Revised_35_31_25.pdf

Grand Tower Phs 5 AM0001

SECTION TABLE OF CONTENTS

DIVISION 35 - WATERWAY AND MARINE CONSTRUCTION

35 31 25

RIVER TRAINING STRUCTURES - GRAND TOWER PHASE 5

PART 1 GENERAL

1.1 SCOPE

1.2 MEASUREMENT OF GRADED STONE A

1.2.1 Barge Displacement

1.3 REFERENCES

1.4 DEFINITIONS

1.4.1 Dikes

1.4.2 Revetment

1.4.3 Graded Stone

1.4.4 Weir

1.5 VOLUME TO WEIGHT CONVERSION

1.5.1 Factors Used for Converting In-Place Volume to Weights

1.5.1.1 Revision of Bidding Schedule Quantities

1.6 SUBMITTALS

PART 2 PRODUCTS

2.1 STONE

2.1.1 General

2.1.2 Stone Source

2.1.3 List of Sources

2.1.4 Selection of Source

2.1.5 Acceptance of Source

2.2 Evaluation testing of stone

2.2.1 Approved Sources

2.2.2 Unlisted Sources

2.2.2.1 Evaluation Tests

2.2.2.1.1 Bulk Specific Gravity Range

2.2.2.1.2 Absorption

2.2.2.1.3 Resistance to Freezing and Thawing

2.2.2.1.4 Resistance of Rock to Wetting and Drying

2.2.2.1.5 Samples

2.2.2.1.6 Tests

2.2.3 Gradation Test

2.2.4 Proportional Dimension Limitations

2.3 Graded Stone "A"

PART 3 EXECUTION

3.1 QUALITY CONTROL

3.2 QUALITY ASSURANCE

3.3 RIVER STAGE LIMITATIONS

3.4 ORDER OF WORK

3.5 PLACING STONE

3.5.1 General

SECTION 35 31 25 Page 1

3.5.2 Revetment - Bank Paving

3.5.3 Revetment - Caving Bank

3.5.4 Structure construction

3.5.5 Structure Repairs

3.6 Dike Degradation and Recycle Stone

3.7 SURVEYS

3.8 USING RIVER STAGES TO AID IN LAYOUT

3.9 CONSTRUCTION TOLERANCES

ATTACHMENTS:

GRADATION TEST DATA SHEET

-- End of Section Table of Contents --

SECTION 35 31 25 Page 2

35 31 25

RIVER TRAINING STRUCTURES - GRAND TOWER PHASE 5

PART 1 GENERAL

1.1 SCOPE

This section covers river training structure construction, modification, and repair.

1.2 MEASUREMENT OF GRADED STONE A

1.2.1 Barge Displacement

Stone will be measured for payment, in the presence of the Contracting Officer, by weight determined by barge displacement. Barge Displacement Measurements shall be taken at the job site. Each barge shall be suitably marked with two displacement gaging locations on each side near each end of the barge. Each gaging location shall be marked by a line perpendicular to the edge of the barge, 4 inches wide and 1 foot long, on both the deck and side of the barge. Barges with rakes shall have the displacement gaging lines placed at each corner of the box section between the rakes.

If a barge has a box end or ends, the gaging locations shall be placed approximately 4 feet from the box end(s). The freeboard will be measured at the four gaging locations and the displacement determined by the use of "STANDARD BARGE TABLES" from the average of these measurements. STANDARD BARGE TABLES can be found at:

http://www.mvm.usace.army.mil/About/Offices/ EngineeringandConstruction/ConstructionBranch/BargeIndex.aspx

The displacement will be determined before and after being unloaded and the difference between these values shall be the quantity delivered. All carriers used in transporting stone shall be free of leaks such as would render accurate gauging difficult. Facilities for inspecting the hold of each carrier to determine whether leakage is occurring shall be provided.

Each carrier shall also be provided with adequate pumping facilities, and if water is found to be accumulating in the hold, the carrier shall be pumped dry before each gaging, both before and after unloading. Lightening by pumping or by transfer of crew or supplies will not be permitted while stone is being transferred. Rejected stone and unacceptable material shall be left aboard the barge until after the final readings have been taken.

