AMEND_6_Specs.pdf

Goethals Bridge Replacement Wetland Mitigation,Old Place Creek,NY GBOPC

SECTION 01 11 00

SUMMARY OF WORK

PART 1 GENERAL

1.1 WORK COVERED BY CONTRACT DOCUMENTS

1.1.1 Project Description

The Goethals Bridge Replacement Wetland Mitigation project involves the restoration of 10.05 acres of low marsh, 2.5 acres of high marsh, 7.9 acres of scrub-shrub. Project work generally involves installation of erosion and sediment control measures, clearing, grubbing, excavation, disposal, grading, fill placement, planting with native salt marsh vegetation and maintenance and monitoring upon completion of construction and related incidental work. Complexities include tidal creek crossings, tidal marsh restoration, unconsolidated substrates, highly organic soils, invasive plants and herbivory predator issues.

Erosion and sediment control measures shall be installed at the limits of work and within Old Place Creek prior to beginning clearing, grubbing or earthwork. The 28.5 acre work area shall be cleared of all standing vegetation, except in those protected areas identified on the grading plan. Protected areas will, however, be cleared of invasive vegetation such as phragmites australis (common reed). After vegetation is cleared, the site will be grubbed to loosen the ground surface.

All excavated material, whether designated for onsite reuse or offsite disposal, shall be stockpiled and dewatered onsite. Excavated material designated for offsite disposal ("non-hazardous material with regulatory exceedances") shall be transported to an approved disposal facility after dewatering. Upon completion of excavation, finish grades shall be achieved across the site and temporary stabilization measures installed.

Approved clean fill shall be furnished, placed and graded. An as-built topographic survey will be provided to the District for review prior to planting. This survey can be completed sequentially as areas within the site reach the finish grade, if approved by the COR. Specified wetland and upland plant material shall be installed within designated planting periods. The guarantee/maintenance period shall run for a minimum of two years starting from the completion of construction AND shall encompass two full growing seasons. The guarantee/maintenance period shall end on October 15 following the second growing season. The Contractor shall be responsible for any watering or material replacement during this time period.

The completion of construction shall be defined by the final acceptance by the COR of all grading, planting and herbivory fence installation

1.1.2 Location

The 49.84 acre project parcel is located along Old Place Creek, Richmond County, Staten Island, NY. The project area is bounded by Gulf Avenue along the east side, Old Place Creek along the north side, and a tributary

SECTION 01 11 00 Page 1 of Old Place Creek along the west and by a disturbed marshlands to the south.

1.2 DEFINITIONS

1.2.1 Contracting Officer

Throughout the plans and specifications, the term "Contracting Officer" includes the Government's Contracting Officer and any person he designates as his representative or alternate (also known as Contracting Officer Representative (COR)).

1.3 EXISTING WORK

In addition to "FAR 52.236-9, Protection of Existing Vegetation, Structures, Equipment, Utilities, and Improvements":

a. Remove or alter existing work in such a manner as to prevent injury or damage to any portions of the existing work which remain.

b. Repair or replace portions of existing work which have been altered during construction operations to match existing or adjoining work, as approved by the Contracting Officer. At the completion of operations, existing work shall be in a condition equal to or better than that which existed before new work started.

1.3.2 Any construction irregularity performed by the Contractor during the progress of the works shall be repaired and/or made to conform to the contract documents as stipulated in the Special Contract Requirements and Contract Clauses, shall be performed to the satisfaction of the Contracting Officer Representative and completed at no additional cost to the Government.

1.4 LOCATION OF UNDERGROUND UTILITIES

It is the Contractor's responsibility to detect, mark, and protect existing utilities (to remain) from damage during construction, as well as coordinate disconnection of utility services as necessary. Hand digging of test pits is required to locate actual utility locations. Between 2 and 10 working days prior to start of construction, not including the day of the call, weekends, or holidays the Contractor is required to notify: "Call Before You Dig - New York" (1-800-962-7962, www.digsafelynewyork.com)

Movement of construction machinery and equipment over pipes, valve boxes, and utilities to remain during construction shall be at the Contractor's risk. If a utility is inadvertently damaged, it shall be the Contractor's responsibility to restore that utility to operating condition, equal to that existing prior to damage. The Contractor shall remain at the site with the damaged utility until it has been restored and there is no danger to the public (i.e. exposed live electrical wires, etc.). Should the Contractor need to cut off utilities or services during the performance of the work, the County Department, City Department or Utility Company owning or controlling services shall be notified and requested to cut off these services. Any services cut off or interrupted by the Contractor's operations shall be restored at the Contractor's expense.

Any work adjacent to non-Government utilities shall be performed as indicated in accordance with procedures outlined by utility company.

SECTION 01 11 00 Page 2

Excavation made with power-driven equipment is not permitted within 2 feet of known Government-owned utilities or subsurface construction.

For work immediately adjacent to or for excavations exposing a utility or other buried obstruction, excavation shall be done by hand. Hand excavation shall be started on each side of the indicated obstruction and continue until the obstruction is uncovered or until clearance for the new grade is assured. Uncovered lines or other existing work affected by the Contract excavation shall be supported until approval for backfill is granted by the Contracting Officer. Damage to utility lines or subsurface construction shall be reported immediately to the Contracting Officer.

