W912BU25BA008_Amendment 0003_Specs.pdf

Amendment 0003

IFB W912BU25BA008

SECTION 35 20 23

DREDGING

PART 1 GENERAL

1.1 WORK COVERED BY CONTRACT PRICE

The contract price per cubic yard for dredging shall include the cost of removal and disposal of all materials as specified herein or indicated on the drawings, with the exception of ledge rock, large boulders, rock fragments, wrecks, snags, stumps, and piles which cannot be removed or buried below project depth without blasting. Should ledge rock or other material which cannot be removed without blasting be encountered, the Contractor shall remove therefrom all overlying material which in the judgment of the Contracting Officer can be removed. Nothing in this paragraph shall be construed as prohibiting the removal of excepted material by special means at prices agreed upon and approved in accordance with FAR 52.236-2 entitled: "DIFFERING SITE CONDITIONS".

1.2 REFERENCES

The publications listed below form a part of these specifications to the extent referenced. The publications are referred to in the text by their basic designation only.

AMERICAN WOOD PROTECTION ASSOCIATION (AWPA)

AWPA U1 (2024) Use Category System: User Specification for Treated Wood

AWPA M4 (2023) Standard for the Care of Preservative-Treated Wood Products

AWPA P5 (2015) Standard for Waterborne Preservatives

ASTM INTERNATIONAL (ASTM)

ASTM D1556/D1556M (2015; E 2016) Standard Test Method for Density and Unit Weight of Soil in Place by Sand-Cone Method

ASTM E100 (2019; R 2024) Standard Specification for ASTM Hydrometers

NEW JERSEY DEPARTMENT OF TRANSPORTATION (NJDOT)

NJDOT Specifications (2019) Standard Specifications for Road and Bridge Construction

SOUTHERN PINE INSPECTION BUREAU (SPIB)

SPIB 1003 (2021) Standard Grading Rules for Southern Pine Lumber

Section 35 20 23 Page 1

U.S. ARMY CORPS OF ENGINEERS (USACE)

EM 385-1-1 (2024) Safety -- Safety and Occupational Health (SOH) Requirements

EM 1110-2-1003 (2013) Hydrographic Surveying Manual

AMERICAN LUMBER STANDARDS COMMITTEE (ALSC)

ALSC PS 20 (2021) American Softwood Lumber Standard

U.S. NATIONAL ARCHIVES AND RECORDS ADMINISTRATION (NARA)

33 CFR 156 (2013) Oil and Hazardous Material Transfer Operations

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-01 Preconstruction Submittals

Disposal Area Plan; G,COR Fall Protection Inspection Report; G,COR Discharge Pipe Support; G,COR Vessel and Equipment List; G,COR Outfall Pipe Extension Work Plan; G,COR

SD-02 Shop Drawings

Sluice Walkway Plan; G,DO

SD-05 Design Data

Design Data; G,DO Sluice Walkway; G,DO

SD-06 Test Reports

Daily Report of Operations; G,COR Daily Log of Surveys Performed; G,COR Daily Dredgehead Positioning Records; G,COR Fuel Usage Disposal Area Effluent Measurements; G,COR Fall Protection Inspection Report; G,COR

SD-07 Certificates

Timber for Flashboards and Sluice Box Walkways; G,COR Aggregate Material; G,COR

1.4 ORDER OF WORK AND DREDGING TIME RESTRICTIONS

Unless otherwise directed by the Contracting Officer, the dredging work shall commence Acceptance Section #1 and work upstream completing all work

Section 35 20 23 Page 2 in the Delaware River. Dredging in the Fariless Turning Basin (AS-8) shall be conducted last. Unless otherwise directed by the Contracting Officer, the Contractor is required to commence dredging work in Acceptance Section 1 and work upstream to Acceptance Section 8. Dredging under this contract shall be subject to the requirements specified in Section 01 57 19 TEMPORARY ENVIRONMENTAL CONTROLS and the following seasonal time restrictions:

a. Dredging in Delaware River between Burlington and Newbold Islands must be conducted between 1 July and 31 December.

b. Dredging within Fairless Turning Basin must be conducted between 1 July and 15 March.

1.5 SCHEDULING OF WORK ASSIGNMENTS

1.5.1 General

Complete each work assignment within the number of calendar days, computed in accordance with the method specified below, after the date of receipt of each successive notice to proceed provided that no work assignment will result in work being performed after the contract completion date stated in Contract Clauses. For the purpose of these specifications, work assignment is defined as the reach of a specific range(s) which is to be dredged to the dimensions specified herein or shown on the drawings to the depth required by the Contracting Officer. Work may be assigned in any, but not necessarily all, of the areas identified in the paragraph herein titled: "ESTIMATED QUANTITIES", or may be assigned in additional areas as specified in Paragraph "PHYSICAL DATA" of Section 01 30 00 ADMINISTRATIVE

REQUIREMENTS.

1.5.2 Plant and Equipment

Keep sufficient dredge plant and equipment capable of performing at the specified production rates for any required dredging on the job site, and employ this equipment by continuously dredging from the start of the first work assignment until the completion of the last work assignment except for allowable down time for movement of pipe, etc. Site work required at the Government-furnished disposal areas shall be completed in sufficient time so as not to delay any of the work assignments. Movement of equipment between successively used disposal areas will not be subject to assessment of liquidated damages except as specified under paragraph titled: "MEASUREMENT AND PAYMENT".