1.3 REFERENCES

ASTM INTERNATIONAL (ASTM)

ASTM C127 (2012) Standard Test Method for Density, Relative Density (Specific Gravity), and Absorption of Coarse Aggregate

ASTM D3740 (2012a) Minimum Requirements for Agencies Engaged in the Testing and/or Inspection of Soil and Rock as Used in Engineering Design and Construction

SECTION 35 31 25 Page 3

ASTM D4791 (2010) Flat Particles, Elongated Particles, or Flat and Elongated Particles in Coarse Aggregate

ASTM D4992 (2007) Evaluation of Rock to be Used for Erosion Control

ASTM D5312 (2004) Evaluation of Durability of Rock for Erosion Control Under Freezing and Thawing Conditions

ASTM D5313 (2004) Evaluation of Durability of Rock for Erosion Control Under Wetting and Drying Conditions

U.S. ARMY CORPS OF ENGINEERS (USACE)

COE CRD-C 169 (1997) Standard Test Method for Resistance of Rock to Wetting and Drying

1.4 DEFINITIONS

1.4.1 Dikes

The term "dike" applies to types of river training structures that are constructed along the river at an angle to the current. Dikes are constructed of stone or piling. Chevrons, W-dikes, Wing dikes, and Bullnose protection are all considered dikes.

1.4.2 Revetment

The term "revetment" applies to various types of stabilization structures that are constructed along the river's edge. Revetments are constructed of stone.

1.4.3 Graded Stone

Graded Stone is defined as material with gradations that are produced by the mining technique and minimal additional processing other than the use of a skeleton bucket or a bar grizzly.

1.4.4 Weir

The term "weir" applies to a river training structure that is constructed in the river at an angle to the current and is designed to have navigation traffic pass over the top of the structure. Weirs are constructed of stone.

1.5 VOLUME TO WEIGHT CONVERSION

1.5.1 Factors Used for Converting In-Place Volume to Weights

The following factors were used in converting the in-place volume to the quantities shown in the BIDDING SCHEDULE.

SECTION 35 31 25 Page 4

BULK STONE

MATERIAL

SPECIFIC GRAVITY

(SSD)

PERCENT VOIDS CUBIC FEET OF

VOLUME PER TON

INCLUDING

Graded Stone A 2.6 31 18

1.5.1.1 Revision of Bidding Schedule Quantities

The estimated quantities of stone listed in the BIDDING SCHEDULE were computed on the basis of stone having a percentage of voids and a bulk specific gravity (saturated surface dry (SSD) basis) as shown in the above table based on water having a unit weight of 62.4 pounds per cubic foot.

When the bulk specific gravity (SSD) of the stone to be used in the work is other than that shown in the above table, the estimated quantities will be revised by multiplying them by the fraction which results when the bulk specific gravity (SSD) of the stone furnished is divided by the value shown in the above table for each respective stone gradation. Revision for the percentage of voids will likewise be made. The Contracting Officer will issue a modification to the contract in accordance with the Contract Clause, CHANGES, to adjust the estimated quantities in the BIDDING

SCHEDULE.

1.6 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. The following shall be submitted in accordance with SECTION 01 33 00 -

SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals Quality Control Plan; G

SD-03 Product Data Stone Source; G

SD-06 Test Reports Gradation Test; G Unit Weight

Bulk Specific Gravity Absorption

SD-07 Certificates Barge Displacement Measurements

PART 2 PRODUCTS

2.1 STONE

2.1.1 General

All stone shall be durable material as approved by the Contracting Officer.

It shall be free from cracks, blast fractures, bedding, seams and other defects that would tend to increase its deterioration from natural causes.

