NRCS_Techical_Specifications.pdf

Technical Construction and Material

Specifications and Guidelines for the

Alameda Isles Ditch Restoration Project

100% Design Submittal

Prepared for:

Sarasota County Public Works

1660 Ringling Blvd.

Sarasota, Florida 34236 and

Natural Resources Conservation Service (NRCS)

6942 Professional Parkway

Sarasota, Florida 34240

Prepared by:

WSP USA

Environment & Infrastructure Inc.

3701 NW 98th Street

Gainesville, FL, 32606

WSP Project No.: 600814.2

October 2024

Alameda Isles Project i August 2024

Sarasota County, FL

TABLE OF CONTENTS

Construction Specification 2—Clearing and Grubbing ............................................................ 2-1

Construction Specification 3—Structure Removal ................................................................... 3-1

Construction Specification 5—Pollution Control ..................................................................... 5-1

Construction Specification 7—Construction Surveys .............................................................. 7-1

Construction Specification 8—Mobilization and Demobilization ............................................ 8-1

Construction Specification 11—Removal of Water ............................................................... 11-1

Construction Specification 21—Excavation .......................................................................... 21-1

Construction Specification 23—Earthfill ............................................................................... 23-1

Construction Specification 24—Drainfill .............................................................................. 24-1

Construction Specification 32—Structure Concrete ............................................................... 32-1

Construction Specification 34—Steel Reinforcement ............................................................ 34-1

Construction Specification 45—Plastic Pipe .......................................................................... 45-1

Construction Specification 61—Rock Riprap ........................................................................ 61-1

Construction Specification 65—Articulating Concrete Block Revetment System .................. 65-1

Construction Specification 94— Contractor Quality Control ................................................. 94-1

Construction Specification 95—Geotextile ............................................................................ 95-1

Construction Specification 440—Vegetative Measures ....................................................... 440-1

Construction Specification 441---Exotic Species Removal .................................................. 441-1

Material Specification 521—Aggregates for Drainfill and Filters ........................................ 521-1

Material Specification 522—Aggregates for Portland Cement Concrete .............................. 522-1

Material Specification 523—Rock for Riprap ...................................................................... 523-1

Material Specification 531—Portland Cement ..................................................................... 531-1

Material Specification 532—Supplementary Cementitious Materials .................................. 532-1

Material Specification 533—Chemical Admixtures for Concrete ........................................ 533-1

Material Specification 534—Concrete Curing Compound ................................................... 534-1

Material Specification 535—Preformed Expansion Joint Filler ........................................... 535-1

Material Specification 537—Nonmetallic Waterstops ......................................................... 537-1

Material Specification 538—Metallic Waterstops................................................................ 538-1

Material Specification 539—Steel Reinforcement (for concrete) ......................................... 539-1

Material Specification 547—Plastic Pipe............................................................................. 547-1

Material Specification 592—Geotextile ............................................................................... 592-1

Construction Specification 2 – Clearing and Grubbing (210-VI-NEH, May 2001)

Alameda Isles Project 2-1 August 2024

Construction Specifications

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 neglect 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 severed 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 embankment 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 result from disposal at locations away from the project site.

Alameda Isles Project 2-2 August 2024

6. Measurement and Payment

Method 1—For items of work for which specific unit 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 compensation for all labor, equipment, tools, and all other items necessary and incidental to the completion of the work.

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 completion 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 determined 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 contract unit price for its size designation as determined by the following schedule:

Measured diameter

(in)

Size designation

(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, payment 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.

Compensation for any item of work described in the contract, but not listed in the bid

Alameda Isles Project 2-3 August 2024 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

Items of work to be performed in conformance with this specification and the construction details are:

a. Bid Item No. 1, Clearing and Grubbing

(1) This item shall consist of the clearing and grubbing of the area required for the installation of the works of improvement as shown on the construction drawings. The

Contractor shall only clear and grub areas to the extent necessary for installation of the works of improvement. Unless otherwise approved by Engineer, all vegetation shall be cleared where works of improvement are shown.

