Amendment 0003_f - Revised Section 31 24 00_00 18 Beach Fill Placement.pdf

Fire Island Inlet to Jones Inlet, NY-Navigation FIIJI24

SECTION 31 24 00.00 18 Page 1

SECTION TABLE OF CONTENTS

DIVISION 31 - EARTHWORK

SECTION 31 24 00.00 18

BEACH FILL PLACEMENT

PART 1 GENERAL

1.1 MOBILIZATION AND DEMOBILIZATION

1.2 DREDGING OF FIRE ISLAND INLET, NY - BASIC WORK

1.3 MEASUREMENT AND PAYMENT

1.3.1 Beach Fill Placement

1.3.1.1 Original Drawings

1.3.2 Temporary Fencing

1.4 SITE CONDITIONS

1.5 SEDIMENTATION PERMITS

1.6 SUBMITTALS

1.7 QUALITY CONTROL

1.8 REPORTING REQUIREMENTS

1.8.1 Daily Report of Operations

1.8.2 Hopper Dredge Operation

PART 2 PRODUCTS

2.1 CHARACTER OF MATERIALS

2.2 DREDGING AREAS

2.2.1 Quantity

2.2.1.1 Gilgo Beach Placement

2.2.2 Fire Island Inlet Area Limits

2.2.3 Soundings

2.2.4 Slopes

PART 3 EXECUTION

3.1 ORDER OF WORK

3.2 PLACEMENT OF SAND FILL

3.2.1 Placement

3.2.2 Material Deposited Elsewhere

3.2.3 Dredge Material

3.2.4 Floatable Material

3.2.5 Final Beach Berm

3.2.6 Design Template

3.2.7 Dredge Discharge

3.2.8 Placement of Dredged Material

3.2.9 Removal and Placement of Material

3.3 PLANT

3.3.1 Scows

3.3.2 Hydraulic Pipelines

3.3.3 Marking of Floating Dredge Pipelines

3.3.4 Dredge Pipelines Crossing Navigable Channels

3.3.5 Submerged Pipelines

SECTION 31 24 00.00 18 Page 2

3.3.6 Road Crossings

3.3.7 Towing Vessels

3.4 DREDGE LOCATION CONTROL

3.4.1 Dredging Depth Monitoring Equipment

3.5 NOTIFICATION OF ON-SHORE BARGE OPERATION

3.6 BUOY REMOVAL

3.7 TEMPORARY FENCES

3.7.1 Land Booster Pumps

3.7.2 Beach Access Ramps

3.7.3 Sand Fence

3.7.4 Removal of Temporary Fencing

-- End of Section Table of Contents --

SECTION 31 24 00.00 18 Page 3

SECTION 31 24 00.00 18

BEACH FILL PLACEMENT

PART 1 GENERAL

1.1 MOBILIZATION AND DEMOBILIZATION

Mobilization shall include all costs for operations accomplished prior to commencement of actual dredging operations, such as transfer of dredge and attendant plant and equipment to site, initial installations of pipe, preparation of beach fill areas, and other incidentals in advance of the actual dredging. Demobilization shall include general preparation for transfer of plant to its home base, removal of pipelines, cleanup of beach fill areas, and transfer of plant to its home use. The cost of work other than mobilization and demobilization of the Contractor's dredging plant and equipment shall not be included in this item. For payment for Mobilization and Demobilization see contract clause 00700-89.

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 job price for this item. Sixty percent (60%) of the lump sum price will be paid to the Contractor upon completion of his mobilization to the work site. The remaining forty percent (40%) will be included in the final payment for work under the contract.

In the event the Contracting Officer and/or Contracting Officer Representative 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 and/or Contracting Officer Representative may require the Contractor to furnish cost data to justify this portion of the bid. Failure to justify such price to the satisfaction of the Contracting Officer and/or Contracting Officer's Representative will result in payment of actual mobilization costs as determined by the Contracting Officer and/or Contracting Officer Representative, 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 and/or Contracting Officer Representative is not subject to appeal.

1.2 DREDGING OF FIRE ISLAND INLET, NY - BASIC WORK

The Basic Work beach placement to be done under these specifications for the "Fire Island Inlet and Shores Westerly to Jones Inlet, NY Beach Erosion Control and Navigation Project" will be the dredging of the Fire Island Inlet Channel and Deposition Basins with placement of the dredged sand along the shoreline of Gilgo Beach, as indicated on the Contract Drawings.