Inspections for cracks, fractures, seams and defects shall be made by visual examination. If, by visual examination, it is determined that 20 percent or more of the stone produced contains hairline cracks, then all stone produced by the means and measures which caused the fractures shall be rejected. A hairline crack that is defined as being detrimental shall

SECTION 35 31 25 Page 5 have a minimum width of 1/32 inch and shall be continuous for one-third the dimension of at least two sides of the stone. The faces of individual pieces of stone shall be roughly angular, not rounded, in shape. Field stone will not be accepted.

2.1.2 Stone Source

Stone may be furnished from any of the sources listed at the end of Section 00 08 00 - SPECIAL CLAUSES. If the Contractor proposes to furnish stone from a source not currently listed at the end of Section 00 08 00 - SPECIAL CLAUSES, the Government will conduct a quarry investigation and evaluate the quality test data provided by the Contractor to determine whether acceptable stone can be produced from the proposed source. Satisfactory service records on other work may be acceptable. In order for stone to be acceptable on the basis of service records, stone of a similar size must have been placed in a similar thickness and exposed to weathering under similar conditions as are anticipated for this contract, and must have satisfactorily withstood such weathering for a minimum of 5 years. If no such records are available, the Government will conduct tests to assure the acceptability of the stone. In addition to an acceptable 5 year service record, the Contracting Officer has the option to elect to have representative samples taken and tested.

2.1.3 List of Sources

On the basis of information and data available to the Contracting Officer, stone meeting the quality requirements of these specifications has been produced from the sources listed at the end of Section 00 08 00 - SPECIAL

CLAUSES.

2.1.4 Selection of Source

The Contractor shall designate in writing only one source or one combination of sources from which he proposes to furnish stone. If the Contractor proposes to furnish stone from a source not listed at the end of Section 00 08 00 - SPECIAL CLAUSES, he may designate only a single unlisted source for stone and he shall notify the Contracting Officer at least 60 workdays before the stone leaves the quarry. It is the Contractor's responsibility to determine that the stone source or combination of sources selected is capable of providing the quality, quantities and gradation needed and at the rate needed to maintain the scheduled progress of the work. If a source for stone so designated by the Contractor is not accepted for use by the Contracting Officer, the Contractor may not propose other sources but shall furnish the stone from a source listed at the end of Section 00 08 00 - SPECIAL CLAUSES with no additional payment.

2.1.5 Acceptance of Source

Acceptance of a source of stone is not to be construed as acceptance of all material from that source. The right is reserved to reject materials from certain localized areas, zones, strata, or channels, when such materials are unsuitable for stone as determined by the Contracting Officer. The Contracting Officer also reserves the right to reject individual units of produced specified materials in stockpiles at the quarry, all transfer points, and at the project construction site when such materials are determined to be unsuitable. During the course of the work, the stone may be tested by the Government, if the Contracting Officer determines that testing is necessary. If such tests are determined necessary, the testing will be done in the Government's testing laboratory or commercial

SECTION 35 31 25 Page 6 laboratory selected by the Government. Materials produced from a listed or unlisted source shall meet all the requirements herein. The cost of testing will be at the Government's expense. During the contract period, both prior to and after materials are delivered to the job site, visual inspections and measurements of the stone materials may be performed by the Contracting Officer. If the Contracting Officer, during the inspections, finds that the stone quality, gradation or weights of stone being furnished are not as specified or are questionable, re-sampling and re-testing is required. Sampling of the delivered stone for testing and the manner in which the testing is to be performed shall be as directed by the Contracting Officer. This additional sampling and testing shall be performed at the Contractor's expense when test results indicate that the materials do not meet specified requirements. When test results indicate that materials meet specified requirements, an equitable adjustment in the contract price will be made for the sampling and testing. Any material rejected shall be removed or disposed of as specified and at the Contractor's expense.

2.2 Evaluation testing of stone

2.2.1 Approved Sources

Stone from approved sources shall have the Unit Weight, Bulk Specific Gravity (SSD) and Absorption tested in accordance with ASTM C127 before incorporating stone into the work.