The Contractor shall remove only the existing utilities indicated on the plans. When utility lines are detected and/or encountered that are not indicated on the drawings, the Contracting Officer shall be notified prior to further work in that area.

1.5 UTILITY PROTECTION PLAN

Prior to commencement of construction, the Contractor shall submit a Utility Protection Plan detailing the methods for protection of all utilities, pipes, and valve boxes at the project site, as described in Section 01 57 20.00 10 ENVIRONMENTAL PROTECTION.

1.6 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 00.00 18 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Utility Protection Plan ; G, RO .

PART 2 PRODUCTS

Not Used.

PART 3 EXECUTION

NOT USED.

-- End of Section --

SECTION 01 11 00 Page 3

SECTION 02 23 10

CLEARING AND GRUBBING EXISTING VEGETATION AND DEBRIS

PART 1 GENERAL

1.1 SCOPE OF WORK

Under this section, the Contractor shall apply an aquatic herbicide to all areas of common reed (Phragmites australis) and shall perform clearing and grubbing operations, in accordance with the Contract Documents and as directed by the Contracting Officer. The Contractor shall also obtain all necessary permits required for the herbicide application.

No earlier than 45 days after the herbicide application, the Contractor shall clear and remove: 1) all objectionable material including trees, shrubs, brush, vines, standing Phragmites and wrack, stumps of all sizes, weeds, stones, boulders, tires and trash and 2) the top 6 inches (at a minimum) of loose surface litter and organic litter, including invasive Phragmites rhizomes, and other organic debris. This material shall be removed from within the Limits of Clearing and Grubbing in accordance with the Contract Documents, and under the direction of the Contracting Officer.

This material must be properly disposed of at an offsite location approved by the COR. At no time shall the Contractor dispose of, onsite, any debris, soil or other material that may or does contain Phragmites australis rhizomes.

The Contractor shall carefully protect all areas designated as "Protected Areas" on the plan sheets, and shall be liable for any and all damages to these protected areas resulting from the work under this Contract. Any damages to property or to protected areas shall be restored to their original conditions to the satisfaction of the Contracting Officer at the Contractor's expense.

Clearing and grubbing activities shall be completed prior to any excavation or grading activities.

In areas where soil borings have indicated the presence of non-hazardous material with regulatory exceedances at the existing ground surface, as indicated in the Contract Documents, the contractor shall remove and dispose of the material according to the specifications described below and in accordance with Section 02 22 70 OFFSITE DISPOSAL OF NON-HAZARDOUS MATERIAL

WITH REGULATORY EXCEEDANCES.

1.2 MEASUREMENT AND PAYMENT

1.2.1 Payment Item No.0004AA Site Clearing and Grubbing

1.2.1 Payment Item No.0004AA Site Clearing, Stripping and Grubbing The unit of measurement for Site Clearing, Stripping and Grubbing shall be the number of ACRES under Payment Item No.0004AA and shall include the cost of all labor, materials and equipment necessary for removing all loose surface litter, debris and material within the work limit area, and all work incidental thereto, in accordance with the plans and specifications, to the satisfaction of the Contracting Officer.

SECTION 02 23 10 Page 1

The per acre price bid shall include the cost of all labor, materials, equipment, hauling, and disposal necessary for the Clearing, Stripping and Grubbing of the areas indicated for clearing and grubbing on the project plans. Stripping and Grubbing shall be to a minimum depth of 9 inches. The per acre price bid shall include the disposal of this material at an approved offsite upland compost facility or waste facility.

1.2.2 Payment Item No.0004AB (Base Bid) and Optional Payment Items No. 0012 through 0014 - SITE Clearing and Grubbing at areas with non-hazardous material with regulatory exceedances.

The unit of measurement for Site Clearing and Grubbing at areas with non-hazardous material with regulatory exceedances shall be the number of ACRES under Payment Item # No.0004AB (Base Bid, and optional payment items No. 0012 through 0014, and shall include the cost of all labor, materials and equipment necessary for removing all loose surface litter, debris and material within the indicated area, and all work incidental thereto, in accordance with the Contract Documents, to the satisfaction of the Contracting Officer.

The per acre price bid shall also include the cost of all labor, materials, equipment, hauling, and disposal necessary for the clearing, stripping and grubbing of the areas indicated in the contract drawings.

The per acre price bid shall include the disposal of this material at an approved offsite upland waste facility. The Contractor is responsible for all testing associated with determining appropriate disposal.

Clearing, Stripping and Grubbing Existing Vegetation and Debris at areas with non-hazardous material with regulatory exceedances Soil borings B4, B6, B7, B10, E1, E3, E5) shall be done for a 25 foot radius centered on the soil boring locations where testing has indicated the presence of non-hazardous material with regulatory exceedances, as indicated in the contracted drawings. Stripping and Grubbing within this 25 foot radius shall be to a minimum depth of 18 inches.

The Contractor shall dispose of all material removed under Payment Item No.0004AB (Base Bid) and Optional Payment Items No. 0012 through 0014 according to the specifications described below and in accordance with Section 02 22 70 OFFSITE DISPOSAL OF NON-HAZARDOUS MATERIAL WITH REGULATORY

EXCEEDANCES.

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

SD-01 Pre-Construction Submittals Tree Protection Plan, G, PB

SD-03 Product Data Tree wound paint, G, A, PB Submit product information 30 days prior to starting work.

SECTION 02 23 10 Page 2

Herbicide, G, A, PB.

