S01 Attachment 3 Daguey Dam Repair_Specifications.pdf

AÑASCO RIVER WATERSHED

CONSTRUCTION SPECIFICATIONS AND MATERIAL SPECIFICATIONS

FOR

FLOODWATER RETARDING STRUCTURE NO. 3 (DAGÜEY

DAM) REPAIR

100% SUBMITTAL

NOVEMBER 2022

Prepared by

Texas Registered Engineering Firm

F-2144

Freese and Nichols, Inc.

4055 International Plaza, Suite 200

Fort Worth, Texas 76109

DRAFT

THIS DOCUMENT IS RELEASED FOR THE PURPOSE

OF INTERIM REVIEW UNDER THE AUTHORITY OF

MATHEW MOSES, P.E., PUERTO RICO NO. 19946

ON 11/23/2022. IT IS NOT TO BE USED FOR

CONSTRUCTION, BIDDING OR PERMIT PURPOSES.

FREESE AND NICHOLS, INC.

TEXAS REGISTERED ENGINEERING FIRM F- 2144

Dagüey Dam Repairs

Puerto Rico Department of Natural and Environmental Resources

TABLE OF CONTENTS

1.0 CONSTRUCTION SPECIFICATIONS

2.0 MATERIAL SPECIFICATIONS

Section Title Date

523 Rock for Riprap Apr-22

581 Metal Apr-22

582 Galvanizing Feb-22

591 Field Fencing Material Apr-22

592 Geotextile Apr-22

Section Title Date

2 Clearing and Grubbing May-01

3 Structure Removal May-01

5 Pollution Control Jan-14

6 Seeding, Sprigging, and Mulching Sep-18

7 Construction Surveys Jan-09

8 Mobilization and Demobilization May-01

9 Traffic Control May-01

10 Water for Construction Jan-09

11 Removal of Water May-01

21 Excavation May-01

23 Earthfill Feb-20

26 Topsoiling May-01

61 Rock Riprap Sep-18

81 Metal Fabrication and Installation May-01

92 Field Fence Jan-09

94 Contractor Quality Control Jan-09

95 Geotexile Jan-14

96 Field Office May-01

Dagüey Dam Repairs

Puerto Rico Department of Natural and Environmental Resources

1. DEFINITIONS:

Contracting Local Organization (CLO) – Puerto Rico Department of Natural and Environmental

Resources

Owners – Puerto Rico Department of Natural and Environmental Resources

Contracting Officer (CO) – Representative of Puerto Rico Department of Natural and

Environmental Resources

Government – Natural Resources Conservation Service (NRCS)

Engineer – Kenall - Freese and Nichols, Inc. Joint Venture

Government Representative (GR) – Yilia BaucageBou, NRCS Puerto Rico State Conservation

Engineer

Inspector – Construction Inspector (on-site)

Quality Assurance (QA) – Construction Inspector (on-site)

Quality Control (QC) – Contractor’s Construction Inspector (on-site)

2. LOCATION: The site is approximately half a mile northeast of the town of Añasco along route 404.

(210-VI-NEH, May 2001) 2–1

Construction Specification 2—Clearing and Grubbing

1. Scope The work consists of clearing and grubbing and disposal of trees, snags, logs, brush, stumps, shrubs, and rubbish from the designated areas.

2. Protection of existing vegetation Trees and other vegetation designated to remain undisturbed shall be protected from damage throughout the duration of the construction period. Any damages resulting from the contractor's operations or ne-glect shall be repaired by the contractor.

Earthfill, stockpiling of materials, vehicular parking, and excessive foot or vehicular traffic shall not be allowed within the drip line of vegetation designated to remain in place. Vegetation damaged by any of these or similar actions shall be replaced with viable vegetation of the same species, similar condition, and like size unless otherwise approved by the contracting officer.

Any cuts, skins, scrapes, or bruises to the bark of the vegetation shall be carefully trimmed and local nursery accepted procedures used to seal damaged bark.

Any limbs or branches 0.5 inch or larger in diameter that are broken, severed, or otherwise seriously damaged during construction shall be cut off at the base of the damaged limb or branch flush with the adjacent limb or tree trunk. All roots 1-inch or larger in diameter that are cut, broken, or otherwise sev-ered during construction operations shall have the end smoothly cut perpendicular to the root. Roots exposed during excavation or other operations shall be covered with moist earth or backfilled as soon as possible to prevent the roots from drying out.

3. Marking The limits of the area(s) to be cleared and grubbed will be marked by stakes, flags, tree markings, or other suitable methods. Trees to be left standing and uninjured will be designated by special markings placed on the trunk about 6 feet above the ground surface.

4. Clearing and grubbing All trees not marked for preservation and all snags, logs, brush, stumps, shrubs, rubbish, and similar materials shall be cleared from within the limits of the designated areas. Unless otherwise specified, all stumps, roots, and root clusters that have a diameter of 1 inch or larger shall be grubbed out to a depth of at least 2 feet below subgrade for concrete structures and 1 foot below the ground surface at embank-ment sites and other designated areas.

5. Disposal All materials cleared and grubbed from the designated areas shall be disposed of at locations shown on the drawings or in a manner specified in section 7. The contractor is responsible for complying with all local rules and regulations and the payment of any and all fees that may result from disposal at locations away from the project site.

