Amend_01_Spec.pdf

AM0001

SECTION TABLE OF CONTENTS

DIVISION 01 - GENERAL REQUIREMENTS

SECTION 01 22 00.22 15

MEASUREMENT AND PAYMENT

PART 1 GENERAL

1.1 Mobilization and Demobilization

1.2 Bonds

1.3 STRUCTURE CONSTRUCTION - GRADED STONE A

1.3.1 Measurement

1.3.2 Payment

1.4 REPAIRS - GRADED STONE A

1.4.1 Measurement

1.4.2 Payment

1.5 NOTCH EXISTING STRUCTURE AND RECYCLE STONE

1.5.1 Measurement

1.5.2 Payment

1.6 WEIR AND DIKE DEGRADATION WITH VERIFICATION SURVEY

1.7 REMNANT PILE DIKE 10.1 L REMOVAL

1.8 SHALLOW DRAFT WORKSITE - STRUCTURE CONSTRUCTION - GRADED STONE A

1.8.1 Measurement

1.8.2 Payment

1.9 SHALLOW DRAFT WORKSITE-REVETMENT/BANKLINE REPAIRS AND CONSTRUCTION

- GRADED STONE A

1.9.1 Measurement

1.9.2 Payment

PART 2 PRODUCTS

PART 3 EXECUTION

-- End of Section Table of Contents --

SECTION 01 22 00.22 15 Page 1

SECTION 01 22 00.22 15

MEASUREMENT AND PAYMENT

PART 1 GENERAL

1.1 Mobilization and Demobilization

Payment for mobilization and demobilization will be made at the contract unit price per each for "Mobilization and Demobilization" for each applicable reach of the river, which price and payment shall constitute full compensation for providing all plant, labor, material, and equipment and performing all operations necessary for project mobilization and demobilization as defined in Section 00700, Contract Clause PAYMENT FOR

MOBILIZATION AND DEMOBILIZATION.

1.2 Bonds

Costs for bonds will not be measured for payment. Payment for costs associated with bonding will be made at the contract job price for "Bonds", as defined in the Contract Clauses, Section 00700.

1.3 STRUCTURE CONSTRUCTION - GRADED STONE A

1.3.1 Measurement

The unit of measurement for stone satisfactorily placed in the work will be the ton (2,000 pounds). Final quantities will be computed to the nearest whole ton. If delivered by barge, stone will be measured for payment, by the Quality Assurance Representative, by weight determined by barge displacement. The Contractor shall furnish a list of barges to be used on this contract at the pre-construction conference. This will enable the Government to refer to the "Division Barge Displacement Tables" for updated tables. For any new barges to be utilized on this contract, the Contractor shall furnish with the barge displacement tables a drawing or sketch of each barge, dimensioned in sufficient detail to permit checking of the tables. The drawings shall show, as a minimum, the length, width, and depth of the barge and dimensions of the rake or rakes. Each such table shall have its accuracy certified by a person or firm, other than the Contractor, customarily performing this service. Each table submitted shall contain, in parallel columns, the freeboard of the barge in feet and tenths from zero to the full depth of the barge, and the corresponding gross displacement to the nearest ton. Each barge shall be suitably marked with lines parallel to the barge deck, (4 inches wide and 1 foot long) painted on both sides of the barge at each corner near the rake bulkheads.

The freeboard will be measured at the 4 corners before and after being unloaded and the average of these measurements shall be used to determine the displacement. The amount of displacement will determine the quantity delivered. If the Quality Assurance Representative is unavailable to acquire barge measurements then the Quality Control Representative shall acquire the measurements. Measurements shall be taken at the project site, quarry measurements will not be accepted.

1.3.2 Payment

Payment for stone satisfactorily placed will be made at the contract unit

SECTION 01 22 00.22 15 Page 2 price per ton for "Structure Construction, Graded Stone A" at each applicable reach of the river, which prices and payments shall constitute full compensation for furnishing all material specified in Section 32 22 73.22, and providing all labor, plant and equipment required for accomplishing all work specified in Section 35 31 25.00 15. No separate payment will be made for the removal of drift and debris, excavation for stone dikes and minor bank grading that may be required, and all costs in connection therewith shall be included in the applicable contract price for the item to which the work pertains.

