specifications, and does not relieve the Contractor of the responsibility of performing work associated with this specification in accordance with all terms of the Contract herein.

A. Related documents: As described in paragraph 1.2 of SPECIFICATION 01 01 00.

B. Contract: Section I, 52.236-21“Specifications and Drawings for Construction”

1.2 GENERAL

In general, the Contractor shall break, remove, and salvage or dispose of existing concrete in accordance with the Contract Documents.

PART 2 – MATERIALS & EQUIPMENT (No Requirements Defined for this Specification)

PART 3 – CONSTRUCTION METHODS

The Contractor shall remove existing concrete from locations shown on the plans. The Contractor shall avoid damaging concrete that will remain in place; saw-cut and remove the existing concrete to neat lines; replace any concrete damaged by the Contractor at no expense to the Government. Unless otherwise shown on the plans, the Contractor shall accept ownership and properly dispose of broken concrete in accordance with federal, state, and local regulations.

PART 4 – MEASUREMENT AND PAYMENT

For this Contract, the Work performed by the Contractor under this specification shall not be paid for directly, but shall be considered subsidiary to the various Bid Items under this Contract.

- END OF SPECIFICATION -

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Rehabilitation of Hidalgo Protective Levee (Modified Phases I and II) and Banker Floodway South Levee

PREPARING RIGHT OF WAY

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SPECIFICATION 31 11 00

This specification includes requirements for preparing right of way, and includes the following:

1.1 Related Documents, Contract Clauses, & Specifications

1.2 General

2.0 Materials and Equipment (No Requirements Defined for this Specification)

The following may not include all related documents, contract clauses, & technical specifications, and does not relieve the Contractor of the responsibility of performing work associated with this specification

In general, the Contractor shall prepare the right of way and designated easements for construction operations by removing and disposing of all obstructions when removal of such obstructions is not specifically shown on the plans to be paid under other Specifications.

A. The Contractor shall protect designated features on the right of way and prune trees and shrubs.

Do not park equipment, service equipment, store materials, or disturb the root area under the branches of trees designated for preservation. When shown on the plans, treat cuts on trees with a compliance-confirmed tree wound dressing within twenty (20) minutes of making a pruning cut or otherwise causing damage to the tree. Follow all local and state regulations when burning. If burning of brush is compliance-confirmed, pile and burn at compliance-confirmed locations.

When working in state or national forests, parks, or wildlife refuges coordinate work with state and federal authorities. Testing, removal, and disposal of hazardous materials within the right of way will be in accordance with Contract provisions.

B. The Contractor shall clear areas shown on the plans of all obstructions, except those landscape features that are to be preserved. Such obstructions include but are not limited to remains of houses and other structures, foundations, floor slabs, concrete, brick, lumber, plaster, septic tank

Rehabilitation of Hidalgo Protective Levee (Modified Phases I and II) and Banker Floodway South Levee

USIBWC Contract No.: IBM09B0003 Page 31.11.00 - 2 drain fields, basements, abandoned utility pipes or conduits, equipment, fences, retaining walls, and other items as compliance-confirmed by the COR. Remove vegetation and other landscape features not designated for preservation, curb and gutter, driveways, paved parking areas, miscellaneous stone, sidewalks, drainage structures, manholes, inlets, abandoned railroad tracks, scrap iron, and debris, whether above or below ground. Removal of live utility facilities is not included in this Specification. Remove culverts, storm sewers, manholes, and inlets in proper sequence to maintain traffic and drainage.

C. In areas receiving embankment, the Contractor shall remove obstructions not designated for preservation to two (2) feet below natural ground. In areas to be excavated, remove obstructions to two (2) feet below the excavation level. In all other areas, remove obstructions to one (1) foot below natural ground. When allowed by the plans, cut trees and stumps off to ground level. Plug the remaining ends of abandoned underground structures over three (3) inches in diameter with concrete to form a tight closure. Backfill, compact, and restore areas where obstructions have been removed. Use compliance-confirmed material for backfilling.