Submit product information 30 days prior to starting work.

PART 2 PRODUCTS

2.1 TREE WOUND PAINT

Bituminous based paint of standard manufacture specially formulated for tree wounds.

2.2 HERBICIDE

RODEO herbicide manufactured by Monsanto Industries, or an approved equal shall be the herbicide used to eradicate unwanted and/or invasive plant species in and around the Planned Wetland Area.

PART 3 EXECUTION

3.1 DELIVERY, STORAGE, AND HANDLING

Materials shall be delivered in the original, unopened containers bearing the manufacturer's chemical analysis, and store at the site in accordance with the manufacturer's instructions and the New York State Department of Environmental Conservation (NYSDEC) regulations.

3.2 METHOD

The Contractor shall perform work as indicated under this section prior to beginning work on excavation covered under other sections as directed by the Contracting Officer.

3.2.1 Permits

The Contractor shall be responsible for preparing, submitting, and obtaining any permits form federal, state, borough or local agencies that are required to authorize the spraying of herbicide. Copies of the permits shall be available for review by the Contracting Officer upon request prior to the application of any herbicide.

3.2.2 Invasives Eradication

The Contractor shall apply herbicide at a rate in accordance with the manufacturer's instructions and the NYSDEC regulations. The Contractor shall apply herbicide via backpack, spraying at least 45 days prior to beginning clearing/grubbing or excavation. Post construction, herbicide shall not be applied by backpack spraying or any other means (other than the primary pre-construction application), which, in the opinion of the Project Biologist or Contracting Officer, will result in the destruction of either existing native or planted wetland vegetation.

The Contractor shall be responsible, as necessary, for bi-annual herbicide application, during the contract warrantee period. The initial application of RODEO shall be applied between August and early October, when the product is most effective at killing rhizomes. The Project Biologist shall inspect

SECTION 02 23 10 Page 3 the planned wetland, post construction, for the reestablishment/presence of invasive species of vegetation (i.e. Phragmites australis, Polygonum cuspidatum, Wisteria frutescens, Ailanthus altissima, Celastris orbiculatus, Ampelopis brevipendunculata, Rosa multiflora and Artemesia vulgaris). Post construction, Rodeo shall be applied by hand painting, backpack sprayer or other controlled means under the direction of the Project Biologist in such a manner as to prevent collateral damage to existing native or planted vegetation.

The surfactant used in conjunction with the application of RODEO shall be exempt from the requirements of tolerance under Title 40, CFR, 180.1001(d).

Examples of such surfactants include LI 700 (Loveland Industries, Inc.) and Cygnet Plus (Brewer International).

3.3 CLEARING

Clearing shall consist of the felling, trimming, and cutting of trees into sections and the satisfactory disposal of the trees and other vegetation designated for removal, including downed timber, snags, brush, and rubbish occurring within the areas to be cleared. [Clearing shall also include the removal and disposal of non-vegetative debris and structures that obtrude, encroach upon, or otherwise obstruct the work.] Trees, stumps, roots, brush, and other vegetation in areas to be cleared shall be cut off flush with or below the original ground surface, except such trees and vegetation as may be indicated or directed to be left standing. Trees designated to be left standing as determined by the project biologist within the cleared areas shall be trimmed of dead branches 1-1/2 inches or more in diameter. In addition any such trees shall be protected from damage potentially caused by construction activities.

Every effort shall be made to avoid excessive damage to the roots of trees to be left standing. Limbs and branches to be trimmed shall be neatly cut close to the trunk of the tree or main branches. Cuts more than 1-1/2 inches in diameter shall be painted with an approved tree-wound paint. Apply herbicide in accordance with the manufacturer's label to the top surface of stumps designated not to be removed.

3.4 TREE REMOVAL

3.4.1 Tree Protection Plan

The Contractor shall submit a tree protection plan 30 days prior to the start of work for Clearing and Grubbing. The purpose of the tree protection plan is to identify trees within the project site that are of a desirable species that should be protected during construction rather than be removed.

(The tree protection plan should not include those trees that are located within the "Protected Areas" shown on the plans, as they are already to be protected.) The Contractor shall identify trees of a desirable species, as determined by the Project Biologist. At a minimum, the Tree Protection Plan should show the location and species of those trees to be protected; it should discuss the measures that will be taken to protect the selected trees, including measures to be taken if a protected tree is damaged during construction activities.

Existing invasive vegetation (phragmites australis) is very dense and it may not be possible to identify all desirable trees within the project area after the application of the herbicide and prior to clearing and grubbing.

However, it is the responsibility of the Contractor to identify any possible desirable trees prior to clearing and grubbing a specific sector of the project area. The Tree Protection Plan should be updated to reflect each

SECTION 02 23 10 Page 4 addition of desirable species as it is determined, and prior to the clearing and grubbing of the sector of the project area in which it are located.

3.4.2 Vegetation Removal Outside of the Clearing and Grubbing Limits

Where indicated on the drawings or directed by the Project Biologist, trees and stumps shall be removed from areas outside those areas designated for Limits of Clearing and Grubbing. This work shall include the felling of such trees and the removal of their stumps and roots as specified in paragraph GRUBBING. Trees shall be disposed of as specified in paragraph DISPOSAL OF

MATERIALS.