1.4 REPAIRS - GRADED STONE A

1.4.1 Measurement

The unit of measurement for stone satisfactorily placed in the work will be the ton (2,000 pounds). Final quantities will be computed to the nearest whole ton. If delivered by barge, stone will be measured for payment, by the Quality Assurance Representative, by weight determined by barge displacement. The Contractor shall furnish a list of barges to be used on this contract at the pre-construction conference. This will enable the Government to refer to the "Division Barge Displacement Tables" for updated tables. For any new barges to be utilized on this contract, the Contractor shall furnish with the barge displacement tables a drawing or sketch of each barge, dimensioned in sufficient detail to permit checking of the tables. The drawings shall show, as a minimum, the length, width, and depth of the barge and dimensions of the rake or rakes. Each such table shall have its accuracy certified by a person or firm, other than the Contractor, customarily performing this service. Each table submitted shall contain, in parallel columns, the freeboard of the barge in feet and tenths from zero to the full depth of the barge, and the corresponding gross displacement to the nearest ton. Each barge shall be suitably marked with lines parallel to the barge deck, (4 inches wide and 1 foot long) painted on both sides of the barge at each corner near the rake bulkheads.

The freeboard will be measured at the 4 corners before and after being unloaded and the average of these measurements shall be used to determine the displacement. The amount of displacement will determine the quantity delivered. If the Quality Assurance Representative is unavailable to acquire barge measurements then the Quality Control Representative shall acquire the measurements. Measurements shall be taken at the project site, quarry measurements will not be accepted.

1.4.2 Payment

Payment for stone satisfactorily placed will be made at the contract unit price per ton for "Structure Repair, Graded Stone A", "Revetment/Bankline Repairs, Graded Stone A" at each applicable reach of the river, which prices and payments shall constitute full compensation for furnishing all material specified in Section 32 22 73.22, and providing all labor, plant and equipment required for accomplishing all applicable work specified in Section 35 22 23.22 and 35 31 25.00 15. No separate payment will be made for the removal of drift and debris, excavation for stone dikes and minor bank grading that may be required as specified, and all costs in connection therewith shall be included in the applicable contract price for the item to which the work pertains.

SECTION 01 22 00.22 15 Page 3

1.5 NOTCH EXISTING STRUCTURE AND RECYCLE STONE

1.5.1 Measurement

The unit of measurement for notching existing structures and recycling the stone will be the ton (2,000 pounds). Final quantities will be computed to the nearest whole ton. Stone will be measured for payment, by the Quality Assurance Representative, by weight determined by barge displacement. The Contractor shall furnish a list of barges to be used on this contract at the pre-construction conference. This will enable the Government to refer to the "Division Barge Displacement Tables" for updated tables. For any new barges to be utilized on this contract, the Contractor shall furnish with the barge displacement tables a drawing or sketch of each barge, dimensioned in sufficient detail to permit checking of the tables. The drawings shall show, as a minimum, the length, width, and depth of the barge and dimensions of the rake or rakes. Each such table shall have its accuracy certified by a person or firm, other than the Contractor, customarily performing this service. Each table submitted shall contain, in parallel columns, the freeboard of the barge in feet and tenths from zero to the full depth of the barge, and the corresponding gross displacement to the nearest ton. Each barge shall be suitably marked with lines parallel to the barge deck, (4 inches wide and 1 foot long) painted on both sides of the barge at each corner near the rake bulkheads. The freeboard will be measured at the 4 corners before and after being unloaded and the average of these measurements shall be used to determine the displacement. The amount of displacement will determine the quantity delivered. If the Quality Assurance Representative is unavailable to acquire barge measurements then the Quality Control Representative shall acquire the measurements. Measurements shall be taken at the project site, quarry measurements will not be accepted.

1.5.2 Payment

Payment for stone removal will be made at the applicable contract unit price per ton for "Notch Existing Structure and Recycle Stone" at each applicable reach of the river, which prices and payments shall constitute full compensation for all costs associated with shortening the dike and placing the removed stone as specified in Section 35 31 25.00 15. No separate payment will be made for the removal of drift and debris, excavation for stone dikes and minor bank grading that may be required, and all costs in connection therewith shall be included in the applicable contract price for the item to which the work pertains.