D. The Contractor shall accept ownership and dispose of removed materials and debris at locations off the right of way in accordance with local, state, and federal requirements.

4.1 MEASUREMENT

This work will be measured by the acre or by the 100-foot station, regardless of the width of the right of way. The quantity is a plans quantity measurement bid item; the quantity to be paid is the quantity shown in the proposal.

4.2 PAYMENT

The work performed and materials furnished in accordance with this Specification and measured as provided under “Measurement” will be paid for at the unit price bid for “Preparing Right of Way.” This price is full compensation for pruning of designated trees and shrubs; removal, storage and/or disposal of structures and obstructions; backfilling of holes; furnishing and placing concrete for plugs; and equipment, labor, tools, and incidentals. Total payment for Work performed under this Specification will not exceed 10% of the original Contract amount until final acceptance or the initial release of retainage.

The remainder will be paid on the estimate after the partial release of retainage.

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OBLITERATE EXISTING ROAD

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SPECIFICATION 31 12 00

This specification includes requirements for obliterating abandoned or existing roadways, and includes the following:

1.1 Related Documents, Contract Clauses, & Specifications

1.2 General

2.0 Materials and Equipment (No Requirements Defined for this Specification)

The following may not include all related documents, contract clauses, & technical specifications, and does not relieve the Contractor of the responsibility of performing work associated with this specification

B. Contract: Section I clause incorporated by reference at 52.236-21, entitled “Specifications and Drawings for Construction”

In general, the Contractor shall obliterate designated sections of abandoned road for construction operations by removing, disposing, and/or re-grading of all existing roadway materials.

The Contractor shall strip and windrow existing topsoil before shaping operations; remove asphaltic pavement in accordance with applicable item; remove material designated as salvageable in accordance with applicable items; remove abandoned structures unless otherwise shown on the plans; scarify and mix the abandoned roadbed with soil and blade to produce a smooth, uniform appearance; fill, cut, and shape the designated sections of the abandoned road to blend into the surrounding terrain; eliminate ditches except where needed to facilitate drainage; cover disturbed areas with topsoil after shaping operations to facilitate establishment of vegetation.

This work will be measured by the square yard of roadway. The square yard of roadway is calculated by

Rehabilitation of Hidalgo Protective Levee (Modified Phases I and II) and Banker Floodway South Levee

USIBWC Contract No.: IBM09B0003 Page 31.12.00 - 2 the approximate length of roadway times the average width of the roadway. The quantity is a plans quantity measurement bid item; the quantity to be paid is the quantity shown in the plans.

4.2 PAYMENT

The work performed and materials furnished in accordance with the bid item under this Specification, and measured as provided under “Measurement”, will be paid for at the unit price bid for at the unit price bid for “Oblit Exist Roadway.” This price is full compensation for salvaging and replacing topsoil;

stockpiling or disposal of materials; removal of abandoned structures; scarifying, mixing, and shaping abandoned road; shaping for drainage; furnishing and operating equipment, and labor, tools, and incidentals.

Rehabilitation of Hidalgo Protective Levee (Modified Phases I and II) and Banker Floodway South Levee

REMOVE / STOCKPILE EXISTING MATERIALS

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SPECIFICATION 31 14 00

This specification includes requirements for the removal and stockpile of existing materials within the Work area, and includes the following:

1.1 Related Documents, Contract Clauses, & Specifications

1.2 General

2.1 Materials (No Requirements Defined for this Specification)

2.2 Equipment

3.1 Existing Gravel

3.2 Existing Topsoil

3.3 Existing Rock Riprap

The following may not include all related documents, contract clauses, & technical specifications, and does not relieve the Contractor of the responsibility of performing work associated with this specification

In general, the Contractor shall excavate and stockpile various materials for re-use; construct, shape, and rough-in materials in conformance with the required lines, grades, and typical sections as shown on the plans.