2.2.2 Unlisted Sources

If the Contractor proposes to furnish stone from an unlisted source, the Contractor shall have evaluation tests performed on stone samples collected from the proposed source. The quarry investigation shall be performed by a registered geologist or registered engineer. The tests to which the stone shall be subjected include bulk specific gravity (SSD), absorption ASTM C127, resistance of stone to freezing and thawing ASTM D5312, and if argillaceous limestone and sandstone are used, resistance to wetting and drying COE CRD-C 169 or ASTM D5313. The laboratory to perform the required testing shall be validated based on relevant paragraphs of ASTM D3740, and no work requiring testing shall be permitted until the laboratory has been inspected and validated. The individual tests shall be listed for which the validation covers along with the date of the inspection. The first inspection of the facilities shall be at the expense of the Government and any subsequent inspections required because of failure of the first inspection shall be at the expense of the Contractor.

2.2.2.1 Evaluation Tests

2.2.2.1.1 Bulk Specific Gravity Range

All stone shall have a minimum bulk specific gravity, saturated surface dry (SSD), of 2.50 and a maximum bulk specific gravity of not more than 2.90 based upon water having a unit weight of 62.4 pounds per cubic foot. The method of test for bulk specific gravity (SSD) shall be ASTM C127.

2.2.2.1.2 Absorption

Stone shall have an absorption less than 2 percent unless other tests and service records show that the stone is satisfactory. The method of test for absorption shall be ASTM C127.

SECTION 35 31 25 Page 7

2.2.2.1.3 Resistance to Freezing and Thawing

Stone shall have a maximum loss of 5 percent after the number of cycles specified in ASTM D5312, Figure 1, when determining the durability of stone when subjected to freezing and thawing in accordance with ASTM D5312, except the surface area of one side of the sample shall be between 144 and 2304 square inches.

2.2.2.1.4 Resistance of Rock to Wetting and Drying

Stone shall have a maximum loss of 1 percent when determining the durability of stone when subject to wetting and drying in accordance with ASTM D5313, except the surface area of one side of the sample shall be between 144 and 2304 square inches.

2.2.2.1.5 Samples

Samples of stone from a source not listed at the end of this section shall be taken by a representative of the Quarry under the supervision of the Contracting Officer for testing and acceptance prior to delivery of any stone from this source to the site of the work. Information provided with the samples shall include the location within the quarry from which the sample was taken along with a field examination of the quarry. The field examination shall include the information outlined in ASTM D4992, paragraph

7. Samples shall consist of at least three pieces of stone, roughly cubical in shape and weighing not less than 150 pounds each from each unit that shall be used in the production of the required stone. If the source is an undeveloped quarry, or if the operation has been dormant for more than one year such that fresh samples are not available, expose fresh rock for 20 feet horizontally and for the full height of the face proposed for production, prior to the field evaluation. The samples shall be shipped at the Contractor's expense to a laboratory validated by the Government to perform the required tests.

2.2.2.1.6 Tests

Conduct the tests in accordance with applicable ASTM and Corps of Engineers methods of tests, given in the Handbook for Concrete and Cement, in a laboratory validated by the Government. The cost of testing shall be borne by the Contractor.

2.2.3 Gradation Test

Perform a gradation test or tests on the stone at the quarry. Take the sample in the presence of the Contracting Officer. Notify the Contracting Officer not less than 3 days in advance of each test. Submit the gradation tests using the GRADATION TEST DATA SHEET enclosed at end of this section for riprap or stone. In the event of unavailability of the Contracting Officer, perform the tests and certify to the Contracting Officer that the stone complies with the specifications. At least one gradation test shall be performed per 50,000 tons of stone placed, but not less than one test shall be performed. The gradation tests shall be reported using the forms, GRADATION TEST DATA SHEET attached at end of this section.

The sample shall consist of not less than 50 tons of stone, and shall be collected at the shot, in a random manner which will provide a sample which accurately reflects the actual gradation arriving at the jobsite, and in the presence of the Contracting Officer.

SECTION 35 31 25 Page 8

The sample that passes gradation shall marked and set aside at the quarry for the Contracting Officer to compare with stone delivered to the jobsite. The stone shall not be moved or handled until the project is 80 percent complete.

