W912BU-16-B-0008_Specs-AM4.pdf

Offers 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 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 your 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.

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

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE

2. AMENDMENT/MODIFICATION NO. 3. EFFECTIVE DATE 4. REQUISITION/PURCHASE REQ. NO. 5. PROJECT NO. (If applicable)

7. ADMINISTERED BY (If other than Item 6) CODE

STANDARD FORM 30 (REV. 10-83)

Prescribed by GSA FAR (48 CFR) 53.243

FACILITY CODE

9A. AMENDMENT OF SOLICITATION

NO.

9B. DATED (SEE ITEM 11)

10A. MODIFICATION OF CONTRACT/ORDER NO.

10B. DATED (SEE ITEM 13)

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

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

12. ACCOUNTING AND APPROPRIATION DATA (If required) copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

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

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

CHECK ONE 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)

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.

15C. DATE SIGNED

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

16C. DATE SIGNED

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

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

PAGE OF PAGES

6. ISSUED BY CODE

8. NAME AND ADDRESS OF CONTRACTOR (No., street, county, State and ZIP Code) (X)

CODE

15B. CONTRACTOR/OFFEROR

(Signature of person authorized to sign)

16B. UNITED STATES OF AMERICA

(Signature of Contracting Officer)

NSN 7540-01-152-8070

Previous edition unusable

MAINTENANCE DREDGING, CHRISTINA RIVER, WILMINGTON HARBOR, DELEWARE

THIS AMENDMENT DOES NOT EXTEND THE 20 MAY 2016 BID OPENING DATE AT 11:00 A.M.

(CONTINUED)

E5CTCSGF

US ARMY ENGINEER DISTRICT, PHILADELPHIA

WANAMAKER BUILDING, 100 PENN SQUARE EAST

PHILADELPHIA, PENNSYLVANIA 19107-3390

US ARMY ENGINEER DISTRICT, PHILADELPHIA

POC: SANDI FLETCHER

WANAMAKER BUILDING, 100 PENN SQUARE EAST

PHILADELPHIA, PENNSYLVANIA 19107-3390

W912BU-16-B-0008

05/13/2016

04/14/2016

This page was intentionally left blank for duplex printing.

Amendment No. 0004

IFB W912BU-16-B-0008

14. DESCRIPTION OF AMENDMENT (continued)

a. REQUESTS FOR INFORMATION (RFI) WITH RESPONSES: The answers to the RFI’s issued as Amendment No. 0002 have been changed in response to confirmation that bidders have been experiencing extreme difficulty in locating a suitable source of material for the dike raising. RFI’s with new responses, annotated Amendment No. 0004, 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 35 20 23, annotated Amendment No. 0004, attached hereto.

c. DRAWINGS:

(1) Please delete the drawing C-101 in its entirety and substitute the revised drawing of the same number, with the latest revision date of 13 May 2016, attached hereto.

d. Please indicate receipt of this amendment on Standard Form 1442 (SOLICITATION, OFFER, AND AWARD) as Amendment No. 0004. Failure to acknowledge all amendments may be cause for rejection of the bid.

Bidders are reminded that the contract contains FAR 52.236-3 Site Investigation and Conditions Affecting Work, therefore the bidder is expected to take any steps reasonably necessary to ascertain the general and local conditions which will affect the work at the borrow areas and that the Government assumes no responsibility for any conclusions made by the Contractor regarding the borrow areas.

RFI# Request for Information Response

Will the Contractor be allowed to borrow material from within the Wilmington South Disposal Area for the dike raising? If not, can the Contractor use another Corps disposal site to borrow the material for the dike raising? Does the Corps have any suggested sites for the borrow material?

The Contractor will not be allowed to borrow material from within the Wilmington South Disposal Area. The Government-owned disposal facilities Oldmans, Pedricktown North, and Pedricktown South will be available to use for borrow material. The Corps does not have any other suggested sites.

REQUESTS FOR INFORMATION with RESPONSES Solicitation No. W912BU-16-B-0008

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 the Contract Clause entitled: DIFFERING SITE CONDITIONS. The contract work shall also include importing and placing earthen fill to raise the existing earthen dike in the Wilmington Harbor South Disposal Area to a minimum final crest elevation of 33 feet. See the drawings for details.

