Ftm32TechSpecs3-28-24_(1).pdf

Hans Wilson & Associates, Inc.

City of Fort Myers, FL

Legacy Island Development Technical Specifications

TECHNICAL SPECIFICATIONS

for

City of Fort Myers, FL Legacy Island Development at Legacy Island, Ft. Myers, FL

March 2024

TS-1.0 Mobilization and Demobilization TS-2.0 Riprap / Revetment Materials and Construction TS-3.0 Living Shoreline Construction TS-4.0 Mangrove Plantings TS-5.0 Dock and Observation Pier Construction, Materials, and Testing TS-6.0 Tree Removal and Disposal TS-7.0 Foot Trails TS-8.0 Gazebo Construction TS-9.0 Beach Area Fill (Ortona Sand) TS-10.0 Filter Fabric Materials and Construction TS-11.0 Signs TS-12.0 Listed Species Monitoring TS-13.0 Turbidity Controls and Monitoring TS-14.0 Permits and Authorizations TS-15.0 Confirmation of Work

TS-1.0 Mobilization and Demobilization

TS-1.1 The one-time mobilization will include all activities and costs for transportation of personnel, equipment, and supplies/materials to the site, establishment of offices and other necessary facilities for the CONTRACTOR’S operations at the site. Mobilization alone will not be considered as Work in fulfilling the Contract requirement for commencement of Work. Mobilization will be paid at 60% of this line item.

TS-1.2 The one-time demobilization will include all activities and costs for transportation of personnel, equipment, and supplies/materials not used in the Contract, including the disassembly, removal, and site cleanup of any offices or other facilities assembled on the site for the construction. Upon demobilization, the CONTRACTOR will restore all access areas to the same condition as prior to mobilization. Demobilization will be paid at 40% of this line item.

TS-1.3 This line item includes mobilization and demobilization required by the project at the time of award. If additional mobilization and demobilization is required during the performance of the Work due to changed, deleted, or added items of Work, compensation for such costs will be awarded to the CONTRACTOR by the OWNER.

Additional mobilization and demobilization resulting from an error on the CONTRACTOR’S part will be solely the responsibility of the CONTRACTOR.

Legacy Island Development Technical Specifications

TS-1.4 All equipment and materials will be mobilized and demobilized in accordance with all local, state, and federal laws related to transportation and safety.

TS-2.0 Riprap / Revetment Materials and Construction

TS-2.1 The revetment will be placed 10’ waterward and 10’ landward of the mean high-water line located at the time of construction. The total length of revetment is approximately 824 linear feet, and the estimated volume of riprap is 1,500 cubic yards;

however, the finished profile as shown in the construction drawings is required. Filter fabric will be installed on existing grade and riprap will then be placed on the filter fabric.

The filter fabric will cover the entire footprint of the revetment, beginning at a top and extending out to the toe of the proposed revetment. Fabric will be tucked or embedded a minimum of 12” at the toe and crest.

TS-2.2 Riprap will be hard, sound, limerock or other similar materials obtained from local sources, free of organics or other impurities. Riprap material will be washed free of sand, dirt, or other deleterious substances. Riprap will be angular, and the greatest dimension of any piece will not exceed twice the least dimension. The waterward toe for the full length of the revetment will be constructed from riprap a minimum of 36” in diameter.

There will be a minimum of 30% of the stones over 36” in diameter, 50% will be a minimum of 24” in diameter, and the remaining 20% will average not less than 1’ in diameter (to be used as a top dressing to chink and secure riprap in place).

TS-2.3 The work includes the complete removal of all non-native vegetation within the revetment limits except for select vegetation, such as trees designated to remain. This will be coordinated with the ENGINEER prior to the clearing of the shoreline.

TS-2.4 Revetment construction will be by methods determined by the CONTRACTOR to achieve full thickness of the material with minimal voids, ensure the riprap is interlocked, and to avoid damage or displacement of the stone. Techniques to stabilize revetment include, but are not limited to, placement and arrangement by machine, by hand, or by levers (mechanical or hand operated) to place and rotate the riprap rocks to a firm fitment. The CONTRACTOR will be responsible for the restoration of all impacts associated with the construction. The CONTRACTOR will take care in placing riprap around any vegetation that is to remain.

TS-2.5 The ENGINEER and OWNER reserve the right to reject any riprap that does not comply with the specifications, at no expense to the OWNER.

TS-3.0 Living Shoreline Construction

Reef Balls: Bay Ball Reef Ball by Reef Balls™ will be manufactured by Reef

Innovations, 1126 Central Avenue, Sarasota, FL 34236, or ENGINEER approved equivalent. Typical design will be amended to include a solid bottom and sides up to 6” above bottom. This will allow for the designed 6” minimum sand filled bottom.

Legacy Island Development Technical Specifications

RCP Planters: Variable diameter Reinforced Concrete Pipe (RCP), Rim of pipe set 2’ above MHW will be functional and have no reinforcement visible. Estimated quantities of RCP are shown, based off of a 4’ diameter pipe. Due to expected variance in pipe size, this count may change, however, the CONTRACTOR will be responsible for the finished profile/arch length, as shown in the plan view.

TS-3.1 Dock Living Shoreline – A broken arch of (~15) RCP planters will be installed at the access to the Docking Facility, to create a protected beach area. They will be embedded into the river bottom a minimum of 1.5’ and will be filled with sand to 1’ above the mean high-water line to create habitat for aquatic vegetation. Waterward of this row of RCP will be a row of (20) Bay Ball Reef Balls™ (3’ diameter and 2’ tall) with 6”-12” of sand fill in bottom. The layout and placement are shown in the plan and detail drawings.

