35 20 23 dredging.pdf

SECTION 35 20 23 Page 1

Port of Albany Turning Basin, Hudson River, NY Federal Navigation Project 2021

SECTION TABLE OF CONTENTS

DIVISION 35 - WATERWAY AND MARINE CONSTRUCTION

SECTION 35 20 23

DREDGING

08/20

PART 1 GENERAL

1.1 GENERAL INFORMATION

1.2 DEFINITIONS

1.2.1 Maintenance Material

1.2.2 New Work Material

1.2.3 Hard Material

1.3 SUBMITTALS

1.4 METHOD OF COMMUNICATION

1.5 OTHER DREDGING OPERATIONS

1.6 ENVIRONMENTAL COMPLIANCE AND PROTECTION

1.7 BASIS FOR BIDS

PART 2 PRODUCTS

2.1 CHARACTER OF MATERIAL

PART 3 EXECUTION

3.1 INSPECTION

3.2 DREDGING

3.2.1 Order of Work

3.2.2 Interference with Navigation

3.2.3 Lights

3.2.4 Navigation Warnings

3.2.5 Ranges, Gages, and Lines

3.2.6 Dredge Plant and Equipment

3.2.7 Layout of Work

3.2.7.1 Overdepth Dredging

3.2.7.2 Side Slopes

3.2.8 Obstructions and Debris

3.2.9 Dredging Requirements

3.2.10 Quality Control

3.2.11 Surveys during Progress of Work

3.2.12 Skimming of Hoppers

3.2.13 Salvaged Material

3.2.14 Safety of Structures

3.2.15 Protection Plan

3.3 PLACEMENT OPERATONS

3.3.1 Placement of Excavated Materials

3.3.2 Method of Placement

3.3.3 Placement in Indicated Site(s)

3.3.4 Charges for Material Placement

3.3.5 Operation of Sluiceways

3.3.6 Misplaced Dredged Material

3.3.7 Submerged Pipelines

3.4 MEASUREMENT

3.4.1 Method of Measurement

3.4.2 Monthly Estimates

3.5 FINAL EXAMINATION AND ACCEPTANCE

3.6 PLANT REMOVAL

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SECTION 35 20 23 Page 3

PART 1 GENERAL

1.1 GENERAL INFORMATION

This Section covers furnishing suitable dredging plant and performing all work required to remove the specified materials from within the prescribed work area limits as indicated, and placement of the dredge material within the prescribed material placement areas. The Contractor is responsible for making their own investigation of submerged, surface, and overhead structures in the work areas and other locations they find necessary to traverse. The exact location, depths, and heights of various structures including, but not limited to submarine cables, pipes, highlines, docks, piers, bulkheads, and bridges (as applicable), are not known and it will be necessary for the Contractor to ascertain interference problems and notify the respective owners in advance of dredging operations. The

Contractor is responsible for making necessary arrangements with the respective owners of the structure(s) to assure satisfactory completion of dredging in the vicinity with a minimum interruption of service, and shall perform their operations in such a manner as will avoid damage to these facilities.

1.2 DEFINITIONS

1.2.1 Maintenance Material

Maintenance material is defined as that comprising shoaling which has occurred since the channel areas were last dredged.

1.2.2 New Work Material

New work material is defined as previously undredged material.

1.2.3 Hard Material

Hard material is defined as material requiring [blasting or] [the use of] special equipment for economical removal, and includes boulders or fragments too large to be removed in one piece by the dredge.

1.3 SUBMITTALS

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

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Soundings or Sweepings;

1.4 METHOD OF COMMUNICATION

Provide a system of communication between the dredge crew and the crew at the placement area. A portable two-way radio is acceptable.

1.5 OTHER DREDGING OPERATIONS

The Contractor should anticipate the possibility of concurrent dredging operations, adjacent to or nearby the dredge and placement areas in this

SECTION 35 20 23 Page 4 contract. Delays should be anticipated in transiting to, and through, the placement sites during concurrent dredging and placement operations. As a standard safety precaution, observe all placement site specific restrictions pertaining to the limit of dredges operating within at any given time. Coordination with other dredge plant in the vicinity of the dredge and placement areas is required.