4.1 PRUNING

The Contractor shall trim trees designated to be left standing within the cleared areas of dead branches 1 1/2 inches or more in diameter. Neatly cut limbs and branches to be trimmed close to the trunk of the tree or main branches. Paint cuts more than 1 1/2 inches in diameter with an approved tree wound paint.

4.2 STRIPPING AND GRUBBING

Stripping and Grubbing shall consist of the removal and disposal of the subsurface vegetative materials that remain after clearing. This remaining vegetative material includes stumps, roots larger than 3 inches in diameter, and matted roots.

Material to be stripped and grubbed, together with logs and other organic or metallic debris not suitable for as sub-grade or planting medium purposes, shall be removed to a depth of not less than 9 inches below the original surface. Depressions made by stripping and grubbing shall be filled with suitable material and compacted to make the surface conform to the original adjacent surface of the ground.

4.3 WRACK REMOVAL

All wrack (dead vegetative debris that has floated ashore) and other floatable trash and debris that has collected in the low marsh, high marsh, and maritime scrub/shrub planting areas shall be thoroughly removed and disposed of off-site. Wrack and debris removal is an ongoing effort that will continue throughout the construction and monitoring periods. The Contractor shall inspect the project area at least weekly or after a storm event, and shall collect wrack or debris for disposal during these inspections. Every effort shall be made to avoid damage to the existing or recently planted wetland vegetation adjacent to these areas. When damage does occur, it shall be repaired at the Contractor's expense and to the satisfaction of the Contracting Officer.

4.4 DISPOSAL OF MATERIALS

Logs, stumps, roots, brush, rotten wood, and other refuse from the Clearing and Grubbing operations shall be disposed of at the appropriate off-site facilities, except when otherwise directed in writing by the Contracting Officer or the Project Biologist. Such directive will state the conditions covering the disposal of such products and will also state the areas in which they may be placed.

SECTION 02 23 10 Page 5

4.5 PROTECTION

4.5.1 Roads and Walks

The Contractor shall keep roads and walks free of dirt and debris at all times.

4.5.2 Trees, Shrubs, and Existing Facilities

Trees, shrubs, and existing facilities shall be protected in accordance with Section 01 57 20.00 10 and Paragraph 4.2 of this section. Trees and vegetation to be left standing shall be protected from damage incident to clearing, grubbing, and construction operations by the erection of barriers or by such other means as the circumstances require.

4.5.3 Utility Lines

It is the responsibility of the Contractor to have all utilities within 100 feet of the project area located and marked prior to the start of any clearing, grubbing and excavation activities. The Contractor shall protect all existing utility lines from damage. The Contractor shall notify the Contracting Officer immediately of damage to or an encounter with an unknown existing utility line. The Contractor shall be responsible for the repairs of damage to existing utility that are indicated or made known to the Contractor prior to start of clearing and grubbing operations. When utility lines which are to be removed are encountered within the area of operations, the Contractor shall notify the Contracting Officer in ample time to minimize interruption of the service. Refer to Section 01 57 35.00 18, TEMPORARY CONSTRUCTION FACILITIES for additional utility protection.

SECTION 02 23 10 Page 6

SECTION 31 00 00

EARTHWORK

PART 1 GENERAL

1.1 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.

ASTM INTERNATIONAL (ASTM)

ASTM D 4972 (2001; R 2007) pH of Soils

1.2 SCOPE OF WORK

Under this section, the Contractor shall perform excavation, fill, placement, rough grading and disposal activities required for grading the site to the proposed grades. Excavated and fill materials shall be placed and compacted, where necessary, in accordance with the plans, specifications, and directions of the Contracting Officer. Material unsuitable for onsite upland placement and Non-Hazardous material with regulatory exceedances shall be disposed of at an approved offsite upland disposal facility and in accordance with SECTION 02 22 70 OFFISTE DISPOSAL

OF NON-HAZARDOUS MATERIAL WITH REGULATORY EXCEEDANCES

After final grading is complete, access to graded areas shall be only on foot. Only hand tools will be used on the site after final grading has occurred.

The Contractor shall carefully protect all "Preserved Areas" as shown on the plans, and shall also be liable for any and all damages to property caused by the Contractor's operations. Any damages to property or to vegetation within the protected areas shall be restored to the original conditions and comply with Contract Documents.

It is assumed that the Contractor will encounter a small volume of material unsuitable for onsite upland placement. Furthermore, environmental sampling and testing indicated the presence of non-hazardous material with regulatory exceedances at certain locations. The Contractor shall excavate every type of material encountered within the limits of the project. Off-site disposal of material unsuitable for on-site upland placement and non-hazardous material with regulatory exceedances shall be delivered off-site with disposal executed according to specifications for non-hazardous material with regulatory exceedance in specification SECTION 02 22 70 OFFSITE

DISPOSAL OF NON-HAZARDOUS MATERIAL WITH REGULATORY EXCEEDANCES.