Approximately 750,000 to 1,4500,000 cubic yards of sand will be placed along 18,000 linear feet of Gilgo Beach shoreline (basic plus options), as indicated on the Contract Drawings.

SECTION 31 24 00.00 18 Page 4

1.3 MEASUREMENT AND PAYMENT

1.3.1 Beach Fill Placement

The total amount of material acceptably placed on the beach (from the Fire Island Inlet Channel and Deposition Basin) is to be paid for at the contract unit price as shown on the price schedule (Section 00 10 00) and shall be measured by the cubic yards in place on the beach by computing the volume between the beach surface shown by a survey made before filling and beach surface shown on a survey after filling. The reference datum shall be NAVD. The Basic Work must be completed before Optional Work at Overlook Beach can be performed.

No payment shall be made for material placed:

(1) Which was obtained from outside the designated dredging area or below the maximum dredging limit of the dredging area, except as directed by the Contracting Officer or his representative.

(2) In excess of the quantity to the design grade plus the 0.5-foot tolerance.

(3) For the extent of the project as shown on the contract drawings, above EL. +8.0 ft. NAVD plus tolerance; beyond the point where the 1 on 20 slope line from EL. +8.0 ft. converts to a 1 on 15 slope line at -1.0 EL.

NAVD plus tolerance.

Original and Final Surveys

The Contractor shall make original before-fill and final after-fill surveys under the supervision of the Contracting Officer's Representative and must make computations to determine the quantities of material placed on the beach for acceptance.

Surveys for Progress Payments

The Contractor will make any surveys for periods for which progress payments are requested and must make the computations based on these surveys.

Initial and Final Surveys

Initial and final surveys for acceptance will be taken immediately prior to and after fill placement. Before fill, surveys must not be taken more than 14 days prior to fill placement. Surveys will be taken on parallel profile lines (ranges) spaced at a maximum of 100-foot interval. The minimum stationing interval will be 10 feet or at breaks in slope.

The Contractor must conduct the original and final surveys, with the presence of Government representative, and make the computations based on

SECTION 31 24 00.00 18 Page 5 them. The Contractor must conduct the surveys for any periods for which progress payments are requested and must make the computations based on these surveys. All survey conducted by the Contractor must be done by a New York Licensed surveyor and certified hydrographer subjected to approval by the Contracting Officer.

- The Contractor must be responsible to conduct all surveys. The Contractor must maintain work sections - a pre-construction and final acceptance section surveyed while construction is taking place in between. The pre-construction sections should be maintained at a minimum 300 feet ahead of the fill placement. The Contractor must make such computations as are necessary to determine the quantities of work performed or finally in place and submit the computation for Government approval.

- Promptly upon completing a survey, the Contractor must furnish the originals of all field notes and all other records relating to the survey or to the layout of the work to the Contracting Officer, who must use them as necessary to determine the amount of progress payments. The Contractor must retain copies of all such material furnished to the Contracting Officer or his representative. (FAR 52.236-16)

For Beach Fill Placement:

The Contractor will coordinate with the Contracting Officer's Representative to maintain work sections. The Contractor will perform preconstruction surveys between 500 feet and 1500 feet in advance of the last acceptance station but not more than 14 days prior to fill placement.

The surveys must be performed in 100-foot increments. Acceptance surveys must be performed when 500 linear feet of beach is dressed and graded to template.

1.3.1.1 Original Drawings

All original drawings that are submitted to the Contracting Officer will be accompanied by three prints of each.

1.3.2 Temporary Fencing

No separate payment shall be made for temporary fencing, and all costs in connection therewith shall be included in the contract unit price for the work.

1.4 SITE CONDITIONS

Bidders are expected to examine the site of the work, including the placement areas and decide for themselves the conditions affecting their operations prior to submitting their bids. Records of previous dredging operations are available at the U.S. Army Engineer District, New York, Operations Division, Operations Support Branch, Technical Support Section, Room 16-400, 26 Federal Plaza, New York, N.Y. 10278-0090. See Contract Clause entitled: "SITE INVESTIGATION AND CONDITIONS AFFECTING THE WORK"

(FAR 52.236-3).

1.5 SEDIMENTATION PERMITS

No local governmental sedimentation or erosion control permits are required for this work except that as required in accordance with Contract Clause entitled: "PERMITS AND RESPONSIBILITIES" (FAR 52.236 7).