1.6 ENVIRONMENTAL COMPLIANCE AND PROTECTION

Comply with conditions and requirements of State or Federal permits. The

Government will secure the permit for dredging and placement of material as indicated. Coordinate with USACE NAN Albany Field Office for placement of excavated materials.

During the life of the contract, provide and maintain environmental protective measures. Also, environmental protective measures required to correct conditions, such as oil spills or debris, that occur during the dredging operations, must be provided. Comply with Federal, State, and local regulations pertaining to water, air, and noise pollution.

1.7 BASIS FOR BIDS

[Base bids on the quantity of dredging indicated. Should the total quantity of dredging vary from that specified as the basis for bidding, the contract price will be adjusted in accordance with FAR 52.243-4 Changes.

The dredging conditions specified and indicated describe conditions which are known. However, the Contractor is responsible for other conditions encountered which are not unusual when compared to the conditions recognized in the dredging business as usual in dredging activities such as those required under this contract.]

[For unit price bid, see [SF 1442, "Solicitation, Offer and Award" and

"Schedule of Bid Items."] [paragraph entitled "Basis of Bids, Measurement, and Payment" in Section 01 20 00 PRICE AND PAYMENT PROCEDURES.]]

PART 2 PRODUCTS

2.1 CHARACTER OF MATERIAL

The material to be removed is silt, sand, and mud. The in situ bulk density of the predominant material to be dredged is as follows:

a. Dredge Area 1 has an in situ consists of 17.5 percent sand, 0.0 percent gravel, and 82.5 percent fines.

b. The Contractor is ultimately responsible for determination of the characteristics of materials to be dredged.

The removal of hard material is not included. Should the Government direct in writing that hard material be removed, the work shall be performed and an adjustment in the contract price or time for completion, or both, will be made in accordance with "FAR 52.236-2, Differing Site Conditions." If hard material is to be removed, blasting will not be permitted.

PART 3 EXECUTION

3.1 INSPECTION

Inspect the work, keep records of work performed, and ensure that gages, targets, ranges, and other markers are in place and usable for the

SECTION 35 20 23 Page 5 intended purpose. Provide, at the request of the Contracting Officer, boats, boatmen, laborers, and materials necessary for inspecting, supervising, and surveying the work. When required, provide transportation for the Contracting Officer and inspectors to and from the placement area and between the dredging plant and adjacent points on shore.

The dredge plant will be inspected by the Contracting Officer, or their representative, prior to beginning work to ensure total dredging plant is in safe working condition. Before any machinery or mechanized equipment is placed in service, it must be inspected and tested by the Contractor and certified to be in safe operating condition.

3.2 DREDGING

3.2.1 Order of Work

The Contracting Officer will direct the Contractor on the order of work.

The Government reserves the right to change the order of work at any time.

3.2.2 Interference with Navigation

Minimize interference with the use of channels and passages. The

Contractor is responsible for shifting or moving of dredges or the interruption of dredging operations to accommodate the movement of vessels and floating equipment, if necessary. Adhere to Coast Guard Regulations for passing vessels.

3.2.3 Lights

Each night, between sunset and sunrise and during periods of restricted visibility, provide lights for floating plants, pipelines, ranges, and markers. Also, provide lights for buoys that could endanger or obstruct navigation. When night work is in progress, maintain lights from sunset to sunrise for the observation of dredging operations. Lighting must conform to United States Coast Guard requirements for visibility and color.

3.2.4 Navigation Warnings

Furnish and maintain navigation warning signs along the pipeline. Provide notice to increase public awareness of potential hazards presented by dredge plant equipment by stating the location, date of construction, equipment mooring, marshaling areas, using local newspapers, radios, television, waterway users associations, or other appropriate area specific communication networks. Ensure that an announcement is made through the same networks at the beginning of the dredging operation.