(2) All cleared and grubbed materials shall become the property and responsibility of the

Contractor and shall be disposed of properly. The contractor must remove the material from the job site. All non-vegetative material must be removed off the job site.

(3) All tree stumps, brush, and root concentrations should be stripped and removed for a distance of at least five feet beyond the proposed construction limits of the proposed structures. Stripping shall minimize the disturbance of existing vegetation that is designated to remain.

(4) Any FLEPPC Category I exotic plant species encountered during the clearing and grubbing operation shall be treated according to Construction Specification 441

Invasive Exotic Plant Species Treatment.

(5) All clearing and grubbing shall be accomplished in such a manner as to minimize air and water pollution.

(6) In section 6 of this specification, Measurement and Payment, Method 4 will apply.

(7) Items of work subsidiary to this item are:

Construction Specification Section 441 Exotic Plant Species Treatment, Mechanical Treatment

END OF SECTION

Construction Specification 3 – Structure Removal (210-VI-NEH, May 2001)

Alameda Isles Project 3-1 August 2024

Construction Specification 3—Structure Removal

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 designated by special markings.

3. Removal

Method 1—All structures designated for removal in the contract shall be removed to the specified extent 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 disassembled 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, Items of work and construction details, 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

Construction Specification 3 – Structure Removal (210-VI-NEH, May 2001)

Alameda Isles Project 3-2 August 2024 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, payment for structure removal is made at the contract lump sum price.

Such payment will constitute full compensation for all labor, equipment, tools, and 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.

Compensation 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.

7. Items of work and construction details

Items of work to be performed in conformance with this specification and the construction details are:

a. Bid Item No. 8, Structure Removal

(1) This item consists of the removal of sections of seawall, the removal of the damaged sheet pile wall, and the removal of the existing ditch-block weir, as shown on the construction drawings.

(2) All items identified for structure removal shall be removed and stockpiled in the staging area. The structures shall become the Contractor’s responsibility to dispose of properly offsite. If approved by Sarasota County or the Engineer, displaced riprap onsite can be stockpiled and reused. Unsuitable soil encountered during excavation shall be disposed of properly to reduce environmental impacts as much as possible.

(3) Any voids created by removing the existing structures that are not within the proposed work footprint will be backfilled and compacted. Backfill compaction shall adhere to the specifications listed in Construction Specification 23 Earthfill, 10, d. Subsidiary

Item Earthfill, Class C Compaction, Structure Removal.

(4) In section 2 of this specification, Marking, Method 1 will apply.

(5) In section 3 of this specification, Removal, Method 1 will apply.

(6) In section 6 of this specification, Measurement and Payment, Method 1 will apply.

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

Excavation, Common, Structural

Earthfill, Class C Compaction, Structure Removal

Construction Specification 5 – Pollution Control (210-VI-NEH, January 2014)

Alameda Isles Project 5-1 August 2024

Construction Specification 5—Pollution Control

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 sediment fences trap sediment from areas of limited runoff. Sediment filters shall be properly anchored to prevent erosion under or around them. 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.

Alameda Isles Project 5-2 August 2024

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.

Other—Additional protection measures as specified in section 8 of this specification, items of work and construction detail 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 section 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 completion 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 trash 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 or as approved by Sarasota County Staff.

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

Alameda Isles Project 5-3 August 2024

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 specification, items of work and construction details, 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 compensation 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 prorating 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.

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

Items of work to be performed in conformance with this specification and the construction details are:

a. Bid Item No. 2, Pollution Control

(1) This item shall consist of precautions taken by the Contractor to minimize degradation of water quality passing through the job site during construction operations. All necessary precautions shall be taken to ensure compliance with water quality standards of the State of Florida. Attention is called to Chapter 62-350, Florida Administrative

Code and in particular the requirements that turbidity shall not exceed 29

Nephelometric Turbidity Units (NTU's) above natural background. Adequate silt containment procedures and equipment as displayed on the plans shall be used to control turbidity at all times.