1.5.3 Government-Furnished Information

The Government will provide to the Contractor, the second and subsequent work assignments not later than ten calendar days before the completion date of the current work assignment. If all data contained in the attached sample work assignment letter is not available at that time, an initial notice of work assignment will be issued. This notice will contain at a minimum, the work assignment commencement date, range, approximate stationing, order of work, 24-hour production rate and disposal area to be used. In such instances the before-dredging soundings, required depth, and acceptance sections will be furnished prior to the scheduled commencement date, with the remaining information to be furnished as soon as possible thereafter. The completion times and dates provided for work assignments will be estimated since subsequent before-dredging surveys will be obtained for each acceptance section as

Section 35 20 23 Page 3 specified in paragraph titled: "MEASUREMENT AND PAYMENT". The scheduled work assignment completion date will be determined by the sum total of pay quantity available within all acceptance sections. If the Contractor projects completion of a work assignment prior to the completion date established by the Government, he shall advise the Contracting Officer as soon as possible so as to expedite issuance of the next work assignment.

The actual completion date of each work assignment will be used to determine the commencement date for the next work assignment in order to maintain continuous dredging throughout the contract.

1.6 CHARACTER OF MATERIALS

a. The material to be removed to restore the depth to within the limits called for in the specifications and drawings, is that composing the shoaling which has occurred since the channel was last dredged as noted in Section 01 30 00 ADMINISTRATIVE REQUIREMENTS. The character of the material is believed to be as indicated by the results of Government-conducted sampling. Abstract of bottom samples can be found in Appendix B40 ABSTRACT OF BOTTOM SAMPLES. Material typically dredged and sampled in the past consisted of very soft silt with some clay and fine sand.

b. It is the Government's position that sufficient information has been provided in this contract package to enable the Contractor to establish the type and quantity of material to be removed. USACE Survey and Mapping hydrographic survey information is available online through the eHydro link at http://navigation.usace.army.mil/Survey/Hydro . Data on this or other websites are not appropriate for volume computations. Full datasets are available upon request. However, prior to bidding, the Contractor may, at his discretion and expense, conduct additional investigation to further determine conditions at the site.

1.7 SITE CONDITIONS

Bidders are expected to examine the site of the work, including the disposal area and decide for themselves as to the conditions affecting their operations. See the Contract Clause titled: "SITE CONDITIONS AND CONDITIONS AFFECTING THE WORK". The entire work site is designated as a hard hat area in accordance with EM 385-1-1 .

1.8 DAILY LOG OF SURVEYS PERFORMED

When the Contractor conducts his own surveys of the contract work, a daily log of surveys performed shall be submitted. A sample daily log is included at the end of this section. The log shall include the area surveyed, the tide gauge used, and the calibrations performed (e.g.

barchecks, SV probes).

1.9 DAILY DREDGEHEAD POSITIONING RECORDS

For all dredging and for each dredge employed under this Contract, a computerized positioning system capable of representing the horizontal and vertical position of the hydraulic cutterhead, and/or clamshell bucket at any given time throughout the dredging cycle shall be utilized.

Horizontal and vertical positioning of the draghead and/or cutterhead and/or bucket shall be recorded at intervals not greater than one minute in duration. The horizontal and vertical (x,y,z) positions of the dredge draghead, cutterhead, and/or bucket shall be provided to the COR in an approved electronic format. Commercially available systems such as those

Section 35 20 23 Page 4 offered by companies under the registered trademarks of Dredgepak, Winops, or similar proprietary systems developed by the Contractor would be considered satisfactory. The system shall produce a record of the working locations, horizontal and vertical, of the draghead and/or cutterhead and/or bucket, in a continual display and in a submittal satisfactory to the COR. Submittals of this information shall be transmitted electronically to the COR daily at the same time as the Daily Operations Report.

1.10 VESSEL AND EQUIPMENT LIST

Submit a complete list of all vessels and equipment to be used during the contract, including all dredging plants, supporting vessels, and equipment. Include on the list, the types, the numbers of each, the draft of each, and all other pertinent information. List the survey vessel, survey crew, type of survey equipment, and software that may be used.

1.11 HYDROGRAPHIC SURVEYS

Conduct hydrographic surveys to meet USACE Performance Standards for Navigation and Dredging Support, as defined in the Hydrographic Surveying Manual EM 1110-2-1003 . Hydrographic surveys may be performed with singlebeam, multibeam or both. Bottom soundings shall be obtained by the single beam fathometer operating at a frequency ranging from 190 to 210 kHz. When utilizing multi-beam technology, the operating frequency will range from 180 to 250 Khz. All fathometers shall be calibrated following procedures outlined in the referenced EM.

1.12 FUEL OIL HANDLING

Ensure that all fuel oil transfer operations to or from the plant comply with all Federal, state, and municipal laws, codes and regulations.