Make periodic updates/status announcements at intervals of not more than a month throughout the contract life.

Display a sturdy and prominent warning sign at all public boat marinas within 10 miles of dredging operations or moored equipment. The Contractor is responsible for keeping this sign current with respect to the dredging operations or equipment.

3.2.5 Ranges, Gages, and Lines

Provide, set, and maintain ranges, buoys, and markers needed to define the work and to facilitate inspection. Establish and maintain gages in locations observable from each part of the work so that the depth may be determined. Suspend dredging when the gages or ranges cannot be seen or

SECTION 35 20 23 Page 6 followed. The Contracting Officer will furnish, upon request by the

Contractor, survey lines, points, and elevations necessary for the setting of ranges, gages, and buoys.

3.2.6 Dredge Plant and Equipment

a. A mechanical dredge with an environmental bucket will be used to perform all dredging work under this contract.

b. 1 dredge(s) may be in operation under this Contract at a time.

c. Maintain all dredge plant and associated equipment such as, but not limited to, scows, coamings, barges, and pipelines, to meet the requirements of the work. Promptly repair leaks or breaks along pipelines.

3.2.7 Layout of Work

The Contractor will be provided layout charts for all dredging areas based on the schedule of work, the Contractor's hydrosurvey requests, and/or the results of Government hydrographic survey monitoring. The most current

Government hydrosurvey information will be displayed on the dredging layout charts and provided to the Contractor. All depths are measured from COE MLW. Other pertinent information to be included with each layout package will be: payment method, required and maximum dredging depths, coordinates for the material placement site, distance one-way from dredging location to placement site, specific placement site instructions, supplemental tide gauge information, horizontal control locations, and computed hydrosurvey quantities.

The total estimated quantity of material to be removed is computed as that material that is within the specified limits, including side slopes, but excluding unpaid overdepth. The quantities listed are estimates only.

All estimated quantities are subject to FAR 52.211-18 Variation in

Estimated Quantity.

3.2.7.1 Overdepth Dredging

To cover unavoidable inaccuracies of dredging processes, material actually removed to a depth of 1 feet below the minimum required depth specified and within the dredging limits will be measured and paid for at full contract price.

The maximum amount of allowable unpaid overdepth dredging is 1 foot below the specified maximum paid dredging depth.

3.2.7.2 Side Slopes

Side slopes in the dredge areas within this contract will be measured and paid based on a 1 foot horizontal to 3 foot vertical ratio. Dredging on side slopes must follow, as closely as practicable, the dredge area limits indicated on associated layout drawings.

A 1 foot allowance will be made for dredging beyond the indicated or specified side slopes, except as provided herein. Material removed from within the allowance area will be unpaid. The allowance will be determined by projecting a line upwards, paralleling the project design side slopes, from the intersection of the overdepth dredging limit (at a point located vertically below the limit of dredging at the top of slope). The amount of material excavated from side slopes will be determined by either cross-sections or computer, or both.

SECTION 35 20 23 Page 7

3.2.8 Obstructions and Debris

The Government has no knowledge of cables, pipes, or other artificial obstructions or of any wrecks, wreckage, or other material that would necessitate the use of explosives or the employment of additional equipment for economical removal. Contractors should however exercise due diligence in determining the existence of any obstructions within proposed work areas during bid preparation.

3.2.9 Dredging Requirements

Dredge Areas

1) Houghtaling Island Dredg Material Placement Site (DMPS) (USACE)

a) As determined by the results of a hydrographic survey monitoring, the Government will direct the Contractor to dredging areas within the Port of Albany Turning Basin. Dredging depths at this area will be between plus or minus 32 feet and plus or minus 1 foot COE MLW including paid overdepth, unless otherwise stated in the layout drawing.

b) Material placement will be at the USACE owned Houghtaling Island Upland Dredge Material Placement Site. See Section 01 20 00 PRICE AND PAYMENT PROCEDURESfor more details.