Failure of the test on the initial sample and on an additional sample will be considered cause for rejection of the quarry and/or quarry process, and all stone represented by the failed tests shall be set aside and not incorporated into the work. Any additional tests required because of the failure of an initial test sample will not be considered as one of the other required tests.

The Contracting Officer may direct additional testing of the stone if the stone appears, by visual inspection, to be out of gradation. The additional tests shall be performed on random loads selected by the Contracting Officer. If the gradation test passes, then an equitable adjustment will be made for the additional test. The Contracting Officer may direct this testing under the Contract Clause INSPECTION OF

CONSTRUCTION.

Certification and test results must be received by the Contracting Officer before the stone is used in the work.

2.2.4 Proportional Dimension Limitations

A maximum of 10 percent flat and elongated pieces by weight will be acceptable. A flat and elongated piece of stone is defined as having a ratio of width to thickness or length to width greater than 3:1. ASTM D4791 shall be used as a guide to perform the test.

2.3 Graded Stone "A"

Graded Stone "A" shall conform to the following table:

GRADED STONE "A"

STONE WEIGHT (Pounds) CUMULATIVE PERCENT FINER BY WEIGHT

5,000 100

2,500 70-100

500 40-65

100 20-45

5 0-15

1 0-5

PART 3 EXECUTION

3.1 QUALITY CONTROL

The Contractor shall establish and maintain quality control for all operations to assure compliance with contract requirements and maintain

SECTION 35 31 25 Page 9 records of quality control for all construction operations, including but not limited to the following:

Location of work Grade and section of structure Stone placement Barge displacement measurements

Contractor shall submit a Quality Control Plan. The quality control plan shall detail actions that will be taken to assure compliance with this section.

3.2 QUALITY ASSURANCE

The Contracting Officer and the Contracting Officer's designated representatives have the right to visit and inspect all project locations concerning all contractual obligations specified herein for the purpose of quality assurance. The Contractor shall furnish a safe and quick means to move Government inspectors to all work locations, including a boat and lifting equipment as necessary. The Contractor shall provide a boat not less than 16 feet in length and a boat operator for daily quality assurance inspections.

3.3 RIVER STAGE LIMITATIONS

The Contractor is expected to work on structures listed in the table below when river stages are between the lower and upper gage limits. Work on the structure shall not occur when river stages are less than the lower gage limit or greater than the upper gage limit unless authorized by the Contracting Officer.

When construction work is delayed due to high or low river stages as determined by the table below, the Contracting Officer will determine the extent of the delay to the work as a whole, and the time fixed for completion of the contract will be extended for the period of such delay.

River Stage Limitations

Structure Gage Lower Gage Limit Upper Gage Limit

Chevron 73.6 L Cape Girardeau -3.5 32

Dike 72.9 L Cape Girardeau -5 32

Chevron 72.5 L Cape Girardeau 1.5 32

Weir 69.15 R Cape Girardeau N/A 18

Weir 68.95 R Cape Girardeau N/A 18

Weir 68.75 R Cape Girardeau N/A 18

Z-Dike 68.1 L Cape Girardeau -4 32

Dike 67.75 L Cape Girardeau 16 32

SECTION 35 31 25 Page 10

Z-Dike 67.7 L Cape Girardeau -1.5 32

Z-Dike 67.5 L Cape Girardeau 0.5 32

Dike Removal 67.3 L Cape Girardeau 6.5 N/A

Dike Removal 67.1 L Cape Girardeau 6.5 N/A

3.4 ORDER OF WORK

The Contractor shall perform work in the order listed in the table below unless directed by the Contracting Officer.

Structure Type of Work Estimated Quantity (tons)

Priority I:

Chevron 73.6 L Constuct a 750 ft long chevron to elevation 339.0 ft NAVD 88. See plan view for additional info.

61,400

Dike 72.9 L Extend Dike 72.9 L 250 ft at elevation 339.0 ft NAVD 88 leaving a 50 ft notch. See plan view for additional info.