PART 2 – MATERIALS & EQUIPMENT

2.1 MATERIALS (No Requirements Defined for this Specification)

2.2 EQUIPMENT

The Contractor shall use equipment that is able to consistently and efficiently produce the desired results.

The Contractor shall perform excavation work to the width and depth shown on the typical sections for the existing type of material shown on the plans:

3.1 EXISTING GRAVEL

A. Scarify. Before scarifying, clean the existing gravel of objectionable materials by blading, Rehabilitation of Hidalgo Protective Levee (Modified Phases I and II) and Banker Floodway South Levee

USIBWC Contract No.: IBM09B0003 Page 31.14.00 - 2 brooming, and/or or other compliance-confirmed methods. Loosen and break existing gravel material, with or without existing asphaltic concrete pavement. Remove asphalt concrete pavement, surface treatment, plant-mix seal, and micro-surfacing when shown on the plans and in accordance with applicable items. Prevent contamination of asphalt material during and after removal. When the existing pavement consists of only a surface treatment, do not remove before scarifying. Scarify existing material for its full width and depth, unless otherwise shown on the plans. Do not disturb the underlying subgrade. Break material into particles of not more than two and one-half (2 ½ ) inches, unless otherwise shown on the plans.

B. Salvaging. Remove the existing gravel material and stockpile. Perform salvage operations without interfering with proper drainage, or the general requirements of the work. Remove scarified material using a method compliance-confirmed by the Government. Keep material free of contamination.

C. Stockpiling. Store salvaged gravel material at a location compliance-confirmed by the

Government. Prepare stockpile sites by removing and disposing of trash, wood, brush, stumps, vegetation, and other objectionable materials. Deliver salvaged material and construct stockpiles

3.2 EXISTING TOPSOIL

A. Scarify. Before scarifying, clean the existing topsoil of objectionable materials by compliance-confirmed methods.

B. Salvaging. Remove the existing topsoil material and stockpile. Perform salvage operations without interfering with proper drainage, or the general requirements of the work. Remove scarified material using a method compliance-confirmed by the Government. Keep material free of contamination.

C. Stockpiling. Store salvaged topsoil at a location compliance-confirmed by the Government.

Prepare stockpile sites by removing and disposing of trash, wood, brush, stumps, vegetation, and other objectionable materials. Deliver salvaged material and construct stockpiles.

3.3 EXISTING ROCK RIPRAP

A. Salvaging. Clean the existing riprap of objectionable material. Remove the existing rock riprap material and stockpile. Perform salvage operations without interfering with proper drainage, or the general requirements of the work. Remove existing rock riprap using a method compliance-confirmed by the Government. Keep material free of contamination.

B. Stockpiling. Store salvaged rock riprap material at a location compliance-confirmed by the

Government. Prepare stockpile sites by removing and disposing of trash, wood, brush, stumps, vegetation, and other objectionable materials. Deliver salvaged material and construct stockpiles.

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This work will be measured by the cubic yard for removal and stockpile of existing gravel and topsoil; by the square yard for removal and stockpile of existing rock riprap. Volumes are computed by the method of average end areas. This is a plans quantity measurement bid item; the quantity to be paid is the quantity shown in the plans. Shrinkage or swelling factors are not considered in determining the calculated quantities shown in the plans

4.2 PAYMENT

For “cubic yard” and “square yard” measurement, the Work performed in accordance with this Specification and measured as provided under “Measurement” will be paid for at the unit price bid for “Remove / Stockpile (Material Specified)”. No additional payment will be made for thickness or width exceeding that shown on the typical sections or provided on the plans for station, square yard, and cubic yard in the original position measurement. This price is full compensation for blading, brooming, scarifying, salvaging, hauling, and stockpiling of materials, and equipment, labor, tools, and incidentals.