3.2.10 Quality Control

Establish and maintain quality control for operations to assure compliance with contractual requirements and maintain records of this quality control for dredging operations.

While performing all dredging work control the horizontal positioning of the dredge with electronic positioning.

3.2.11 Surveys during Progress of Work

Quality of dredging depth will be determined by soundings or sweepings taken behind the dredge as work progresses. The Contractor will take progress soundings or sweepings.

3.2.12 Skimming of Hoppers

Skimming of hoppers must be performed in compliance with environmental requirements and ABS/USCG load line marks.

3.2.13 Salvaged Material

Anchors, chains, firearms, and other articles of value, which are brought to the surface during dredging operations, must remain or become the property of the Government and will be placed on shore at a convenient location near the site of the work, as directed.

3.2.14 Safety of Structures

The prosecution of work must ensure the stability of piers, bulkheads, and other structures lying on or adjacent to the site of the work, insofar as

SECTION 35 20 23 Page 8 structures may be jeopardized by dredging operations. Repair damage resulting from dredging operations is the responsibility of the

Contractor, insofar as such damage may be caused by variation in locations or depth of dredging, or both, from that indicated or permitted under the contract. The Contractor is responsible for coordinating with the owner of the structure for any necessary repairs.

3.2.15 Not Used

3.3 PLACEMENT OPERATONS

3.3.1 Placement of Excavated Materials

Provide for safe transportation and placement of dredged materials.

Transport and placement of dredged material in the Houghtaling Island

DMPS. The Contractor may, at his option, place dredge material in Area B of the site. The placement of dredged materials in unauthorized places is forbidden. Comply with rules and regulations of all, federal, state and local authorities.

3.3.2 Method of Placement

Place all dredged material by the hydraulic offloading. Coordinate completion of load with the Government. Pipeline for hydraulic dredging must discharge into the placement area.

3.3.3 Placement in Indicated Site(s)

In placing excavated material for fill, uniformly grade and allow for shrinkage. Provide and maintain necessary bulkheads, dikes, ditches, weirs, spillways, and other construction necessary to confine and retain the fill in the dredge fill area.

3.3.4 Not Used.

3.3.5 Not Used

3.3.6 Misplaced Dredged Material

Any dredged materials deposited at locations other than in areas designated or approved by the Contracting Officer will be considered misplaced material and will not be paid for until the Contractor, at his own expense, removes and deposits such misplaced material where directed.

This required removal and redeposit of the misplaced material and any necessary placement site restoration work is not the basis for a time extension or additional compensation under this contract.

3.3.7 Submerged Pipelines

If a leak occurs in the discharge pipeline, immediately discontinue using the line until leaks are repaired. Following a leak, the Contractor should conduct, or request the Government to conduct, a hydrosurvey to ensure that any dredged material discharged through the leak did not accumulate or cause mounding. If accumulation did occur, the Contractor must coordinate with the Government to remove the accumulated material, if deemed necessary. The Contractor is responsible for any resulting costs of repair and restoration.

SECTION 35 20 23 Page 9

3.4 Not Used

3.5 FINAL EXAMINATION AND ACCEPTANCE

As soon as practicable after the completion of areas, which in the opinion of the Contracting Officer, will not be affected by further dredging operations, each area will be examined by the Government by sounding or sweeping, or both. Remove shoals and lumps as required by methods approved by the Government. However, if the bottom is soft and the shoal areas form no material obstruction to navigation, removal may be waived at the discretion of the Government. The Contractor will be notified when soundings or sweepings are to be made and will be permitted to accompany the sounding or sweeping party and to inspect the data and methods used in preparing the final quantity for payment. When areas are found to be in a satisfactory condition, the work therein will be accepted as complete.

Re-dredging at the Contract price, within the limit of available funds, may be completed with the consent of both the Government and the

Contractor when infill or shoaling beyond the Contractor's control occurs in any area previously accepted.

3.6 PLANT REMOVAL

Upon completion of the work, remove all dredging plant, including ranges, buoys, piles, and other markers or obstructions within 30 days.

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