SECTION 31 24 00.00 18 Page 6

1.6 SUBMITTALS

The Contractor shall submit for approval, by the Contracting Officer and/or Contracting Officer Representative, his plan for development of any contractor-furnished placement areas or any modification to the Government furnished placement area. This plan shall show areas or portions thereof to be used. The plan shall also show the manner in which the dredged material will be distributed in the areas. Such plans shall be provided by the contractor at the Preconstruction Conference. If the plan is not accepted the Contractor is to perform the work in accordance with the specifications.

1.7 QUALITY CONTROL

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

1) Dredging, including suitability of dredged material and manipulation and control of the dredge discharge.

2) Placement of sand fill material, including continuity and order of placement; distribution of material and measures used to control loss of material.

b. The Contractor will have a "NOTICE TO MARINERS" published by the Coast Guard 30 days prior to start of work.

c. Placement Plan: The Contractor shall submit for approval his placement plan at the Preconstruction Conference. The placement plan shall include the particular site(s) to be utilized, all special conditions (i.e., NYSDEC, etc.) specific to sites(s) being used, contractor access to the site(s) locations and cross-section of existing and proposed dikes, maximum elevations and quantities of placement material for each site, weir and drainage structure locations, manner in which the dredged material will be distributed in the areas, etc. Approval of the placement plan by the Contracting Officer or Contracting Officer Representative is required prior to placement site(s) preparation. The Contractor shall conduct his work in accordance with the Placement Plan, however, approval of the plan for development of the placement area does not in any manner relieve the Contractor of his responsibility for the adequacy of the design and construction and drainage facilities required. In addition, the Contractor shall also submit at the pre-construction meeting, his plan for road crossings of the discharge pipeline. The contractor shall be responsible for securing the appropriate permits for any road crossings of discharge pipeline or similar activities and may not begin work until such permits are received from the appropriate agencies.

d. Pre-Construction Site Visit: Prior to actual construction of any placement site, the Contractor and the Contracting Officer and/or Contracting Officer Representatives shall visit the site(s) for the purpose of delineating areas of access avoidance (cultural resource and/or wetland concerns).

e. Construction/Maintenance of Containment Structure. The Contractor shall construct all retaining dikes, waste weirs and drainage structures as are necessary for confining the dredged material and for controlling placement area effluent until acceptance of all work under the contract.

SECTION 31 24 00.00 18 Page 7

f. Protection of Structures and Adjacent Areas. The contractor shall be responsible for the maintenance, repair and stability of all dikes, roads and structures, used by him under the contract. The Contractor shall restore all dikes, roads, and areas he disturbs through his operations to a satisfactory condition, as approved by the Contracting Officer or Contract Officer Representative, at no additional cost to the Government.

g. Inspection of Structures and Adjacent Areas. The Contractor shall inspect all dikes, roads, waste weirs, and adjacent areas utilized during this operation on a daily basis to assure their safety and stability. The Contractor shall include these inspections in his daily quality control report. The inspection shall include but not be limited to structures, equipment, safety, security, drainage and seepage.

h. Reporting Requirements. The Contractor shall maintain a daily written record of all placement site operations. This requirement shall be made a part of the Contractor's Quality Control Plan and each record shall be included in the Contractor's Quality Control Report.

i. Containment Structure Restoration. The Contractor shall restore any feature of any containment structures as required to prevent the escape of dredged material from the placement site on to adjacent areas.

j. Control of Placement Area Effluent. The contractor shall monitor and control placement area conditions and placement effluent quality as prescribed in these specifications. The Contractor's Quality control Plan shall identify monitoring requirements and measures, which will be taken to control placement area conditions to insure effluent quality meets the requirements identified in the Water Quality Certificates (Section 00 90 02).

k. New York State Water Quality Certifications. The contractor shall comply with all requirements identified in the NYSDEC Water Quality Certificate (WQC) including all special conditions. A copy of the WQC is included in Section 00 90 02 of this specification.

l. Removal of Containment Area Structures. Any structures (i.e., weirs, pipeline, etc.) installed by the Contractor for use in his placement operations shall be removed and the contractor shall repair and stabilize all areas affected by the removal of these structures as approved by the Contracting Officer.

1.8 REPORTING REQUIREMENTS

1.8.1 Daily Report of Operations

The Contractor will, on Eng. Form 4267, be required to prepare and maintain a daily report of operations and inspections and furnish copies thereof to the Contracting Officer or Contracting Officer Representative. All the forms prescribed for the required information are in SECTION 35 20 23.