No additional payment will be made for thickness or width exceeding that shown on the typical sections or provided on the plans for station, square yard, and cubic yard in the original position measurement.

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Rehabilitation of Hidalgo Protective Levee (Modified Phases I and II) and Banker Floodway South Levee

PROOF ROLLING

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SPECIFICATION 31 81 00

This specification includes requirements for proof rolling earthwork or base to locate unstable areas within the Work area, and includes the following:

1.1 Related Documents, Contract Clauses, & Specifications

1.2 General

2.0 Materials and Equipment

The following may not include all related documents, contract clauses, & technical specifications, and does not relieve the Contractor of the responsibility of performing work associated with this specification

In general, the Contractor shall proof roll all existing materials within the Work area when required or as shown in the plans.

2.1 MATERIALS (No Requirements Defined for this Specification)

2.2 EQUIPMENT

A. Specified Equipment. The Contractor shall furnish rollers that when loaded weigh at least 25 tons. The maximum acceptable load is fifty (50) tons. The Contractor shall provide rollers that meet the following requirements for pneumatic tire rollers:

Pneumatic tire rollers consist of rubber tire wheels on axles mounted in a frame with either a loading platform or body suitable for ballast loading. Arrange the rear tires to cover the gaps between adjacent tires of the forward group. Furnish rollers capable of forward and backward motion.

Select and maintain the operating load and tire air pressure within the range of the manufacturer’s charts or tabulations to attain maximum compaction throughout the lift, as compliance-confirmed.

Furnish the manufacturer’s chart or tabulations showing the contact areas and contact pressures

Rehabilitation of Hidalgo Protective Levee (Modified Phases I and II) and Banker Floodway South Levee

USIBWC Contract No.: IBM09B0003 Page 31.81.00 - 2 for the full range of tire inflation pressures and for the full range of loadings for the particular tires furnished. Maintain individual tire inflation pressures within five (5) pounds per square inch of each other. Provide uniform compression under all tires.

(1) Light Pneumatic Tire. Furnish a unit:

• with at least nine (9) pneumatic tires;

• with an effective rolling width of approximately five (5) feet;

• capable of providing a total uniform load of four and a half (4.5) to nine (9) tons; and

• with tires capable of maintaining a minimum ground contact pressure of forty-five (45} pounds per square inch.

(2) Medium Pneumatic Tire. Furnish a unit:

• with at least seven (7) pneumatic tires;

• with an effective rolling width of approximately seven (7) feet;

• capable of providing a total uniform load of twelve (12) to twenty-five (25) tons; and

• with tires capable of maintaining a minimum ground contact pressure of eighty (80) or ninety (90) pounds per square inch.

(3) Heavy Pneumatic Tire. Furnish a unit:

• with at least four (4) pneumatic-tired wheels mounted on axles carrying at most two

(2) wheels;

• with wheels arranged to carry approximately equal loads on uneven surfaces;

• with a width between eight (8) and ten (10) feet that can turn one hundred eight degrees

(180°) in the crown width;

• capable of providing a total uniform load of at least twenty-five (25) tons;

• with tires capable of maintaining a maximum ground contact pressure of one hundred fifty (150) pounds per square inch; and

• with liquid-filled tires inflated to such a level that liquid will flow from the valve stem when the stem is in the uppermost position.

B. Alternative Equipment. Instead of the specified equipment, the Contractor may, as compliance-confirmed, operate other compaction equipment that produces equivalent results in the same period of time. Discontinue the use of the alternative equipment and furnish the specified equipment if the desired results are not achieved.

The Contractor shall perform proof rolling as required; adjust the load and tire inflation pressures within the range of the manufacturer’s charts or tabulations; make at least two (2) coverages with the proof roller; offset each trip of the roller by at most one (1) tire width; operate rollers at a speed between two

(2) and six (6) miles per hour. If an unstable or non-uniform area is found, the Contractor shall correct the area in accordance with the applicable specifications.