Incorporate in the Accident Prevention Program, submitted in compliance with the Contract Clause: "ACCIDENT PREVENTION", sufficient information to demonstrate compliance with 33 CFR 156 and any other applicable laws, codes, and regulations.

Submit on or before the last day of each month, a Fuel Usage report listing the totals of fuels consumed by the dredging plant and supporting vessels. Separately list the quantities of each type of fuel used. Each report shall cover the period from the 25th of the preceding month to the 25th of the current month.

1.13 GOVERNMENT PLANT

Government plant may perform dredging or use disposal sites in any Delaware River assignment area during the time of this contract.

PART 2 PRODUCTS

2.1 TIMBER FOR FLASHBOARDS AND SLUICE BOX WALKWAYS

Timber for flashboards and sluice box walkways shall be Southern Yellow Pine, Grade No. 1, and shall conform to the SPIB 1003 and the applicable requirements of U. S. Department of Commerce ALSC PS 20 . The timber shall be surfaced on four sides and the dress size shall conform to U. S.

Department of Commerce ALSC PS 20 . The timber shall be treated in accordance with Use Category UC5B of AWPA U1 with waterborne preservatives listed in AWPA P5. Flashboards shall be 4 inch nominal thickness. Submit

Section 35 20 23 Page 5 certificates of compliance attesting that the timber flashboards and sluice box walkway timber conform to the requirements of this specification.

2.1.1 Brush-Applied Preservative Treatment

AWPA M4.

2.2 AGGREGATE MATERIAL

Submit certificates from the aggregate material suppliers, attesting that the materials conform to the project requirements; based on independent laboratory tests performed within the last 5 years. If test results are not available, the required testing shall be performed before the material can be approved for use on this project. Submit certification that recycled material being used as graded aggregate, is neither hazardous nor toxic.

2.2.1 Dense Graded Aggregate Ramp

Dense graded aggregate conforming to Section 901.10 of the NJDOT Specifications , or an approved equal.

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 intended purpose. Furnish, 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 disposal area and between the dredging plant and adjacent points on shore.

3.2 CONDUCT OF DREDGING WORK

The Contractor must turn off the dredge cutterhead while moving anchors, until the anchors are relocated and the derrick is out of the cutterhead swing radius of the dredge.

3.2.1 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 shall conform to United States Coast Guard requirements for visibility and color.

3.2.2 Ranges, Gages, and Lines

Furnish, 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 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.

Section 35 20 23 Page 6

3.2.3 Plant

Maintain the plant, scows, coamings, barges, pipelines, and associated equipment to meet the requirements of the work. Promptly repair leaks or breaks along pipelines. Remove dredged material placed due to leaks and breaks.

3.2.4 Dredging Disposal

The material excavated shall be transported, deposited, confined and graded to drain as specified within the disposal areas shown on the drawings. The following upland disposal areas will be available:

a. Money Island

3.2.5 Misplaced Material

Any material deposited in places other than those designated or approved by the Contracting Officer, or which escapes from such places, will not be paid for. The Contractor may be required to remove such misplaced material in accordance with the Contract Clause entitled: "OBSTRUCTION OF NAVIGABLE WATERWAYS", and deposit it where directed, at no additional cost to the Government.

3.2.6 Hopper Dreding

Hopper dredging will not be permitted under this contract.

3.2.7 Deleted

3.2.8 Deleted

3.2.9 Government Quality Control Monitor

The Government may place a Government monitor aboard the Contractor's dredge or supporting vessels to monitor quality control conditions during dredging and disposal operations. See Section 01 30 00 ADMINISTRATIVE REQUIREMENTS, paragraph titled "ACCOMMODATIONS AND MEALS FOR GOVERNMENT

INSPECTORS".

3.2.10 Submerged Pipeline

If a leak occurs in the discharge pipeline, immediately discontinue using the line until leaks are repaired. Remove material placed due to leaks or breaks.

3.2.11 Floating Pipeline

Should the Contractor's pipeline not rest on the bottom, it will be considered a floating pipeline and shall be visible on the surface and clearly marked. In no case will the Contractor's pipeline be allowed to fluctuate between the surface and the bottom, or lie partly submerged.

Lights shall be installed on the floating pipeline as required in Section

01 30 00 "ADMINISTRATIVE REQUIREMENTS".

Section 35 20 23 Page 7

3.2.12 Navigation Warnings

Furnish and maintain navigation warning signs along the pipeline.

3.2.13 Method of Communication

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

3.2.14 Salvaged Material

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

3.2.15 Plant Removal

Upon completion of the work, promptly remove plant, including ranges, buoys, piles, and other markers or obstructions.

3.3 DEVELOPMENT AND OPERATION OF DISPOSAL AREA

3.3.1 Contractor Coordination

a. No disposal area work shall begin prior to a disposal area preparatory meeting and site visit. Coordinate with Project Engineer at least 14 days prior to mobilization to disposal area.

b. At least 7 days prior to the use or modification of any Government-owned land or facilities, the Contractor shall contact Mr. Dan Kelly, Project Manager, at 215-200-2340.