(2) The Contractor shall be responsible for containment of pollution sources including, but not limited to, the required excavations, clearing and grubbing, earthfill, and other disturbed areas. Additionally, all tanks, barrels, sumps, and sanitary facilities used during construction shall be removed and the areas will be restored to original condition.

Alameda Isles Project 5-4 August 2024

(3) Sediment filters (silt fence) and turbidity barriers shall be installed in compliance with the plans prior to any excavation, structural removal, or placement of fill material and shall be maintained in effective condition at all locations until construction and vegetative measures are completed. The Contractor may need to supply additional erosion control methods as necessary.

(4) Temporary erosion control measures shall be removed after project completion only after the areas have been stabilized with vegetation or other erosion control methods.

(5) The Contractor shall comply with the NPDES Stormwater Permit for Construction

Sites.

(a) The Contractor shall have a completed schedule of construction and Stormwater

Pollution Prevention Plan (SWPPP) prior to submitting the Notice of Intent

(NOI)

(b) The Contractor is responsible for submitting the NOI and paying the application fee. The Contractor shall ensure that the SWPPP certification is completed by its workforce and subcontractors. The Contractor shall implement the SWPPP during construction.

(c) The Contractor shall submit the Notice of Termination (NOT) when finished.

(6) In Section 7 of this specification, Measurement and payment, Method 3 will apply.

Construction Specification 7 – Construction Surveys (210-VI-NEH, January 2009)

Alameda Isles Project 7-1 August 2024

Construction Specification 7—Construction Surveys

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 equipment shall be maintained in good working order and in proper adjustment at all times. Records of repairs, calibration 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 recommendations.

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 benchmarks 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 angular 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

Alameda Isles Project 7-2 August 2024

Sarasota County, FL measured horizontally and recorded to the nearest 0.1 foot. Side shots for interim construction stakes shall be taken with a hand level.

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

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 benchmarks for primary control, necessary to establish lines and grades needed for construction are shown on the drawings and have been located on the job site.

These baselines and benchmarks shall be used as the origin of all surveys, layouts, and measurements to establish construction lines and grades. The contractor shall take all necessary precautions to prevent the loss or damage of primary control points. Any stakes or control points lost or damaged by construction activity will be reestablished by the contractor or at contractor expense.

5. Construction surveys

Before work starts that requires contractor performed surveys, the contractor shall submit in writing for the engineer's review: the name, qualifications, and experience of the individuals to be assigned to the survey tasks.

Method 1—Contractor performed surveys shall include:

• checking and any supplemental or interim staking

• performing quantity surveys, measurements, and computations for progress payment

• other surveys as described in section 9 of this specification

Method 2—Contractor performed surveys shall consist of all work necessary for:

• establishing line and grade for all work

• setting slope stakes for all work

• checking and any supplemental or interim staking

• establishing final grade stakes

• performing quantity surveys, measurements, and computations for progress payment

• other surveys as described in section 9 of this specification

Method 3—Contractor performed surveys shall consist of all work necessary for:

• establishing line and grade for all work

• setting slope stakes for all work

• checking and any supplemental or interim staking

• establishing final grade stakes

• performing quantity surveys, measurements, and computations for progress payments

• performing original (initial) and final surveys for determinations of final quantities

• other surveys as described in section 9 of this specification

Alameda Isles Project 7-3 August 2024

Sarasota County, FL

6. Staking

The construction staking required for the item shall be completed before work on any item starts. Construction staking shall be completed as follows or as otherwise specified in section

9 of this specification:

Clearing and grubbing—The boundary of the area(s) to be cleared and grubbed shall be staked or flagged at a maximum interval of 200 feet, closer if needed, to clearly mark the limits of work. When contractor staking is the basis for determining the area for final payment, all boundary stakes will be reviewed by the engineer before start of this work item.

Excavation and fill—Slope stakes shall be placed at the intersection of the specified slopes and ground line. Slope stakes and the reference stakes for slopes shall be marked with the stationing, required cut or fill, slope ratio, and horizontal distance from the centerline or other control line. The minimum requirements for placing slope stakes are outlined in section 3, Quality of work.

Structures—Centerline and offset reference line stakes for location, alignment, and elevation shall be placed for all structures.