Further instructions on the preparation of the report will be furnished at a pre-construction conference. Attached to the form, the Contractor shall submit a plan of the dredging area indicating the location, depth and extent of his dredging operations for that day.

1.8.2 Hopper Dredge Operation

When a hopper dredge operation is used, the Contractor will submit daily records of hopper loads, including tonnages of empty and fully loaded conditions prior to pumpout. For all types of dredge operations the

SECTION 31 24 00.00 18 Page 8

Contractor will furnish production meter records (using properly calibrated instruments) of suctionline densities and pipeline velocities. Production meter records and loadmeter records must be cataloged either by time of day or load number.

PART 2 PRODUCTS

2.1 CHARACTER OF MATERIALS

The material to be removed to gain the depth within the limits called for in these specifications and drawings is material that has shoaled in the area since last dredged to the authorized dimensions. Results of grain size analyses performed on samples collected in the vicinity of the project area have indicated that the material to be deposited is predominantly sand (greater than 95% sand) and therefore compatible for beach placement.

2.2 DREDGING AREAS

2.2.1 Quantity

2.2.1.1 Gilgo Beach Placement

A sufficient quantity of material suitable for the beach fill is available from the Fire Island Inlet Navigation Channel and Deposition Basins shown on the Contract Drawings. The Inlet is located approximately 3 miles East of Gilgo Beach Placement Areas.

2.2.2 Fire Island Inlet Area Limits

All material shall be dredged from within the designated dredging area(s).

In the event any portion of the dredging area yields material unsuitable for use on the beach, the Contracting Officer, or Contracting Officer Representative, may direct that the depth of excavation be changed or that the excavating equipment be moved to another portion of the dredging area that will yield suitable material. Under no circumstances shall material be obtained from outside the established limits of the dredging area. Should it be determined that an area outside the limits of the designated dredging area was used for borrow, the Contractor shall restore such area to original condition.

2.2.3 Soundings

Soundings in the dredging area are shown on the drawings. Dredging in the designated dredging area will be allowed to the depths indicated on the drawings.

2.2.4 Slopes

The dredge cuts in the dredging area shall not have side slopes steeper than 1 on 3.

PART 3 EXECUTION

3.1 ORDER OF WORK

See Paragraph 3.2.1 of "DREDGING", Section 35 20 23 .

SECTION 31 24 00.00 18 Page 9

3.2 PLACEMENT OF SAND FILL

3.2.1 Placement

The material dredged from the designated dredging area shall be placed on the beach fill area to the specified limits and cross sections shown on the drawings provided. The material shall be deposited as evenly as practicable by the hydraulic method to form a comparatively smooth and uniform beach surface. A tolerance of 0.5 feet above and below Elevation +8.0 feet NAVD, measured vertically, will be allowed and paid for the basic work.

3.2.2 Material Deposited Elsewhere

Any material that is placed elsewhere than in places designated or approved by the Contracting Officer, or Contracting Officer Representative, will not be paid for, and the Contractor may be required to remove such material, and placed it where directed, at his expense.

3.2.3 Dredge Material

Dredge material shall be pumped directly from the dredging vessel to the beach placement area. No bottom placement and re-handling will be allowed.

Dredge discharge shall be manipulated and controlled by the Contractor in such a manner that a minimum of shaping by mechanical equipment will be required and a minimum amount of material will be lost.

3.2.4 Floatable Material

All floatable material excavated, including, without limitation, wood and tires, shall be disposed of at an existing approved upland disposal area.

Should the Contractor encounter floatable material, a copy of a letter granting the permission of appropriate authorities to use an existing approved upland disposal area shall be submitted to the Contracting Officer and/or Contracting Officer Representative.

3.2.5 Final Beach Berm

The final beach berm of placed fill under the Basic work shall be shaped above El. +3.0 to El. +8.5 ft NAVD by bulldozing or other approved means as required, to provide the design beach sections shown on the drawings. No reshaping of the existing beach, which is above the lines and grades of the design section will be permitted.