3.3.2 General

a. Submit at or before the pre-dredging coordination meeting, a Disposal Area Plan prior to the use or modification of any Government-furnished disposal area. Show in the plan the areas or portions thereof to be used, the locations and cross-sections of proposed dikes, the locations of sluices and drainage structures, the manner in which the dredged material will be distributed in the disposal area, and the manner in which the initial weir elevation/sluice height at the sluice is to be established at the beginning of the disposal operation. Include in the plan necessary site specific sluice modifications. Conduct all work in accordance with the approved plan; however, approval of the plan by the Contracting Officer does not in any manner relieve the Contractor of his responsibility for the adequacy of the design and construction of the required structures and drainage facilities. The Contractor is responsible for the maintenance and repair of all Government-owned land, roads, and facilities used by him under the contract. Remove all Contractor-owned dredging pipe(shore or submerged) used in the contract work, from the site within 30 days of completion of all dredging work.

b. Take all necessary measures to ensure that the condition of the disposal area, namely the dike, does not deteriorate or become damaged due to the pumping of dredged material into the site. Take every precaution to meet each of the requirements outlined in this specification in order to maintain the integrity of the disposal area. Stop pumping into the disposal area and contact the Contracting Officer immediately if seepage

Section 35 20 23 Page 8 occurs on the exterior toe of the dike.

3.3.3 Disposal Area

a. Existing Government-furnished retaining dikes, sluices and drainage structures are available for use. Clear the area within and around the sluices of all vegetation and debris, and make all repairs, strengthening, extensions and modifications to such facilities as are necessary for confining the excavated material and for controlling disposal area effluent, until acceptance of all work under the contract. The Contractor will be permitted, in the Government-furnished disposal area, to construct any structures or use any means necessary to control the dredge effluent as required to meet these specifications, with prior approval from the Contracting Officer. All work performed in the disposal area by the Contractor shall be consistent with the approved disposal area plan.

b. Maintain, repair and stabilize all dikes, land, roads and structures used under the contract, and inspect the dikes on a daily basis to assure their safety and stability. Restore all dikes, roads, structures and areas disturbed through contract operations to a satisfactory condition as approved by the Contracting Officer, at no additional cost to the Government. The Government will have the right to regulate the use of the disposal area throughout the contract.

c. Contractor-furnished pipelines shall enter the disposal area only within the the limits shown on the drawings. The Contracting Officer reserves the right to direct the extension of the Contractor-furnished pipelines beyond the discharge limits shown on the drawings, or to a specific location within the disposal area, if required for efficient management of the disposal area. Make provisions to prevent erosion of the dike embankment at the discharge point. The end of all discharge pipes shall be located inside the disposal area limits at a distance not less than the distance indicated on the drawings. Unless otherwise noted on the drawings, the end of the discharge pipe shall be located inside the disposal area limits not less than 40 feet from the interior toe of the dike, measured normal to the dike centerline. This length of pipe inside the disposal area shall be sufficiently and safely supported along the entire length by timber cribbing, a compacted earthen embankment or other means approved by the Contracting Officer. In addition, the pipe shall be angled in the horizontal plane such that the discharge does not scour the slope face or the toe-of-slope in the vicinity of the discharge area.

Submit a description of the proposed method for discharge pipe support, to support the discharge pipe inside the disposal area as required by these specifications, to include sketches showing plan and elevation views and details for the proposed method, and data on the materials to be used.

The Government reserves the right to make the Government-furnished disposal area available for use by others when not in use as part of any work assignment under this contract. Obtain written permission from the Contracting Officer prior to entering on or utilizing any property owned or leased by the Government other than the diked disposal area.

d. Construct a crushed aggregate ramp as shown on the drawings to protect the discharge pipe where it crosses the existing access road. Construct the access ramp to the width of the access road, and compact the aggregate around the discharge pipe.

3.3.4 Additional Disposal Area Requirements

a. Borrow for diking material may be obtained from within the disposal

Section 35 20 23 Page 9 area but not closer than 50 feet from the inside toe of the dike sections. Wet or dry borrow material as required to obtain optimum practical moisture content, in accordance with ASTM D1556/D1556M . Borrow material and the ground surface upon which it is to be placed, shall be free of all debris, timber and accumulations of vegetation. Place dike material in approximately equal layers not exceeding 12 inches in loose thickness and compact by the controlled traffic of spreading and/or hauling equipment over each layer. Borrowing of material from the area outside the existing perimeter dikes will not be permitted. Provide impervious material required for mitigation of seepage problems during disposal operations from an approved off-site source if suitable material is unavailable from within the disposal area.

b. Maintain a freeboard of two feet or more, measured vertically between the retained materials and water and the top of the adjacent confining dikes. If the required freeboard is not met, stop pumping into the disposal area until corrective means that are satisfactory to the Contracting Officer have been taken.

c. Pipe type sluices are not permitted through exterior dikes, and the dredge pipe shall not enter the disposal area through an exterior dike.

