Seminole_BR_section-iv(a)_Supplemental_Technical_Specifications_R4.pdf

Supplemental Technical Specifications

BID DOCUMENTS

Seminole Boat Ramp Restoration

Prepared for the City of Clearwater

By

William K. Jones PE Registration # 39523 September 17, 2026 jpierson Ken-signature jpierson fl tranparent seal

Seminole St. Boat Ramp Restoration

City of Clearwater

Supplemental Technical Specifications

TS-01 MOBILIZATION AND DEMOBILIZATION (LS):

A. General: The Work specified in this section consists of the preparatory eƯorts and operations in mobilizing for beginning Work on the project, including, but not limited to, those operations necessary for the movement of personnel, equipment, supplies, and incidentals to the project site, and for the establishment of temporary oƯices, buildings, safety equipment and first-aid supplies, water supply, electric supply, sanitary facilities, transportation facilities, and other facilities as required by the Special Provisions and state and local laws and regulations. All costs for procurement of local building permits and providing the insurance required for the project shall be included within the bid item for Mobilization and Demobilization. Mobilization involves the moving of all equipment to the job site. It also includes arrangements for on-site storage and maintenance of said equipment, as well as access to the site for all equipment. Further, it includes construction access and staging, construction access and staging restoration, and Maintenance of TraƯic.

B. Existing floating dock: Contractor shall disconnect and remove/move the existing floating docks and stored for re attachment in the final phases of construction. Floating docks, can be removed and stored within approved upland staging areas or moored in the water in a manner that does not impede navigation access. Contractor is responsible for the maintenance of the floating docks.

C. Protective Matting: Existing conditions along the site access routes include bare ground, asphalt, finished concrete, and paver installations. The Contractor will be responsible for installing industrial composite ground matting atop all surfaces within the fenced staging and access area. Ground matting shall be underlaid with a soft fabric that is of suƯicient weight and quality to prevent scratching and marring of hardened or improved surfaces. The Contractor shall repair any pavement and/or marking damaged on any traveled roads and surfaces with the same material that existed prior, as determined by the Owner.

D. Maintenance of TraƯic: A temporary, 6-ft high, chain link fence with a locked gate shall be installed to restrict public access at all times and for all areas when equipment, materials, and construction activities are underway. The Contractor shall provide all necessary fencing, barricades, and any other devices needed for the safety of the public. The costs for all coordination eƯorts and MOT eƯorts associated with the project and public safety shall be included in Mobilization & Demobilization. Failure to comply with the terms in this section will result in the immediate cessation of all operations by the Contractor, until the Owner authorizes resumption.

E. Pre-Con Submittals: The Contractor and their Engineer shall provide an updated narrative and detailed schedule for the entire work project. The narrative shall expand upon that issued in the proposal (SP-02) and detail the specific engineering strategy and criteria that will be provided in the final drawings. The engineer shall provide concept drawings of the ramp design. The Contractor shall generate a detailed schedule that includes the engineering design and review process. The schedule shall be prepared specific to the approved construction strategy and use of the facility during construction.

F. Method of Measurement: The lump sum quantity for Mobilization and demobilization shall be the lump sum amount and shall include all items, devices, materials, labor, operations, and all work as described herein.

G. Basis of payment: The work and incidental costs specified herein shall be paid at the

Contract Lump Sum Price for the item of Mobilization and Demobilization (bid items A-001 & B-001). Mobilization shall be paid 60% upon commencement of work and 40% upon final completion and acceptance of work.

TS-02 ENVIRONMENTAL CONTROLS (LS):

A. General: The Work specified in this section consists of conforming to all federal, state, and local environmental regulations. This includes, but is not limited to maintaining State water quality standards, FDEP/FWC standard manatee protection measures, and all other environmental regulations. The Contractor shall furnish, install, maintain, and remove floating turbidity curtains around the active construction zones as detailed in the Project Plans.

B. Turbidity Curtains: must be Type II or Type III heavy-duty nylon-reinforced vinyl (minimum 18 to 22 oz) equipped with top load cables and bottom ballast chains. The barrier layout must adapt dynamically to tidal change (Flood/Ebb) while ensuring uninterrupted navigation channels remain open for active public boat lanes.