27,300

Chevron 72.5 L Constuct a 750 ft long chevron to elevation 339.0 ft. NAVD 88. See plan view for additional info.

61,500

Priority II:

Weir 69.15 R Construct a 320 ft long weir to elevation 304.0 ft NAVD 88. See plan view for additional info.

9,900

Weir 68.95 R Construct a 740 ft long weir to elevation 304.0 ft NAVD 88. See plan view for additional info.

23,300

Weir 68.75 R Construct a 710 ft long weir to elevation 304.0 ft NAVD 88. See plan view for additional info.

16,900

Priority III:

Z-Dike 68.1 L Construct a 710 ft long Z-Dike to elevation 336.0 ft NAVD 88. See plan view for additional info.

76,200

SECTION 35 31 25 Page 11

Dike 67.75 L Construct a 330 ft long Dike to elevation 336.0 ft NAVD 88. Placing recycled revetment stone 100 ft upstream and 200 ft downstream of the Dike head. See plan view for additional info.

3,900

Z-Dike 67.7 L Construct a 710 ft long Z-Dike to elevation 336.0 ft NAVD.

See plan view for additional info.

54,700

Z-Dike 67.5 L Construct a 710 ft long Z-Dike to elevation 336.0 ft NAVD 88. See plan view for additional info.

55,500

Dike Removal 67.3 L Degrade 620 ft of Dike 67.3 L to elevation 314.0 ft NAVD 88. Removed stone should be placed as revetment for adjacent roundout and as revetment for Dike 67.5 L. Any remaining stone may be recycled into other worksites in the contract.

See plan view for additional info.

-19,600

Dike Removal 67.1 L Degrade 300 ft of Dike 67.1 L to elevation 314.0 ft NAVD 88. Removed stone should be placed as revetment for adjacent roundout. Any remaining stone may be recycled into other worksites in the contract.

See plan view for additional info.

-11,200

If river stage limitations per paragraph RIVER STAGE LIMITATIONS prevent working in a high priority area, the Contracting Officer may allow construction on the next lower priority area. However, the Contractor shall not place more stone than the total contract quantity awarded minus the estimated quantity of the higher priority structure(s) that was skipped. If the Contractor places the total contract quantity minus estimated quantity of the higher priority structure(s) that was skipped due to river stage limitations, then work shall stop until river stages are within range to allow work on the priority work areas, unless directed otherwise by the Contracting Officer.

3.5 PLACING STONE

3.5.1 General

The stone shall be placed in such manner as to produce a reasonably well graded mass of stone. The larger stones shall be well distributed throughout the mass and the finished structure shall be not have pockets of small stones and clusters of large stones.

3.5.2 Revetment - Bank Paving

Placement shall begin downstream and work upstream. Placement shall begin at the bottom of the area to be covered and continue up slope.

SECTION 35 31 25 Page 12

The stone shall be placed in such manner as to produce a reasonably well graded mass of stone. The larger stones shall be well distributed throughout the mass and the revetment shall not have pockets of small stones and clusters of large stones. Revetment shall not be dropped from such heights that will cause damage to the stone.

The Contractor shall remove driftwood that prevents access to the worksite but any driftwood along banklines shall be left in place unless the Contracting Officer determines that it would undermine the integrety of the revetment placed. Driftwood that is moved may be placed back in the river, or on the bankline in a location not receiving revetment. Solid waste is not expected to be encountered, however, if solid waste is encountered that would prevent continuous coverage of revetment with existing grade, then the Contractor shall stop work in that location and immediately notify the Contracting Officer.

Care shall be taken to avoid damage to standing timber with a diameter at breast height larger than 12 inches.

3.5.3 Revetment - Caving Bank

Placement shall begin downstream and work upstream. Placement shall begin at the bottom of the area to be covered and continue up slope.

The stone shall be placed in such manner as to produce a reasonably well graded mass of stone. The larger stones shall be well distributed throughout the mass and the revetment shall not have pockets of small stones and clusters of large stones. Revetment shall not be dropped from such heights that will cause damage to the stone.

