Div32.pdf

Lower Rio Grande Flood Control Project North Banker Floodway Levee Improvements Project Hidalgo County, Texas

DIVISION 32-

USIBWC Contract No.: IBM09B0002 EXTERIOR IMPROVEMENTS

US INTERNATIONAL BOUNDARY & WATER COMMISSION

GOVERNING TECHNICAL SPECIFICATIONS AND PROVISIONS

DIVISION 32 – EXTERIOR IMPVROVEMENTS

DIVISION 32-

USIBWC Contract No.: IBM09B0002 EXTERIOR IMPROVEMENTS

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FLEXIBLE BASE

USIBWC Contract No.: IBM09B0002 Page 32.71.40 - 1 4287-06

Section 32 71 40

PART 1 G E N E R A L

1.01 SECTION INCLUDES

A. This Item shall govern for the delivery, stockpiling and/or the construction of foundation or base courses for Roadway Base, Temporary Roads, Detours, Shoulders, and Driveways as herein specified and in conformity with the typical sections and to the lines and grades shown on the drawings or established by the COR.

1.02 MEASUREMENT AND PAYMENT

A. Measurement. The work performed and materials furnished for payment will be by the cubic yard in the completed and accepted final position. The volume of base course will be computed in place between the original subgrade or subbase surfaces, and the lines, grades and slopes of the accepted base course as shown on the drawings by the method of average end areas. No payment will be made for thickness or width exceeding that shown on the typical section or provided on the drawings. When subgrade is constructed under this Contract, correction of soft spots in the subgrade will be at the Contractor’s expense.

B. Payment. The work performed and materials furnished in accordance with this Item and measured as provided under “Measurement” will be paid for at the unit price bid for Flex Base of the type and grade specified on the drawings. This price is full compensation for furnishing materials, temporary stockpiling, assistance provided in stockpile sampling and operations to level stockpiles for measurement, loading, hauling, delivery of materials, spreading, blading, mixing, shaping, placing, compacting, reworking, finishing, correcting locations where thickness is deficient, curing, and equipment, labor, tools, and incidentals.

C. Refer to Section 01 27 00 – Measurement and Payment for unit price procedures.

1.03 REFERENCES

A. ASTM C 131 - Standard Test Method for Resistance to Degradation of Small-Size Course Aggregate by

Abrasion and Impact in the Los Angeles Machine.

B. ASTM D 1556 - Density of Soil in Place by the Sand-Cone Method.

C. ASTM D 1557 - Moisture-Density Relations of Soils and Soil-Aggregate Mixture Using 10 lb Rammer and

18" Drop.

D. ASTM D 2922 - Test Methods for Density of Soil and Soil-Aggregate in Place by Nuclear Methods

(Shallow Depth).

E. ASTM D 361 - Test Method for Water Content of Soils and Rock in Place by Nuclear Methods (shallow depth).

F. ASTM D 3017 - Test Method for Water Content of Soils and Rock in Place by Nuclear Methods.

G. ASTM D 4318 - Test Method for Liquid Limit, Plastic Limit, and Plasticity Index of Soils.

H. TxDOT Tex-101-E - Preparation of Soil and Flexible Base Materials for Testing.

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I. TxDOT Tex-110-E - Determination of Particle Size Analysis of Soils.

J. TEXAS DEPARTMENT OF TRANSPORTATION STANDARD SPECIFICATIONS FOR

CONSTRUCTION OF HIGHWAYS, STREETS AND BRIDGES

1.04 SUBMITTALS

A. Submittals shall conform to requirements of Section 01 33 00 - Submittal Procedures.

B. Submit samples of flexible base course and soil binder for testing.

1.05 TESTS

A. Testing of flexible base materials shall be in accordance with the following Texas Department of

Transportation standard laboratory test procedures:

Moisture Content Tex-103-E Liquid Limit Tex-104-E Plasticity Index Tex-106-E Bar Linear Shrinkage Tex-107-E, Part II Sieve Analysis Tex-110-E Moisture-Density Determination Tex-113-E Roadway Density Tex-115-E Wet Ball Mill Tex-116-E Triaxial Tests Tex-117-E (Part I or II as selected by the COR) Particle Count Tex-460-A, Part I

Samples for testing the base material for triaxial class, soil constants, gradation and wet ball mill will be taken prior to the compaction operations.