3.2.6 Design Template

Beach Fill (Placement Area), Basic Work: The beach fill at Gilgo Beach shall consist of one (1) berm. The berm shall extend 260 feet seaward from the baseline (southern edge of boardwalk) at an elevation of +8.0 feet NAVD from baseline station 93+00 to approximately baseline station 0+00. A seaward slope of 1 vertical on 20 horizontal shall extend from the seaward end of the berm to -1.0 feet NAVD, then 1 vertical and 15 horizontal shall continue to the ocean bottom (grade). The beach fill shall be placed with a taper of 300 feet east of station 93+00, if Option 1 is not exercised, and shall be completed with a 300 feet taper west of the designated end station. The berm shall tie into the exiting dune along the Gilgo Beach shoreline.

If the design template cannot be achieved at the toe of the section, then a compensated slope to offset voids in the construction fill template will be

SECTION 31 24 00.00 18 Page 10 allowed. The Contractor must report to the Contracting Officer or the Contracting Officer Representative the inability to achieve the design template within two days of placement. Such excess material shall be placed below Elevation +3.0 feet NAVD and above elevation -1.0 ft. NAVD; and the payable quantity shall not exceed the deficiency in template volume.

The contractor is required to perform a survey of the entire placement area prior to commencement of dredging to determine if the beach design template requires any modification.

The placement area shall be surveyed at 100-foot increments by the Contractor prior to and subsequent to the placement of dredged material.

These profiles are subject to change, depending on the beach condition at the time of construction.

If the design template cannot be achieved at the toe of the section, then a compensated slope to offset voids in the construction fill template will be allowed. Such excess material shall be placed below elevation +3.0 ft NAVD above the toe.

The contractor shall not exceed past the limits of the contractor work area, as shown on the contract drawings. No disturbance of dune or dune vegetation allowed.

Option 1 (Gilgo Beach Placement)

Beach Fill at Gilgo Beach shall consist of one (1) berm with a width of 260 feet from the baseline (southern edge of boardwalk) at an elevation of +8.0 feet NAVD from baseline station 93+00 to baseline station 125+35.16. A seaward slope of 1 vertical on 20 horizontal shall extend from the seaward end of the berm to -1.0 feet NAVD, then 1 vertical and 15 horizontal shall continue to the ocean bottom (grade).

Option 2 (Gilgo Beach Placement)

Beach Fill at Gilgo Beach shall consist of one (1) berm with a width of 230 feet from the baseline (southern edge of boardwalk) at an elevation of +8.0 feet NAVD from baseline station 125+35.16 to baseline station 143+00. A seaward slope of 1 vertical on 20 horizontal shall extend from the seaward end of the berm to -1.0 feet NAVD, then 1 vertical and 15 horizontal shall continue to the ocean bottom (grade).

Option 3 (Gilgo Beach Placement)

Beach Fill at Gilgo Beach shall consist of one (1) berm with a width of 230 feet from the baseline (southern edge of boardwalk) at an elevation of +8.0 feet NAVD from baseline station 143+00 to baseline station 166+00. A seaward slope of 1 vertical on 20 horizontal shall extend from the seaward end of the berm to -1.0 feet NAVD, then 1 vertical and 15 horizontal shall continue to the ocean bottom (grade).

Option 4 (Overlook Beach Option)

Beach placement at Overlook Beach shall consist of one (1) berm, covering

0.19 miles along the beach, with a variable width. The berm shall have an elevation of 8.5 feet (NAVD) plus 0.5 feet tolerance. A seaward slope of 1 vertical on 13 horizontal shall extend from the seaward end to the ocean bottom.

Option 5 (Overlook Beach Option)

SECTION 31 24 00.00 18 Page 11

Beach placement at Overlook Beach shall consist of one (1) berm, covering

0.19 miles along the beach, with an increase in width from Option 1 (variable width). The berm shall have an elevation of 8.5 feet (NAVD) plus

0.5 feet tolerance. A seaward slope of 1 vertical on 13 horizontal shall extend from the seaward end to the ocean bottom.

The contractor is required to perform a survey of the placement area prior to commencement of dredging to determine if the beach design template requires any modification.

3.2.7 Dredge Discharge

It is intended that dredge discharge shall be manipulated and controlled by the Contractor in such a manner that a minimum of shaping by mechanical equipment will be required and a minimum amount of material will be lost.

3.2.8 Placement of Dredged Material

Placement of dredged material on the beach fill area shall be subject to the following conditions:

(1) Any discharge pipeline crossing navigation channels must be submerged so that sufficient depth for navigation exists.

(2) Such discharge pipeline must be marked by signs, lights or other devices to insure safety to navigation by day and by night. All of these devices shall be in complete accordance with Coast Guard regulations. The contractor shall provide a written discussion of pipeline markings in the Accident Prevention Plan (Section 01 35 26).