C. Method of Measurement: The lump sum quantity for Environmental Controls shall be the lump sum amount and shall include all items, devices, materials, labor, operations, and all Work as described herein. No separate volumetric or linear measurement will be made.

D. Basis of Payment: The work and incidental costs specified herein shall be paid at the Contract Lump Sum Price for bid items A-002 & B-002. Progress payments will be prorated monthly based on the overall percentage of physical project completion.

TS-03 FINAL RAMP DESIGN AND SHOP DRAWINGS (LS):

A. General: The work specified in this section includes all costs associated with preparation of an engineered final design for project elements, including but not limited to; ramp surface, ramp foundation, concrete mattress, connection details, construction methods, construction materials, concrete mix design, and integration with existing facilities.

Contractor shall provide complete signed and sealed engineering shop drawings and structural calculations for the precast concrete slab system (Alternate A - generalized 9' x 18' panels) or proposed concrete ramp (Alternate B – alternate design), post-tensioning joint connections, ramp foundation materials, articulated concrete mat, and gangway cap replacement.

Ramp slabs must be engineered to withstand a minimum uniform load of 300 PSF and an 8,500 lbs. concentrated load over 1 sq ft. Drawings must detail the post-tensioning assembly designed to join slabs for crack minimization.

All calculations must be submitted to the Owner for approval prior to fabrication. All drawings and calculations must be signed and sealed by a Professional Engineer with an active license registered in the State of Florida.

B. Method of Measurement: The lump sum quantity for Final Ramp Drawings & Shop Drawings shall be the lump sum amount and shall include all items, devices, materials, labor, operations, and all Work as described herein. No separate volumetric or linear measurement will be made.

C. Basis of Payment: The work and incidental costs specified herein shall be paid at the

Contract Lump Sum Price for bid items A-003 & B-003. Progress payments will be prorated monthly based on the overall percentage of physical project completion.

TS-04 SUBAQUEOUS SILT AND SEDIMENT REMOVAL (LS):

A. General: The Work specified in this section consists of the hydraulic extraction, containment, dewatering, and legal oƯ-site disposal of organic silts, fluidized muds, and fine sediments trapped at the lower toe, flanks, and directly beneath the structural footprint of the existing boat ramp slabs. Silt removal must be fully completed and accepted by the Engineer prior to the commencement of any TS-05 and TS-07 (Final Fill and Grading operations). For the purpose of this specification, silts and fines to be removed are as defined by the Universal Soil Classification System (USCS), those passing through a standard No. 200 (<0.075 mm).

B. Performance Standards

1. Extraction Methods: Silt and fine sediment removal shall be performed utilizing suction apparatus or a submersible slurry pump system capable of capturing low-density subaqueous fines without dispersing material into the surrounding water column.

2. Dewatering & Filtration Constraints: Under no circumstances shall unfiltered, turbid, or sediment-laden effluent water be discharged back into Clearwater Bay. The Contractor shall utilize one of the two following containment pathways:

i. Direct Suction: Pump sediment and water directly into sealed vacuum truck tanks for immediate transit to a licensed off-site disposal facility.

ii. On-Site Geo-Bag Filtration: Pump the subaqueous slurry directly into heavy-duty geotextile dewatering bags (Geo-Bags) positioned entirely within an approved upland laydown areas. The Geo-Bag layout must feature an impermeable plastic liner underlayment and a secondary straw-bale, wattle, or gravel-filter berm system. This system must filter out all suspended solids, allowing only clear, non-turbid, compliant water to sheet-flow down the ramp.

3. Excavation Target: Silt removal must continue until all soft, organic, fluid fines are completely extracted, exposing the stable, consolidated subgrade beneath the ramp footprint. The work will be considered complete when a standard 16-LB ponar sampling device yields less than 10% return by volume of silts, or a standard 2”push-probe confirms less than two-inches of silt cover atop the consolidated layer. The acceptance demonstration shall be conducted at twenty-five foot (25 ft) on center spacing.