6. Measurement and payment Method 1—For items of work for which specific units prices are established in the contract, the cleared and grubbed area is measured to the nearest 0.1 acre. Payment for clearing and grubbing is made for the total area within the designated limits at the contract unit price. Such payment will constitute full com-pensation for all labor, equipment, tools, and all other items necessary and incidental to the completion of the work.

(210-VI-NEH, May 2001)

Method 2—For items of work for which specific unit prices are established in the contract, the length of the cleared and grubbed area is measured to the nearest full station (100 feet) along the line designated on the drawing or identified in the specifications. Payment for clearing and grubbing is made for the total length within the designated limits at the contract unit price. Such payment will constitute full compensation for all labor, equipment, tools, and all other items necessary and incidental to the comple-tion of the work.

Method 3—For items of work for which specific unit prices are established in the contract, each tree, stump, and snag having a diameter of 4 inches or larger and each log having a diameter of 4 inches or larger and a length of 10 feet are measured before removal. The size of each tree and snag is determined by measuring its trunk at breast height above the natural ground surface. The size of each log is deter-mined by measuring the butt and by measuring its length from butt to tip. The size of each stump is measured at the top. Diameter is determined by dividing the measured circumference by 3.14.

Payment for clearing and grubbing of each tree, stump, and snag having a diameter of 4 inches or larger and each log having a diameter of 4 inches or larger and a length of 10 feet or larger is made at the con-tract unit price for its size designation as determined by the following schedule:

Measured diameter Size designation

(in) (in)

4 to 8 6

8 to 12 10

12 to 24 18

24 to 36 30

36 to 60 48

Over 60 60

The sum of such payments shall constitute full compensation for clearing and grubbing (including the clearing and grubbing of smaller trees, stumps, snags, logs, brush, shrubs, and roots), applicable permits and associated fees, and rubbish removal. Such payment shall constitute full compensation for all labor, equipment, tools, and all other items necessary and incidental to the completion of the work.

Method 4—For items of work for which specific lump sum prices are established in the contract, pay-ment for clearing and grubbing is made at the contract lump sum price. Such payment shall constitute full compensation for all labor, equipment, tools, and all other items necessary and incidental to the completion of the work.

All Methods—The following provisions apply to all methods of measurement and payment. Compensa-tion for any item of work described in the contract, but not listed in the bid schedule will be included in the payment for the item of work to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in section 7.

7. Items of work and construction details

2–2

NRCS – NOVEMBER 2022

PUERTO RICO – DAGUEY DAM REPAIRS 2-3

Items of work and construction details

The following construction details are applicable to all items of work covered by this specification:

(1) In Section 4, Clearing and Grubbing: Upon completion of the clearing and grubbing operation, all areas, which have been cleared and grubbed, shall be dressed to be reasonably smooth by blading, dragging or floating. The entire area shall be reasonably free of abrupt mounds, dips, and windrows to provide a clear area for construction staking.

(2) In Section 5, Disposal:

(a) All materials removed from the cleared and grubbed areas shall be disposed of by chipping for use onsite as mulch or at an offsite disposal area of the Contractor’s own choosing. All disposal methods shall be in accordance with state and local regulations and approved by the Contracting Officer.

(b) All trees, snags, logs, brush, shrubs, stumps, and rubbish that are felled, detached, or otherwise dislocated in or near stream channels shall be disposed of as specified or removed to higher ground prior to the end of each workday. The Contractor is to take precaution, when temporarily stockpiling cleared and grubbed materials, to guard against such cleared and grubbed materials being floated or transported off the worksite by rainstorm runoff.

Items of work to be performed in conformance with this specification are:

Bid Item 1, Tree Removal

(1) This item shall consist of removing trees on the upstream and downstream slopes of the embankment. Trees less than 6” in diameter shall be cut at the ground level. Trees greater than 6” in diameter shall be marked within 10 days of contract award for consultation by NRCS and CLO. NRCS shall approve trees to be removed prior to proceeding with tree removal. Trees greater than 6” in diameter shall be cleared and grubbed according to this specification.

(2) Tree roots shall be removed to firm material 9 to 12 inches below surface of root and compacted fill shall be used to restore these areas to match the surrounding slope.

(3) All tree removal requires permitting by the Puerto Rico DNER.

(4) In Section 6, Measurement and Payment, Method 4 shall apply.

(a) The approximate area of the upstream and downstream slopes is 4 acres. Actual quantity of trees to removed shall be determined by NRCS.

(5) Items of work subsidiary to this bid item are:

(a) Earthfill, Tree Removal as specified in Construction Specification 23, Earthfill

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Subsidiary Item, Clearing and Grubbing

(1) This item shall consist of all clearing and grubbing including debris removal as indicated herein, or staked at the time of the site showing including, (1) to a minimum

10 feet outside of the areas to be occupied by earthfill (including the headcut area downstream of the auxiliary spillway, constructed auxiliary spillway between approximately Sta. 0+00 to 5+00, channel downstream of principal spillway); (2) areas of required common excavation; and (3) to any additional areas required to perform the work.

