W912BU22B0014_Specs-AM0001.pdf

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

15A. NAME AND TITLE OF SIGNER (Type or print)

30-105-04EXCEPTION TO SF 30

APPROVED BY OIRM 11-84

STANDARD FORM 30 (Rev. 10-83) Prescribed by GSA

FAR (48 CFR) 53.243

1. CONTRACT ID CODE PAGE OF PAGES

1 3

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

16C. DATE SIGNED

BY

16B. UNITED STATES OF AMERICA15C. DATE SIGNED15B. CONTRACTOR/OFFEROR

(Signature of Contracting Officer)(Signature of person authorized to sign)

8. NAME AND ADDRESS OF CONTRACTOR (No., Street, County, State and Zip Code) X W912BU22B0014

X 9B. DATED (SEE ITEM 11)

15-Sep-2022

10B. DATED (SEE ITEM 13)

9A. AMENDMENT OF SOLICITATION NO.

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

X The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offer is extended, X is not extended.

Offer must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended by one of the following methods:

(a) By completing Items 8 and 15, and returning 1 copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

12. ACCOUNTING AND APPROPRIATION DATA (If required)

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE

CONTRACT ORDER NO. IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(B).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

E. IMPORTANT: Contractor is not, is required to sign this document and return copies to the issuing office.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

*******************BID OPENING DATE IS NOT EXTENDED*****************

This amendment 0001 is issued to provide responses to RFI questions 01 to 11, and update of Specif ications Section.

(SEE CONTINUATION PAGE)

Please indicate receipt of this amendment on Standard Form (SOLICITATION, OFFER, AND AWARD) as Amendment No.001. Failure to acknowledge all amendments may be cause for rejection of the bid.

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

10A. MOD. OF CONTRACT/ORDER NO.

2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO.(If applicable)

6. ISSUED BY

3. EFFECTIVE DATE

26-Sep-2022

CODE

US ARMY ENGINEER DISTRICT, PHILADELPHIA

POC: ZAQUETTE EVERETT USACE, PHI

WANAMAKER BUILDING 100 PENN SQUARE EAST

PHILADELPHIA PA 19107-3390

W912BU 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE

See Item 6

FACILITY CODECODE

EMAIL:TEL:

W912BU22B0014

SECTION SF 30 BLOCK 14 CONTINUATION PAGE

SUMMARY OF CHANGES

RFI questions:

1. The specs show typical sections of a “sluice box”. Can the contractor design his own sluice box as part of the preparation of each disposal area?

ANSWER: After contract award, any requested changes, equal or better than presented in the contract documents, may be submitted through the Contracting Officer’s Representative for consideration.

2. Are there time of year restrictions on work can be performed in CDF #1 and #2?

ANSWER: Please see revised Specification Section 35 20 23 as part of this amendment for time of day and year restrictions.

3. Can we work 24/7 for the duration of the entire work in this contract?

ANSWER: Please see revised Specification Section 35 20 23 as part of this amendment for time of day and year restrictions.

4. Can the contractor choose which CDF, #1 or #2, he would like to use for hydraulic placement of dredge material from any section?

ANSWER: There are no restrictions as to which Acceptance Section can placed in either disposal area.

5. Please confirm that we are not to dredge the boat slips along the channel and what the offset is from the boat slips.

ANSWER: Limits of dredging is as shown on the contract drawings. No slip dredging is included. By USACE policy, no structures should be within 10 feet of the channel edges.

6. Please confirm that the dredging work can start this fall or next fall.

All dredging and disposal area work must be completed within the contract period of performance.

7. Please confirm that the draw and turn bridges are operational and will be able to allow passage of vessels/dredges and if this any cost for opening of any of the bridges.

ANSWER: The Savannah Road bridge is operational and there is no charge for openings, which are requested through DELDOT Traffic Management: 302-659-4600 with 24 hour notice. The DELDOT railroad bridge is currently being razed and may or may not be passable during the Period of Performance depending on the schedule of DELDOT’s contractor and/or the schedule of the awardee of this solicitation; hence the Option for Acceptance Section 5.