C. Disposal: Decanted solid sediment cakes, saturated silts, and used geotextile materials shall be hauled away and disposed of at an approved upland landfill. The Contractor is solely responsible for all regulatory testing, transport logistics, and disposal tipping fees.

D. Method of Measurement: This item will be measured on a Lump Sum (LS) basis per operational construction phase for bid item A-005 or as a single unified Lump Sum under bid item B-005.

E. Basis of Payment: Paid at the Contract Lump Sum price for Subaqueous Silt and Sediment

Removal. Progress draws shall not be certified by the Engineer until:

1. A post-vacuuming underwater visual inspection or probe verification confirms all fine silts have been successfully removed down to the hard subgrade.

2. All accumulated solid spoils are successfully dewatered, contained, or hauled oƯ-site.

TS-05 INITIAL GRADING (CY):

A. General: The project includes executing dredging, placement, and grading of existing sediment oƯshore of Ramps 1, 2, 3, and 4 prior to commencement of existing concrete ramp demolition, as outlined in the Project Plans. The intent of the initial grading phase of work is to replace sandy sediments which have been washed away from the toe of existing ramps. Approximate limits of excavation for material are provided in the project plans, which may require adjustment during construction.

B. Material Characterization: The material to be removed from within the identified locations is comprised of shoaled material which has accumulated since initial site grading. Material within these locations is expected to include but not be limited to sand, silty sand, silt, clayey silt, and debris. Grading of existing consolidated sediments, including rock, is not permitted or required.

Due to the proximity of the dredge areas to the boat ramp and docks, debris is likely to be encountered. Debris removed from the dredged area shall be removed from the water and disposed of appropriately. Disposal shall be the responsibility of the Contractor and disposal shall occur at an approved facility.

C. EXCAVATION & GRADING – The limits of excavation for this project are described in the project plans. The final slope of graded seafloor shall be as-indicated in the project plans.

An approximate volume of 330 cy of earthen fill is anticipated to achieve the required initial grading template. The total volume includes 80 cy of cut and reposition and 250 cy of imported fill. All material cut and placement activities shall be completed with the use of a mechanical dredge or excavator.

1. Borrow Cut: The oƯshore slope of the borrow cut shall be no steeper than one-foot vertical for every four-feet horizontal (1V:4H). Approximately 80 cy of material is available for excavation and re-use compared to the July 2025 hydrographic survey.

2. Imported Fill: Approximately 250 cy of earthen fill material is estimated to be required to be imported from and approved oƯsite source to achieve the required initial fill template. Fill material shall be designed and proposed by the CDB team and approved by the Owner prior to purchase or delivery.

3. Initial Ramp Grading: The graded slope within the footprint of the proposed ramp shall be graded to a slope of one-foot vertical for every seven-feet horizontal (1V:7H). SuƯicient space for placement of a minimum of one-foot of gravel base plus eight-inches of ramp slab thickness shall be provided during initial grading (minimum twenty-inch relief). An approximate five-foot horizontal oƯset from the toe of the existing ramp is anticipated during the initial grading phase to allow for eƯective ramp removal during demolition.

4. Initial Toe Grading: The portion of fill which lies between the toe of the proposed ramp and toe of the oƯshore 1V:4H borrow cut shall be graded to a slope no steeper than one-foot vertical for every fifteen-feet horizontal (1V:15H). SuƯicient space for placement of a minimum of two-feet of gravel base plus four-inches of concrete mattress thickness shall be provided during initial grading (minimum sixteen-inch relief).

D. ACCEPTANCE – Work areas will be accepted based on third-party surveys arranged by the

Contractor as described in these specifications. Acceptance will be based on the post-grading soundings, as compared to the design template. The target design grade is detailed in the project plans. An allowable tolerance of one-half foot (0.5 ft) will be allowed for acceptance during initial grading.

The City reserves the right to accept a work area which does not meet the acceptance criteria listed above. Relaxation of acceptance criteria for a work area shall not establish a new standard of acceptance for outstanding work items.