(2) Separate payment will not be made for this item. Compensation for this item will be included in the payment for the following item(s):

(a) Bid Item 13, Excavation, Common,

(b) Bid Item 14, Earthfill, Common,

(c) Bid Item 16, Rock Riprap, Principal Spillway Channel.

Construction Specification 3—Structure Removal

1. Scope The work shall consist of the removal, salvage, and disposal of structures (including fences) from the designated areas.

2. Marking Method 1—Each structure or structure part to be removed will be marked with stakes, flags, paint, or other suitable method.

Method 2—The area boundaries from which structures must be removed will be marked using stakes, flags, paint, or other suitable method. Structures to remain undisturbed or to be salvaged will be desig-nated by special markings.

3. Removal Method 1—All structures designated for removal in the contract shall be removed to the specified ex-tent and depth.

Method 2—Within the areas so marked, all visible and buried structures identified shall be removed to the specified extent and depth.

4. Salvage Structures or structure parts that are designated to be salvaged shall be carefully removed and neatly placed in the specified or approved storage location. Salvaged structures that are capable of being disas-sembled shall be dismantled into individual members or sections. Such structures shall be neatly and systematically match marked with paint before disassembly. All connectors and other parts shall be marked to indicate their proper location within the structure and shall be fastened to the appropriate structural member or packed in suitable containers.

Material from fences designated to be salvaged shall be placed outside the work area on the property on which the fence was originally located. Fence wire shall be rolled into uniform rolls of suitable size and neatly piled with other salvaged materials. Posts and rails shall be neatly stacked.

5. Disposal of refuse materials Refuse materials resulting from structure removal shall be disposed of in a manner and at locations specified in section 7 of this specification or in an acceptable manner and at locations approved by the contracting officer. Disposal by burning shall be in accordance with local rules and regulations.

6. Measurement and payment Method 1—For items of work for which specific unit prices are established by the contract, payment for the removal of each structure unit, except fences, is made at the contract unit price. Fences removed or removed and salvaged are measured to the nearest linear foot. Payment for fence removal or removal and salvage is made at the contract unit prices for each type and size of fence.

Such payment will constitute full compensation for all labor, equipment, tools, applicable permits and associated fees for burning and disposal of refuse, and all other items necessary and incidental to the completion of the work.

Method 2—For items of work for which specific lump sum prices are established by the contract, pay-ment for structure removal is made at the contract lump sum price.

3–1

Such payment will constitute full compensation for all labor, equipment, tools, applicable permits and associated fees for burning and disposal of refuse, and all other items necessary and incidental to the completion of the work.

All Methods—The following provisions apply to all methods of measurement and payment. Compensa-tion for any item of work described in the contract, but not listed as a contract line item number in the bid schedule, is included in the payment for the item of work to which it is made subsidiary. Such items and items to which they are made subsidiary are identified in section 7 of this specification.

3–2

PUERTO RICO – DAGUEY DAM REPAIRS 3-3

Items of work and construction details

The following construction details are applicable to all items of work covered by this specification:

(1) In Section 2, Marking, Method 1 shall apply.

(2) In Section 3, Removal, Method 1 shall apply. Rock riprap designated for removal shall be removed to its originally constructed thickness/depth of 2 feet or to the top of coarse drainfill. All fences designated for removal shall be removed to the bottom of the post and/or footing.

(3) In Section 5, Disposal, all materials that are not salvaged shall be disposed of by the

Contractor at sites of his own choosing at an off-site location. This disposal shall be in accordance with all applicable Federal, State, and local laws, rules, and regulations.

Contractor shall provide a bill of lading or equivalent documentation to demonstrate that materials were disposed of appropriately.

(4) In Section 6, Measurement and Payment, Method 2 shall apply.

Items of work to be performed in conformance with this specification are:

a. Bid Item 2, Structure Removal, Rock Riprap

(1) This item shall consist of removing all rock riprap as indicated in the construction drawings including, rock riprap around the impact basin.

(2) In Section 4, Salvage, with the approval of the Contracting Officer, the Contractor may choose to stockpile and salvage the removed rock riprap if demonstrated to meet the requirements of new rock riprap. This work shall be performed as specified in

Construction Specification 61, Rock Riprap.

(3) Items of work subsidiary to this bid item are:

(a) Excavation, Common, Structure Removal as specified in Construction

Specification 21, Excavation as required to perform this item of work.

b. Bid Item 3, Structure Removal, Fences

(1) This item shall consist of removing all fences, regardless of type as indicated in the construction drawings including, wire, mesh, posts, corners, braces, gates, and/or cattle guards unless otherwise indicated to remain.

(2) All holes and/or excavations required for the structure removal of fences shall be backfilled with in-situ materials. All backfill shall be tamped in 6” lifts and continue until the backfill is mounded above the surrounding topography.

(3) Items of work subsidiary to this bid item are:

(a) Excavation, Common, Structure Removal as specified in Construction

Specification 21, Excavation as required to perform this item of work.

PUERTO RICO – DAGUEY DAM REPAIRS 3-4

c. Subsidiary Item, Existing Handrail Removal

(1) This item shall consist of removal of the existing handrail on the impact basin as indicated on the construction drawings.