The hydraulic placing of perimeter dikes is not permitted.

d. Perform modifications to the disposal area that prevents obstruction of drainage on upland areas adjacent thereto, and to leave free, clear and unobstructed outfalls of sewers, drainage ditches, and other structures affected by the disposal operations. Distribute dredged material within the used portion of the disposal area in a reasonably uniform manner that allows the disposal surface area to drain after fill operations have ceased without creating excessive ponding on the fill surface.

e. Submit a detailed plan of the proposed Sluice Walkway. In accordance with the approved Sluice Walkway Plan, construct structurally sound access walkways with handrails on both sides of the walkway from the dikes to the sluices throughout their length, and a walkway in a "T" formation along the front of the sluices to enable the inspector to readily obtain the samples of the mixture going over the discharge box interior weir as hereinafter specified. Timber used to construct the walkways and handrails shall be in accordance with the requirements specified in the Paragraph titled, "TIMBER FOR FLASHBOARDS AND SLUICE BOX WALKWAYS" for the sluice box timber and in accordance with Section 21 of EM 385-1-1 . For bidding purposes, assume new timber for sluice box walkways is required.

f. Prior to pumping material into the disposal area, inspect the existing fall protection by a qualified person as defined in EM 385-1-1 . Remove existing systems not meeting this approval, and install a new system in accordance with EM 385-1-1 . Submit the Fall Protection Inspection Report of the existing system and design data for new systems. For bidding purposes, assume new fall protection systems are required.

g. Provide full body safety harnesses for employees and Government inspectors during the installation and removal of flashboards and the taking of samples from the effluent sampling location in the discharge box. Each person working on the sluice shall wear a safety harness as described in the approved site specific fall protection plan. A competent person in fall protection is required at the sluice box when fall protection is being used to add or remove boards.

h. Provide a minimum of 2 personnel at the disposal area when work

Section 35 20 23 Page 10

(disposal or other) is being performed at a disposal area. Provide a generator with a light plant sufficient to light the sluice area during darkness. Provide disposal area personnel two-way radio communication with the dredge at all times.

i. Perform routine inspections of the dikes prior to the start of dredging operations and at least twice a day during dredging operations.

Conduct inspections along the entire perimeter of the disposal area, concentrating on the condition of the dike to ensure its integrity. If any signs of distress are noted during any inspection, pumping of dredged material must stop immediately and the Contractor shall notify the appropriate Army Corps personnel. Typical signs of distress may include excessive seepage, fissures and slope failures.

j. Government Pipelines and Sluices: Government-owned pipelines will not be available for use by the Contractor. If the Contractor uses the existing sluices for this work, he shall be responsible for their maintenance. Prior to dredging operations, perform the following:

(1) Inspect sluice boxes for damage and/or deteriorated sluice flashboards and steel framework in the presence of the Contracting Officer. Remove existing flashboards and provide new flashboards prior to deposition of dredged material into the structure, and repair deteriorated or damaged steel framework as directed by the Contracting Officer.

(2) Remove dirt, mud, and debris from inside the sluice box.

(3) Weight the entire bottom of the inlet box with 12 inches of AASHTO No. 1 coarse aggregate (nominal size 2.5 inches), as shown on the figure included at the end of this section.

(4) During dredging operations, if a flashboard(s) deteriorates and there is no viable disposal option, grafting of plywood to weakened sluice walls may be utilized as a temporary fix as directed by the Contracting Officer. Polyethylene sheeting may also be attached to the outside flashboards to control seepage through the boards as directed by the Contracting Officer. However, as soon as practicable, remove and replace deteriorated flashboards with new wood. These sluices shall be functional and returned to the Government at the completion of the work assignment and shall be free of all damage except for normal wear and tear.

(5) Conduct a preparatory meeting with the COR for the inspection of the disposal area, sluice and fall protection systems.

k. Inspect the disposal area and sluice after work is complete and after the water has drained from the area for signs of dike distress. Report apparent seepage, stability, or safety problems immediately to the Contracting Officer and the appropriate Army Corps personnel.

l. Government Modifications of Disposal Areas: The Government may perform modifications to its disposal areas during periods when they are not being used for work under this contract.

Section 35 20 23 Page 11

3.4 CONTROL OF DISPOSAL AREA EFFLUENT IN UPLAND DISPOSAL AREA

3.4.1 General

Monitor disposal area conditions to preclude excessive ponding as described in the Paragraph "Additional Requirements for Disposal Area", and maintain effluent quality as prescribed below. Review sluice height on a continuing basis to insure that the optimum height needed to satisfy both of these requirements are employed at all times. Raise the elevation of the crest of the sluice or stop pumping into the disposal area and permit the fill to settle, to ensure that the density of the mixture of suspended solids discharged over the sluice remains less than 4 grams per liter. In addition, the sluice height shall be managed in accordance with the special requirements described under paragraph "Sluice Management" below.

a. Do not allow the density of the effluent discharged over the sluice to exceed 4.0 grams/liter at any time.

b. Maintain the pH of the effluent between 6 and 9 standard units at all times.

3.4.2 Sluice Management

To prevent "floating" of the sluice during filling and ensure its proper performance, follow the special sluice management practices listed below.