1.06 DELIVERY, STORAGE, AND HANDLING

A. Provide materials from stockpiles that are protected during storage from contaminates that would be detrimental to the flexible base course.

B. Load materials from same area of stockpile to maintain uniformity of each successive delivery to the project site.

C. Roadway Delivery. It shall be the responsibility of the Contractor to deliver the required amount of base material to each 100 foot station. All processing or manipulations will be in accordance with the applicable bid items.

D. Stockpile Delivery. It shall be the responsibility of the Contractor to prepare the stockpile site, to provide and deliver the required amount of base material to the designated stockpile site and to construct the stockpile. Unless otherwise shown on the drawings, the stockpile shall not be less than ten (10) feet in height and shall be made up of layers not to exceed two (2) feet in thickness.

PART 2 P R O D U C T S

2.01 MATERIALS

A. The flexible base material shall be crushed or uncrushed as necessary to meet the requirements herein, USIBWC Contract No.: IBM09B0002 Page 32.71.40 - 3 4287-06 and shall consist of durable coarse aggregate particles and binding materials.

B. General. When off-right-of-way sources are involved, the Contractor's attention is directed to Section 01

14 50 – Use of Premises and Section 01 74 00 – Restoration of Site Improvements.

C. Physical Requirements.

1. All types shall meet the physical requirements for the specified grade(s) as set forth in Table 1.

2. Additives, such as, but not limited to, lime, cement or fly ash, shall not be used to alter the soil constants or strengths shown in Table 1, unless otherwise shown on the drawings.

3. Unless otherwise shown on the drawings, the base material shall have a minimum Bar Linear

Shrinkage of 2 percent as determined by Test Method Tex-107-E, Part II.

4. The flexible base shall be one of the following types, as follows:

a. Type A. As shown on the drawings. Type A material shall be crushed stone produced from oversize quarried aggregate, sized by crushing and produced from a naturally occurring single source. Crushed gravel or uncrushed gravel shall not be acceptable for Type A material. No blending of sources and/or additive materials will be allowed in Type A material.

b. Type B. Type B material shall be crushed or uncrushed gravel.

c. Type C. Type C material shall be crushed gravel. Unless otherwise shown on the drawings, crushed gravel shall have a minimum of 60 percent of the particles retained on the No. 4 sieve with two (2) or more crushed faces as determined by Test Method Tex- 460-A, Part I.

d. Type D. As shown on the plans.

TABLE 1

USIBWC Contract No.: IBM09B0002 Page 32.71.40 - 4 4287-06

PHYSICAL REQUIREMENTS

GRADE 1 GRADE 2 GRADE 3

Triaxial Class 1:

Min. compressive strength, psi: 45 at 0 psi lateral pressure and 175 at 15 psi lateral pressure

Master Grading 1-3/4" 0 7/8" 10-35 3/8" 30-50 No. 4 45-65 No. 40 70-85

Max LL 35

Max PI 10

Wet Ball Mill Max 40

Max increase in passing No. 40 20

Triaxial Class 1 to 2.3:

Min. compressive strength, psi: 35 at 0 psi lateral pressure and 175 at 15 psi lateral pressure

Master Grading 2-1/2" 0 1-3/4" 0-10 No. 4 45-75 No. 40 60-85

Max LL 40

Max PI 12

Wet Ball Mill Max 45

Triaxial Class - Unspecified

Master Grading 2-1/2" 0 1-3/4" 0-10 No. 4 30-75 No. 40 50-85

Wet Ball Mill Max 50

GRADE 4 GRADE 5 GRADE 6

Triaxial Class – Unspecified

Master Grading 1-3/4" 0 No. 4 45-75 No. 40 50-85

Max LL 40

Max PI 12

Triaxial Class – Unspecified

Master Grading 1-3/4" 0 No. 40 50-85

As Shown on the Drawings

Notes:

1. Gradation requirements are percent retained on square sieves.

2. When a magnesium soundness value is shown on the drawings the material will be tested in accordance with Test Method Tex-411-A.