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The work performed by the Contractor under this specification shall not be paid for directly, but shall be considered subsidiary to the various Bid Items under this Contract.

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Rehabilitation of Hidalgo Protective Levee (Modified Phases I and II) and Banker Floodway South Levee

VEGETATION FOR EROSION CONTROL

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SPECIFICATION 31 92 00

This specification includes requirements for temporary and/or permanent vegetative erosion control within the Work area, and includes the following:

1.0 General

2.0 Materials & Equipment

The following may not include all related documents, contract clauses, & technical specifications, and does not relieve the Contractor of the responsibility of performing work associated with this specification

C. Technical Specifications:

• SPECIFICATION 01 57 00 Temporary Erosion, Sedimentation And Environmental Controls

D. References:

• Texas Seed Law

• Texas Pollutant Discharge Elimination System (TPDES) General Permit No. TXR150000

In general, the Contractor shall provide and install temporary or permanent seeding for erosion control as shown on the plans or required by TPDES General Permit No.TXR150000.

2.1 MATERIALS

The Contractor shall provide seeding as per the mixes identified below; the Contractor will submit a Seeding Plan for review and compliance-confirmation by COR. Seed shall incorporate requirements of the project’s geotechnical report and the US Army Corps of Engineers guidelines “Design and Construction of Levees.”

The Contractor shall provide seed from the previous season’s crop meeting the requirements of the Texas Seed Law, including the testing and labeling for pure live seed (PLS = Purity x Germination). The Contractor shall furnish seed of the designated species, in labeled unopened bags or containers to the

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COR prior to planting. The seed shall be used within 12 months from the date of the analysis.

For this project the Contractor will be required to provide Temporary Seed (for off-season) and Permanent Seed; for planting periods for each type see below and Part 3, paragraphs 3.1 and 3.2.

A. Temporary Seed Mix. The Contractor shall use the following seed mix for Temporary Seeding:

• Cool Season, September 1 thru November 30 Oats at 72 lbs seed / acre

• Warm Season, May 15 thru August 31 Foxtail Millet at 34 lbs seed / acre

B. Permanent Seed Mix. The Contractor shall use the following seed mix for Permanent Seeding:

• Green Sprangletop 0.3 lbs. seed/acre

• Sideoats Grama 3.6 lbs. seed/acre

• Plains Bristlegrass 1.2 lbs. seed/acre

• Bouteloua aristidoides manufacturer’s recommendation

• Millet, Oat and Bluestem seed can be added for faster germination.

2.2 EQUIPMENT (No Requirements Defined for this Specification)

3.1 TEMPORARY SEEDING

The Contractor shall be required to provide temporary seeding during periods of May 16 through January

14. The Contractor will return to areas of temporary seeding during the periods of January 15 through May 15 to provide and establish permanent seeding.

3.2 PERMANENT SEEDING

The Contractor shall be required to perform permanent seeding during periods of January 15 through May 15 only. A maintenance period of 120 calendar days will be required to be provided by the Contractor for permanent seeding.

3.3 SEEDING

The Contractor shall cultivate the area to a depth of four (4) inches before placing the seed. When performing permanent seeding after an established temporary seeding, cultivate the seedbed to a depth of four (4) inches or mow the area before placement of the permanent seed. Plant the seed specified and mulch, if required, after the area has been completed to lines and grades as shown on the plans.

The Contractor my choose from the following options for method of seeding:

A. Broadcast Seeding. The Contractor shall distribute the seed or seed mixture uniformly over the areas shown on the plans using hand or mechanical distribution or hydro-seeding on top of the soil. When seed and water are to be distributed as a slurry during hydro-seeding, apply the

Rehabilitation of Hidalgo Protective Levee (Modified Phases I and II) and Banker Floodway South Levee

USIBWC Contract No.: IBM09B0003 Page 31.92.00 - 3 mixture to the area to be seeded within thirty (30) minutes of placement of components in the equipment. Roll the planted area with a light roller or other suitable equipment. Roll sloped areas along the contour of the slopes.