7. Records

All survey data shall be recorded in fully identified standard hard-bound engineering survey field notebooks with consecutively numbered pages. All field notes and printed data shall include the purpose or description of the work, the date the work was performed, weather data, sketches, and the personnel who performed and checked the work. Electronically generated survey data and computations shall be bound, page numbered, and cross referenced in a bound field notebook containing the index for all survey activities. All work shall follow recognized professional practice.

The construction survey records shall be available at all times during the progress of the work for examination and use by the engineer and when requested, copies shall be made available. The original field notebooks and other records shall be provided to and become the property of the owner before final payment and acceptance of all work.

Complete documentation of computations and supporting data for progress payments shall be submitted to the Engineer with each invoice for payment as specified in section 9 of the specification. When the contractor is required to conduct initial and final surveys as outlined in section 5, Construction Surveys, notes shall be provided as soon as possible after completion to the engineer for the purpose of determining final payment quantities.

8. Payment

Method 1—For items of work for which lump sum prices are established in the contract, payment is made as the work proceeds, after presentation of correct and accurate invoices by the contractor showing related costs and evidence of the charges of suppliers, subcontractors, and others for supplies furnished and work performed. Invoices for the total amount of the contract price will not be accepted until all surveys are complete and required documentation has been determined complete. If the total of such payments is less than the lump sum contract price for this item, the unpaid balance will be included in the final contract payment.

Payment of the lump sum contract price will constitute full compensation for completion of all work under the bid item.

Alameda Isles Project 7-4 August 2024

Sarasota County, FL

Method 2—For items of work for which lump sum prices are established in the contract, payment is made as the work proceeds with progress payment amounts determined as a percentage of the total work planned as projected from the contractor's approved construction schedule. Payment of the lump sum contract price will constitute full compensation for completion of all work under this bid item.

All Methods—Payment will not be provided under this item for the purchase price of materials or equipment having a residual value.

Compensation 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 item to which they are made subsidiary are identified in section 9 of this specification.

9. Items of work and construction details

Items of work to be performed in conformance with this specification and the construction details are:

a. Bid Item No. 4, Construction Surveys

(1) This item consists of all surveys necessary in accordance with Federal Acquisition

Regulation (FAR) 52.236-17 and this specification.

(2) Construction surveys shall include those described in Method 2 of section 5 of this specification, Construction surveys. Survey data shall be provided to Sarasota County within 14 calendar days after survey is completed.

(3) Proposed structures, ditch regrading, structures to be removed, and riprap limits shall be located and staked in the field by the Contractor.

(4) Contractor’s personnel who perform surveys shall be any person qualified by training and experience to do the work. Quantity surveys and as-builts are required prior to payment of Bid Items requiring quantities and survey verification that the item was constructed according to the drawings and specifications.

(5) The Contractor shall provide Sarasota County one unsealed copy (could be an electronic pdf file) of Construction as-builts with cross sections of the completed work verifying that the proposed structures and ditch regrading have been constructed to the neat lines and grades as shown on the drawings. As-built surveys shall be performed prior to re-routing water through the constructed structures. Upon approval of work, three Professional Land Surveyor sealed hard-copies of as-built survey drawings shall be provided to Sarasota County.

I. Mark as-built invert elevations and top width for the proposed weir, as well as top of ditch regrading and top of seawall elevations.

II. The maximum distance between cross sections shall be 100 feet. Individual shot elevations within each cross-section shall be taken at every change in topographical slope, or every 20 feet, whichever is shorter.

III. The drawings shall be submitted electronically in PDF and DWG format. The three (3) signed and sealed hard copies (24-inch by 36-inch plan size) shall be provided to Sarasota County. The as-builts shall be overlaid on the design plan sheets.

Alameda Isles Project 7-5 August 2024

(6) In section 8 of this specification, Payment, Method 2 will apply.