Refer to the attached figure at the end of this section for sluice box nomenclature.

a. Fill the inlet box on each sluice with water to stabilize the box and prevent it from floating. Such filling shall be done before raising the entire sluice elevation (i.e. before boarding up the inlet box) and such that the following criteria is maintained at all times:

At no time shall the head difference (i.e., difference in water elevations) between the inside and outside of the inlet box be more than half the height of water outside the box. For example, if it is anticipated that there will eventually be 6 feet of water outside the box, first allow half as much water into the inlet box, i.e., 3 feet of water, before completely boarding up the inlet box.

b. Maintain the top of exterior sluice boards around the inlet box at the same elevation to the maximum extent possible.

c. Maintain the top of exterior sluice boards around the discharge box at least 8 inches, i.e., 2 boards minimum, above the top of the exterior flashboards around the inlet box.

d. Set the interior weir between the inlet and discharge boxes 1 to 2 feet lower than the elevation of the exterior flashboards around the inlet box.

e. Remove and properly dispose of all floating debris lodged in and around the sluice boxes.

f. In order to minimize leaks, place burlap bags or an approved equivalent between the flashboards to act as a gasket and seal gaps that may exist between the boards. Weight or wedge flashboards into

Section 35 20 23 Page 12 place to prevent them from floating.

3.4.3 Effluent Sampling and Testing

Monitor the effluent from the disposal area as described in this section.

Maintain awareness of the effluent quality by sampling throughout the operating period. Additional sampling and automated monitoring by the government will be conducted by a separate contract during peak sluice discharge. The Contractor shall ensure this work or associated equipment is not interfered with or damaged during sluice management activities.

3.4.3.1 Effluent pH

Sample effluent pH weekly or once per discharge, whichever is more frequent, using a grab sample.

3.4.3.2 Effluent Sampling and Testing

Take and test samples for density determination, and record the results.

Sampling shall be done once per week (or once per discharge, whichever is more frequent) using an 8-hour composite sample. Increase the minimum frequency of sampling at the sluice when effluent density increases or nears the maximum specified. Record density determinations, including times of sampling, on the Daily Report of Operations forms required in Paragraph "CONTRACTOR QUALITY CONTROL" of this section. Include the hydrometer readings (expressed in Grams/Liter) in the daily reports in RMS. Collect each sample at the sluice from the mixture flowing over the discharge box interior weir as shown on the attached figure. Make a composite sample by partially filling, without overflow, a one-quart container for five or six consecutive intervals such that a total of about 1 gallon is collected and combined in a bucket or other suitable container. Determine the composite sample density by the hydrometer method, no more than 5 minutes after collecting the first one-quart container sample, otherwise discard the sample and make up a new one.

Hydrometer Method: The hydrometer used to determine the composite sample density shall be a soil hydrometer conforming to ASTM E100, Hydrometer No. ASTM 152H, -5 to +60 grams per liter. This specified hydrometer reads density directly in grams per liter, so no other computations are required to determine density. Submit the proposed hydrometer brand and model for approval prior to commencing dredging operations. Use the hydrometer as specified by the manufacturer.

NOTE: The sampling required in this section is not to be confused with sampling and analysis that may be performed by others for the purpose of reporting data to Pennsylvania DEP.

3.4.4 Records

Submit records of disposal area effluent measurements and corrective action taken weekly. Weekly hand written results are to be given to the Government Inspector on site. Three (3) copies of a report of data collected is to be provided to the U.S. Army Corps of Engineers, Technical Support Branch within 10 days after the end of each month or after the completion of dredging.

Section 35 20 23 Page 13

3.4.5 Timber Flashboards

Prior to commencement of pumping, provide a sufficient number of flashboards for the sluice as required for the retention of dredged material under this contract and ensure that the entire sluice length is effective. Brush applied preservative treatment shall be available at the site and all cut surfaces shall be heavily brushed as specified in AWPA M4.

3.4.6 Continuing Effluent Control

Upon completion and acceptance of a work assignment, provide continuing, intermittent labor to ensure that effluent control is continued beyond the completion of dredged discharge into the disposal area. Continue the control, including the removal of flashboards, until water impoundment is reduced to that which existed prior to the commencement of disposal into this area. The time required for effluent control beyond completion and acceptance of the work assignment will not be considered part of the completion time for the contract.

3.5 OVERDEPTH, SIDE SLOPES, AND EXCESIVE DREDGING

3.5.1 Overdepth

Material removed from within an acceptance section or work assignment, to a depth of not more than 1 foot below the required depth, limited by a vertical plane through the required depth contour, will be estimated and paid for at the contract unit price for removal and disposal of material.

3.5.2 Side and End Slopes

a. No side or slopes are specified for this contract(box cut).

b. Dredging is required to a distance of 25 feet outside the channel limits when required dredging depth exists at the toe of the channel if applicable.

3.5.3 Excessive Dredging

Material taken from beyond the limits specified in the Paragraphs "Overdepth" and "Side and End Slopes", will be deducted from the total amount dredged as excessive dredging for which payment will not be made.

Nothing herein shall be construed to prevent payment for the removal of shoals performed in accordance with the applicable requirements of the Contract Clause "FINAL EXAMINATION AND ACCEPTANCE" and Section 01 30 00 ADMINISTRATIVE REQUIREMENTS, paragraph titled "SHOALING".