The Contractor shall remove driftwood that prevents access to the worksite but any driftwood along banklines shall be left in place unless the Contracting Officer determines that it would undermine the integrety of the revetment placed. Driftwood that is moved may be placed back in the river, or on the bankline in a location not receiving revetment. Solid waste is not expected to be encountered, however, if solid waste is encountered that would prevent continuous coverage of revetment with existing grade, then the Contractor shall stop work in that location and immediately notify the Contracting Officer.

Care shall be taken to avoid damage to standing timber with a diameter at breast height larger than 12 inches.

3.5.4 Structure construction

Dikes and Weirs shall be constructed in lifts. The stone shall be placed in approximately uniform layers not exceeding 4 feet in height, proceeding riverward from the bank. Each layer shall be carried the entire length of the structure before beginning the next layer. Low areas and gaps in the lift shall be filled before proceeding with the next lift. For dikes only, the portion of the dike above the water may be placed in one lift.

3.5.5 Structure Repairs

Work will only be required on portions of the dike which are accessible by floating plant between the upper and lower gage limit as shown in paragraph 3.3, unless shown on the plans.

SECTION 35 31 25 Page 13

3.6 Dike Degradation and Recycle Stone

The Contractor shall de-grade the existing structure to the grade and section shown on the plans. The existing structure may contain remnant piles that are to be removed to the grade shown on the plans. The Contractor shall place the stone removed on a barge and measure the displacement per paragraph Barge Displacement before incorporating the stone into work at another location.

3.7 SURVEYS

The Contractor shall collect surveys in accordance with SECTION 35 31 30 for the structures listed below.

Chevron 73.6 L Dike 72.9 L Chevron 72.5 L Weir 69.15 R Weir 68.95 R Weir 68.75 R Z-Dike 68.1 L Dike 67.85 L Z-Dike 67.8 L Z-Dike 67.5 L Dike 61.3 L Dike 67.1 L

3.8 USING RIVER STAGES TO AID IN LAYOUT

The Contractor may choose to use river stages to aid in the layout and construction of structures, however compliance will be checked and surveys, if required, will be in the coordinate system specified in Section 35 31 30

- QUALITY CONTROL SURVEYS FOR RIVER TRAINING STRUCTURES. River gage elevations are in the NGVD 29 vertical coordinate system. The below table may be used to approximate the structure elevation in the NGVD 29 coordinate system.

Structure Design Elevation, NAVD

Approximate Design Elevation in NGVD 29

Chevron 73.6 L 339.0 338.7

Dike 72.9 L 339.0 338.7

Chevron 72.5 L 339.0 338.7

Weir 69.15 R 304.0 303.7

Weir 68.95 R 304.0 303.7

Weir 68.75 R 304.0 303.7

Z-Dike 68.1 L 336.0 335.7

Dike 67.85 L 336.0 335.7

SECTION 35 31 25 Page 14

Structure Design Elevation, NAVD

Approximate Design Elevation in NGVD 29

Z-Dike 67.8 L 336.0 335.7

Z-Dike 67.5 L 336.0 335.7

Dike Removal 67.3 L 314.0 313.7

Dike Removal 67.1 L 314.0 313.7

3.9 CONSTRUCTION TOLERANCES

The finished surface and stone layer thickness shall not deviate from the lines and grades shown by more than the tolerances listed below.

Tolerances are measured perpendicular to the indicated neatlines.

Construction Tolerances

Feature ABOVE (outside) NEATLINE (inches)

BELOW (inside) NEATLINE (inches)

Dike Crown Elevation 24 12

Dike Crown Width 36 12

Dike Slope 1.75H:1V 1.25H:1V

Weir Crown Elevation 12 24

Weir Crown Width 36 12

Weir Upstream Slope 1.75H:1V 1.25H:1V

Weir Downstream Slope 4H:1V 2H:1V

Revetment - Bank Paving 12 12

Revetment - Caving Bank 24 12

-- End of Section --

SECTION 35 31 25 Page 15