(3) The discharge pipeline shall be arranged as approved by the Contracting Officer or his representative.

(4) It is expected that in placing the sand fill hydraulically, most of the silt and other fines being pumped will be washed into the ocean and dissipated by wave action. Ponding of the dredge effluent will not be allowed. However, baffles or dikes to control the flow of the dredge effluent will be required. The final seaward slope of the sand fill to be placed below El. +3.0 ft NAVD shall be the uncontrolled hydraulic slope of the material placed by the dredging process, estimated to be a 1 vertical to 20 horizontal until -1.0 feet, then slope down 1 vertical to 15 horizontal to the ocean bottom. The dredge effluent shall in all cases return directly to the ocean and not to the inshore side of the fill.

(5) If necessary, a temporary dike shall be constructed at the inshore limit of fill to prevent the dredge effluent from extending beyond the contract limits.

(6) Tracked vehicles shall be operated on the fill in such manner so that they do not cause excessive gouging.

(7) The Contractor shall be solely responsible for any damage caused by him to any dunes, lawns, fencing, boardwalk, pavement, curbs, signs, lamps, bulkhead, seawall, groin, beach grass, or any other property adjacent to the beach fill areas, and shall be required to repair at his own expense any such damage caused during the performance of work under this contract.

Prior to the commencement of operations and after completion thereof, a joint inspection by representatives of the Contractor, The Contracting Officer and/or Contracting Officer Representative and local interests pertaining to the above will be made.

SECTION 31 24 00.00 18 Page 12

(8) In order to provide access for pedestrians across the pipeline in beach use areas within the contract limits, the pipeline shall be ramped with sand over the top elevation of the pipe at pedestrian access ways or at 500-foot intervals. Width of the ramps shall be 10 feet. The Contractor may provide another method of maintaining pedestrian thoroughfare across the pipe-line upon approval by the Contracting Officer or Contracting Officer Representative. Pedestrian thoroughfare shall be maintained for the duration of the contract. Also, in order to provide for the safety of persons using the beach, the following authority shall be contacted by the Contractor to restrict appropriate beach areas: Suffolk County, Town of Babylon.

During all pumping operations, the Contractor shall provide personnel to maintain visual control at the end of the discharge line. Radio contact shall also be provided by the Contractor to enable such personnel to halt dredging in case of emergency.

(9) A diffuser must be used when discharging material onto the placement area.

(10) The area where filling operations are in progress shall be floodlighted during the hours of darkness. Illumination shall be provided by using portable light equipment such as model No.LDA I6 MTVE manufactured by ALLMAND BROS. INC. of HOLDREIRE, or approved equal. A minimum of 3-foot candles of illumination shall be maintained in the immediate vicinity of the pipe discharge.

(11) Monitoring the discharge operation by radio communication from the discharge location to the leverman during all pumping operations is required.

(12) A placement section will not be accepted for final survey unless the section is graded and dressed so as to eliminate any undrained pockets, abrupt lumps, and depressions in the beach fill surface.

(13) During all pumping operations, the Contractor shall provide personnel to maintain visual control of the end of the discharge line.

Radio contact shall also be provided by the Contractor to enable such personnel to halt dredging in case of emergencies or undesirable material placement as directed by the COE.

(14) A temporary dike shall be constructed at the inshore limit of the fill to prevent the dredging effluent from extending beyond the contract limits.

(15) Completed work on the beach fill placement will be accepted in 500-foot long sections. Upon completion of all filling operations within an acceptance section, the fill shall be graded and dressed so as to eliminate any un-drained pockets, abrupt lumps, and depressions in the beach fill surfaces. The bank caused by ocean wave erosion shall be graded down to a slope not steeper than one (1) foot vertical to twenty (20) feet horizontal to Ele. +8.5 NAVD88. Final surveys as required in paragraph entitled QUANTITY SURVEYS of the Special Contract Requirements may not be performed until fill is graded and dressed. Final acceptance of the beach fill work will be as defined in paragraph entitled FINAL EXAMINATION AND ACCEPTANCE of the Special Contract Requirements.

(16) Vehicles used in the placement operation shall be operated in such a manner as to minimize vibrations and other noise.