3. When lightweight aggregates are used, the wet ball mill requirements will not apply and the lightweight aggregate shall meet the Los Angeles Abrasion, Pressure Slaking and Freeze Thaw requirements of Texas Department of Transportation Standard Specifications For Constructiono of Highways, Streets, and Bridges, Item 303, "Aggregate for Surface Treatment (Lightweight)".

D. Pilot Grading. When pilot grading is required on the drawings, the flexible base shall not vary from the

USIBWC Contract No.: IBM09B0002 Page 32.71.40 - 5 4287-06 designated pilot grading of each sieve size by more than five (5) percentage points. However, the flexible base grading shall be within the master grading limits as shown in Table 1. The pilot grading may be varied by the COR as necessary to insure that the base material produced will meet the physical requirements shown in Table 1.

E. Unless otherwise shown on the drawings, the limits establishing reasonably close conformity with the specified gradation and plasticity index are defined by the following:

1. Gradation. The COR may accept the material, providing not more than one (1) out of the most recent five (5) consecutive gradation tests performed are outside the specified limits for master grading or pilot grading, as applicable, on any individual sieve by no more than five (5) percentage points.

2. Plasticity Index. The COR may accept the material providing not more than one (1) out of the most recent five (5) consecutive plasticity index samples tested are outside the specified limit by no more than two (2) percentage points.

F. Material Sources.

1. The flexible base material shall be furnished by the Contractor. When a non-commercial source is utilized, it shall be opened in such manner as to immediately expose the vertical faces of all the various strata of acceptable material. Unless otherwise compliance-confirmed by the COR, the material shall be secured and processed by successive vertical cuts extending through all of the exposed strata.

2. Unless otherwise shown on the drawings, the flexible base material shall be temporarily stockpiled prior to delivery to the roadway. Unless other- wise shown on the drawings, the stockpile shall not be less than 10 feet in height and shall be made up of layers not greater than two (2) feet in thickness. After a sufficient stockpile has been constructed the Contractor may proceed with loading from the stockpile for delivery. In loading from the stockpile for delivery, the material shall be loaded by making successive vertical cuts through the entire depth of the stockpile.

3. When temporary stockpiles are to be tested for acceptance prior to delivery to its intended use, any stockpile that has been sampled and accepted shall not have material added or removed unless otherwise compliance-confirmed by the COR. The Contractor will be charged for additional sampling and testing required as a result of material being removed from a previously compliance-confirmed stockpile without the compliance-confirmation of the COR. Such charges will be deducted from the Contractor's estimates.

4. Blending of materials from more than one (1) source to produce Type B, C or D flexible base will be allowed when compliance-confirmed by the COR.

PART 3 E X E C U T I O N

3.01 EXAMINATION

A. Verify compacted subgrade is ready to support imposed loads.

B. Verify lines and grades are correct.

3.02 PREPARATION

A. Complete backfill of new utilities below future grade.

B. Prior to delivery of the base material, the subgrade or existing roadbed shall be shaped to conform to

USIBWC Contract No.: IBM09B0002 Page 32.71.40 - 6 4287-06 the typical sections, shown on the drawings or established by the COR. This work shall be done in accordance with requirements of Section 31 33 00 – Embankment, Section 31 31 50 - Roadway Excavation, Section 31 33 60 - Lime Stabilized Subgrade, and Section 31 33 80, as appropriate.

C. Soft spots shall be corrected as directed by the COR.

D. Correct subgrade deviations in excess of plus or minus 1/2 inch in cross section, or in 16 foot length by loosening, adding or removing material, reshaping and recompacting by sprinkling and rolling.

E. Prepare sufficient subgrade in advance of base course operations.

3.03 PLACEMENT

A. First Course.

1. It shall be the responsibility of the Contractor to deliver the required amount of base material to each 100 foot station. Spread and shape in lifts to compacted thickness not to exceed 6 inches in depth Base material shall be spread uniformly and shaped the same day as delivered.