The work shall include, but not be limited to, importation, subgrade preparation, placement, grading, and compaction of soil. Imported fill may come from the Government-owned Oldmans, Pedricktown North, and Pedricktown South disposal facilities.

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 (2014) Use Category System: User Specification for Treated Wood

AWPA M4 (2011) Standard for the Care of Preservative-Treated Wood Products

AWPA P5 (2014) Standard for Waterborne Preservatives

ASTM INTERNATIONAL (ASTM)

ASTM D2103 (2010) Standard Specification for Polyethylene Film and Sheeting

ASTM D2487 (2011) Soils for Engineering Purposes (Unified Soil Classification System)

Section 35 20 23 Page 1

ASTM D422 (1963; R 2007; E 2014; E 2014)

Particle-Size Analysis of Soils

ASTM E100 (2014) ASTM Hydrometers

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

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

DELAWARE DEPARTMENT OF TRANSPORTATION (DelDOT)

DelDOT Specifications (2001; Rev Oct 2011) Standard Specifications

NEW JERSEY DEPARTMENT OF TRANSPORTATION

NJDOT Specifications (2007) Standard Specifications for Road and Bridge Construction

U.S. DEPARTMENT OF COMMERCE (DOC)

DOC PS 20 (2010) American Softwood Lumber Standard

SOUTHERN PINE INSPECTION BUREAU (SPIB)

SPIB 1003 (2002) Standard Grading Rules for Southern Pine Lumber

U.S. ARMY CORPS OF ENGINEERS (USACE)

EM 1110-2-1003 (30 Nov 2013) Hydrographic Surveying

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

1.3 ORDER OF WORK AND DREDGING TIME RESTRICTIONS

Unless otherwise directed by the Contracting Officer, the dredging work shall commence at the Delaware River end of the work area - Acceptance Section #4 and proceed upstream to Acceptance Section #1. All dredging under this contract shall be subject to the requirements specified in Section 01 57 20 ENVIRONMENTAL PROTECTION and the following seasonal time restrictions: Dredging will be prohibited between April 1 and June 15 annually to minimize impacts to migratory fish.

1.4 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 that has occurred since the channel was last dredged as noted in the Special Clauses. The character of the material is believed to be as indicated by the results of the Government-conducted sampling. An abstract of bottom samples is included in Section 00 73 40 of this specification.

Material typically dredged in the past consists of dark grey, very soft silt.

b. It is the Government's position that sufficient information has been

Section 35 20 23 Page 2 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.

1.5 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 entitled: SITE INVESTIGATION AND CONDITIONS AFFECTING THE WORK. The entire work site is designated as a hard hat area in accordance with EM 385-1-1.

1.6 FUEL OIL HANDLING

Assure that all fuel oil transfer operations to or from his 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 entitled: ACCIDENT PREVENTION, sufficient information to demonstrate compliance with 33 CFR 156 and other applicable laws, codes, and regulations.

1.7 DIFFERENTIAL GLOBAL POSITIONING SYSTEM(DGPS) EQUIPMENT

Provide a differential GPS, in accordance with the requirements for project classifications for "Navigation and Dredging Support Surveys" as referenced in the Corps of Engineers Hydrographic Survey Manual EM 1110-2-1003 and shall conduct his survey work in accordance with the requirements for a Class 1 Survey, as defined therein. Provide real time positioning on a computer screen during dredging, and have the capability of playback in 15 minute intervals. The position shall be recorded on a disk every 15 minutes and submitted to the Contracting Officer on a daily basis. The DGPS Positioning data shall indicate the position of the dredge.

1.8 HYDROGRAPHIC SURVEYS

Hydrographic surveys shall be conducted 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.

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.

1.9 DEFINITIONS

1.9.1 Satisfactory Materials

Satisfactory materials used to raise the dike shall be comprised of any materials classified by ASTM D2487 as CL, ML, CL-ML, CH, or MH.

Satisfactory materials for grading may include stones less than 8 inches in maximum dimension.