W912BU22B0014

8. Is there an incumbent?

ANSWER: This is a new requirement. There is no incumbent

9. If so, are they eligible to re-compete for this solicitation?

ANSWER: Not applicable as there is no incumbent.

10. Do you know if they plan to recompete?

ANSWER: Not applicable as there is no incumbent.

11. Just to confirm, does the project require (payment) bonding?

ANSWER: Bonding is required

(End of Summary of Changes)

This page was intentionally left blank for duplex printing.

Amendment No. 0001

IFB W912BU22B0014

14. DESCRIPTION OF AMENDMENT (continued)

a. REQUESTS FOR INFORMATION (RFI) WITH RESPONSES: RFI’s with responses, are attached to this amendment.

b. TECHNICAL SPECIFICATIONS:

(1) Section 35 20 23 – DREDGING: Please delete Section 35 20 23 in its entirety and substitute the revised Section, annotated Amendment No. 0001, attached hereto.

c. Please indicate receipt of this amendment on Standard Form 1442 (SOLICITATION, OFFER, AND AWARD) as Amendment No. 0001. Failure to acknowledge all amendments may be cause for rejection of the bid.

SECTION 35 20 23

DREDGING

PART 1 GENERAL

1.1 DEFINITION

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 the Contract Clause titled: DIFFERING SITE CONDITIONS.

1.2 REFERENCES

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

AMERICAN ASSOCIATION OF STATE HIGHWAY AND TRANSPORTATION OFFICIALS

(AASHTO)

AASHTO M 43 (2005; R 2009) Standard Specification for Sizes of Aggregate for Road and Bridge Construction

AMERICAN WOOD PROTECTION ASSOCIATION (AWPA)

AWPA U1 (2017) Use Category System: User Specification for Treated Wood

AWPA M4 (2015) Standard for the Care of Preservative-Treated Wood Products

AWPA P5 (2015) Standard for Waterborne Preservatives

ASTM INTERNATIONAL (ASTM)

ASTM E100 (2017) Standard Specification for ASTM Hydrometers

SOUTHERN PINE INSPECTION BUREAU (SPIB) )

SPIB 1003 (2014) Standard Grading Rules for Southern Pine Lumber

U.S. ARMY CORPS OF ENGINEERS (USACE)

EM 385-1-1 (2014) Safety and Health Requirements

Section 35 20 23 Page 1

Manual

EM 1110-2-1003 (2013) Hydrographic Surveying

U.S. DEPARTMENT OF COMMERCE (DOC)

DOC PS 20-10 (2010) American Softwood Lumber Standard

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

33 CFR 156 (2008) Navigation and Navigable Waters, 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

Submit at or before the pre-dredging coordination meeting, a plan for usage or modification of the Government-furnished disposal areas. Show the areas or portions thereof to be used, the locations of sluices and drainage structures, and the manner in which the dredged material will be distributed in the disposal areas, the manner in which the initial weir elevation/sluice height at the sluice is to be established at the beginning of the disposal operation, as well as the manor in which sluice boards will be adjusted during dredging operations. Include sluice walkway details and a site specific fall protection plan in compliance with this Section.

Discharge Pipe Support; G,COR

Submit a description of the proposed method for supporting the discharge pipe inside the disposal areas, 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.

Vessel and Equipment List; G,COR

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. Include the capacity of all scows in the equipment list. Also include in the list the survey vessel, survey crew, type of survey equipment, and software that may be used.

SD-02 Shop Drawings

Section 35 20 23 Page 2

Submerged Pipeline

Soundings or Sweepings; G , DO

Indicate pipeline location and installation details. Submit drawings of surveys during progress of work by soundings or sweepings.

SD-05 Design Data

Design Data; G, DO

SD-06 Test Reports

Daily Report of Operations; G,COR

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 are available to the public.

Daily Log of Surveys Performed; G,COR

When the Contractor conducts his own surveys of the contract work, a daily log of surveys performed shall be submitted. A sample 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).