B. Straw or Hay Mulch Seeding. The Contractor shall plant seed according to “Broadcast Seeding” above. Immediately after planting the seed or seed mixture, apply straw or hay mulch uniformly over the seeded area. Apply straw mulch at two (2) to two and a half (2.5) tons per acre. Apply hay mulch at one and a half (1.5) to two (2) tons per acre. Use a tacking method over the mulched area.

C. Cellulose Fiber Mulch Seeding. The Contractor shall plant seed according to “Broadcast

Seeding” above. Immediately after planting the seed or seed mixture, apply cellulose fiber mulch uniformly over the seeded area at the following rates:

• Sandy Soils with slopes of 3:1 or less—two thousand, five hundred (2500) pounds per acre.

• Sandy Soils with slopes greater than 3:1—three thousand (3000) pounds per acre.

• Clay Soils with slopes of 3:1 or less—two thousand (2000) pounds per acre.

• Clay Soils with slopes greater than 3:1—two thousand, three hundred (2300) pounds per acre.

Cellulose fiber mulch rates are based on dry weight of mulch per acre. Mix cellulose fiber mulch and water to make a slurry and apply uniformly over the seeded area using suitable equipment.

D. Drill Seeding. The Contractor shall plant seed or seed mixture uniformly over the area shown on the plans at a depth of one-quarter (1/4) to one-third (1/3) inch using a pasture or rangeland type drill; plant seed along the contour of the slopes.

E. Straw or Hay Mulching. The Contractor shall apply straw or hay mulch uniformly over the area as indicated on the plans; apply straw mulch at two (2) to two and a half (2.5) tons per acre; apply hay mulch at one and a half (1.5) to two (2) tons per acre; use a tacking method over the mulched area. Water the seeded areas at the rates and frequencies as shown on the plans.

3.4 FERTILIZER – Not required under this Contract.

3.5 VEGETATIVE WATERING

The Contractor shall apply water as shown in the plans; furnish and operate equipment to distribute water at a uniform and controllable rate; ensure that watering does not erode soil or plantings; apply water in the required quantity where shown on the plans.

The Work performed for Seeding under this Specification will be measured by the square yard in its final

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USIBWC Contract No.: IBM09B0003 Page 31.92.00 - 4 position. Seeding is a plans quantity measurement bid item; the quantity to be paid is the quantity shown in the proposal. The Work performed for watering under this Specification will be measured by the one thousand (1000) gallon as applied.

4.2 PAYMENT

The work performed and materials furnished in accordance with the various bid items under this Specification, and measured as provided under “Measurement”, will be paid for at the unit price bid for “Seeding (Perm)” and “Seeding (Temp) of seed mixtures specified herein and “Vegetative Watering.”

This price is full compensation for furnishing materials, including water for hydro-seeding and hydro-mulching operations, for furnishing and operating watering equipment and measuring devices, for furnishing and applying water, and for mowing, labor, equipment, tools, supplies, and incidentals.

Fertilizer, if specified, will not be paid for directly but will be subsidiary to the various Bid Items under this Specification.

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PIPE UNDERDRAIN

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SPECIFICATION 33 46 00

This specification includes requirements for installation of pipe underdrains, and includes the following:

1.1 Related Documents, Contract Clauses, & Specifications

1.2 General

2.0 Materials and Equipment (Not Applicable to this Specification)

The following may not include all related documents, contract clauses, & technical specifications, and does not relieve the Contractor of the responsibility of performing work associated with this specification

C. Technical Specifications:

• SPECIFICATION 35 42 00, “Waterway Bank Protection”

D. References:

• American Association of State Highway & Transportation Officials (AASHTO) M036 - 03-UL Standard Specification for Corrugated Steel Pipe, Metallic-Coated, for Sewers and Drains, Single User Digital Publication