1.9.2 Unsatisfactory Materials

Materials which do not comply with the requirements for satisfactory materials are unsatisfactory. Unsatisfactory materials include trash, Section 35 20 23 Page 3 refuse, frozen material, debris, material classified as satisfactory which are saturated or contain excessive moisture and cannot be aerated sufficiently to be properly compacted, and material which contains excessive amounts of root and other organic matter, as determined by the COR. Contaminated materials shall not be imported to the site.

1.10 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. The following shall be submitted in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

NOTE: Submittals classified as "SD-01 Preconstruction Submittals" are submittals required to be submitted to, and approved by, the office indicated prior to mobilization to the contract work site. All other submittals, classified as "SD-02" through "SD-11," shall be submitted to, and approved or reviewed by, the office indicated prior to commencing the particular task to which the submittal is associated.

SD-01 Preconstruction Submittals

Disposal Area Plan; G,COR.

Submit to the Contracting Officer for approval, the plan for usage or modification of the Government-furnished disposal area. This plan shall show the areas or portions thereof to be used, the locations and cross-sections of proposed dikes, the locations of sluices and drainage structures, and the manner in which the dredged material will be distributed in the areas. Plans for Contractor-furnished rehandling basins and enclosures, including character of materials to be used, means of placement, and cross-sections of proposed dikes and other structures, shall also be submitted for approval by the Contracting Officer. The plan shall also include details for importing and placing material to raise the dike elevation. Include a construction schedule and details of personnel and equipment to be utilized. Include procedures that will be implemented to control the quality of the work to conform to the plans and specifications.

The plan shall also include details on how the Contractor will remove material from the Government-owned Oldmans, Pedricktown North, and Pedricktown South disposal facilities, if used.

Sluice Walkway Plan; G,COR.

Submit a plan of the proposed walkway.

SD-03 Product Data

Delivery Tickets for Imported Dike Fill; G,COR

Source for Imported Dike Fill; G, COR

Prior to purchase, submit the proposed source for the imported dike fill.

Equipment List; G,COR.

Submit for approval a complete list of all vessels and equipment to be used during the contract, including all dredging plants, supporting vessels, and equipment. The vessel list shall contain the types, the

Section 35 20 23 Page 4 numbers of each, the draft of each, and all other pertinent information.

The Contractor shall list the survey vessel, survey crew, type of survey equipment, and software that may be used.

SD-04 Samples

Imported Dike Fill; G, DO

Submit a 50 lb sample of the proposed dike fill to be imported.

SD-06 Test Reports

Grain Size Distribution Curves; G, DO

Submit grain size distribution curves from the source of the imported dike fill, in accordance with ASTM D422.

Daily Report of Operations; G,CO.

Prepare, maintain, and submit daily for approval, Daily Report of Operations forms, and furnish signed copies thereof with the Quality Control Reports required in SECTION 01 45 00, "QUALITY CONTROL", to the Contracting Officer. Daily Reports of Operations shall be faxed daily to the U.S. COE Philadelphia District Office. Copies of the Daily Report of Operations forms to be used are attached at the end of this section.

Further instructions on the preparation and submittal of the forms will be provided at the Pre-Dredging Coordination Meeting. Submittals for the Daily Report of Operations are available to the public.

Effluent Sampling and Testing; G,CO.

Records of disposal area effluent measurements and corrective action taken shall be submitted daily to the Contracting Officer.

DGPS Positioning; G,CO.

Records of position during dredging operations shall be recorded on disk every 15 minutes and submitted to the Contracting Officer on a daily basis.

Fall Protection Inspection Report; G,COR.

SD-07 Certificates

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 Certifications; G,DO

Furnish 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 should be performed before the material can be approved for use on this project.

Polyethylene Sheeting; G,COR

Section 35 20 23 Page 5

Certificates of compliance attesting that the polyethylene sheeting conforms to the requirements of this specification shall be submitted for approval.

PART 2 PRODUCTS

2.1 TIMBER FLASHBOARDS AND SLUICE BOX WALKWAYS

All 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. The timber shall be surfaced on four sides and the dress size shall conform to U. S.

Department of Commerce DOC 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.