1. Survey: Surveys used for layouts, acceptance, and payment purposes must be conducted by a third-party PSM under contract to the Contractor. The third-party surveyor must collect pre- and post-construction topographic surveys for the purposes of acceptance and payment. Survey data must be collected along twenty-foot stations with elevations taken at intervals not to exceed five-feet range, and at all breaks in grade, from the baseline to twenty feet beyond the limit of excavation.

E. Method of Measurement: Measured by the volume in Cubic Yards (CY) of fill placed, calculated via the average end area method, between pre-construction and post-fill topographic surveys.

F. Basis of Payment: Paid at the Contract Unit Price per Cubic Yard for bid items A-004 and B-

004.

TS-06 RAMP DEMOLITION (LS)

A. General: The work specified in this section includes selective demolition, fracturing, removal, and disposal of the designated concrete boat ramp slabs as depicted in the Project Plans. The work in this section also includes temporary removal, preservation, and staging/anchoring of existing floating docks out of the active construction zones to facilitate subgrade access. All pilings supporting floating docks shall be removed and disposed. All costs associated with accessing, removing, crushing, disposing, and transporting of existing ramp debris and associated elements are to be included in the contract price for this item.

B. Performance Standards: The Contractor must execute clean saw-cuts along the margins of the existing dry ramp slab, concrete gangways, and upland elements to prevent structural fracturing of elements marked to remain. Slabs must be broken up carefully to expose and preserve the embedded rebar dowels extending into new sections. Concrete demolished under this section may, at the contractor’s discretion, be crushed onsite to a minimum 1/2”-inch diameter and can be used as deep subgrade fill, provided it is entirely stripped of structural rebar and fines. Requirements contained to TS-08 (Gravel and Rock Fill) will apply to crushed concrete materials.

C. Disposal: All demolished materials shall be disposed of at an oƯsite facility in accordance with standards set forth in the Project Documents. No additional payment will be provided for transporting, tipping fees, or processing costs for disposal of demolished materials produced as a result of ramp demolition.

D. Method of Measurement: This item will be measured on a Lump Sum (LS) basis per operational phase for the associated line item.

E. Basis of Payment: Paid at the Contract Lump Sum price per phase upon total removal and verified cleanup of the designated demolition zone under bid items A-006, A-013, & B-006.

TS-07 FINAL EARTHEN GRADING (LS)

A. General: The Work specified in this section consists of final subgrade leveling of slopes along the fill beds immediately following ramp demolition and prior to gravel and stone placement.

B. Performance Standards: Subgrade preparation must establish final slopes matching the explicit design configurations shown on the plans: a 7:1 slope profile across the primary ramp footprint, transitioning to a 15:1 slope profile across the lower toe mat foundation, and terminating at a 4:1 slope to tie into existing natural ground. The work is to be accomplished utilizing clean aggregate and fill as defined by the engineer. All new subgrade fill shall meet the criteria of TS-08 and suitable to meet slope criteria and provide a smooth continuous base for the boat ramp slabs. All final fills and subgrades must be graded to cleanly match the edge lines of the 2025 upland concrete pavement to remain, allowing adequate space to accommodate the target gravel base and rock fill thickness. An allowable vertical tolerance of ±0.25 feet is established for acceptance purposes.

C. Method of Measurement: The final fill and grading operations shall be measured as a single Lump Sum (LS) quantity per construction phase, covering all mechanical spreading, layouts, survey, and labor.

D. Basis of Payment: The Work specified herein shall be paid at the Contract Lump Sum Price for Final Fill and Grading for the designated phase (bid items A-007, A-014, & B-007). Payment will be released upon third-party survey confirmation that the subgrade slopes conform to the 7:1, 15:1, and 4:1 design templates within a tolerance of ±0.25 feet.

TS-08 GRAVEL AND ROCK FILL (LS)

A. General: The Work specified in this section includes the procurement, certified delivery, placement, and final grading of the aggregate leveling layers.

B. Materials: The minimum specific gravity of the stone shall be 2.35 as determined by ASTM D6473. Quarry certification of the delivered stone’s specific gravity is required. All stone shall be available for inspection by the Owner prior to placement. The Owner reserves the right to refuse payment for stone delivered to the site which does not meet the specified requirements, and the Contractor shall remove the unacceptable stone from the site at no additional cost to the Owner.