• AASHTO M196 – 92-UL Standard Specification for Corrugated Aluminum Pipe for Sewers and Drains, Single User Digital Publication

• AASHTO M252 -09-UL Standard Specification for Corrugated Polyethylene Drainage Pipe, Single User Digital Publication

• AASHTO M278 -02-UL Standard Specification for Class PS46 Poly(Vinyl Chloride) (PVC) Pipe, Single User Digital Publication

• American Society of Testing and Materials (ASTM) D2751 - 05 Standard Specification for Acrylonitrile-Butadiene-Styrene (ABS) Sewer Pipe and Fittings

• ASTM F949 - 06a Standard Specification for Poly(Vinyl Chloride) (PVC) Corrugated Sewer Pipe With a Smooth Interior and Fittings

• Texas Department of Transportation Department Material Specification (DMS)-6200 “Filter Fabric,” August 2004.

• Texas Department of Transportation Department Material Specification (Tex) -406-A, Rehabilitation of Hidalgo Protective Levee (Modified Phases I and II) and Banker Floodway South Levee

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“Material Finer Than 75 mm (No. 200) Sieve in Mineral Aggregates (Decantation Test For Concrete Aggregates),” August 1999

• Tex-413-A “Determining Deleterious Material in Mineral Aggregate,” August 1999

• Tex-523-C “Testing Asphaltic Waterproofing Materials,” August 1999

In general, the Contractor shall install pipe underdrains.

PART 2 – MATERIALS

2.1 MATERIALS

A. Pipe. The Contractor shall furnish the types and sizes of pipe specified on the plans; use only one type of pipe for any underdrain system on the project; use perforated pipe in areas to be drained, and use non-perforated pipe between the perforated pipe and the outfall as follows:

(1) Type 1 - corrugated steel pipe conforming to any type specified in AASHTO M 36, fabricated from corrugated galvanized sheet.

(2) Type 2 - corrugated aluminum pipe conforming to AASHTO M 196, Type I or IA, fabricated from corrugated sheet.

(3) Type 3 - bituminous-coated corrugated steel pipe conforming to the requirements of Type 1 and uniformly coated inside and out with a minimum thickness of five hundredths (0.05) inch with a bituminous material meeting the requirements of Table 1 when tested in accordance with Tex-523-C.

Table 1 Requirements of Bituminous Material

Test Requirements Solubility, % by wt. in trichloroethylene 99.5 min.

Brittleness Pass Flow, in. 0.25 max

(4) Type 4 - bituminous-coated corrugated aluminum pipe conforming to the requirement of

Type 2 and uniformly coated inside and out with a minimum thickness of five hundredths (0.05) inch with a bituminous material meeting the requirements of Table 1 when tested in accordance with Tex-523-C.

(5) Type 5 - acrylonitrile-butadiene-styrene pipe conforming to ASTM D 2751, SDR-35.

Perforations must meet the requirements of AASHTO M 278.

(6) Type 6 - corrugated polyethylene plastic tubing conforming to ASTM M 252.

(7) Type 7 - corrugated polyvinyl chloride (PVC) pipe conforming to ASTM F 949.

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(8) Type 8 - smooth-wall PVC pipe conforming to AASHTO M 278, Class PS 46.

(9) Type 9 - as shown on the plans.

B. Filter Material. The Contractor shall furnish hard, durable, and clean sand, gravel, crushed stone, or crushed shell, unless otherwise shown on the plans, free of clay balls or other organic or deleterious matter as determined by Tex-413-A, that meets the gradation by percent weight specified in Table 2. Do not furnish crushed limestone unless shown on the plans. Use only one type of filter material for any underdrain system on a project.