In the event inclement weather or other unforeseen circumstances render this impractical, the material shall be shaped as soon as practical.

2. Prior to compacting the flexible base, the flexible base material shall be bladed and shaped to conform to the typical sections as shown on the drawings. All areas of segregated coarse or fine material shall be corrected or removed and replaced with well graded material, as directed by the COR and at the Contractor's expense.

3. The Contractor shall sprinkle for dust control as directed by the COR.

B. Succeeding or Finish Courses. Construction methods shall be the same as required for the first course.

Throughout this entire operation, the shape of each course shall be maintained by blading. Upon completion, the surface shall be smooth and in conformity with the typical section as shown on the drawings and the established lines and grades. Prior to placing the surfacing on the completed base, the base shall be cured to the extent directed by the COR.

C. Compaction Method.

1. The flexible base shall be compacted by "Density Control" as shown on the drawings. Water used for compaction shall conform to the material requirements of Section 31 33 90 -Sprinkling.

2. The flexible base shall be sprinkled as required and compacted to the extent necessary to provide not less than 100 percent density as determined by Test Method Tex-113-E, unless otherwise shown on the drawings. After each section of flexible base is completed, tests as necessary will be made by the COR in accordance with Test Method Tex-115-E. When the material fails to meet the density requirements, or it loses the required moisture, stability, density or finish before the next course is placed or the project is completed, it shall be reworked and retested in accordance with Section 3.03 Placement.

D. Reworking a Section. Should the base course, due to any reason or cause, lose the required stability, density or finish before the surfacing is complete, it shall be reworked, recompacted and refinished at the sole expense of the Contractor.

E. Thickness Measurement. When the measurement is by the square yard, the flexible base will be measured for depth in units of 4000 square yards, or fraction thereof. The measurements will be at location(s) determined by the COR and performed in accordance with Test Method Tex-140-E. In any unit where flexible base is deficient by more than 1/2 inch in thickness, the deficiency shall be corrected by scarifying, adding material as required, reshaping, recompacting and refinishing at the Contractor's

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3.04 TOLERANCES

A. Tolerances shall conform to the following:

1. Density Tolerances. The COR may accept the work providing not more than one (1) out of the most recent five (5) consecutive density tests performed is below the specified density, and providing that the failing test is no more than three (3.0) pounds per cubic foot below the specified density.

2. Grade Tolerances. In areas on which surfacing is to be placed, any deviation in excess of 1/4 inch in cross section or 1/4 inch in a length of 16 feet measured longitudinally shall be corrected by loosening, adding or removing material, reshaping and recompacting by sprinkling and rolling.

3.05 FIELD QUALITY CONTROL

A. Testing will be performed under provisions of SPECIFICATION 01 46 00 - Quality Control / Quality

Assurance.

B. A minimum of one core will be taken at random locations per 1,000 linear feet per lane of roadway or 500 square yards of base to determine in-place depth.

C. Contractor may, at his own expense, request additional cores in the vicinity of cores indicating nonconforming in-place depths. If the average of the tests falls below the required depth, place and compact additional material at no additional cost to the Government.

D. Compaction Testing will be performed in accordance with ASTM D 1556 or ASTM D 2922 and ASTM

3017 at a random location near each depth determination core. Rework and recompact areas that do not conform to compaction requirements.

E. Fill cores and density test sections with new compacted flexible base.

3.06 PROTECTION

A. Restrict construction traffic on finished base to equipment required to complete the work.

END OF SECTION

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HYDROMULCH SEEDING

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Section 32 92 10

PART 1 G E N E R A L

1.01 SECTION INCLUDES

A. Restoration of all areas disturbed by construction, except lawns and pavement areas, shall be by Hydromulch Seeding.

1.02 MEASUREMENT AND PAYMENT

A. Unit Prices.

1. Payment for hydromulch seeding is on a square yard basis. Include cost of work performed under this Section in the pay item to which this work pertains.