(2) Separate payment will not be made for this item. Compensation for this item will be included in the payment for the following item:

(a) Bid Item 17, Metal Fabrications, Impact Basin Handrail

5–1(210–VI–NEH, January 2014)

1. Scope The work consists of installing measures or performing work to control erosion and minimize the production of sediment and other pollutants to water and air from construction activities.

The following BioPreferred® product categories are applicable to this specification:

— mulch and compost materials

— erosion control materials

— fertilizers

— dust suppressants

— agricultural spray adjuvants

2. Material Silt fence shall conform to the requirement of Materials Specification 592, Geotextile. All other material furnished shall meet the requirements of the material specifications listed in section 8 of this specification.

3. Erosion and sediment control measures and works The measures and works shall include, but are not limited to, the following:

Staging of earthwork activities—The excavation and moving of soil materials shall be scheduled to minimize the size of areas disturbed and unprotected from erosion for the shortest reasonable time.

Seeding—Seeding to protect disturbed areas shall occur as soon as reasonably possible following completion of that earthwork activity.

Mulching—Mulching to provide temporary protection of the soil surface from erosion.

Diversions—Diversions to divert water from work areas and to collect water from work areas for treatment and safe disposition. They are temporary and shall be removed and the area restored to its near original condition when the diversions are no longer required or when permanent measures are installed.

Stream crossings—Culverts or bridges where equipment must cross streams. They are temporary and shall be removed and the area restored to its near original condition when the crossings are no longer required or when permanent measures are installed.

Sediment basins—Sediment basins collect, settle, and eliminate sediment from eroding areas from impacting properties and streams below the construction site(s). These basins are temporary and shall be removed and the area restored to its original condition when they are no longer required or when permanent measures are installed.

Sediment filters—Straw bale filters or geotextile silt fences trap sediment from areas of limited runoff. Sediment filters shall be properly anchored to prevent erosion under or around them. Silt fences shall be installed and main-tained in accordance with ASTM D6462. These filters are temporary and shall be removed and the area restored to its original condition when they are no longer required or when permanent measures are installed.

Waterways—Waterways for the safe disposal of runoff from fields, diversions, and other structures or measures.

These works are temporary and shall be removed and the area restored to its original condition when they are no longer required or when permanent measures are installed.

Construction Specification 5—Pollution Control

5–2 (210–VI–NEH, January 2014)

Other—Additional protection measures as specified in section 8 of this specification or required by Federal, State, or local government.

4. Chemical pollution The contractor shall provide watertight tanks or barrels or construct a sump sealed with plastic sheets to collect and temporarily contain chemical pollutants, such as drained lubricating or transmission fluids, grease, soaps, concrete mixer washwater, or asphalt, produced as a by-product of the construction activities. Pollutants shall be disposed of in accordance with appropriate state and Federal regulations. At the completion of the construction work, tanks, barrels, and sumps shall be removed and the area restored to its original condition as specified in sec-tion 8 of this specification. Sump removal shall be conducted without causing pollution.

Sanitary facilities, such as chemical toilets, or septic tanks shall not be located next to live streams, wells, or springs. They shall be located at a distance sufficient to prevent contamination of any water source. At the comple-tion of construction activities, facilities shall be disposed of without causing pollution as specified in section 8 of this specification.

5. Air pollution The burning of brush or slash and the disposal of other materials shall adhere to state and local regulations.

Fire prevention measures shall be taken to prevent the start or spreading of wildfires that may result from project activities. Firebreaks or guards shall be constructed and maintained at locations shown on the drawings.

All public access or haul roads used by the contractor during construction of the project shall be sprinkled or otherwise treated to fully suppress dust. All dust control methods shall ensure safe construction operations at all times. If chemical dust suppressants are applied, the material shall be a commercially available product specifically designed for dust suppression and the application shall follow manufacturer's requirements and recommendations.

A copy of the product data sheet and manufacturer's recommended application procedures shall be provided to the engineer 5 working days before the first application.

6. Maintenance, removal, and restoration All pollution control measures and temporary works shall be adequately maintained in a functional condition for the duration of the construction period. All temporary measures shall be removed and the site restored to near original condition.

7. Measurement and payment Method 1—For items of work for which specific unit prices are established in the contract, each item is measured to the nearest unit applicable. Payment for each item is made at the contract unit price for that item. For water or chemical suppressant items used for dust control for which items of work are established in section 8 of this speci-fication, measurement for payment will not include water or chemical suppressants that are used inappropriately or excessive to need. Such payment will constitute full compensation for the completion of the work.

Method 2—For items of work for which lump sum prices are established in the contract, payment is made as the work proceeds and supported by invoices presented by the contractor that reflect actual costs. If the total of all progress payments is less than the lump sum contract price for this item, the balance remaining for this item will be included in the final contract payment. Payment of the lump sum contract price will constitute full compensa-tion for completion of the work.

Method 3—For items of work for which lump sum prices are established in the contract, payment will be prorated and provided in equal amounts on each monthly progress payment estimate. The number of months used for pro-rating shall be the number estimated to complete the work as outlined in the contractor's approved construction schedule. The final month's prorate amount will be provided with the final contract payment. Payment as described will constitute full compensation for completion of the work.

5–3(210–VI–NEH, January 2014)

All Methods—The following provisions apply to all methods of measurement and payment. Compensation for any item of work described in the contract, but not listed in the bid schedule is included in the payment for the item of work to which it is made subsidiary. Such items, and the items to which they are made subsidiary, are identified in section 8 of this specification.