1.6 WEIR AND DIKE DEGRADATION WITH VERIFICATION SURVEY

Payment for costs associated with each weir and dike field degradation as specified in Section 35 31 25.00 15 and verification survey as specified in Section 35 31 30.00 15 will be made at the contract Job price for "Weir Degradation with Verification Survey" and "Dike Degradation with Verification Survey" at each applicable reach of the river, which price and payment shall constitute full compensation for providing all plant, labor, material and equipment and performing all operations necessary to degrade all locations above specified removal elevation for each identified weir or dike field.

1.7 REMNANT PILE DIKE 10.1 L REMOVAL

Payment shall constitute full compensation for furnishing all plant, labor, materials, and equipment to perform the remnant pile dike 10.1 L removal, SECTION 01 22 00.22 15 Page 4 which will be made at the contract job price for "Remnant Pile Dike 10.1 L Removal", as specified in Section 35 31 25.00 15 and as shown on the drawings.

1.8 SHALLOW DRAFT WORKSITE - STRUCTURE CONSTRUCTION - GRADED STONE A

1.8.1 Measurement

The unit of measurement for stone satisfactorily placed in the work will be the ton (2,000 pounds). Final quantities will be computed to the nearest whole ton. Stone will be measured for payment, by the Quality Assurance Representative, by weight determined by barge displacement. The Contractor shall furnish a list of barges to be used on this contract at the pre-construction conference. This will enable the Government to refer to the "Division Barge Displacement Tables" for updated tables. For any new barges to be utilized on this contract, the Contractor shall furnish with the barge displacement tables a drawing or sketch of each barge, dimensioned in sufficient detail to permit checking of the tables. The drawings shall show, as a minimum, the length, width, and depth of the barge and dimensions of the rake or rakes. Each such table shall have its accuracy certified by a person or firm, other than the Contractor, customarily performing this service. Each table submitted shall contain, in parallel columns, the freeboard of the barge in feet and tenths from zero to the full depth of the barge, and the corresponding gross displacement to the nearest ton. Each barge shall be suitably marked with lines parallel to the barge deck, (4 inches wide and 1 foot long) painted on both sides of the barge at each corner near the rake bulkheads. The freeboard will be measured at the 4 corners before and after being unloaded and the average of these measurements shall be used to determine the displacement. The amount of displacement will determine the quantity delivered. If the Quality Assurance Representative is unavailable to acquire barge measurements then the Quality Control Representative shall acquire the measurements. Measurements shall be taken at the project site, quarry measurements will not be accepted.

1.8.2 Payment

Payment for stone satisfactorily placed will be made at the applicable contract unit price per ton for "Structure Repair, Graded Stone A, Shallow Draft Work Sites" at each applicable reach of the river, which price and payments shall constitute full compensation for furnishing all material specified in Section 32 22 73.22, and providing all labor, plant and equipment required for accomplishing all work specified in Section 35 22 23.22. No separate payment will be made for the removal of drift and debris, excavation for stone dikes and minor bank grading that may be required, and all costs in connection therewith shall be included in the applicable contract price for the item to which the work pertains.

1.9 SHALLOW DRAFT WORKSITE-REVETMENT/BANKLINE REPAIRS AND CONSTRUCTION -

GRADED STONE A

1.9.1 Measurement

The unit of measurement for stone satisfactorily placed in the work will be the ton (2,000 pounds). Final quantities will be computed to the nearest whole ton. Stone will be measured for payment, by the Quality Assurance Representative, by weight determined by barge displacement. The Contractor shall furnish a list of barges to be used on this contract at the pre-construction conference. This will enable the Government to refer to