2.1.1 Brush-Applied Preservative Treatment

Brush-applied preservative treatment shall be as specified in AWPA M4.

2.2 POLYETHYLENE SHEETING

ASTM D2103 and shall have a minimum thickness of 6 mils.

2.3 AGGREGATE

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

2.3.1 Crushed Aggregate Ramp for Discharge Pipe Road Crossings

Type "B" (Crusher Run) in accordance with Section 821 of the DelDOT Specifications.

2.3.2 Aggregate Fill for Inlet Boxes

Aggregate gradation size No. 57 in accordance with AASHTO M 43 or dense graded aggregate or recycled crushed concrete conforming to Section 901.10 of the NJDOT Specifications, or an approved equal.

2.4 ACCEPTABLE EQUIPMENT FOR DIKE WORK

The following criteria must be adhered to for operations in swamp-like conditions. Submit an equipment list of all equipment to be used during the contract. Include on the list the types, the numbers of each, and all other pertinent information.

2.4.1 Bulldozer

Bulldozers shall be a wide track low ground pressure type with a minimum of 185 net flywheel horsepower. The blade shall be a dirt-type or straight-tilt dozer type with a minimum capacity of 3.8 cubic yards. Power angle blades are not acceptable for this type of work. Machines such as a Caterpillar D6R-LGP, Caterpillar D6T-LGP, Komatsu D65P-12, John Deere 850C-II-CGP, Case 1850K-LGP, have successfully performed the work. Upon inspection of actual equipment onsite, a government representative shall make the final determination as to acceptability.

Section 35 20 23 Page 6

2.4.2 Excavator

Crawler Mounted Excavator. Whatever size bucket is used, the machine must be of adequate size and factory rated to perform its maximum capabilities with that bucket. For example, if a 2 cubic yard bucket is specified, the minimum size machine would be a Caterpillar 325 or industry standard equivalent such as a Komatsu 270LC-6, Case CX290B, John Deere 270LC, Volvo EC290, and Kobelco SK290LC or approved equal. Upon inspection of equipment a government representative shall make the final determination as to acceptability.

2.5 FILL MATERIALS

2.5.1 Satisfactory Materials

All fill materials used to raise the dike shall consist of satisfactory materials imported from off-site. Certify that imported materials are not contaminated, hazardous, or toxic. The Contractor shall not cut any existing perimeter or baffle dikes to obtain material, unless directed in writing by the Contracting Officer.

The imported dike fill typically consists of moisture-sensitive silts and clays. Appropriate measures shall be taken to remove excess moisture from the imported material through typical disking, stockpiling, windrowing, and aeration efforts. Provide adequate drainage to prevent ponding of water around stockpiles. Prevent build-up of excessive moisture in imported materials and allow wet stockpiles and lifts of fill to dry, as needed.

PART 3 EXECUTION

3.1 DIKE EMBANKMENT CONSTRUCTION

3.1.1 General

Unless otherwise specified or directed by the Contracting Officer, the embankment shall be constructed to the lines, grades, and slopes as shown on the drawings. Erosion of the constructed embankment shall be repaired within two working days. Raising of the dike shall be completed prior to beginning placement of dredged material.

3.1.2 Clearing, Grubbing, and Disposal of Vegetation

All vegetation such as phragmites, grasses, weeds, and brush shall be stripped and removed from the portions of the existing dikes and surrounding ground to be cut or covered as part of the proposed work. All stripped, cleared, and grubbed vegetation shall be disposed of on-site at a location approved by the Contracting Officer.

3.1.3 Subgrade Preparation

All surfaces to receive fill shall first be scarified to a depth of six inches before fill placement is started so that fill material will bond to existing material. Note that this scarified depth shall be considered part of the first loose lift of dike fill. Step, bench, or break up sloped surfaces steeper than 4H:1V so that fill material will bond with existing material, and to facilitate proper placement and compaction of fill in horizontal lifts. Subgrade and any successive surfaces to receive fill

Section 35 20 23 Page 7 shall not be muddy or excessively wet prior to fill placement. Allow wet subgrade surfaces to dry, as needed. Any subgrade or successive surface that is observed to pump or rut during earthwork operations shall be disked and dried prior to re-grading and compacting, or removed and replaced with suitable material.