8. Items of work and construction details

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Items of work and construction details

The following construction details are applicable to all items of work covered by this specification:

(1) A Storm Water Pollution Prevention Plan (SWPPP) is required for the construction site. The Contracting Officer has prepared the minimum requirements for the SWPPP as shown on the drawings. The Contractor shall review the minimum requirements

SWPPP and shall prepare a plan with a detailed work sequence outline that defines and delineates the proposed construction operation. The SWPPP shall be signed by the

Contractor and submitted to the Contracting Officer prior to issuance of the Notice to

Proceed. A copy of the approved SWPPP, as amended, will be maintained at the construction site by the Contractor. A copy of the permit shall be attached to the

SWPPP.

(2) If the Contractor identifies sediment control items, which are considered essential to the anticipated construction operation, but which are not reflected by the contract bid schedule, a written request will be provided to the Contracting Officer. The request will identify the items, operation, and provide an assessment of changes to the contract cost and performance time.

(3) The Contracting Officer, and the Contractor (or designated Contractor’s representative) shall perform periodic inspections of the sediment control practices.

Inspections shall be conducted at a minimum of every 14 calendar days and within 24 hours of any rainfall event of 0.5 inches or greater at the construction site. After each inspection, a written report will be prepared which summarizes the status of inspected items. The reports will (a) evaluate effectiveness, (b) identify maintenance needs and/or (c) recommend remedial corrective action. The report shall be filed on site in the same location as the SWPPP.

(4) The SWPPP shall be in compliance with the Puerto Rico Department of Natural and

Environmental Resources’ Regulation 5754, “Regulations for Erosion Control and

Sedimentation Prevention” requirements.

Items of work to be performed in conformance with this specification are:

Bid Item 4, Silt Fence

(1) This item shall consist of furnishing and installing silt fence as indicated in the construction drawings including, around disturbed areas with limited runoff, staging area, and as otherwise needed to control sediment from leaving the construction site.

(2) In Section 2, Materials, geotextiles used for silt fence shall be non-woven Class I.

Geotextile shall have an Apparent Opening Size (AOS) of less than or equal to 0.2 mm.

(3) In Section 3, Erosion and Sediment Control Measures and Works, Sediment filters shall be limited to geotextile sediment filters.

(4) In Section 7, Measurement and payment, Method 1 shall apply.

(a) The estimated length of silt fence (sediment filter) to be installed is 870 linear feet.

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Bid Item 5, Pollution Control

(1) This item shall consist of furnishing all materials, labor, and equipment necessary to implement the Storm Water Pollution Prevention Plan (SWPPP) and limit the amount of sediment and other pollution from construction activities. Pollution control shall be provided as required at ingress / egress roads, haul roads, parking areas, stockpiles, earthfill and excavation activities and any other areas producing sediment or other pollution. This item shall also consist of all work required to maintain and remove each pollution control measure (including silt fence) and restore the location following removal.

(2) In Section 2, Materials, geotextiles used for the stabilized construction entrance shall be non-woven Class I. Geotextile shall have an Apparent Opening Size (AOS) of less than or equal to 0.2 mm.

(3) In Section 3, Erosion and Sediment Control Measures and Works, erosion and sediment control works shall be limited to rock berms, stabilized construction entrances, and sediment filters as shown on the drawings. If other erosion and sediment control works are required by the Contracting Officer, such measures will be considered added work.

(4) In Section 4, Chemical Pollution:

(a) Chemical toilets used during construction shall be removed from the site and disposed of in conformance with state and local regulations.

(b) Sump pits with liners or containers shall be used during construction to collect fuel spills and for storage of chemical pollutants, such as petroleum products. All containers, liners, and pollutants shall be removed from the site. The removal shall include materials used to line the pit and any soils contaminated. All pollutants, containers, and/or polluted soils shall be removed and disposed of in conformance with Federal, State, and local regulations. A written plan to satisfactorily collect and dispose of pollutants such as oil spills from equipment, fuel spills at refueling facilities, anti-freeze, and other chemical pollutants will be provided to the

Contracting Officer prior to the issuance of a notice to proceed.

(5) In Section 7, Measurement and Payment, Method 3 shall apply.

(6) Items of work subsidiary to this bid are:

(a) Water for Construction, as specified in Construction Specification 10, Water for

Construction as it applies to this item.

(b) Geotextile, as specified in Construction Specification 95, Geotextile as it applies to this item.

PUERTO RICO – DAGUEY DAM REPAIRS 6-4

Items of work and construction details

The following construction details are applicable to all items of work covered by this specification:

(1) In Section 2, Material, Fertilizer:

(a) Fertilizer shall be of the pelleted form and shall be uniformly mixed. Where fertilizer is furnished from bulk storage, the Contractor shall furnish a supplier’s certification of analysis and weight.

(2) In Section 3, Seeding mixtures, sod, sprigs, and dates of planting, Vegetation may be planted year-round.