SECTION 01 22 00.22 15 Page 5 the "Division Barge Displacement Tables" for updated tables. For any new barges to be utilized on this contract, the Contractor shall furnish with the barge displacement tables a drawing or sketch of each barge, dimensioned in sufficient detail to permit checking of the tables. The drawings shall show, as a minimum, the length, width, and depth of the barge and dimensions of the rake or rakes. Each such table shall have its accuracy certified by a person or firm, other than the Contractor, customarily performing this service. Each table submitted shall contain, in parallel columns, the freeboard of the barge in feet and tenths from zero to the full depth of the barge, and the corresponding gross displacement to the nearest ton. Each barge shall be suitably marked with lines parallel to the barge deck, (4 inches wide and 1 foot long) painted on both sides of the barge at each corner near the rake bulkheads. The freeboard will be measured at the 4 corners before and after being unloaded and the average of these measurements shall be used to determine the displacement. The amount of displacement will determine the quantity delivered. If the Quality Assurance Representative is unavailable to acquire barge measurements then the Quality Control Representative shall acquire the measurements. Measurements shall be taken at the project site, quarry measurements will not be accepted.

1.9.2 Payment

Payment for stone satisfactorily placed will be made at the applicable contract unit price per ton for "Revetment/Bankline Repairs, Graded Stone A, Shallow Draft Work Sites" at each applicable reach of the river, which prices and payments shall constitute full compensation for furnishing all material specified in Section 32 22 73.22, and providing all labor, plant and equipment required for accomplishing all applicable work specified in Section 35 22 23.22. No separate payment will be made for the removal of drift and debris, excavation for stone dikes and minor bank grading that may be required as specified, and all costs in connection therewith shall be included in the applicable contract price for the item to which the work pertains.

PART 2 PRODUCTS

Not Used

PART 3 EXECUTION

Not Used

-- End of Section --

SECTION 01 22 00.22 15 Page 6

SECTION TABLE OF CONTENTS

DIVISION 35 - WATERWAY AND MARINE CONSTRUCTION

35 22 23.22

RIVER TRAINING STRUCTURES CONSTRUCTION DETAILS - MRM 300-195

PART 1 GENERAL

1.1 SCOPE

1.2 QUALITY CONTROL

1.3 RIVER STAGE AND WEATHER LIMITATIONS

1.3.1 No Work Stages

1.3.2 Low River Stages

1.3.2.1 Shallow Draft Work Locations

1.3.2.2 Non-Shallow Draft Work Locations

1.3.3 Revetment Repair

1.4 Types of Work

1.5 SHALLOW DRAFT CAPABILITIES FOR MRM 300-195

PART 2 PRODUCTS

2.1 STONE

PART 3 EXECUTION

3.1 ORDER OF WORK

3.1.1 Work Locations

3.2 CONSTRUCTION PROCEDURE

3.3 REMOVAL OF DRIFT AND DEBRIS

3.4 GRADED STONE A REPAIR

3.4.1 Stone Fill Dikes

3.4.2 Grade and Section

3.4.3 Order of Placement

3.4.4 Placement

3.4.5 Bank Protection Repairs at Dike Heads

3.4.6 Stone Foundation

3.4.7 Stone Revetment

3.5 REVETMENT STONE REPAIR

3.6 CLEARING

3.7 GRADING

3.8 MODIFICATION OF WORK

-- End of Section Table of Contents --

SECTION 35 22 23.22 Page 1

35 22 23.22

RIVER TRAINING STRUCTURES CONSTRUCTION DETAILS - MRM 300-195

PART 1 GENERAL

1.1 SCOPE

The work provided for herein consists of furnishing all plant, labor, material, and equipment and performing all operations in connection with the repair of existing or construction of new stone structures, revetments, notching or removal of existing structures, and appurtenant work in accordance with this section of the specifications and the applicable drawings.

1.2 QUALITY CONTROL

The Contractor shall establish and maintain quality control for all operations to assure compliance with contract requirements and maintain records of quality control for all construction operations, including but not limited to the following:

(a) Location of work.

(b) Removal of debris other then woody material or as needed to access the worksites.

(c) Grade and section of dikes.

(d) Stone placement.

1.3 RIVER STAGE AND WEATHER LIMITATIONS

1.3.1 No Work Stages

No work will be permitted within, 300-195, when the following gage levels are exceeded unless specifically authorized by the Contracting Officer:

(a) Pool 24 - Louisiana, MO gage; Stage of 15 feet or greater

(b) Pool 25 - Mosier Landing, IL gage; Elevation 441 or greater

(c) Pool 26 - Grafton, IL gage; Stage of 18 feet or greater.