3.1.4 Fill Placement and Compaction

Fill material shall be placed in horizontal loose lifts not to exceed 18 inches in thickness and compacted by minimum six (6) passes of a LGP D6 or larger dozer. Fill shall not be overly wet at time of compaction and shall be free of standing water and ruts. Any material that is observed to pump or rut during compaction shall be disked and dried prior to re-grading and re-attempting compaction, or shall be removed and replaced with suitable material. If, in the opinion of the Contracting Officer, the surface of any compacted layer is too smooth to bond properly with the succeeding layer, it shall be scarified to the satisfaction of the Contracting Officer. The Contractor shall schedule his daily operations so that all fill material placed for the dike embankment is compacted by not less than 6 passes of the approved dozer by the end of the work day.

3.1.5 Grade Tolerances

At all points a tolerance of 0.5 foot above the grades shown on the drawings will be permitted in the final dressing, provided that any excess material is distributed so that the crown of the embankment drains inward towards the disposal area and there are no abrupt humps or depressions in the width of the crown. However, this above grade tolerance may be modified at locations where, in the opinion of the Contracting Officer, such modifications will not impair the design or appearance of the embankment. At no point shall the final dressing be below the grades shown on the drawings.

3.1.6 Slides

If sliding of any part of the dike occurs prior to its acceptance, the Contractor shall repair the slide at the direction of the Contacting Officer. Repairs shall consist of providing additional fill material to restore the desired grades and slopes. If the slide is due to the fault of the Contractor, this work shall be performed at no additional cost to the Government.

3.1.7 Cold Weather Earthwork

It is anticipated that all work is to be completed during the summer and autumn months. If project work is to occur during winter, special cold weather earthwork practices and careful quality control measures may be required to facilitate proper construction. Under no circumstances shall fill be placed upon a frozen surface, nor shall snow, ice, or frozen earth be incorporated in the embankment. The Contracting Officer will have the authority to require the wasting of frozen material, at no additional cost to the Government.

3.1.8 Restrictions on Government-owned Disposal Facilities

Material for the dike embankment may be obtained from the infield area enclosed by the perimeter dike at the Government-owned Oldmans, Pedricktown North, and Pedricktown South confined disposal facilities. The nearest edge of any borrow area(s) shall be a minimum of 50 feet from the interior

Section 35 20 23 Page 8 toe of any perimeter dike or baffle dike, and a minimum of 50 feet from any sluice structure. The outside edges of borrow areas shall be sloped down into the excavation at maximum 3H:1V. Depth of borrow excavation shall be no deeper than 5 feet below surrounding grade.

3.2 DISPOSAL OF DREDGED MATERIAL

3.2.1 General

The material excavated shall be transported, deposited, confined and graded to drain as specified, within the disposal area shown on the drawings. The Government-furnished disposal area listed in the Special Clause entitled:

"PHYSICAL DATA", may be utilized for material dredged under this contract.

3.2.2 Misplaced Material

Material deposited in places other than those designated or approved by the Contracting Officer, or which escapes from such places, is prohibited. 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.

3.2.3 Hopper Dredging

Hopper dredging will not be permitted under this contract.

3.2.4 Hydraulic Dredging

Material shall be excavated by hydraulic pipeline dredging and shall be transported by pipeline to final discharge position in the approved disposal areas. All pipelines shall be kept in good condition at all times, and leaks or breaks along their length shall be promptly and properly repaired. All materials and water that leak from pipelines on or around access roads, shall be cleared, removed and placed within the limits of the disposal area.

3.2.5 Bucket Dredging

Bucket dredging will not be permitted under this contract.

3.3 DEVELOPMENT AND OPERATION OF DISPOSAL AREAS

3.3.1 General

Prior to the use or modification of the Government-furnished disposal area, submit the disposal area plan specified in the Paragraph entitled:

"SUBMITTALS" to the Contracting Officer for approval. Conduct the work in accordance with the approved plan; however, approval of the plan does not relieve the Contractor of his responsibility for the adequacy of the design and construction of the structures and drainage facilities required. All Contractor-owned dredging pipe used in the contract work shall be removed from the site by the Contractor within 30 days of completion of all dredging work.