Environmental soil sampling and testing indicated the presence of non-hazardous material with regulatory exceedances within the depths to be excavated, or at the ground surface, at the following sampling locations:

B4, B6, B7, B10, E1, E3, E5 (and see contract drawings).For those areas where soil borings indicate the presence of non-hazardous materials with

SECTION 31 00 00 Page 1 regulatory exceedance within the depths to be excavated, or at the ground surface, all excavated material within a 25 foot radius of these specified soil borings shall be disposed at an approved offsite upland disposal facility. Excavation within this 25 foot radius shall be done to a depth of 3 foot below ground surface. This excavation depth shall not include the 18 inches of stripping and grubbing depth previously executed during the clearing and grubbing, as specified in SECTION 02 23 10 CLEARING AND GRUBBING EXISTING VEGETATION AND DEBRIS. Excavation shall be done to a depth of 5ft below ground surface, not including the 18 inches of previously stripped and grubbed material, for all material within a 25 foot radius. The Contractor is responsible for all testing associated with determining appropriate disposal.

The per cubic yard price bid for Off-site Disposal of Excavated Material Unsuitable for On-site Upland Placement (Payment Item 0006AB and Optional Payment items 00015 through 0018) and for Off-site Disposal of non-hazardous material with regulatory exceedance, (Payment Item 0006AC and Optional Payment items 0019 through 0022) shall be the additional cost per cubic yard for disposal of each respective material at the off-site disposal facility.

1.2.1 Cut/Fill Determination

The cut, fill and clean fill quantities on the project site were determined by using the MicroStation Bentley InRoads software. A 3-Dimensional surface model was created for both the existing and proposed conditions. The existing conditions model was based on a topographic survey performed by Rogers Surveying of Staten Island, NY, dated 6/18/14. The design (proposed conditions) model was based on vegetation and tide cycle data that were collected at the project site. These two surface models were compared, enabling the determination of the cut, fill and clean fill quantities.

The net quantity of cut and fill materials does NOT include the volume of material associated with the clearing, stripping and grubbing of the project site. See Section 02 23 10, CLEARING AND GRUBBING EXISTING VEGETATION AND

DEBRIS.

The marsh restoration area will be regraded to an elevation six (6) inches below the final design elevations, at which point the marsh restoration area will be capped with a 6 inch layer of clean sand to meet the final design elevations for proper plant growth.

1.3 MEASUREMENT

1.3.1 Unclassified Excavation

The unit of measurement for Payment Item 0006AA for Unclassified Excavation will be the cubic yard, computed by the surface to surface method from cross sections taken before and after the excavation operations, including the excavation for ditches, gutters, and channel changes, when the material is acceptably utilized as herein specified. The measurements will include authorized excavation of unsatisfactory subgrade soil and the volume of loose, scattered rocks and boulders collected within the limits of the work.

The measurements will include authorized excavation of Non-Hazardous Material with Regulatory Exceedance. The measurement will NOT include the volume of subgrade material or other material that is scarified or plowed and reused in-place, and will not include the volume excavated without authorization or the volume of any material used for purposes other than

SECTION 31 00 00 Page 2 directed. The measurement will not include the volume of any excavation performed prior to the taking of elevations and will not include the volumes associated with stripping of the existing vegetation, (See Section 02 23 10, CLEARING AND GRUBBING EXISTING VEGETATION AND DEBRIS).

1.3.2 Offsite Disposal of Excavated Material Unsuitable for Onsite Upland Placement

The unit of measurement for Payment Item # 0006AB and Optional Payment Item #'s 0015 through 0018, DISPOSAL OF MATERIAL UNSUITABLE FOR PLACEMENT, will be the cubic yard of material unsuitable for onsite upland placement disposed of at an approved offsite upland facility. The measurement will include, but is not limited to construction and demolition debris, bricks, concrete, and metal scraps.

1.3.3 Offsite Disposal of Non-Hazardous Material with Regulatory Exceedances

The unit of measurement for Optional Payment Item # 0006AC and Optional Payment Item #'s 0019 through 0022, DISPOSAL OF NON-HAZARDOUS MATERIAL WITH REGULATORY EXCEEDANCES, will be the cubic yard of Non-Hazardous Material with Regulatory Exceedances computed by the surface to surface method from cross sections taken before and after the excavation operations within the 25 ft radius of the indicated soil borings and disposed of at an approved offsite upland facility. The Contractor is responsible for all testing associated with determining appropriate disposal

1.3.4 Clean Sand Imported

The unit of measurement for Payment Item 0006AD CLEAN SAND, IMPORTED (MEASURED IN PLACE) shall be measured by the CUBIC YARD in place, and will be placed in a 6-inch layer over the entire project area to meet the final design grade elevations in the areas of low marsh,low marsh/high marsh transition, high marsh, scrub-shrub and upland. The clean sand will serve as a suitable top layer for the newly-planted vegetation to take root. Clean sand shall be placed up to the tops-of-bank of the newly created channels, but not along the interior side slopes or channel bottoms. As such, it will be necessary to bring the channel bottoms and interior side slopes to final grade using excavated and/or re-graded material from onsite.

1.4 PAYMENT

1.4.1 Payment Item # 0006AA - UNCLASSIFIED EXCAVATION AND ON-SITE PLACEMENT

This item shall be paid for at the Contract unit price per cubic yard for unclassified excavation. The unit price shall include all labor and equipment necessary for rough grading, excavation, and placement of excavated material, including onsite hauling, individual timber mats, any necessary pumping, diversions, sheeting, and/or bracing, and any other incidental work and expenses necessary to complete the work under this item in accordance with the plans and specifications and to the satisfaction of the Contracting Officer.