(d) River Miles 200.5-195 - Mel Price Tailwater gage; Stage of 21 ft or greater.

When construction work is prevented during such times and because of such actions, 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.

1.3.2 Low River Stages

1.3.2.1 Shallow Draft Work Locations

Low River stage for worksites designated as "Shallow Draft Work Location"

SECTION 35 22 23.22 Page 2 shall be any stage resulting in less than 4 feet of water depth at the worksite or access to the worksite. In the event the Contractor encounters these low stages with no other priority worksite accessible for work, the contract period of performance will be extended day-for-day for each day of low river delay.

1.3.2.2 Non-Shallow Draft Work Locations

In the event low river stages require the Contractor to lighten the barges or to suspend operations entirely, 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.

1.3.3 Revetment Repair

Placement of Graded Stone A will be permitted at all river stages below flood stage, except that subaqueous placement of stone will be as directed by the Contracting Officer.

1.4 Types of Work

Type Description Material

I Repair revetment/bankline from toe of Graded Stone A slope up to top of natural high bank.

II Modify Existing Structure and recycle Graded Stone A stone into structure(s).

III Construct stone foundation along toe of Graded Stone A existing revetment.

IV Restore existing stone structure to elevation Graded Stone A and length specified.

V Restore head of island as specified. Graded Stone A

VI Restore chute closure dike as specified. Graded Stone A

VII Repair roundout at dike head with stone Graded Stone A blanket or toe dike.

VIII Stone removal from structure or revetment Graded Stone A within limits and elevation specified.

IX Scour hole repair with stone fill Graded Stone A

X Raise/Extend existing structure. Graded Stone A

XI Construct Dike as specified. Graded Stone A

XII Construct Chevron as specified. Graded Stone A

XIII Construct Weir as specified. Graded Stone A

XIV Notch existing dikes as specified N/A

XV Construct a bullnose to protect island head Graded Stone A

SECTION 35 22 23.22 Page 3

XVI Construct a W-Dike Graded Stone A

XVII Construction access may require shallow N/A capabilities.

No lumber mattress, piles or stringers will be required under this contract. Woody debris located on site should be incorporated into structure.

1.5 SHALLOW DRAFT CAPABILITIES FOR MRM 300-195

Shallow draft work locations are called out in the contract drawings and also identified in the comments column in the below list of work locations. Special considerations shall be made by the Contractor to ensure their capability to access and perform this work at a River stage resulting in a minimum of 4 feet water depth.

PART 2 PRODUCTS

2.1 STONE

Stone shall conform to requirements of Section 32 22 73.22 - STONE MATERIAL

FOR RIVER TRAINING STRUCTURES.

PART 3 EXECUTION

3.1 ORDER OF WORK

The areas to be repaired are shown on the plans and listed in paragraph Work Locations. Priority work shall be completed first unless directed by the Contracting Officers. After priority work is complete, the Contracting Officer will provide the next priority work sites. The priority work sites may, or may not be included in the contract drawings at time of award. Any priority work added after award within the project limits (Mississippi River Miles 300.0 to 195.0) and scope shall not be considered a contract change. In order that the Contractor may take advantage of higher river stages which occur during the construction season, the Contractor may be permitted to proceed with placing of stone only on the upper part of the revetment and/or dike bankhead. Stockpiling of stone on the revetment will not be permitted. When river stages are such that work can be performed on the lower portion of the revetment or dikes, the Contractor shall return, at its own expense, to the first location at which work is thereafter directed, and complete all work required on the revetment or dikes. In the event that river stages force cessation of work at any locality, and if similar work is required and can be performed at another locality within the contract reach, such work will be made available to the Contractor.

All expenses in moving to the new locality and returning to the original location, when conditions again permit work to be performed, shall be borne by the Contractor.