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. Every precaution shall be taken to meet all of the requirements outlined in this specification in order to maintain the integrity of the disposal area. Stop pumping into the disposal

Section 35 20 23 Page 9 area and contact the Contracting Officer if seepage occurs on the exterior toe of the dike.

3.3.2 Construction and Maintenance

3.3.2.1 Disposal Area:

a. Existing retaining dikes, sluice boxes and drainage structures are available for use. 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. Clear the area within and around the sluices of all vegetation and debris. Construct other structures or use any means necessary to control the dredge effluent as required to meet these specifications. All work done in the disposal area shall be consistent with the submitted Disposal Area Plan and have prior approval from the Contracting Officer.

b. Maintain, repair and stabilize all land, roads and facilities used under this contract, to include dikes and other structures, and inspect the dikes on a daily basis to assure their safety and stability. Restore all dikes, roads, structures, and areas disturbed through 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 area throughout the contract. The existing instrumentation within the disposal area limits shall not be disturbed. Instrumentation disturbed by the Contractor will be replaced by the Government, at the Contractor's expense.

c. Contractor-furnished pipelines shall enter the disposal area only within the limits shown on the drawings. The Contracting Officer reserves the right to direct the extension of pipelines beyond the discharge limits shown on the contract drawings 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 the discharge pipe shall be located inside the disposal area limits at a distance not less than 50 feet beyond the interior crest of the dike, measured normal to the dike centerline, unless noted on the drawings or directed by the Contracting Officer. 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 such that the discharge does not scour the slope face or the toe-of-slope in the vicinity of the discharge area.

d. A crushed aggregate ramp shall be constructed as shown on the contract drawings to protect the discharge pipe where it crosses the existing access road. The crushed aggregate shall be compacted around the discharge pipe and the access ramp shall be constructed to the width of the access road.

3.3.2.2 Special Disposal Area Requirements

Borrow for diking material may be obtained from within the disposal area but not closer than 50 feet from the inside toe of the dike sections.

Wetting or drying of borrow material shall be performed as required to obtain optimum practical moisture content. Borrow material and the ground surface upon which it is to be placed shall be free of all debris, timber and accumulations of vegetation. Dike material shall be placed in approximately equal layers not exceeding 12 inches in loose thickness and

Section 35 20 23 Page 10 shall be compacted by the controlled traffic of spreading and/or hauling equipment over each layer. The borrowing of material from the area outside the existing perimeter dikes will not be permitted. Provide, at no additional cost to the Government, all 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.

3.3.2.3 Additional Disposal Area Requirements

a. A freeboard of a minimum of 2 feet or more, measured vertically from top of the dike at any location 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.

b. 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.

c. Development of the disposal area 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.

d. In accordance with the approved Sluice Walkway Plan, 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. Timber used to construct the walkways shall be in accordance with the requirements for the sluice box timber and in accordance with Section 21 of EM 385-1-1.

e. Prior to pumping material into the disposal area, inspect the existing sluice 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.

f. 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 the safety harness and attach it to the sluice framework using an appropriate approved device that conforms to EM 385-1-1 requirements.

g. Provide a minimum of 2 personnel at the disposal area when work (disposal or other) is being done at a disposal area, 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.

Section 35 20 23 Page 11

h. Perform routine inspections of the dike 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 area 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.

i. Government Sluices: If the Contractor uses the existing sluice for this work, he shall be responsible for its maintenance. Prior to dredging operations, the following shall be performed:

(1) The sluice box shall be inspected for damage and/or deteriorated flashboards and steel framework in the presence of the Contracting Officer. Flashboards that are deteriorated or mis-aligned shall be replaced/realigned prior to deposition of dredged material into the area, and deteriorated or damaged steel framework shall be repaired as directed by the Contracting Officer. Each sluice box shall be boarded up and sealed with plastic.

(2) All dirt/mud and debris shall be removed 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. Plastic sheeting may also be attached to the outside flashboards to control seepage through the boards as directed by the Contracting Officer. As soon as practicable, all deteriorated flashboards shall be removed and replaced 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.