(17) The discharge pipeline shall not impact upon the Suffolk County's

SECTION 31 24 00.00 18 Page 13 sewer outfall pipeline. Alignment of the pipeline must be approved by the Contracting Officer. Suffolk County's sewer outfall pipeline is located at the following coordinates:

Starter N 170,478.56 E 1,165,035.49 Fuser N 155,696.67 E 1,163,924.48 End N 152,994.33 E 1,161,731.82

3.2.9 Removal and Placement of Material

Removal and Placement of Material: The unit price per cubic yard for dredging shall include the cost of removal and placement of all materials as specified herein or indicated on the drawings, with the exception of ledge rock, large boulders, large rock fragments, wrecks, snags, stumps, and piles which cannot be removed or buried below project depth without blasting. 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 Contract Clause entitled: "DIFFERING SITE

CONDITIONS" (FAR 52.236 2).

3.3 PLANT

The Contractor agrees to keep on the job sufficient plant to meet the requirements of the work. The plant shall be in a satisfactory operating condition and capable of safely and efficiently performing the work as set forth in the specifications. The plant shall be subject to the inspection of the Contracting Officer and/or Contracting Officer Representative at all times. No reduction in the capacity of the plant employed on the work shall be made except by written permission of the Contracting Officer and/or Contracting Officer Representative. The measure of the "capacity of the plant" shall be its actual performance on the work to which these specifications apply.

3.3.1 Scows

All scows must be kept in good condition, the coamings repaired and the pockets provided with proper doors or appliances to prevent leakage of material.

3.3.2 Hydraulic Pipelines

All pipelines for hydraulic dredging Plant must be kept in good condition at all times and any leaks or breaks along their length shall be promptly repaired. All breaks in any pipeline shall be reported on the Contractor's Daily Quality Control Report for the date the break occurred. An estimation of the duration of the break and the quantity of misplaced material shall be provided in the report.

3.3.3 Marking of Floating Dredge Pipelines

The contractor shall be required to mark floating dredge pipelines in accordance with the requirements of 88.15 of Annex V of U.S. Navigation Rules, inland, COMDTINST M 16672.2A, dated 23 December 1983. Dredge pipelines that are floating or supported on trestles shall display one row of yellow lights, visible all around the horizon for at least 2 miles on a clear, dark night. The lights shall flash at 50 or 70 times per minute and be places not less than 1 and not more than 3-5 meters (9.8 - 16 feet) above the water. The lights shall be sufficient in number to clearly show the length and course of the pipeline.

3.3.4 Dredge Pipelines Crossing Navigable Channels

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The arrangement of any pipeline crossing a navigable channel shall be approved by the Contracting Officer. Where the pipeline crosses a navigable channel the spacing of the lights shall not be more than 10 meters (33 feet) apart. Two red lights, visible all around the horizon for at least 2 miles on a clear, dark night, shall be displayed at each end of the pipeline, including the ends in a channel where the pipeline is separated to allow vessels to pass (whether open or closed). The lights shall be one meter (3.3 feet) apart in a vertical line with the lower light at the same height above the water as the flashing yellow light.

3.3.5 Submerged Pipelines

Any discharge pipeline submerged to cross a navigation channel shall be submerged so that sufficient depth for navigation exists. Such discharge pipeline shall be marked by signs, lights or other devices to insure safety to navigation by day and by night. All of these devices shall be in complete accordance with Coast Guard regulations.

3.3.6 Road Crossings

A detailed plan of the pipeline route to be used by the Contractor shall be submitted prior to laying of the pipeline. A ramp over any discharge pipeline crossing any roadways at the project site(s) shall be provided.

Additionally, adequate signs (caution and stop, if necessary), and flashing warning lights, shall be provided by the contractor to ensure safety to vehicles and their occupants using the roadway. Under no circumstances shall any portion of the paved portion of any roadway be disturbed. If the roadway is disturbed, the Contractor shall provide an adequate base to allow traffic to pass over the pipeline, and repairs to the roadway after completion of the project area, such that the roadway is restored to a condition equal to or better than the condition prior to disturbance. In addition, prior to placement of the pipeline across any roadway, the Contractor shall contact personnel at the appropriate municipality to determine if the warning signs and lights are adequate for safety purposes.

3.3.7 Towing Vessels

A sufficient number of vessels of adequate size and horsepower, each designed, outfitted, and equipped for towing service, shall be available at all times to move both self- and non-self propelled plant against tides, current, and winds during severe weather conditions.