DGPS Positioning

The real time positioning of the dredge shall be recorded, by DGPS, on a computer disk every 1 minute and submitted on a daily basis.

Daily Dredgehead Positioning Records; G,COR

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 hopper draghead, and/or 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 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

Section 35 20 23 Page 3 time as the Daily Operations Report.

Fuel Usage

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

Disposal Areas Effluent Measurements; G,COR

Submit daily, the records of disposal areas effluent measurements and corrective action taken.

Inspector's Report; G,DO

SD-07 Certificates

Fall Protection Inspection Report; G,COR

Timber for Flashboards and Sluice Box Walkways; G,COR

Certificates of compliance attesting that the timber flashboards and sluice box walkway timber conform to the requirements of this specification shall be submitted for approval.

Aggregate Material; G,COR

Submit certificates, obtained from all imported 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.

1.4 ORDER OF WORK AND DREDGING RESTRICTIONS

Unless otherwise directed by the Contracting Officer, dredging work shall commence at Acceptance Section #1 followed by the remaining Acceptance Sections #2 through #5. Dredging shall only be performed from 1 October through 31 March. Disposal Area Construction activities shall only be performed from 15 September through 15 May. All work, including dredging, shall only be preformed between 7 am and 7 pm, 7 days a week.

1.4.1 Plant and Equipment

Provide sufficient dredge plant and equipment capable of performing at the necessary production rate required to complete the project in the allotted time, and shall employ this equipment by continuously dredging from the start of the work until the completion of the job, except for allowable down time for movement of pipe, etc. Complete any site work required at the Government-furnished disposal areas in sufficient time so as not to delay any of the work. 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".

Section 35 20 23 Page 4

1.5 MATERIAL TO BE REMOVED

1.5.1 Hard Material

The removal of hard material is not included. Should hard material which cannot be removed without blasting be encountered, 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 hard material by special means at prices agreed upon and approved in accordance with Contract Clause: "DIFFERING SITE CONDITIONS".

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.

1.5.2 Character of Materials

a. The material to be removed to restore the depth within the limits called for in the specifications and Contract drawings, is that composing the shoaling that 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.

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. However, prior to bidding, the Contractor may, at his discretion and expense, conduct additional investigation to further determine conditions at the site.

1.6 SITE CONDITIONS

Bidders are expected to examine the site of the work, including the disposal areas and decide for themselves as to the conditions affecting their operations. The entire work site is designated as a hard hat area in accordance with EM 385-1-1 .

1.7 DIFFERENTIAL GLOBAL POSITIONING SYSTEM (DGPS) EQUIPMENT

The Contractor must have a differential GPS, and shall conduct his survey work in accordance with the requirements for a Class 1 Survey, as defined in the U.S. Army Corps of Engineers Hydrographic Surveying Manual EM 1110-2-1003 . Provide real time DGPS positioning of the dredge, on a computer screen during dredging operations, and have the capability of playback in 1 minute intervals. Record the dredge position on a disk every 1 minute and submit this to the Contracting Officer on a daily basis. Provide data in ESRI ArcGIS 10.x Shapefile format (.shp), including all components and extensions, or in a Spatial Data Standard compliant geodatabase. Real time positioning data shall include northing, easting, elevation, date and time of information.

1.8 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 . Surveys shall be performed by single transducer sounding techniques, multi-beam sweep type surveys or both. When using

Section 35 20 23 Page 5 single beam technology, the operating frequency will range from 190 to 210 Khz in hard bottom areas. When utilizing multi-beam technology, the operating frequency will range from 180 to 250 Khz in hard bottom areas.

In soft bottom areas, 24 KHz low frequency depth may be used. All fathometers shall be calibrated following procedures outlined in the aforementioned EM.

1.9 FUEL OIL HANDLING

Ensure that 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 other applicable laws, codes, and regulations.

1.10 GOVERNMENT PLANT

The Government reserves the right to utilize another plant in any of the work assignment areas during the contract period.