(3) In Section 5, Seeding, Sprigging, Fertilizing, Mulching, and Stabilizing:

(a) Prior to planting the grasses, fertilizer shall be applied and worked into the soil by disking with a weighted tandem disk to a depth of approximately 4 inches. No fertilizer shall be applied when the ground is excessively wet, frozen, or otherwise in an untillable condition. The rate of application of the fertilizer shall be to apply

80 lbs per acre of each Nitrogen, Phosphorous, and Potassium.

(b) Mulch shall be applied in a reasonably continuous unbroken cover of uniform thickness at a rate of 2-1/2 tons of air-dry hay per acre. Straw mulch including invasive plant species shall not be allowed. Hay mulch shall be free of noxious weed seeds and other invasive pests and mix should be approved by the

Contracting Officer. Hay mulch should have been harvested at a time when stems are available.

(c) Mulch shall be anchored into the soil to a minimum depth of 2 inches by pinning, crimping, or other methods approved by the Contracting Officer. Anchoring shall be done on the approximate contour at a spacing of no more than 8 inches and set to run straight. The operation shall be such that approximately 50% of the mulch material remains on the soil surface after anchoring. The mulch shall be anchored within the same day as spreading.

(d) When working on slopes which are steeper than 3:1 horizontal to vertical, all rubber tire equipment on the slope will be held with truck or tractor and winch line with the truck or tractor operating along the crown of the embankment or other suitable flat surface. As an alternative, track (crawler) equipment with a low center of gravity may be used to perform work on slopes without a winch line requirement when operated in accordance with applicable OSHA requirements.

Items of work to be performed in conformance with this specification are:

Bid Item 6, Vegetation, Seeding

(1) This item shall consist of all seeding at the site as indicated in the construction drawings, as specified in the approved pollution prevention plan, as determined by the

Contracting Officer or in other disturbed areas resulting from construction activities.

This item shall include the site preparation; furnishing, fertilizing, and applying seed;

PUERTO RICO – DAGUEY DAM REPAIRS 6-5

and placing and anchoring hay mulch. Areas that do not require vegetation are those upstream of the dam which will routinely be submerged below the principal spillway crest elevation.

(2) In Section 2, Material, Seed:

(a) Seed of high quality customarily sold in the trade is required.

(b) The seed shall not contain any objectionable foreign material that will hinder proper distribution. Examples of objectionable foreign material include long sticks and stems, unthrashed seed heads with stems attached or any other objects not normally found in reasonable quality lots of grass seeds.

(c) In the last sentence of the second paragraph, the maximum time from testing before delivery shall be changed from 9 months to 6 months. The sentence shall thus read

“No seed will be accepted with a test date more than 6 months before the delivery date to the site.”

(d) The seed must be in sound, clean bags with each bag containing a tag showing, among other things with respect to the contents of the bag, name of the seed, locality and year of harvest, and the percentage of purity and germination.

(e) Bag tag figures will be accepted for purity and germination, and the seed will either be accepted or rejected by the Contracting Officer based on the bag tag test.

(f) Seeding rates are for “Pure Live Seed (PLS)”; therefore, the percentage of purity as shown on the seed tag will determine the number of pounds of bulk material needed to obtain the required amount of pure live seed per acre.

(3) In Section 3, Seeding Mixtures, Sod, Sprigs, and Dates of Planting:

(a) The seed mixture and application rate shall be:

Seed Type Application Rate

Common Bahiagrass 3.0 lb. PLS per Acre

Rio Bermudagrass 3.0 lb. PLS per Acre

Perennial Ryegrass 3.0 lb. PLS per Acre

(4) In Section 4, Seedbed preparation and treatment, the grass seed shall be drilled onto a firm, clean seedbed. Rills and gullies shall be filled or tilled if needed prior to seeding.

(5) In Section 5, Seeding, Sprigging, Fertilizing, Mulching, and Stabilizing:

(a) Seed drilled shall be on the approximate contour. A grass seed drill equipped with depth control bands, grain drill with a grass seed attachment, or Brillion (type) seeder shall be used. The seed shall not be planted or covered deeper than 1/4 inch below the soil surface. The distance between rows shall not exceed 6 inches. Seed shall be distributed over the entire area at uniform rates. Planting operations shall begin at the base of the slope on works of improvement. The areas shall be firmed before seeding and immediately following seeding with a cultipacker or corrugated packer roller weighing 180 to 190 pounds per foot of width. More weight shall be added as required. Only on areas not accessible to the drilling equipment may seed

PUERTO RICO – DAGUEY DAM REPAIRS 6-6

be broadcast by hand. The hand seeded areas shall be hand raked and then firmed with a hand-operated roller. Alternatively, the grass seed may be blended into the compost and applied per paragraph 7. (3)(b) of this section.

(6) In Section 6, Measurement and Payment, Method 1 shall apply. Measurement shall be based upon horizontal plan area with no adjustment for slopes.

(a) The estimated area of seeding is 2.9 acres.

Bid Item 7, Turf Reinforcement Mat

(1) This item shall consist of supplying and installing turf reinforcement mat (TRM) on the left downstream groin, as indicated in the construction drawings. The mat should be installed in accordance with manufacturer instructions and recommendations.

(2) This item also includes any minor grading or fill associated with the installation of the mat as required for accordance with manufacturer guidelines.

(3) Seeding and fertilizing requirements also apply to areas to be covered by TRM.