3.1.1 Work Locations

PRIORITY I:

SECTION 35 22 23.22 Page 4

Location/Mile Type Comments

294.6 L I

V XVII

Restore Dike 294.6 L to elevation 455 from the hinge point towards the navigation channel. This site will require shallow draft capabilities

262.8 L I, X, XI, XVII

Raise and extend 200 ft of Dike 262.8 L tying into Tisdel Towhead. The structure should tie into Tisdel towhead at elevation 438 ft NGVD and slope down to the elevation of the existing structure. Revet approximately 800 ft of the sidechannel side of Tisdel Towhead and revet approximately 150 ft of the head of Tisdel connecting the existing revetment. This site will require shallow draft capabilities. See drawings for approximate location coordinates and profiles.

258.6 R I, XVII Revet 500 ft roundout downstream of Dike

258.6 R. This site will require shallow

draft capabilities. See drawings for approximate location coordinates

222.3 R I Restore 500 ft of revetment on Island

#521. See Drawings for approximate location coordinates.

PRIORITY II:

Location/Mile Type Comments

281.0 R I, XVII Revet approximately 500 ft upstream of

the unnamed creek. This site will require shallow draft capabilities See drawings for approximate location coordinates.

267.0 R IV, XVII Restore approximately 1,700 ft of the

Slim Island Bullnose to 440 NGVD leaving two 50 ft notches where indicated. This site will require shallow draft capabilities.

247.8 L IV Restore approximately 675 ft of off

bankline revetment. See drawings for approximate location coordinates.

241.3 L I, XVII Revet approximately 75 ft of the left

descending bank. This site will require shallow draft capabilities. See drawings for approximate location coordinates.

SECTION 35 22 23.22 Page 5

Location/Mile Type Comments

239.5 R I, XVII Revet approximately 100 ft of the right

descending bankline. This site will require shallow draft capabilities. See drawings for approximate location coordinates. Please contact the homeowner 48 hours in advance so that he can move his dock. Doug Walkenhorst 314-650-8283.

235.0 R IV, XVII Restore Dike 235.0 R to elevation 425

leaving a 250 ft notch. This site may require shallow draft capabilities. See drawings for approximate location coordinates.

222.5 L IV, XVII Restore 250 ft existing spur dike to

original design elevation of 422 ft NGVD and tie into bankline. This site may require shallow draft capabilities. See drawings for approximate location coordinates.

197.7 R IV Restore and cap the end of sand filled

Dike 197.7 R to elevation 405 ft NGVD.

See drawings for approximate location coordinates.

3.2 CONSTRUCTION PROCEDURE

Before work is to begin at any locality, the Contractor shall inspect that locality with an authorized representative of the Contracting Officer. The Contractor shall ascertain the types and approximate quantities of materials and equipment necessary to perform the repairs indicated at that locality and shall have sufficient supplies and equipment available for use at the said locality in time to permit the work to begin and progress without delay.

3.3 REMOVAL OF DRIFT AND DEBRIS

The Contractor shall remove any drift, standing timber, and debris which has accumulated on the dikes or banks to the extent necessary to provide clear working space for making the required repairs.

3.4 GRADED STONE A REPAIR

3.4.1 Stone Fill Dikes

The location and length of each dike and toe dike or section thereof to be constructed or repaired shall be in accordance with the drawings for paragraph Work Locations. The repairs shall be constructed with Graded Stone A, conforming to the requirements of Section 32 22 73.22, placed as specified. Timber pile dikes, or designated portions thereof, shall be converted to stone fill dikes by placing Graded Stone A therein. Existing stone fill dikes, or designated portions thereof, and toe dikes shall be built up to the required grade and section with new Graded Stone A.

SECTION 35 22 23.22 Page 6

3.4.2 Grade and Section

The elevation or grade at the crest of each structure shall be constructed as shown on the plans or in paragraph Work Locations. The crown width for each dike shall be 6 feet unless otherwise directed by the Contracting Officer's Representative and the side slopes shall be determined by the angle of repose, approximately 1V on 1.5H.