1.11 ENVIRONMENTAL PROTECTION REQUIREMENTS

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

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 DOC PS 20-10 . The timber shall be surfaced on four sides and the dress size shall conform to U. S.

Department of Commerce DOC PS 20-10 . 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.

2.1.1 Brush-Applied Preservative Treatment

AWPA M4.

2.2 BURLAP BAGS

Burlap bags used for sluice maintenance or sealing sluice flashboards shall be capable of withstanding sluice flows and shall not degrade during the course of the contract work.

2.3 AGGREGATE

Submit certification that any recycled material, which is being proposed for use as graded aggregate, is neither hazardous nor toxic.

2.3.1 Aggregate for Inlet Boxes

AASHTO No. 1 stone, in accordance with AASHTO M 43, or an approved equal.

Section 35 20 23 Page 6

PART 3 EXECUTION

3.1 STATUS UPDATE MEETINGS

Status update meetings between the Contractor, the Philadelphia District, and the State of Delaware are required. These meetings will take place at agreed upon intervals during the contract to discuss the placement activities as originally planned by the Contractor, proposed changes to the Contractor's operations plans and overall progress of the maintenance dredging contract (i.e. before and after surveys). The first meeting shall take place during the Pre-Dredging Coordination meeting and immediately proceeding any dredge activity.

3.2 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 areas and between the dredging plant and adjacent points on shore.

3.3 CONDUCT OF DREDGING WORK

3.3.1 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.

3.3.2 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.

3.3.3 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.

3.3.4 Dredging

Excavate dredge material by hydraulic dredging. Provide for safe transportation and disposal of dredged materials. Transport and dispose of dredged material in one of the Government-furnished disposal areas.

Contractor-furnished disposal areas will not be permitted under this

Section 35 20 23 Page 7 contract. The deposit of dredged materials in unauthorized places is forbidden. Comply with rules and regulations of local port and harbor governing authorities.

3.3.4.1 Hopper Dredging

Hopper dredging will not be permitted under this contract.

3.3.4.2 Hydraulic Dredging

Material excavated by hydraulic pipeline dredge shall be transported by pipeline to final discharge position in the approved disposal areas without the use of rehandling basins or placing in scows or other similar vessels.

3.3.4.3 Mechanical Dredging

Material excavated by mechanical dredge (bucket, drag, or dipper) will not be permitted under this contract.

3.3.4.4 Rehandling Basins

Rehandling basins will not be provided by the Government for this contract. All material shall be pumped directly to the disposal sites without the use of a rehandling basin.

3.3.4.5 Direct Pumpout Rehandling

When scows are unloaded without dumping, they shall have their contents pumped directly into the approved disposal areas by a means which will preclude any loss of material to the river or canal prior to deposit in the disposal areas. The location and development of the mooring for direct pumpout operations will be subject to approval by the Contracting Officer.

3.3.4.6 Misplaced Material

Material deposited in places other than those designated or approved by the Contracting Officer, or which escapes from such places, is prohibited, and payment will not be made. The Contractor may be required to remove such misplaced material in accordance with Contract Clause titled:

"OBSTRUCTION OF NAVIGABLE WATERWAYS" and deposit it where directed, at no additional cost to the Government.

3.3.4.7 Government Quality Control Monitor

The Government may place a Government monitor aboard the Contractor's dredge(s) or supporting vessels to monitor quality control conditions during dredging and disposal operations. See Section 01 30 00

ADMINISTRATIVE REQUIREMENTS, "ACCOMMODATIONS AND MEALS FOR GOVERNMENT

INSPECTORS".

3.3.4.8 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.

Section 35 20 23 Page 8

3.3.4.9 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, "SIGNAL LIGHTS".

3.3.5 Navigation Warnings

Furnish and maintain navigation warning signs along the pipeline.

3.3.6 Method of Communication

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

3.3.7 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.