(4) In Section 6, Measurement and Payment, Method 1 shall apply. Measurement shall be made to the nearest square yard of surface area covered and accepted.

(a) The estimated area of turf reinforcement mat is 660 square yards.

(210-VI-NEH, Amend. 2, Sept. 2018) 6–1

Construction Specification 6—Seeding, Sprigging, and Mulching

1. Scope The work consists of preparing the area for treatment; furnishing and placing seed, sprigs, mulch, fertilizer, inoculant, lime, and other soil amendments; and anchoring mulch in designated areas as specified.

The following BioPreferred® product categories are applicable to this specification:

— Mulch and compost materials

— Erosion control materials

— Fertilizers

— Agricultural spray adjuvants

2. Material Seed—All seed must conform to the current rules and regulations of the State where it is being used and must be from the latest crop available. It must meet or exceed the standard for purity and germination listed in section 7.

Seed must be labeled in accordance with State laws and U.S. Department of Agriculture rules and regulations under the Federal Seed Act in effect on the date of invitations for bids. Bag tag figures are evidence of purity and germination. No seed may be accepted with a test date of more than 9 months before the date of delivery to the site.

Seed that has become wet, moldy, or otherwise damaged in transit or storage will not be accepted. The percent of noxious weed seed allowable must be as defined in the current State laws relating to agricultural seeds. Each type of seed must be delivered in separate sealed containers and fully tagged unless an exception is granted in writing by the contracting officer.

Fertilizer—Unless otherwise specified, the fertilizer must be a commercial-grade fertilizer. It must meet the standard for grade and quality specified by State law. Where fertilizer is furnished from bulk storage, the contractor must furnish a supplier’s certification of analysis and weight. When required by the contract, a representative sample of the fertilizer must be furnished to the contracting officer for chemical analysis.

Inoculants—The inoculant for treating legume seeds must be a pure culture of nitrogen-fixing bacteria prepared specifically for the species and must not be used later than the date indicated on the container or as otherwise specified. A mixing medium, as recommended by the manufacturer, must be used to bond the inoculant to the seed. Two times the amount of the inoculant recommended by the manufacturer must be used, except that four times the amount must be used when seed is applied using a hydraulic seeder. Seed must be sown within 24 hours of treatment and must not remain in the hydraulic seeder longer than 4 hours.

Lime and other soil amendments—Lime must consist of standard ground agriculture limestone, or approved equivalent. Standard ground agriculture limestone is defined as ground limestone meeting current requirements of the State department of agriculture.

Other soil amendments must meet quality criteria and application requirements specified in section 7.

Mulch tackifiers—Asphalt emulsion tackifiers must conform to the requirements of ASTM D977, Specification for Emulsified Asphalt. The emulsified asphalt may be rapid setting, medium setting, or slow setting. Nonasphaltic tackifiers required because of environmental considerations must be as specified in section 7.

Straw mulch material—Straw mulch must consist of wheat, barley, oat or rye straw, hay, grass cut from native grasses, or other plants as specified in section 7. The mulch material must be air-dry, reasonably light in color, and must not be musty, moldy, caked, or otherwise of low quality. The use of mulch that contains noxious weeds is not permitted. The contractor must provide a method satisfactory to the contracting officer for determining weight of mulch furnished.

Other mulch materials—Mulching materials, such as wood cellulose fiber mulch, mulch tackifiers, synthetic fiber mulch, netting, and mesh may be required for specialized locations and conditions. These materials, when specified, must be accompanied by the manufacturer’s recommendations for methods of application.

3. Seeding mixtures, sod, sprigs, and dates of planting The application rate per acre for seed mixtures, sprigs, or sod and date of seeding or planting must be as shown on the plans or as specified in section 7.

6–2 (210-VI-NEH, Amend. 2, Sept. 2018)

4. Seedbed preparation and treatment Areas to be treated must be dressed to a smooth, firm surface. On sites where equipment can operate on slopes safely, the seedbed must be adequately loosened (4 to 6 inches deep) and smoothed. Depending on soil and moisture conditions, disking or cultipacking, or both, may be necessary to properly prepare a seedbed. Where equipment cannot operate safely, the seedbed must be prepared by hand methods by scarifying to provide a roughened soil surface so that broadcast seed will remain in place.

If seeding is to be accomplished immediately following construction operations, seedbed preparation may not be required except on a compacted, polished, or freshly cut soil surface.

Rocks larger than 6 inches in diameter, trash, weeds, and other debris that will interfere with seeding or maintenance operations must be removed or disposed of as specified in section 7.

Seedbed preparation must be discontinued when soil moisture conditions are not suitable for the preparation of a satisfactory seedbed as determined by the responsible engineer.

5. Seeding, sprigging, fertilizing, mulching, and stabilizing All seeding or sprigging operations must be performed in such a manner that the seed or sprigs are applied in the specified quantities uniformly in the designated areas. The method and rate of seed application must be as specified in section 7. Unless otherwise specified, seeding or sprigging must be accomplished within 2 days after final grading is completed and approved.

Fertilizer, lime, and other soil amendments must be applied as specified in section 7. When specified, the fertilizer and soil amendments must be thoroughly incorporated into the soil immediately following surface application.