Re-handling of excavated materials designated for offsite disposal by the Contracting Officer shall be paid for under 0006AB (Base Bid) and Optional Payment Items# 0015 through 0018 and Payment Item #0006AC (Base Bid) and Optional Payment Item# 0019 through 0022 (DISPOSAL OF NON-HAZARDOUS MATERIAL

SECTION 31 00 00 Page 3

WITH REGULATORY EXCEEDANCES.) Re-handling of excavated materials may be paid for as excavation when the same is made necessary by changes of plans and is ordered in writing by the Contracting Officer. Additional payment shall not be made for minor field changes to the grading design in order to accomplish adequate site slope or drainage.

1.4.2 Payment Item # 0006AB (Base Bid) and Optional Payment Item# 0015 through 0018-OFFSITE DISPOSAL OF EXCAVATED MATERIAL UNSUITABLE FOR ONSITE

UPLAND PLACEMENT

The per cubic yard price bid for Offsite Disposal of Excavated Material Unsuitable for Onsite Upland Placement shall be the difference in cost per cubic yard for the offsite disposal of Excavated Material Unsuitable for Onsite Upland Placement relative to the per cubic yard base price for unclassified excavation and placement (Payment Item# 0006AA). The unit price shall include ONLY the added cost of all labor, materials, equipment, documentation, hauling and incidental expenses necessary for proper disposal of Excavated Material Unsuitable for Onsite Upland Placement, at an approved offsite upland disposal facility. The cost for the excavation of this material is covered under payment item 0006AA and no additional payment shall be made for excavation.

1.4.3 Payment Item #0006AC (Base Bid) and Optional Payment Item# 0019 through 0022-OFFSITE DISPOSAL OF EXCAVATED NON-HAZARDOUS MATERIAL WITH

REGULATORY EXCEEDANCES.

The per cubic yard price bid for Offsite Disposal of Excavated Non-Hazardous Material with Regulatory Exceedances shall be the difference in cost per cubic yard for the disposal of Excavated Non-Hazardous Material with Regulatory Exceedances relative to the per cubic yard base price for unclassified excavation (Payment Item 0006AA). The unit price shall include ONLY the added cost of all labor, materials, equipment, documentation, hauling and incidental expenses necessary for proper disposal of Excavated Material Unsuitable for Onsite Upland Placement, at an approved offsite upland disposal facility. The cost for the excavation of this material is covered under payment item 0006AA and no additional payment shall be made for excavation.

1.4.4 Payment Item No. 0006AD -CLEAN SAND, IMPORTED (MEASURED IN PLACE)

Clean sand imported from off-site shall be paid for by the contract unit price per CUBIC YARD in place, and will be placed in a 6-inch layer over the entire project area to meet the final design grade elevations in the areas of low marsh, high marsh, scrub-shrub and upland. The unit price shall include all labor, equipment, tools, supplies and incidentals necessary to complete the work under this item. (See Section 31 00 10 CLEAN SAND, IMPORTED) (MEASURED IN PLACE))

1.5 SUBSURFACE DATA

Subsurface soil boring logs are shown in the plans and specifications. These data represent the best subsurface information available; however, variations may exist in the subsurface between boring locations.

PART 2 PRODUCTS

2.1 MATERIAL REQUIREMENTS

SECTION 31 00 00 Page 4

2.1.1 Satisfactory Materials for CLEAN SAND, IMPORTED (MEASURED IN PLACE)

Satisfactory materials for clean sand imported from offsite shall meet the following requirements:

a. Materials classified under Section 31 00 10 - CLEAN SAND, IMPORTED

(MEASURED IN PLACE)

b. Materials with a combined silt and clay content of less than 10 percent.

PART 3 EXECUTION

Excavation or any other construction activities shall not commence until all soil erosion and sediment control features have been installed.

Any vegetation within preserved areas damaged by the work under this section, as determined by the Contracting Officer, shall be replaced immediately after the completion of the work at no additional cost to the Government.

3.1 UTILITIES

Prior to commencement of construction, the Contractor shall locate utilities as described in Section 01 11 00 SUMMARY OF WORK. The NYCDOT requires that no permanent loads or fill shall be placed upon the existing sewer lines.

3.2 GENERAL EXCAVATION

The Contractor shall perform excavation of every type of material encountered within the limits of the project to the lines, grades, and elevations, minus six (6) inches, as indicated and specified on the plans.

Six inches of select sand fill shall be placed on the marsh to meet plan grade elevations.

3.2.1 Clearing and Grubbing Existing Vegetation

All Clearing and Grubbing, and stripping to a depth of 9 inches shall be done in accordance with SECTION 02 23 10 CLEARING AND GRUBBING EXISTING VEGETATION AND DEBRIS and shall be paid under Payment Items# 0004AA, 0004AB and Optional Payment Items# 0012 through 0014. No additional payment shall be made for these activities under Payment Item 0006AA, 0006AB, 0006AC, Optional Items#0015 through 0018, or Optional Items 0019 through 0022

3.2.2 Hand-Digging

It is understood that a minimal amount of hand digging of small channels may be necessary for portions of the marsh to drain successfully. All hand digging shall be approved by the Contracting Officer, upon consultation with the Project Biologist. There will be no additional payment for hand digging.

3.2.3 Ditches and Channel Changes

Excavation of ditches and channel changes shall be accomplished by cutting accurately to the cross sections, grades, and elevations shown on the plans.