Table 2

Percent Retained On Sieve (Tex-401-A) Sieve Size

Type A Type B Type C Type D

1-1/2" – – 0–10 3/4" – 0–10 20–40 3/8" – 15–35 – –

No. 4 0–10 35–55 40–60 0–5 No. 8 0–20 No.16 15–50 No. 20 35–651 35–651 35–651 No. 30 40–75 No. 50 75–1001 75–1001 75–1001 70–90 No. 100 90–100

1Of the portion finer than No. 4 sieve.

Loss by decantation as determined by Tex-406-A must not exceed 1% of the material retained on a No. 4 sieve or four percent (4%) of the material passing a No. 4 sieve. Use Type B or Type C filter material around the underdrains unless otherwise shown on the plans. Do not place Type A or Type D filter material within six (6) inches of perforations.

C. Filter Fabric. Filter fabric shall meeet DMS-6200, “Filter Fabric,” Type 1.

D. Riprap. When required, the Contractor shall provide concrete riprap in accordance with

SPECIFICATION 35 42 00, “Waterway Bank Protection”.

2.2 EQUIPMENT (No Requirements Defined for this Specification)

The Contractor shall begin excavation of the trench at the outfall and proceed toward its upper end, following the lines and grades shown on the plans; hold the minimum horizontal limits of excavation for filter material to the dimensions shown in Table 3 or as shown on the plans.

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Table 3 Minimum Horizontal Limits of Excavation for Filler Material

Depth of Trench (ft)

Distance Outside Neat Lines of Pipe Underdrains (ft)

0 to 6 1.00 Over 6 to 10 1.50

Over 10 to 15 2.00 Over 15 2.50

In areas to be drained, the Contractor shall place filter fabric in the bottom and sides of the trench before placing pipe or filter material, as shown in Figure 1; provide enough width of fabric to overlap on top of the filter material; center perforated pipe in the excavated ditch with the perforations below the horizontal axis; join the pipe with appropriate couplers if required; join plastic pipe in accordance with the manufacturer’s recommendations. Do not use tarpaper strips. Before placing filter material, the Contractor shall obtain the COR’s compliance-confirmation of pipe placement; place filter material at least twelve (12) inches above the bottom of the pipe or as shown on the plans. Do not allow filter material to displace the pipe. After placing pipe and filter material, the Contractor shall lap filter fabric over the top of the filter material according to the manufacturer’s recommendation or as shown on the plans.

Figure 1 Installation Process.

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The Contractor shall install non-perforated pipe sections between the perforated pipe and the outfall. The sections of non-perforated pipe do not require filter fabric or filter material. The Contractor shall place compliance-confirmed plugs in the upper ends of all pipe; cover exposed outfall ends with one-half (1/2)-inch galvanized hardware cloth. When required, the Contractor shall provide Class B concrete riprap in accordance SPECIFICATION 35 42 00, “Waterway Bank Protection”, and details shown on the plans; place the riprap to the contour and grade of the embankment slope; cut the pipe to the slope of the riprap; backfill the remainder of the trench with suitable material in layers not to exceed six (6) inches.

The Contractor will be required to provide trench excavation protection for excavations deeper than five

(5) feet.

This work will be measured by the linear foot along the top of the pipe for the length of the floodwall.

(Outfall piping will not be measured and will be considered subsidiary to the Bid Item.) The quantity is a plans quantity measurement bid item; the quantity to be paid is the quantity shown in the plans.

4.2 PAYMENT

The work performed and materials furnished in accordance with the Bid Item under this Specification, and measured as provided under “Measurement”, will be paid for at the unit price bid for at the unit price bid for “Pipe Underdrain” of the type and/or size specified. This price is full compensation for pipe, couplers, plugs, screens, filter material, filter fabric, riprap, excavation, trench excavation protection, backfill, outfall pipe, valves, flap gates, concrete riprap at flapgate or valve inlet / outlet, equipment, labor, materials, tools, and incidentals. Trench excavation protection for excavations deeper than five (5) feet will be subsidiary to the Bid Item.

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