3.4.3 Order of Placement

Placement of stone in a dike shall be started at the end nearest the bank and proceed continuously toward the riverward end. A tolerance of 1 foot will be allowed in the specified elevation, and 1 foot under and 2 feet over in the specified crown width. When, in the opinion of the Contracting Officer, river stages are such as to restrict operations at the landward end, the Contracting Officer reserves the right to direct the Contractor by written notice to either lighten the barges or resort to other equipment, in which event an equitable adjustment will be made in accordance with Contract Clause entitled "Changes". For the underwater portion of the dike the stone shall be placed in approximately uniform layers not exceeding 4 feet in thickness, proceeding riverward from the bank. Each layer shall be carried the entire length of the dike and low areas and gaps shall be brought up to the desired elevation before proceeding with the next lift.

That portion of the dike above the water may be placed in one lift. When scouring of the river bed occurs, the Contractor shall blanket the center 10 foot width of the dike base for the entire length of the dike with stone to a depth of 4 feet before placing the remainder of the stone for the dike. The Contractor is advised that should the total estimated quantity of stone, as shown on the Bidding Schedule, be placed prior to completing the repairs at all locations specified in paragraph Work Locations, the work under this contract may, at the discretion of the Contracting Officer, be considered complete, regardless of the total number of locations repaired.

3.4.4 Placement

The stone shall be placed in the dikes and chevrons in such manner as to produce a reasonably well graded mass of stone. The material may be placed by crane or dragline equipped with skip, grapple, rock bucket or clamshell or other approved equipment. The material above the water surface shall be rearranged or shaped to the prescribed section after placement. Additional material shall be added below the water surface as directed if soundings or sections indicate such to be necessary. The larger stones shall be well distributed throughout the mass and the finished dike shall be free from pockets of small stones and clusters of large stones.

3.4.5 Bank Protection Repairs at Dike Heads

Bank protection repairs may include adding Graded Stone A to the existing dike heads as necessary to restore the original grade and section adjacent to stone fill dikes. The location and extent of each type of work shall be as directed by the Contracting Officer pursuant to paragraphs Work Locations and CONSTRUCTION PROCEDURE. The repairs shall be constructed with Graded Stone A conforming to the requirements of Section 32 22 73.22 and placed as specified in paragraph Placement.

SECTION 35 22 23.22 Page 7

3.4.6 Stone Foundation

A stone foundation shall be constructed when required to stabilize the bank adjacent to a dike or within a reach of bank protection repairs. The stone foundation shall be constructed of Graded Stone A conforming to the requirements of Section 32 22 73.22 and placed as specified in paragraph Placement.

3.4.7 Stone Revetment

Stone revetment shall consist of a course of Graded Stone A with a minimum thickness of 30 inches. The limits of the area to be paved at dike heads, on slopes behind roundouts, and on specified areas of bankline shall be as directed by the Contracting Officer. Where necessary to make connection with subaqueous work, the bank protection may be extended by placement of stone under water. The limits of underwater paving and the amounts required shall be as directed by the Contracting Officer.

3.5 REVETMENT STONE REPAIR

Bank protection repairs may include adding Graded Stone A to the existing revetment to restore the original grade and section and placing stone a minimum of 30 inches thick on areas eroded by wavewash or ice. The location and extent of each type of work shall be as directed by the Contracting Officer pursuant to paragraph Work Locations. The repairs shall be constructed with stone conforming to the requirements of Section 32 22 73.22 and placed as specified in paragraph Placement.

3.6 CLEARING

No bank clearing is anticipated.

3.7 GRADING

No bank clearing is anticipated.

3.8 MODIFICATION OF WORK

The work locations shown on the plans and listed in the specifications and the quantities shown on the Bidding Schedule are estimated requirements based on existing available surveys, including soundings, and anticipated conditions in the field at the time of construction. Additional surveys by the Government, and/or actual field conditions which develop as the work proceeds, may make it desirable to increase or decrease the amount of work, shift the work location, modify lengths and heights, add to or eliminate the bank protection, and/or stone foundations required at the dikes, and/or increase or decrease the quantities of stone required, in which case the Government reserves the right to make any or all of the aforesaid changes, within the scope of this section which changes may extend the work to embrace locations anywhere on the Mississippi River between Mississippi River Miles 300.0 to 195.0, without change in the contract unit prices.

-- End of Section --

SECTION 35 22 23.22 Page 8