Construction Specification 8 – Mobilization and Demobilization (210-VI-NEH, May 2001)

Alameda Isles Project 8-1 August 2024

Construction Specification 8—Mobilization and Demobilization

The work consists of the mobilization and demobilization of the contractor's forces and equipment necessary for performing the work required under the contract. It does not include mobilization and demobilization for specific items of work for which payment is provided elsewhere in the contract. Mobilization will not be considered as work in fulfilling the contract requirements for commencement of work.

2. Equipment and material

Mobilization shall include all activities and associated costs for transportation of contractor's personnel, equipment, and operating supplies to the site; establishment of offices, buildings, and other necessary general facilities for the contractor's operations at the site; premiums paid for performance and payment bonds including coinsurance and reinsurance agreements as applicable; and other items specified in section 4 of this specification.

Demobilization shall include all activities and costs for transportation of personnel, equipment, and supplies not required or included in the contract from the site; including the disassembly, removal, and site cleanup of offices, buildings, and other facilities assembled on the site specifically for this contract.

This work includes mobilization and demobilization required by the contract at the time of award. If additional mobilization and demobilization activities and costs are required during the performance of the contract as a result of changed, deleted, or added items of work for which the contractor is entitled to an adjustment in contract price, compensation for such costs will be included in the price adjustment for the item or items of work changed or added.

3. Payment

Payment will be made as the work proceeds, after presentation of paid invoices or documentation of direct costs by the contractor showing specific mobilization and demobilization costs and supporting evidence of the charges of suppliers, subcontractors, and others. When the total of such payments is less than the lump sum contract price, the balance remaining will be included in the final contract payment. Payment of the lump sum contract price for mobilization and demobilization will constitute full compensation for completion of the work.

Payment will not be made under this item for the purchase costs of materials having a residual value, the purchase costs of materials to be incorporated in the project, or the purchase costs of operating supplies

Construction Specification 8 – Mobilization and Demobilization (210-VI-NEH, May 2001)

Alameda Isles Project 8-2 August 2024

4. Items of work and construction details

Items of work to be performed in conformance with this specification and the construction details are:

a. Bid Item No. 5, Mobilization and Demobilization

(1) This item shall consist of all work as described in section 1 of this specification, Scope, and additional permitting (as needed).

(2) All equipment shall be brought to the site in clean condition.

(3) Any maintenance needed for access and haul roads shall be included in this bid item.

Construction Specification 11 – Removal of Water (210-VI-NEH, May 2001)

Alameda Isles Project 11-1 August 2024

Construction Specification 11—Removal of Water

The work consists of the removal of surface water and ground water as necessary to perform the construction required by the contract in accordance with the specifications. It shall include: (1) constructing, installing, building, and maintaining all necessary temporary water containment facilities, channels, and diversions; (2) furnishing, installing, and operating all necessary pumps, piping, and other facilities and equipment; and (3) removing all such temporary works and equipment after their intended function is no longer required.

2. Diverting surface water

The contractor shall install, maintain, and operate all cofferdams, channels, flumes, sumps, and all other temporary diversion and protective works needed to divert streamflow and other surface water through or around the construction site. Control of surface water shall be continuous during the period that damage to construction work could occur. Unless otherwise specified and/or approved, the diversion outlet shall be into the same drainage way that the water would have reached before being diverted.

The contractor shall furnish the contracting officer, in writing, a proposed plan for diverting surface water before beginning any construction activities for which a diversion is required, unless waived in section 8 of this specification. Acceptance of this plan or the waiving of the plan requirement will not relieve the contractor of the responsibilities related to this activity during the process of completing the work as specified.

3. Dewatering the construction site

Foundations, cutoff trenches, and all other parts of the construction site shall be dewatered and kept free of standing water and muddy conditions as necessary for the proper execution of the work. The contractor shall furnish, install, operate, and maintain all drains, sumps, pumps, casings, well points, and all other equipment required to properly dewater the site as specified.

Dewatering systems that cause a loss of soil fines from the foundation areas will not be permitted.

The contractor shall furnish the contracting officer, in writing, a proposed plan for dewatering before commencing with any construction activity for which dewatering shall be required, unless waived in section 8 of this specification. Acceptance of this plan or the waiving of the plan requirement will not relieve the contractor of the responsibilities for completing the specified work.