3.3.8 Plant Removal

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

3.4 DEVELOPMENT AND OPERATION OF DISPOSAL AREAS

3.4.1 General

a. Dredged material shall be deposited in the Government-furnished disposal areas.

b. Disposal area work shall not begin prior to a disposal area prep meeting and site visit. Coordinate with the Contracting Officer at least 14 days prior to mobilization to disposal areas. A competent fall protection person, as defined in Section 01 35 26 and designated in writing, must be present at the sluice structure when the Contractor is working on the sluice structure (adding or removing boards, taking water samples, etc.).

c. Prior to the use or modification of the disposal areas, submit the disposal area plans specified in the Paragraph titled: "SUBMITTALS" to the Contracting Officer for approval. At least 7 days prior to the use of the disposal areas, contact Mr. Dan Kelly, at 215-656-6889. Maintain and repair all Government-owned land, roads, and facilities used under this contract. Conduct work in accordance with the approved disposal operations 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 structures and drainage facilities required.

d. Take necessary measures to ensure that the condition of the disposal areas, namely the dikes, do not deteriorate or become damaged due to the pumping of dredged material into the sites. Locate the end of all

Section 35 20 23 Page 9 discharge pipes such that the discharge does not scour the slope face or the toe of slope in the vicinity of the discharge area. Every precaution shall be taken to meet all of the requirements outlined in this specification in order to maintain the integrity of the disposal areas.

3.4.2 Construction and Maintenance of Disposal Areas

a. Existing retaining dikes are available for use. Make all repairs, strengthening, extensions and modifications to such facilities as are necessary, approved by the Contracting Officer, and as shown on the drawings, for confining the excavated material and for controlling disposal area effluent until acceptance of all work under the contract.

Construct other structures or use any means necessary to control the dredge effluent as required to meet these specifications. Do not excavate or disturb existing dikes in any way, unless otherwise approved by the Contracting Officer. Contracting Officer approval must be obtained prior to doing work in the disposal areas.

b. Maintain, repair and stabilize dikes, roads and structures used under the contract, and inspect the dikes on a daily basis to ensure their safety and stability. Restore all dikes, roads, and areas disturbed throughout work 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 areas throughout the contract. Existing inclinometers, piezometers and wells shall not be disturbed. Any instrumentation or well disturbed by the Contractor will be replaced by the Government at the Contractor's expense.

c. Contractor-furnished pipelines shall enter the disposal areas only within the limits shown on the contract drawings. The Contracting Officer reserves the right to have the pipelines extend beyond the discharge limits as shown on the contract drawings or to a specific location within the disposal areas, if required, for efficient management of the disposal areas, at no additional cost to the Government. The end of all discharge pipes shall be located inside the disposal area limits at a distance not less than 30 feet from the interior toe of the dike, measured normal to the dike centerline, unless noted otherwise. This length of pipe inside the disposal area shall be sufficiently and safely supported along the entire length by timber cribbing, an earthen embankment, pipe barrels or other means approved by the Contracting Officer. The Government reserves the right to make the disposal areas available for use by others when not in use as part of any work assignment under this contract. Obtain written permission from the COR prior to entering on or utilizing any property owned or leased by the Government other than the diked disposal areas.

d. Report apparent seepage, stability, or safety problems immediately to the Government Quality Assurance Representative, Authorized Contracting Representative (COR) and Project Manager.

e. A freeboard of two feet or more, measured vertically between the retained materials and/or water and the top of the adjacent confining dikes, shall be maintained at all times. If the required freeboard is not met, stop pumping into the disposal area until corrective means have been taken which are satisfactory to the Contracting Officer.

f. Pipe type sluices will not be permitted through exterior dikes, and at no time will the dredge pipe be permitted to enter the disposal area through an exterior dike. The hydraulic placing of perimeter dikes will not be permitted.