3.4 DREDGE LOCATION CONTROL

The Contractor is required to have electronic positioning equipment that will accurately compute and plot the position of the dredge. Whenever dredging operations are underway, the location of the dredge shall be continuously monitored and the dredge location, in Long Island Lambert Coordinates, shall be recorded at intervals not to exceed one (1) minute.

Such records, and an accurate map showing actual dredging locations, shall be furnished to the Contracting Officer, or Contracting Officer Representative daily as part of the Quality Control Reports. The electronic positioning equipment shall be installed on the dredge so as to monitor, as closely as possible, the actual location of the cutterhead or dragarm. This equipment shall be continuously accessible by the Government representative on board the dredge, who must be able to verify equipment calibration at any time. The electronic positioning equipment shall be required to be calibrated monthly, maintained and operated so that the maximum error for the coordinates recorded do not exceed 3 feet. The location on the dredge of the master antenna and the distance and direction from the master antenna to the cutterhead shall be reported on the Quality Control Reports.

SECTION 31 24 00.00 18 Page 15

No dredging will take place outside the borrow area limits as shown on the drawings. Dredging outside of the borrow area limits will result in immediate shutdown of work. The Contractor's methods of location of the dredge shall be submitted with the quality control plan. Information to be submitted shall include a written description of the equipment, including applicable manufacturers brochure and data, and previous jobs on which the equipment has been used.

3.4.1 Dredging Depth Monitoring Equipment

The Contractor shall have in continuous operation whenever dredging operations are underway, electronic equipment which measures the cutterhead depth. The depth measuring device (as approved by the Contracting Officer or Contracting Officer Representative) shall be used and interfaced with the electronic positioning equipment required in Paragraph 3.4 of this section. The depth measuring device shall be calibrated by a bar check daily. This equipment shall be accessible to the Government Representative onboard the dredge, who shall be able to verify calibration. Vertical accuracy shall be + or -0.1 foot. Records required for dredge location (Paragraph 12) shall also include depth corrected for tide (elevation reference to NAVD). Details of the depth measuring device shall be submitted with the quality control plan.

3.5 NOTIFICATION OF ON-SHORE BARGE OPERATION

A minimum of one hour's notice must be furnished by the Contractor to the Contracting Officer, or his representative, and concurrently to the municipal or local agency responsible for beach operations prior to a barge coming on shore between the hours of 9 AM and 7 PM. Barges will not be allowed to come on shore on weekends or State holidays between the hours 9 AM and 7 PM. At no time will a barge be allowed to come on shore in an area other than the immediate work area.

3.6 BUOY REMOVAL

The Contractor shall notify the Coast Guard at least 30 days prior to the date desired for having buoys removed or relocated which interfere with dredging operations. Requests shall be made in writing to:

COMMANDER (OAN)

FIRST COAST GUARD DISTRICT

408 ATLANTIC AVENUE

BOSTON, MASS. 02110

or by telephoning (617) 223 8337

3.7 TEMPORARY FENCES

3.7.1 Land Booster Pumps

If land booster pumps are allowed to be used, a temporary protective stock mesh wire fence shall be installed by the Contractor around the booster facility. This fence shall have either wood or steel posts of adequate size installed to the acceptance of the contracting office, and/or contracting Officer's representative, and the wire mesh shall conform to federal specification rr-f221 & int. Am-1, table ix, type ii, style 8, chicken fencing 6'-0" high, 4"x6" mesh, 14 ½ gage wire, design 2672-6 or approved substitute. The fence shall be removed by the Contractor at the completion of the work or when directed by the Contracting Officer and/or Contracting Officer's Representative and all material used shall remain property of the contractor.

SECTION 31 24 00.00 18 Page 16

3.7.2 Beach Access Ramps

Beach access ramps and stairs to the work areas will be closed by the contractor by erection of a wire mesh snow fence. These features will be identified during the on-site pre-construction meeting between the Corps of Engineers, the contractor and local interests.

3.7.3 Sand Fence

The contractor may be required, at the request of the Contracting Officer, to install sand fence on the beach enclosing the designated work section.

The fence shall be installed along the backshore to prevent entry to the work area. The fencing material for this purpose shall be a wood/sand fence with a minimum height of four (4) feet fastened to eight (8) foot long cedar posts on maximum ten (10) foot centers. Orange (plastic) safety fence is not acceptable.

3.7.4 Removal of Temporary Fencing

Upon completion of work in each work area the temporary fencing shall be removed as specified in paragraph 3.7.

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