Ditches shall not be excavated below grades shown. Excessive open ditch excavation shall be backfilled with satisfactory, thoroughly compacted, SECTION 31 00 00 Page 5 material to grades shown. Material excavated shall be disposed of as shown or as directed. The Contractor shall maintain excavations free from detrimental quantities of leaves, brush, sticks, trash, and other debris until final acceptance of the work.

3.3 TIMING

The Contractor shall schedule the work to coincide with advantageous low tide cycles. Excavation shall not proceed in areas that are inundated by tidal waters.

3.4 STOCKPILES

Silt Fence shall be installed around the perimeter of the stockpiles in accordance with Section 02 36 80 SILT FENCE. If excavated materials are to remain stockpiled for longer than one week, they must be stabilized in accordance with the Soil Erosion and Sediment Control Plan until the excavated materials can be removed. Excavated materials suitable for onsite placement may be stockpiled within the onsite placement area.

Stockpiles for clean fill and compost may be within the staging area, or additional stockpiling areas may be sited with approval from the Contracting Officer. Stockpiles for non-hazardous material with regulatory exceedances shall be done in accordance with SECTION 02 22 70 (OFFSITE DISPOSAL OF NON-HAZARDOUS MATERIAL WITH REGULATORY EXCEEDANCES) Clean sand, imported, shall be stockpiled separately from the excavated materials. Stockpiles of clean sand and shall be protected from contamination that may destroy the quality and fitness of the sand. If the Contractor fails to protect the clean sand stockpiles and the sand becomes unsatisfactory, the Contractor shall be liable for removing, disposing, and replacing such material with satisfactory clean material from approved sources at his own expense.

3.5 PLACEMENT AREAS

Placement Areas shall be kept in a neat and well drained condition, giving due consideration to drainage at all times. Silt Fence shall be installed around the perimeter of Placement Areas in accordance with Section 02 36 80

SILT FENCE.

3.5.1 Construction Sequencing

Construction sequencing of the excavation, stockpiling, onsite placement, and imported clean sand for the marsh restoration area, shall be the responsibility of the Contractor.

3.5.2 Placing Onsite Borrowed Fill

Onsite Borrowed Fill shall be placed to the lines and grades indicated in the plans for the onsite placement area. The material shall be constructed in successive horizontal layers not over 12 inches in depth extending across the entire area of fill. The material shall be placed and distributed so that there will be no pockets of poorly-graded material. Each layer shall be spread by a bulldozer or other acceptable grading equipment and methods, and shall be compacted by the movement of the spreading/grading equipment over the layer to the satisfaction of the Contracting Officer before a successive layer is constructed. The layers shall not be overly-compacted and shall be done in a manner to maximize the success of the marsh plantings

When placing the excavated material ("onsite borrowed fill") at the onsite

SECTION 31 00 00 Page 6 placement area, the Contractor shall reserve any silty soil and sandy soils to be placed as the top layer where possible. Soils containing small rocks and shells shall not be placed in the top 2 feet of the borrowed fill placement. Clays should not be mixed with other soil types so a barrier to infiltration does not occur.

The contractor should expect to regrade an area more than once to mitigate settlement after initial placement and grading of onsite borrowed fill.

Hollows and depressions that develop during the process of placing and compacting shall be filled with acceptable material and the grade shall again be compacted. This process of filling and compacting shall be repeated until no depressions develop. The entire work of grading and compacting shall be performed to the satisfaction of the Contracting.

The Contractor shall expect substantial settlement due to soft substrate conditions. Settlement should be mitigated though the placement of additional onsite borrowed fill so that elevations are stable and at an elevation of design grades less 6 inches prior to clean fill placement.

The Contractor shall expect substantial settlement due to soft substrate conditions. The Contractor will receive no additional compensation for such conditions as the clean sand quantities will be measured in-place after settlement. Settlement should be mitigated though the placement of additional onsite borrowed fill.

After compacting, the area shall be left in a uniformly compacted, smooth, dense, true, firm, satisfactory, and evenly finished condition, free of compaction planes, irregularities, voids, ridges or loose material.

Deficiencies resulting from improper placement or compaction shall be fully corrected by the Contractor. The correction of deficiencies shall be performed at no additional cost to the Government.

3.5.3 Placing Clean Sand

The clean sand shall be placed as the final 6-inch layer of material that will bring the restored marsh area up to its final design grade elevations, and in which the low and high marsh vegetation will be planted. All grades indicated on plan sheets are approximate and grading may require field changes with approval from the COR during construction to accommodate existing field conditions.

The clean sand layer shall be spread with appropriate equipment and methods that will ensure the greatest success of the marsh plantings. Hollows and depressions that develop during the process of placing the clean sand layer shall be filled and re-graded until the design grades are achieved and sustained. The entire work requirement of placing and grading the clean sand layer shall be performed to the satisfaction of the Contracting Officer.

See Specification Section 31 00 10 for more information and details about the clean fill to be utilized in this project.

3.6 FINISHING

The surface shall be smoothly finished in accordance with the lines, grades, SECTION 31 00 00 Page 7 and cross sections or elevations shown. The degree of finish for the marsh restoration area shall be within 0.1 foot of the grades and elevations indicated as specified by SECTION 02 23 20 SURVEYING. Channels and ditches shall be finished in a manner that will result in effective drainage.

Settlement or washing that occurs in graded areas prior to acceptance of the work, shall be repaired and grades re-established to the required elevations and slopes.