3.4 CONTROL OF DISPOSAL AREA EFFLUENT

3.4.1 General

Monitor disposal area conditions to preclude excessive ponding as described in the Paragraph entitled: "Additional Disposal Area Requirements," and also to maintain effluent quality as prescribed below. Sluice height shall be reviewed by the Contractor on a continuing basis to insure 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. This shall include disposal areas where material is being hydraulically rehandled in accordance with the Paragraph entitled: "DISPOSAL OF DREDGED MATERIAL". In addition, the sluice height shall be managed in accordance with the special requirements described under paragraph "Sluice Management" below.

Section 35 20 23 Page 12

3.4.1.1 Sluice Management

To prevent "floating" of the sluice during filling and ensure its proper performance, special sluice management practices shall be followed as listed below. Refer to the attached figure at the end of this section for sluice box nomenclature.

a. The inlet box on each sluice shall be filled with water to stabilize the box and prevent it from floating. Such filling shall be done before raising the entire flashboard elevation 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, allow half as much water into the inlet box FIRST, i.e., 3 feet of water, before boarding up the inlet box to its required final elevation.

b. The top of all exterior flashboards around the inlet box shall be maintained at the same elevation to the maximum extent possible.

c. The top of all exterior flashboards around the discharge box shall be maintained at least 8 inches, i.e., 2 boards, above the top of the exterior flashboards around the inlet box.

d. The interior weir between the inlet and discharge boxes should be set 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, burlap bags or an approved equivalent shall be available for placement between the flashboards to act as a gasket to seal gaps that may exist between the boards. Also, flashboards must be weighed or wedged into place to prevent them from floating.

3.4.1.2 Effluent Sampling and Testing

Samples for density determination shall be taken, tested, and recorded.

Samples at the sluice shall be taken as often as required and at least twice daily at times when the flow is at 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. The minimum frequency of sampling at the sluice shall be increased when effluent density increases or nears the maximum specified. All density determinations, including times of sampling, shall be recorded on the Daily Report of Operations forms required in paragraph "CONTRACTOR QUALITY CONTROL" of this section. Hydrometer Readings (expressed in Grams/Liter) shall be faxed daily to the US Army COE Philadelphia District Office, Operations Division, at 215-656-6752 or provided directly to the Government Representative in the field. Each sample at the sluice shall be collected from the mixture flowing over the discharge box interior weir as shown on the attached figure. A composite sample shall be made up 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. The composite sample

Section 35 20 23 Page 13 density shall be determined by the hydrometer method no more than 5 minutes after collecting the first one-quart container sample, otherwise, the sample shall be discarded and a new sample shall be made up.

a. Hydrometer Method: The hydrometer used to determine the composite sample density shall be a soil hydrometer conforming to ASTM E100, Hydrometer No.

152H-05, -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. The proposed hydrometer brand and model shall be submitted for approval prior to commencing dredging operations. The hydrometer shall be used as specified by the manufacturer.

3.4.1.3 Records

Records of disposal area effluent measurements and corrective action taken shall be submitted daily to the Contracting Officer.

3.4.2 Timber Flashboards

Provide, prior to commencement of pumping, a sufficient number of flashboards for the sluice, as required, for the retention of dredged material under this contract and shall assure 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.

3.4.3 Continuing Effluent Control

Upon completion and acceptance of a work assignment, provide continuing, intermittent labor to assure that effluent control is continued beyond the completion of dredged discharge into the disposal area. Control, including the removal of flashboards, shall be continued 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 shall not be considered part of the completion time for the contract.

3.5 OVERDEPTH AND SIDE SLOPES

3.5.1 Overdepth

a. Dredging will be required to a depth of 35 feet MLLW (DATUM) plus 1 foot allowable overdepth, limited by a vertical plane through the required depth contour, within the contract work limits from Station 0+000 to Station 1+650.

b. Dredging will be required to a depth of 38 feet MLLW (DATUM) plus 1 foot allowable overdepth, limited by a vertical plane through the required depth contour, within the contract work limits from Station 1+650 to Station 6+236.