3.6 ESTIMATED QUANTITIES

The total estimated quantity of material necessary to be removed within the specified limits as shown on the drawings, including allowable overdepth and areas outside the channel and anchorage limits as previously specified, is as follows for each of the areas of work or work assignments:

BASE BID

Section 35 20 23 Page 14

Acceptance Station Req'd Dredging Overdepth Total Section to Station to 41' (CY) 41' to 42'(CY) Available (CY)

1 102+000 to 107+000(Red) 5,000 5,000 10,000 2 107+000 to 112+000(Red) 15,000 10,000 25,000 3 112+000 to 117+000(Red) 10,000 10,000 20,000 4 117+000 to 122+500(Red) 15,000 5,000 20,000 5 122+500 to 124+677(Green) 200,000 10,000 210,000 6 122+500 to 124+677(Red) 80,000 10,000 90,000 8 Fairless Turning Basin 50,000 20,000 70,000

Acceptance Station Req'd Dredging Overdepth Total Section to Station to 26' (CY) 26' to 27'(CY) Available (CY)

7 124+677 to 126+500 (Whole Channel) 15,000 10,000 25,000

TOTALS 390,000 80,000 470,000

Quantities shown by Acceptance Section are based upon the date of surveys shown on the contract drawings and may differ slightly from final before dredging survey (BDs) quantities based upon erosion and/or shoaling. The Contracting Officer reserves the right to modify and/or add additional Acceptance Sections between Station 102+000 and 124+700.

3.7 LIMIT OF DREDGING

3.7.1 General

The areas to be dredged in the Delaware River are the channel within the acceptance sections specified below and depicted in Appendix C51, as defined by the dredging prism specified in paragraphs titled: "OVERDEPTH, SIDE SLOPES, AND EXCESSIVE DREDGING" and "MEASUREMENT AND PAYMENT".

3.7.2 Quantity Acceptance

Clear each acceptance section or work assignment in its entirety to the required depth prior to acceptance of the work by the Government. If after-dredging surveys of a portion of an acceptance section or work assignment indicate dredging is required, and it was indicated by the before-dredging surveys, remove required material found to be remaining above the required depth, unless such dredging is waived by the Contracting Officer. Dragging of a bar or other device will be allowed.

Material removed as a result of redredging, within the dredging prism, will be paid for at the contract unit price and quantity as determined by the difference between initial before-dredging survey and the final after-dredging survey. In any portion of an acceptance section or work assignment, when the after dredging survey indicates dredging is required that was not indicated by the before dredging survey, remove such material to the required depth, unless waived by the Contracting Officer. Such work will be paid for at the contract unit price and any additional quantity calculation will be made based on the after-dredging surveys, provided the material is not determined by the Contracting Officer to be misplaced material.

Section 35 20 23 Page 15

3.8 DEBRIS REMOVAL

Remove debris that may be encountered during dredging operations. Exact locations, types, and quantities of debris is unknown. Debris removed from the dredged area shall be removed from the water. Disposal shall be the responsibility of the Contractor and disposal shall be outside the limits of Government property.

3.9 CONTRACTOR QUALITY CONTROL

Prepare, maintain, and submit daily, the Daily Report of Operations forms, and furnish signed copies thereof with the Quality Control Reports required in Section 01 45 00 QUALITY CONTROL. A sample Daily Report of Operations form is attached at the end of this Section. Further instructions on the preparation and submittal of this form will be provided at the Pre-Dredging Coordination Meeting. Submittals for the Daily Report of Operations will be available to the public.

3.10 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 surveyed by the Government. Remove shoals and lumps by dredging. 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 Contracting Officer. The Contractor will be notified when surveys are to be conducted and will be permitted to accompany the government survey party and to inspect the data and methods used in preparing the final estimate. When areas are found to be in a satisfactory condition, the work therein will be accepted as complete. Final estimates will be subject to deductions or correction of deductions previously made because of excessive overdepth, dredging outside or authorized areas, or disposal of material in an unauthorized manner. Should more than two surveys by the Government over an area be necessary by reason of work for the removal of shoals disclosed by a prior survey, the cost of such third and any subsequent survey operations will be charged against the Contractor. The rate of each day in which the Government plant is engaged in such survey operations and/or is enroute to or from the site or held, for the Contractor's convenience, at or near the site for these operations shall be $5,500.00, except on Saturday, Sunday and holidays when the rate shall be $6,000.00.

3.11 MEASUREMENT AND PAYMENT

3.11.1 Mobilization and Demobilization

All costs connected with the mobilization and demobilization of the Contractor's dredging plant and equipment will be paid for at the contract lump sum price for this item. Sixty percent of the lump sum price will be paid to the Contractor upon completion of his mobilization at the first work assignment area. The remaining forty percent will be included in the final payment for work under this contract.

3.11.1.1 Cost Data

In the event the Contracting Officer considers that the amount in this item (60 percent) which represents mobilization, does not bear a reasonable relation to the cost of the work in this contract, the Contracting Officer may require the Contractor to produce cost data to

Section 35 20 23 Page 16 justify this portion of the bid. Failure to justify such price to the satisfaction of the Contracting Officer, will result in payment of actual mobilization costs, as determined by the Contracting Officer at the completion of mobilization, and payment of the remainder of this item in the final payment under this contract. The determination of the Contracting Officer is not subject to appeal.