1. 0.25-Inch Dia. Gravel Base (Bid Items A-008 & A-015 / B-008): Clean, uniformly graded fine gravel aggregate or crushed concrete with a nominal diameter of 0.25 inches and free from fines (will not pass a #10 sieve). Must be entirely free of loam, clay, organic matter, fine sand particles, and other debris. This material shall be placed in a continuous 1-foot thick layer to serve as the precision leveling course to support the precast concrete slabs.

2. 1-Inch to 4-Inch Dia. Rock Fill (Bid Items A-009 & A-016 / B-009): Hard, durable, angular stone free from fractures, seams, or chemical imperfections. Individual stones must pass a gradation screening ensuring a minimum size of 1 inch and a maximum size of 4 inches. This rock shall be placed in a stable 2-foot thick layer to serve as the foundation ballast directly beneath the articulated concrete scour mats and floating dock gangways.

C. Performance Standards: Dropping aggregates from unapproved heights into subaqueous zones is prohibited to prevent material segregation and subgrade displacement. Aggregates must be placed smoothly via mechanical means and leveled to the design lines. Data submittal from a third-party PSM is required for acceptance of the work. Demonstration by survey that the design lines and grades, along with agreement by the Owner that the intent of design has been met will be determining factors for substantial completion. A allowable vertical tolerance of ±0.10 feet is established for acceptance purposes.

The contractor is to provide original copies of all load tickets to substantiate quantity calculations. On-site crushed concrete may be used once approved by the Owner.

Cross sections developed from data collected by a Florida-registered PSM must show rocks have been placed within the design template, to the satisfaction of the Owner, prior to being eligible for payment.

D. Method of Measurement: The lump sum quantity for gravel and rock fill shall be the lump sum amount and shall include all items, devices, materials, labor, operations, and all work as described herein. Quantity calculations for rock and gravel fill are for informational purposes only and no separate volumetric or linear measurement will be made.

E. Basis of Payment: Lump Sum. Payment for this line item (bid items A-008, A-009, A- 015, A-016, B-008, & B-009) will be made for costs associated with the procurement, transportation, handling, and installation of stone underlayment as described in the Contract drawings and herein. Percent complete by estimated volume may be used for partial payment calculations.

TS-09 ARTICULATED MATT (SF):

A. General: The Work under this section consists of furnishing, fabricating, transporting, and installing flexible, 4-inch thick articulated concrete block armor mattresses along the lower toes, beneath floating gangways, and between the concrete ramp sections to prevent subaqueous mud and sand scour. The Contractor shall provide detailed manufacturer shop drawings and anchoring calculations for approval prior to mat procurement.

B. Material and Performance Standards: Mats must feature dense, machine-molded concrete blocks linked securely by high-strength, corrosion resistant cabling. Individual blocks within the matrix must be 4 inches thick. The mat system must be configured and placed over the prepared 1-to-4-inch rock base so that the finished top-of-mat profile at the toe of boat ramp slope aligns exactly with an elevation of -7.0 feet NAVD88, +/- 0.10 ft, sloping down at 15’H:1’V. Mats running alongside the boat ramp slabs shall conform to the slopes of the ramp. Mats must abut tightly against, and be aƯixed to, the slab ramp edges to prevent under-ramp erosion.

C. Method of Measurement: This item will be measured by the total plan-view surface area in Square Feet (SF) of articulated concrete matting actually placed and secured within the limits of construction.

D. Basis of Payment: Paid at the Contract Unit Price per Square Feet (SF) for Articulated Mat installation under bid items A-011, A-018, & B-011. Payment requires signed verification from a third-party Professional Surveyor and Mapper (PSM) confirming that the horizontal boundaries match layout sheets and the top-of-mat elevations.

TS-10 RAMP SLABS (LS):

A. General: The Work specified in this section includes the engineering, fabrication, transport, positioning, and post-tensioned assembly of the 8-inch thick (or as prescribed by contractor’s engineer and approved by the Owner) concrete boat ramp slab system over the prepared aggregate leveling course base. The Contractor shall provide detailed manufacturer shop drawings detailing post-tensioning methodology, materials, and concrete mix for approval prior to slab procurement.