3.5.2 Side and End Slopes

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

Computation of payment quantities will be to the specified depth within the channel edges for all areas requiring dredging, with the following exceptions: Dredging will be required to a distance of 25 feet outside the North Channel edge, north turning basin edges, and entrance widening (flare), when required dredging depths exist inside the channel and basin, along the perimeter of the north edge.

Section 35 20 23 Page 14

3.5.3 Excessive Dredging

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

"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 provisions of the Special Clauses entitled: "FINAL EXAMINATION AND ACCEPTANCE" and "SHOALING".

3.6 ESTIMATED QUANTITIES

The total estimated quantity of material necessary to be removed within the specified limits as shown on the Contract Drawings, including allowable overdepth, areas outside the channel and turning basin limits as previously specified, and anticipated shoaling, is as follows:

ACCEPTANCE

SECTION

STATION TO

STATION

TO PROJECT

DEPTH

35' MLLW (CY)

ALLOWABLE

OVERDEPTH TO

36' MLLW (CY)

TOTALS

AS-1 0+000 to 1+650 45,603 19,017 64,620

ACCEPTANCE

SECTION

STATION TO

STATION

TO PROJECT

DEPTH

38' MLLW (CY)

ALLOWABLE

OVERDEPTH TO

39' MLLW (CY)

TOTALS

AS-2 1+650 to 3+600 114,365 42,639 157,004

AS-3 3+600 to 4+600 82,360 15,998 98,358

AS-4 4+600 to 6+236 64,292 16,523 80,815

SURVEY TOTALS 306,620 94,177 400,797

ESTIMATED SHOALING 114,660 10,823 125,483

TOTAL REQUIRED 421,280 105,000 526,280

TOTAL ESTIMATED BID QUANTITY 526,280

3.7 LIMIT OF DREDGING

3.7.1 General

The area to be dredged is within the limits indicated on the Contract Drawings and specified in the Special Clause entitled: "FINAL EXAMINATION AND ACCEPTANCE", as defined by dredging prism indicated in the Paragraphs entitled: "OVERDEPTH AND SIDE SLOPES" and "MEASUREMENT AND PAYMENT", of this section.

3.7.2 Quantity Acceptance

Complete all dredging requirements for each acceptance section prior to its acceptance by the Government. In any portion of an acceptance section, Section 35 20 23 Page 15 when the before dredging survey indicates dredging is required, remove material found to be remaining above the required depth by the after dredging survey, by dredging, unless such dredging is waived by the Contracting Officer. Dragging of a bar or other device will not be allowed. All material removed from within the dredging prism, whether accomplished by initial dredging or redredging, will be paid for at the contract unit price and as determined by the quantity calculation resulting from the difference between the before dredging survey and the final after dredging survey. In any portion of an acceptance section, 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 an additional quantity calculation will be made based on the after dredging survey, provided that the material is not determined by the Contracting Officer to be misplaced material.

3.8 CONTRACTOR QUALITY CONTROL

Prepare and maintain Daily Report of Operations forms, as specified in Paragraph "SUBMITTALS", and shall furnish signed copies thereof with the Quality Control Reports required in SECTION 01 45 00 QUALITY CONTROL, to the Contracting Officer.

3.9 MEASUREMENT AND PAYMENT

3.9.1 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 (60%) 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 (40%) will be included in the final payment for work under this contract.

In the event the Contracting Officer considers that the amount in this item (60%) 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.

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 Bid Item No. 1, "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 area, including sluices and drainage structures;

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 areas, and transfer of plant to its home or standby base.

Section 35 20 23 Page 16

3.9.2 Disposal Area Costs

All costs in connection with the development, maintenance and cleanup of the disposal area, including plastic sheeting, the sluice and drainage structures, shall be included in the contract lump sum price for Bid Item No. 1 "Mobilization and Demobilization", as listed in the Bidding Schedule.

Maintenance of the disposal area, and effluent control shall be included in the contract unit price for Bid Item No. 2, "Removal and Satisfactory Disposal of Material".

3.9.3 Dredging

The total amount of material removed and to be paid for under the contract, will be measured by the cubic yard 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 last survey made before dredging and the bottom surface shown by the soundings of surveys made as soon as practicable after the work specified in each acceptance section has been completed.