The rate, amount, and kind of mulching or mesh must be as specified in section 7. Mulches must be applied uniformly to the designated areas. They must be applied to areas seeded not later than 2 working days after seeding has been performed. Straw mulch material must be stabilized within 24 hours of application using a mulch crimper or equivalent anchoring tool or by a suitable tackifier. When the mulch crimper or equivalent anchoring tool is used, it must have straight blades and be the type manufactured expressly for and capable of firmly punching the mulch into the soil. Where the equipment can be safely operated, it must be operated on the contour. Hand methods must be used where equipment cannot safely operate to perform the work required.

The tackifier must be applied uniformly over the mulch material at the specified rate, or it must be injected into the mulch material as it is being applied. Mesh or netting stabilizing materials must be applied smoothly but loosely on the designated areas. The edges of these materials must be buried or securely anchored using spikes or staples as specified in section 7.

The contractor must maintain the mesh or netting areas until all work under the contract has been completed and accepted.

Maintenance must consist of the repair of areas damaged by water erosion, wind, fire, or other causes. Such areas must be repaired to reestablish the intended condition and to the design lines and grades required by the contract. The areas must be refertilized, reseeded, and remulched before the new application of the mesh or netting.

6. Measurement and payment Method 1—For items of work for which specific unit prices are established in the contract, each area treated is measured as specified in section 7 and the area is calculated to the nearest 0.1 acre. Payment for treatment is made at the contract unit price for the designated treatment, which will constitute full compensation for completion of the work.

When specified as an item of work, mesh or netting is measured to the nearest square yard of surface area covered and accepted.

Payment is made at the contract unit price and will constitute full compensation for completion of the work.

(210-VI-NEH, Amend. 2, Sept. 2018) 6–3

Method 2—For items of work for which specific lump-sum prices are established in the contract, the quantity of work will not be measured for payment. Payment for this item is made at the contract lump-sum price for the item and constitutes full compensation for the completion of the work.

Method 3—For items of work for which lump-sum prices are established in the contract, payment is made as the work proceeds.

Progress payments are determined as specified in section 7. Payment of the lump sum contract price constitutes full compensation for completion of the work.

All Methods—The following provisions apply to all methods of measurement and payment. Compensation for any item of work described in the contract but not listed in the bid schedule is included in the payment for the item of work to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in section 7.

7–1(210–VI–NEH, January 2009)

1. Scope The work consists of performing all surveys, measurements, and computations required by this specification.

2. Equipment and material Equipment for construction surveys shall be of a quality and condition to provide the required accuracy. The equip-ment shall be maintained in good working order and in proper adjustment at all times. Records of repairs, calibra-tion tests, accuracy checks, and adjustments shall be maintained and be available for inspection by the engineer.

Equipment shall be checked, tested, and adjusted as necessary in conformance with manufacturer's recommenda-tions.

Material is field notebooks, stakes, templates, platforms, equipment, spikes, steel pins, tools, and all other items necessary to perform the work specified.

3. Quality of work All work shall follow recognized professional practice and the standards of the industry unless otherwise specified in section 9 of this specification. The work shall be performed to the accuracy and detail appropriate for the type of job. Notes, sketches, and other data shall be complete, recorded neatly, legible, reproducible and organized to facilitate ease in review and allow reproduction of copies for job documentation. Survey equipment that requires little or no manual recording of field data shall have survey information documented as outlined in section 9 of this specification.

All computations shall be mathematically correct and shall include information to identify the bid item, date, and who performed, checked, and approved the computations. Computations shall be legible, complete, and clearly document the source of all information used including assumptions and measurements collected.

If a computer program is used to perform the computations, the contractor shall provide the engineer with the software identification, vendor's name, version number, and other pertinent data before beginning survey activities.

Computer generated computations shall show all input data including values assigned and assumptions made.

The elevations of permanent and temporary bench marks shall be determined and recorded to the nearest 0.01 foot. Differential leveling and transit traverses shall be of such precision that the error of vertical closure in feet shall not exceed plus or minus 0.1 times the square root of the traverse distance in miles. Linear measurements shall be accurate to within 1 foot in 5,000 feet, unless otherwise specified in section 9 of this specification. The an-gular error of closure for transit traverses shall not exceed 1 minute times the square root of the number of angles turned.

The minimum requirements for placing slope stakes shall be at 100-foot stations for tangents, as little as 25 feet for sharp curves, breaks in the original ground surface and at any other intermediate stations necessary to ensure accurate location for construction layout and measurement. Slope stakes and cross sections shall be perpendicular to the centerline. Significant breaks in grade shall be determined for cross sections. Distances shall be measured horizontally and recorded to the nearest 0.1 foot. Side shots for interim construction stakes may be taken with a hand level.

Unless otherwise specified in section 9 of this specification, measurements for stationing and establishing the loca-tion of structures shall be made to the nearest 0.1 foot.

Construction Specification 7—Construction Surveys

7–2 (210–VI–NEH, January 2009)

Elevations for concrete work, pipes, and mechanical equipment shall be determined and recorded to the nearest

0.01 foot. Elevations for earth work shall be determined and recorded to the nearest 0.1 foot.

4. Primary control The baselines and bench marks for primary control, necessary to establish lines and grades needed for construc-tion, are shown on the…