B. Material and Performance Standards:

1. Concrete Mix Design: All precast slabs must be cast using a high-performance marine-grade concrete mix with a minimum 28-day compressive strength of 4,000 PSI, a maximum water-to-cement (W/C) ratio of 0.50, and a slump range between 3 inches and 5 inches. Mix design shall use admixtures suitable for submersion in a marine environment.

2. Post-Tensioning System: Precast panels must incorporate internal post-tensioning ducts matching approved shop drawings. Post-tensioning tendons must be stressed to the precise tensioning loads required to withstand a 300 PSF uniform live load and an 8,500 lb concentrated load applied over 1 square foot. After stressing, ducts must be completely pressure-grouted with an approved non-shrink marine grout.

B. Anti-Slip Geometric Finish: The driving surface of all active ramp slabs must be struck oƯ and finished with an integrated V-groove configuration to an elevation not shallower than -

5.0 ft NAVD88. Grooves shall be as-described in the project plans, or as otherwise approved by the Owner.

C. Method of Measurement: This item will be measured on a Lump Sum (LS) basis per completed construction phase.

D. Basis of Payment: Paid at the Contract Lump Sum price under bid items A-010, A-017, and

B-010. Progress draws will only be certified following successful alignment, tendon stressing, and a visual surface inspection of the V-groove profiling by the Owner.

TS-11 GUIDE PILINGS AND FLOATING DOCK REPLACEMENT (EA):

A. General: The Work specified in this section includes driving, retrofitting, sleeves-fitting, and concrete-grouting the floating dock structural guide pilings as shown in the project plans.

B. Material and Performance Standards:

1. Timber Guide Piles: New 10” pressure treated timber piles shall be driven to a minimum embedment depth of 8 feet into the native subgrade below the subaqueous mudline and extend to an elevation of +10’ ft NAVD88. Piles shall be 10-inch diameter, pressure treated for marine use in accordance with AWPA Standard U1, Use Category UC5C for Southern Yellow Pine with a minimum CCA retention level of 2.5 lbs/ft³ (pcf). The piling shall be installed plumb. Vinyl piling wraps, with a minimum thickness of 1.50 mm (60 mil), shall be installed from the mudline to an elevation of +3.0 ft NAVD88. Vinyl wraps are to be secured with 316 stainless steel fasteners spaced not more than two (2) inches apart along the material vertical seams. Conical pile caps shall be installed on all timber pilings with a minimum of four 316 stainless steel fasteners.

2. Steel Piling & PVC Sleeves: 6” ф Schedule 40 PVC pipe shall be jetted or otherwise established to a depth of 10’ below the boatramp grade at the point of construction.

Structural guide assemblies must utilize 4-inch diameter galvanized steel piles driven to a minimum embedment depth of 6 feet inside of the outer 6-inch diameter Schedule 40 PVC sleeve. The space between the steel and PVC shall be completely filled with non-shrink marine grout. The internal steel core must be filled with 4,000 PSI concrete and finished with a weather-shedding concrete cap.

3. Floating Dock & Gangway Reinstallation: Following the installation of the piles and concrete ramp slabs, the Contractor shall move the staged floating docks back into position. Docks must be securely attached to the new, gangways, timber and steel guide piles using the existing pile guide brackets, rollers, and hardware.

4. Gangway Alignment: Aluminum gangways must be re-anchored to the newly replaced 10-inch concrete caps. Connection hinges and rollers must align to provide unhindered, ADA-compliant travel throughout the full tidal range. Damaged anchoring equipment shall be replaced with new connectors.

C. Method of Measurement: This item will be measured on a unit price basis per Each (EA) fully completed piling assembly. A completed piling assembly includes timber and steel guide piles, and a fully-aƯixed floating gangway to the City’s satisfaction.

D. Basis of Payment: Paid at the Contract Unit Price per each pile and dock assembly installed under bid items A-012, A-019, & B-012. Payment requires verified field logs confirming the 6 and 8-foot minimum structural embedment depth and a post-pour inspection verifying uniform grout consolidation within the PVC sleeve.

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