2. Refer to Section 01 27 00 - Measurement and Payment for unit price procedures.

B. Reserved.

1.03 SUBMITTALS

A. Submittals shall conform to requirements of Section 01 33 00 - Submittal Procedures.

B. Submit certification from supplier that each type of seed conforms to these specifications and the requirements of the Texas Seed Law. Certification shall accompany seed delivery.

C. Submit a certificate stating that fertilizer complies with these specifications and the requirements of the

Texas Fertilizer Law.

PART 2 P R O D U C T S

2.01 MATERIALS

A. Topsoil: Conform to material requirements of Section 31 91 10 - Topsoil.

B. Seed: Conform to U.S. Department of Agriculture rules and regulations of the Federal Seed Act and the Texas Seed Law. Seed shall be certified 90 percent pure and furnish 80 percent germination and meet the following requirements:

1. Rye: Fresh, clean, Italian rye grass seed (lollium multi-florum), mixed in labeled proportions.

As tested, minimum percentages of impurities and germination must be labeled. Deliver in original unopened containers.

2. Bermuda: Extra-fancy, treated, lawn type common bermuda (Cynodon dactylon). Deliver in original, unopened container showing weight, analysis, name of vendor, and germination test results.

3. Wet, moldy, or otherwise damaged seed will not be accepted.

4. Seed requirements, application rates, and planting dates are:

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MIX

APPLICATION RATE

POUNDS/ACRE

PLANTING DATE

Hulled Common Bermuda Grass 98/88 Unhulled Common Bermuda Grass 98/88

Jan 1 to Mar 31

Apr 1 to Sep 30

Unhulled Common Bermuda Grass 98/88 Annual Rye Grass (Gulf)

Oct 1 to Dec 31

C. Fertilizer: Dry and free flowing, inorganic, water soluble commercial fertilizer, which is uniform in composition. Deliver in unopened containers which bear the manufacturers guaranteed analysis.

Caked, damaged, or otherwise unsuitable fertilizer will not be accepted. Fertilizer shall contain minimum percentages of the following elements:

1. Nitrogen: 10 Percent

2. Phosphoric Acid: 20 Percent

3. Potash: 10 Percent

D. Mulch:

1. Virgin wood cellulose fibers from whole wood chips having a minimum of 20 percent fibers

0.42 inches in length and 0.01 inches in diameter.

2. Cellulose fibers manufactured from recycled newspaper and meeting the same fiber content and size as for cellulose fibers from wood chips.

3. Mulch shall be dyed green for coverage verification purposes.

E. Soil Stabilizer: "Terra Tack 1" or compliance-confirmed equal.

F. Weed control agent: Pre-emergent herbicide for grass areas, such as "Benefin," or compliance-confirmed equal.

PART 3 E X E C U T I O N

3.01 PREPARATION

A. Place and compact topsoil in accordance with requirements of Section 31 91 10 - Topsoil.

B. Dispose of Objectionable and Waste Materials in accordance with Section SPECIFICATION 01 57 00

- Temporary Erosion, Sedimentation, and Enviornmental Controls.

3.02 APPLICATION

A. Seed: Apply uniformly at rates given in Paragraph 2.01 B for type of seed and planting date.

B. Fertilizer: Apply uniformly at a rate of 500 pounds per acre.

C. Mulch: Apply uniformly at a rate of 50 pounds per 1000 square feet.

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D. Soil Stabilizer: Apply uniformly at a rate of 40 pounds per acre.

E. Weed Control Agent: Apply at manufacturer's recommended rate prior to hydromulching.

F. Suspend operations under conditions of drought, excessive moisture, high winds, or extreme or prolonged cold.

3.03 MAINTENANCE

A. Maintain grassed areas a minimum of 90 days, or as required to establish an acceptable turf. For areas seeded in the fall, continue maintenance the following spring until an acceptable turf is established.

B. Maintain grassed areas by watering, fertilizing, weeding, and trimming.

C. Repair areas damaged by erosion by regrading, rolling and replanting.

END OF SECTION

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