3.11.1.2 Mobilization and Demobilization Costs

All costs connected with the mobilization and demobilization of the Contractor's dredging plant and equipment as defined below shall be included in the contract lump sum price for the Bid Item titled, "Mobilization and Demobilization", as listed in the Bidding Schedule.

a. Mobilization shall include all costs for operations accomplished prior to commencement of actual dredging operations; i.e., transfer of dredge, attendant plant, and equipment to site; initial installation of pipe; preparation of disposal areas, including sluice and drainage structures; including construction of walkways at disposal areas as required; and other incidentals in advance of the actual dredging operations.

b. Demobilization shall include general preparation for transfer of plant to its home or standby base, removal of pipelines, cleanup of disposal area including the removal and disposal of all tires and trash/metal/debris resulting from the dredging operation. Damages to disposal area access roads must be repaired before contract end.

3.11.2 Disposal Area Costs

All costs in connection with the development and cleanup of the disposal area, including sluice and drainage structure work, and sluice pipe extensions, including furnishing, placement, and removal of the pipe extensions upon completion of work, shall be included in the contract lump sum price for the Bid Item titled "Mobilization and Demobilization", as listed in the Bidding Schedule. Maintenance of the disposal areas, effluent control and installation of flashboards and burlap bags, if necessary, on flashboards, shall be included in the respective contract unit price for the Bid Items titled "Removal and Satisfactory Disposal of Material" as listed in the Bidding Schedule.

3.11.3 Dredging Quantities

Dredging quantities will be conducted as follows:

3.11.3.1 Dredging - Channel Clearance Surveys

a. The material to be removed above project depth within each acceptance section or work assignment will be determined by a before dredging survey conducted by the Government prior to dredging. The sorted XYZ dataset will be generated from the edited multi-beam files utilizing the un-shifted average cell sounding contained within a 3 foot by 3 foot matrix. See Contract Drawings for the required depth template.

b. The material remaining above project depth within each acceptance section or work assignment will be determined by an after dredging survey conducted by the Government following the completion of an acceptance section by the Contractor. The sorted XYZ dataset will be generated from the edited multi-beam files utilizing the average cell sounding contained

Section 35 20 23 Page 17 within a 3 foot by 3 foot matrix. See Contract Drawings for required depth template.

c. Surveys will be conducted as outlined in EM 1110-2-1003 . Raw data will not be available, however, the edited multi-beam files will be available upon request and the sorted XYZ dataset provided to the Contractor.

d. The 3x3 average sorted XYZ dataset can be used for the calculation of square footage or dredging volumes.

3.11.3.2 Dredging - Volume Calculations

The total amount of material to be removed and paid for under the contract will be measured by the cubic yards in place. Measurement of the number of cubic yards in place will be made by computing the volume between the bottom surface shown by soundings of the before dredging survey and the final after dredging survey of the acceptance section once it has been cleared. The volume for measurement will include the material within the limits described in the paragraph "OVERDEPTH, SIDE SLOPES, AND EXCESIVE DREDGING", less any deductions that may be required for misplaced material described in the paragraph "CONDUCT OF DREDGING WORK" of this Section.

The volume of material removed will be generated by using the TIN (Triangulated Irregular Network) computation as outlined in the Hydrographic Survey Manual EM 1110-2-1003 . An XYZ file will be generated from the edited multi-beam data using the average sounding within the cell of a 3 foot by 3 foot matrix to perform the TIN volume calculations. All Raw multi-beam files are unavailable. All edited multi-beam files are available to the Contractor upon request. All sorted XYZ files used for computations will be provided to the Contractor. Payment for removal and satisfactory disposal of material will be made at the respective contract unit price for the Bid Items titled "Removal and Satisfactory Disposal of Material" as listed in the Bidding Schedule.

3.11.3.3 Dredging - Plotting

a. Delaware River: Plotting of before dredging and after dredging surveys will be the XYZ dataset generated from the 3x3 average dataset used to compute quantities utilizing the minimum sounding shifted to the center of the cell of a 15 foot by 15 foot matrix. The contour depicting the 3x3 average XYZ dataset will also be plotted.

b. The 15x15 minimum dataset generated for plotting cannot be used for the calculation of square footage and volumes.

3.11.3.4 Surveys for Acceptance

a. The Government will perform before dredging and after dredging surveys for each acceptance section and work assignment. Request surveys at least three work days in advance of the date for each survey (Saturdays, Sundays and holidays are excluded), and confirm the need by telephone between 0630 and 0700 hours on the day of each survey by calling the Technical Support Branch, O & M Section at 215-656-6750, and by email to both Jason.M.Gray@usace.army.mil and Stephen.A.Farrell@usace.army.mil. Once the surveys have been acquired an additional minimum of three days will be required for processing, plotting and volume computations.

b. The time for any redredging to remove shoals and for second and subsequent surveys in any acceptance section or work assignment is the responsibility of the Contractor, and must be accomplished within the

Section 35 20 23 Page 18 completion period established for the contract. The Contractor may accompany the survey party to observe if redredging is required. The Contracting Officer will notify the Contractor if any redredging is required.

3.11.3.5 Existing Conditions

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