Section 35 20 23 Page 10

g. Modifications of the disposal areas shall be done so as to prevent 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. The dredged materials shall be distributed within the used portion of the disposal areas in a reasonably uniform manner so as to permit full drainage without ponding on the fill surface during and after fill operations.

h. Ensure that all sluice boxes have 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. Ensure all walkways and handrails adhere to section 21 and 24 of EM 385-1-1. Timber used to construct the walkways shall be in accordance with the requirements of paragraph "TIMBER FOR FLASHBOARDS AND SLUICE BOX WALKWAYS" of this section and in accordance with Section 21 of

EM 385-1-1 .

i. Prior to pumping material into the disposal areas, the existing sluice fall protection shall be inspected 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.

j. Provide a full body safety harness for employees and Government inspectors to use 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.

k. Provide a minimum of 2 personnel at the disposal areas when work (disposal or other) is being done at a disposal areas, and a generator with a light plant sufficient to light the sluice area during darkness.

The disposal area personnel shall have radio communication with the dredge at all times.

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

Inspections shall be conducted along the entire perimeter of the disposal areas and be concentrated on evaluating the condition of the dike to ensure its integrity. If signs of distress are noted during inspection, stop pumping of dredged material immediately and notify the appropriate Corps personnel. Typical signs of distress may include excessive seepage, fissures and slope failures.

m. Government Modification of Disposal Areas: The Government may perform modifications to its disposal areas during periods when they are not being used for the work under this contract. The Government-constructed embankments will enclose sufficient volume for retention of the pumped discharge for the production rates specified elsewhere in these specifications.

n. Government Pipelines and Sluices: Government-owned submerged and shore

Section 35 20 23 Page 11 pipelines will not be available for use by the Contractor. Be responsible for maintaining the existing sluices during the contract work. Prior to dredging operations, perform the following:

(1) Inspect Sluice boxes for damage and/or deteriorated flashboards and steel framework in the presence of the Contracting Officer. Realign or replace flashboards that are mis-aligned, damaged or deteriorated prior to deposition of dredged material into the facility, and repair deteriorated or damaged steel framework as directed by the Contracting Officer.

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

(3) If not already completely filled, the entire bottom of the inlet box shall be weighted 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. However, as soon as practicable, remove and replace deteriorated flashboards with new wood. Burlap bags or other approved materials may also be installed between flashboards to control seepage through the boards as directed by the Contracting Officer. 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.

3.5 CONTROL OF DISPOSAL AREA EFFLUENT

3.5.1 General

Monitor disposal area conditions to preclude excessive ponding and maintain effluent quality as prescribed below. Review sluice height on a continuing basis to ensure that the optimum height needed to satisfy both of these requirements is 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 above ambient background water total suspended solids levels. The ambient background level shall be taken prior to commencement of dredging operations in the presence of the Contracting Officer. The ambient background level shall be established from the average of three water samples taken in the vicinity of the proposed dredging area. In addition, the sluice height shall be managed in accordance with the special requirements described under paragraph "Sluice Management" below.

3.5.1.1 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:

Section 35 20 23 Page 12

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., minimum 2 boards, 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, wedge flashboards into place to prevent them from floating. If upon inspection, leaking still occurs, place burlap bags or an approved equivalent between the flashboards to act as a gasket and seal gaps that may exist between the boards as directed by Contracting officer. Approval must be granted by the Contracting officer prior to placement.

3.5.2 Effluent Sampling and Testing

Monitor the effluent from the disposal areas as described in this section. Maintain awareness of the effluent quality by sampling throughout the operating period. The sampling required in this section is not to be confused with sampling and analysis that is to be performed by others for the purpose of reporting data to the Delaware Department of Natural Resources and Environmental Control (DNREC).

3.5.2.1 Effluent Density

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

Take samples at the sluice as often as required and at least twice daily at times when the flow is at the maximum rate and after the dredge has been operating continuously for not less than the time required for solids in suspension to flow from the discharge pipe to the sluice. 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. Fax the hydrometer readings (expressed in Grams/Liter) daily to the US Army COE Philadelphia District Office, Operations Division, at 215-656-6922 or provide them directly to the Government Representative in the field.

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.

Section 35 20 23 Page 13

b. 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.