SECTION 31 00 00 Page 8

SECTION 31 00 10

CLEAN SAND, IMPORTED (MEASURED IN PLACE)

PART 1 GENERAL

1.1 SCOPE OF WORK

Under this section, the Contractor shall furnish and place documented sand fill, to bring the marsh restoration area construction portion of the site to the required lines and grades ready for planting as indicated on the contract drawings and/or as directed by the Contracting Officer

1.2 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 00.00 18 SUBMITTAL PROCEDURES:

SD-03 Product Data

Imported Sand Fill ; G, RO, DO

Submit data sheets 30 calendar days prior to starting work. The data sheets shall show that materials meet the requirements specified herein. Data sheets shall include particle size, textural class, pH, and nutrient specifications.

SD-04 Samples

Sand Bags ; G, RO

Submit two (2) five-pound bag samples of clean sand material to the Contracting Officer for approval 30 days prior to commencing fill operation.

SD-07 Certificate

A sieve or gradation analysis, results of a pH test and Notarized Certificate identifying the source of clean sand fill shall be secured to each sample submitted to the Contracting Officer for approval.

1.3 GUARANTEE

By submitting samples of the fill materials, the Contractor agrees and guarantees that the fill used for construction will conform to the samples supplied. Final acceptance of the clean sand materials rests with the Contracting Officer, whose decision shall be final and binding upon the Contractor. However, the acceptance of any material shall not relieve the Contractor of his responsibility to ensure the sand material conforms with approved samples and the specifications.

SECTION 31 00 10 Page 1

1.4 MEASUREMENT AND PAYMENT

The quantity of furnished clean sand material shall be reimbursed under Payment Item No. 0006AD and shall be measured as the number of cubic yards, measured in place in the final position by average end area or other approved method, furnished and placed in the work areas as specified. The quantity shall be calculated by a licensed, independent surveyor using previously collected survey data (See SECTION 02 23 20

SURVEYING)

The per cubic yard price bid for furnished clean sand material shall include the cost of all labor, materials, equipment, documentation, hauling, stockpiling and incidental expenses necessary to complete the work in accordance with the plans and specifications, to the satisfaction of the Contracting Officer.

The Contractor shall expect substantial settlement due to soft substrate conditions. The Contractor will receive no additional compensation for such conditions as the clean sand quantities will be measured in-place after settlement. Settlement should be mitigated though the placement of additional onsite borrowed fill prior to the placement of imported fill.

PART 2 PRODUCTS

2.1 Clean Sand

The sand material ("CLEAN SAND, IMPORTED") shall be granular coarse sand material to be placed to a depth of six(6) inches on the marsh restoration area after completion of excavation as indicated on the plans and in accordance with the specifications.

Satisfactory materials for " CLEAN SAND, IMPORTED" shall be a natural product derived from weathered rock composed of quartz and/or silica. It shall be free of sticks, sod, branches, roots, grass, weeds, toxic chemicals, oils, petroleum products, construction debris, wood and timber, glass, and other refuse.

2.1.1 Composition

Sand must conform to the following gradation:

Sieve No. Opening Size (mm) Designation % Passing 4 4.75 rock & stone 100% 40 0.42 medium sand 80% to 100% 100 0.15 fine sand 10% to 70% 200 0.075 very fine sand 0% to 35%

SECTION 31 00 10 Page 2

PART 3 EXECUTION

3.1 PLACEMENT METHOD

All clean sand material shall be placed as the top 6" layer of material, which will bring the elevations to their final design grades, as indicated in contract documents. This top 6" layer shall be spread by a bulldozer or other acceptable grading equipment and methods and shall be firmed by the movement of the spreading/grading equipment over the layer to the satisfaction of the Contracting Officer.

The area shall be left in a uniformly smooth, dense, and evenly finished condition, free of irregularities, voids, ridges or loose material.

Deficiencies resulting from improper placement or compaction shall be fully corrected by the Contractor. Due to variations in settlement rates and the soft substrate, the Contractor can expect to regrade the areas of clean sand multiple times in order to achieve the final design elevations. If additional clean sand fill is needed after settlement, it shall be added in layers not greater than 6" in depth at a time; each successive 6" layer shall be rolled by the heavy equipment before starting the next. No additional compensation shall be made for settlement and regrading.

Note that the work in the marsh restoration area is within the tide zone and the work of placing and rolling the 6" clean sand layer (and additional layers if necessary) must be accomplished during the period of low tide. No stockpiling of material within the marsh restoration area will be allowed.

3.2 COMPUTATION OF QUANTITIES OF Sand

Computation of quantities for clean sand and shall be the cross-section average-end area method, or other approved method.

3.4 APPEAL PROCESS

The Contracting Officer shall check for discoloration and evidence of unacceptable contents. If the Contracting Officer suspects that the sand possesses hazardous or contaminated characteristics, it will be rejected.

Should the Contractor contest the Contracting Officer's determination, samplings of the rejected soil will be sent to a Laboratory certified by the NYSDOH Environmental Laboratory Accreditation Program (E.L.A.P.) for the selected analytical method.

3.4.1 Environmental Analysis

Environmental analysis shall include, but not limited to, U.S.E.P.A.

Standard Test Methods for determination of Contaminant Concentrations, and the Toxicity Characteristic Leaching Procedure (T.C.L.P.) for determination of Leachability of at least 39 components.