4. Dewatering borrow areas

The contractor shall maintain all borrow areas free of surface water or otherwise provide for timely and effective removal of surface and subsurface water that accumulates within the borrow area, unless waived in section 8 of this specification. Borrow material shall be processed as necessary to achieve proper and uniform moisture content at the time of placement.

If pumping to dewater borrow areas is included as a bid item of work in the bid schedule, each pump discharge pipe shall be equipped with a water meter. The meter shall be such that the measured quantity of water is accurate within 3 percent of the true quantity. The contractor

Alameda Isles Project 11-2 August 2024

Sarasota County, FL shall provide necessary support to perform accuracy tests of the water meter when requested by the contracting officer.

5. Erosion and pollution control

Removal of water from the construction site, including the borrow areas, shall be accomplished so that erosion and the transporting of sediment and other pollutants are minimized. Dewatering activities shall be accomplished in a manner that the water table water quality is not altered. Pollution control activities shall not conflict with the requirements of

Construction Specification 5, Pollution Control, if it is a part of this contract.

6. Removal of temporary works

When temporary works are no longer needed, the contractor shall remove and return the area to a condition similar to that which existed before construction. Areas where temporary works were located shall be graded for sightly appearance with no obstruction to natural surface waterflows or the proper functioning and access to the works of improvement installed. The contractor shall exercise extreme care during the removal stages to minimize the loss of soil sediment and debris that was trapped during construction.

Pipes, casings, and any other material used to dewater the site shall be removed from temporary wells. The wells shall be filled to ground level with clean gravel or other suitable material approved by the contracting officer. The contractor shall exercise extreme care to prevent pollution of the ground water by these actions.

7. Measurement and payment

Method 1—Items of work listed in the bid schedule for removal of water, diverting surface water, and dewatering construction sites and borrow areas are paid for at the contract lump sum prices. Such payment will constitute full compensation for all labor, equipment, tools, and all other items necessary and incidental to the completion of the work.

Method 2—Items of work listed in the bid schedule for removal of water, diverting surface water, dewatering construction sites, and dewatering borrow areas are paid for at the contract lump sum prices. Such payment will constitute full compensation for furnishing, installing, operating, and maintaining the necessary trenches, drains, sumps, pumps, and piping and for all labor, equipment, tools, and all other items necessary and incidental to the completion of the work. The exception is that additional payment for pumping to dewater borrow areas and the removal of water will be made as described in the following paragraph.

If pumping to dewater borrow areas is a contract bid item, payment is made at the contract unit price, which shall be the price per 1,000 gallons shown in the bid schedule. Such payment will constitute full compensation for pumping only. Compensation for equipment and preparation and for other costs associated with pumping is included in the lump sum payment for removal of water or the lump sum payment for dewatering the borrow areas. Payment is made only for pumping that is necessary to dewater borrow areas that cannot be effectively drained by gravity or that must have the water table lowered to be usable as a suitable borrow source. Pumping for other purposes will not be included for payment under this item.

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 contract line item to which it is made subsidiary.

Alameda Isles Project 11-3 August 2024

Sarasota County, FL

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

Items of work to be performed in conformance with this specification and the construction details are:

a. Bid Item No. 7, Removal of Water

(1) This item shall consist of all works necessary and incidental to the removal of water in the work site as needed to install the works of improvement.

(2) The dewatering operation shall not create erosive conditions nor cause a condition of polluted water downstream from the work site.

(3) The Contractor shall follow all applicable permit requirements, as well as guidelines applicable to a General Permit by Rule pursuant to Rule 40E-2.061, Florida

Administrative Code (F.A.C.) which include the following:

• Maximum daily pumpage of less than 5 million gallons (MG) and a maximum total project pumpage of less than 100 MG over a one year period;

• All discharge will remain on the project site unless associated with an aquifer performance test;

• The dewatering depth will not be below -1.07 feet NAVD88 within 1,000 feet of saline water, except when dewatering water with a chloride concentration of greater than 1,000…