3.5.3 Records

Submit records of disposal area effluent measurements and corrective action taken, daily to the Contracting Officer.

3.5.4 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.

3.5.5 Continuing Effluent Control

Upon completion and acceptance of a work area, 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.

3.6 OVERDEPTH, SIDE AND END SLOPES, AND EXCESSIVE DREDGING

3.6.1 Overdepth

Material removed from within an acceptance section, 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.

3.6.2 Side and End Slopes

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

3.6.2.1 Excessive Dredging

Material taken from beyond the limits specified in the Paragraphs titled:

"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 Paragraph titled: "FINAL EXAMINATION AND ACCEPTANCE" of this section.

3.7 ESTIMATED QUANTITIES

The total estimated quantity of material necessary to be removed within the specified limits as shown on the drawings, including allowable

Section 35 20 23 Page 14 overdepth is as follows:

BASE BID WORK

Required Allowable Total Acceptance Dredging to Overdepth Available Section Station to Station 10 feet (CY) 10-11 feet (CY) (CY)

AS-1 -0+500 - 0+500 1,000 500 1,500

AS-2 5+500 - 7+514 6,500 2,400 8,900

AS-3 7+514 - 8+700 17,600 6,200 23,800

Required Allowable Total Acceptance Dredging to Overdepth Available Section Station to Station 6 feet (CY) 6-7 feet (CY) (CY)

AS-4 0+100 - 1+100 2,100 1,250 3,350

Base Bid Total 27,200 10,350 37,550

Required Allowable Total Acceptance Dredging to Overdepth Available Section Station to Station 6 feet (CY) 6-7 feet (CY) (CY)

AS-5 1+700 - 2+200 1,150 650 1,800

Base Bid and Option Total 28,350 11,000 39,350

NOTE: All sorted XYZ files used for computations will be provided to the Contractor upon request. The estimated quantities shown above and as listed on the Bidding Schedule are based on surveys conducted on the dates shown on the drawings. All depths specified for dredging are referenced to mean lower low water (MLLW). The Contracting Officer reserves the right to direct cessation of work in a particular area of work at any time during the contract period.

3.8 LIMIT OF DREDGING

3.8.1 General

The area to be dredged is the channel within the limits indicated on the contract drawings and specified in the Paragraph titled: "FINAL EXAMINATION AND ACCEPTANCE", and as defined by the dredging prism indicated in the Paragraphs titled "OVERDEPTH, SIDE AND END SLOPES, AND EXCESSIVE DREDGING" and "MEASUREMENT AND PAYMENT", of this Section.

3.8.2 Completion of Acceptance Sections

Complete dredging in each acceptance section 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 indicate dredging is required, and it was indicated by the before-dredging surveys, remove required material found to be remaining above the required depth, Section 35 20 23 Page 15 unless such dredging is waived by the Contracting Officer. Material removed as a result of redredging, within the dredging contour, 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. If after-dredging surveys of a portion of an Work Area indicate dredging is required, and it was not indicated by the before-dredging surveys, remove such material to the required depth, unless waived by the Contracting Officer. The Contractor will be paid for such work 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.

3.9 CONTRACTOR QUALITY CONTROL

Prepare and maintain Daily Report of Operations forms, and the scow discharge reports, and furnish signed copies thereof with the Daily Quality Control records required in Section 01 45 00 QUALITY CONTROL.

Daily Report of Operations forms are attached at the end of this Section.

Further instructions on the preparation and submittal of these forms will be provided at the Pre-Dredging Coordination Meeting.

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 examined by the Government by sounding or sweeping, or both. Remove shoals and lumps by dragging the bottom or 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 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 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 soundings or sweeping operations by the Government over an area be necessary by reason of work for the removal of shoals disclosed at a prior sounding or sweeping, the cost of such third and any subsequent sounding or sweeping operations will be charged against the Contractor. The rate of each day in which the Government plant is engaged in such sounding or sweeping 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 all 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 area. The remaining forty percent will be included in the final

Section 35 20 23 Page 16 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 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…