TS-3.2 Paddle Craft Living Shoreline – A broken arch of (~18) RCP planters will be installed in front of the Paddle Craft Shoreline, to create a protected beach area. They will be embedded into the river bottom a minimum of 1.5’ and will be filled with sand to 1’ above the mean high-water line to create habitat for aquatic vegetation. Waterward of this row of RCP shall be a row of (28) Bay Ball Reef Balls™ (3’ diameter and 2’ tall) with 6”-12” of sand fill in bottom. The layout and placement are shown in the plan and detail drawings.

TS-3.3 CONTRACTOR will install the RCP with no more than 8” between each pipe and the overall alignment will have a smooth curve. There will be a 10’ wide overlapping gap between the two arches to allow access for paddle craft access to the protected area(s).

TS-3.4 Mangrove planters will be created using a mix of Reinforced Concrete Pipe (RCP) placed on end and driven into the bottom so that the top edge of the RCP is set at an elevation specified in the construction drawings. All RCP will be placed female end up and positioned so that any writing, paint marks, or visible defects are as hidden as possible. The RCP will be filled with clean sand to within 18” of the top. The remaining fill will be a mix of topsoil with organics to facilitate growth of the vegetation planted in the top. The bottom of the RCP will be embedded in the substrate to provide a solid, stable base. The RCP will generally be installed so the top is at elevation +2’ above the mean high-water line unless otherwise specified in the construction drawings. Settlement may occur and CONTRACTOR is responsible for refilling prior to planting. The RCP will be provided by the OWNER.

TS-4.0 Mangrove Plantings

TS-4.1 Salt Acclimation of Nursery Plants - Acclimation to saltwater conditions is a requirement to ensure a successful transition from plant nursery to installation location.

All specified mangrove plants will be fully acclimated for salinity prior to planting. The target salinity will be the known established on-site salinity as obtained and provided by the ENGINEER (provided in parts per thousand (ppt)). Salinity acclimation will occur for a minimum of sixty (60) days prior to planting.

Legacy Island Development Technical Specifications

TS-4.2 Plant Warranty - Installed plants must meet a ninety percent (90%) survival rate for 180 days after final approved initial inspection by ENGINEER. A 180-day inspection will be completed by ENGINEER and if plant survival falls under ninety percent, the CONTRACTOR will reinstall plants to bring the total number of live plants to meet the ninety percent (90%) of the total plants installed.

TS-4.3 Work includes furnishing all labor, supplies, equipment, transportation, and materials and performing all operations in connection with the installation of plants.

TS-4.4 All Plants must be installed with a soil incorporation of a six-month labeled controlled release fertilizer.

TS-4.5 All mangroves will be:

Area Common name

Botanical name Size Quantity Install elevation

Riprap Red Mangrove

Rhizophora mangle 1 gal 272 MHW to +1’

MHW

RCP Red Mangrove

Rhizophora mangle 1 gal 290

MHW to +1’

MHW

TS-5.0 Dock and Observation Pier Construction, Materials, and Testing

The CONTRACTOR will be required to submit material certificates for all materials.

Design Live Load 100 psf

Decking 2" x 6" composite MoistureSheild Vantage with ½” spacing.

Stringers 3" x 8", #1 Southern Yellow Pine (Dimensional), 0.6pcf CCA treated on 18” centers max.

Cap Boards Double 3" x 10", #2 Southern Yellow Pine (Rough Cut), 0.6pcf

CCA treated.

Dock Piling 10" butt, minimum 10' embedment, 2.5pcf CCA treated with varying lengths.

Mooring Piling 12" butt, minimum 10' embedment, 2.5pcf CCA treated with varying lengths.

Cross Bracing 2” x 8” Structural Plastic on alternating bents on both accesses and at the end of each finger dock per the construction plans.

Legacy Island Development Technical Specifications

TS-5.1 Decking - Decking material will be full thickness 2”x6” MoistureSheild Vantage composite, or ENGINEER approved equal, with color to be selected by the OWNER. All decking will be installed with no greater than ½” gap between boards, fastened with 3” square drive stainless steel decking screws (2) per stringer per board.

TS-5.2 Stringers - Stringers will be #1 Southern Yellow Pine treated with Chromium Copper Arsenate (CCA) with a minimum retention of 0.6 pcf. Lumber should be surfaced to allow for even placement of decking. If rough cut lumber is used, it will be planned to be level across the width of the dock and is to be checked by use of a straight edge with the ENGINEER present prior to fastening the decking. The outboard stringers will be scabbed not less than 18" per stringer end. The scab will be nailed to the stringer, with not less than (4) 30d stainless steel ring shanked nails per stringer end. The scab and stringer will be bolted with 5/8” diameter through bolts, washers, and nuts to proximate piles. The intermediate stringers may be lapped not less than 18", or may be scabbed not less than 18", per stringer end. Lapped stringers will be attached with not less than

(4) 30d stainless steel ring shanked nails. One 90-degree stainless steel twist strap will be installed on each stringer, one per pile bent.

TS-5.3 Cap Boards- Cap Boards will be #2 Southern Yellow Pine treated with Chromium Copper Arsenate (CCA) with a minimum retention of 0.6 pcf. Cap Boards will be double bolted with 5/8” diameter through bolts, washers, and nuts. Lumber may be rough-cut to actual dimensions or finished dimensional lumber. Cap board ends will be chamfered at a 45° angle and will not extend past the outer alignment of the pilings or the decking material whichever is greater.

TS-5.4 Dock and Mooring Piling - All wood pilings will be of Southern Yellow Pine meeting ASTM D25 specifications. All wood pilings will be treated with Chromated Copper Arsenate (CCA) with a minimum retention of 2.5 pcf. All piling will be clearly and permanently marked with a brand, or a manufacturer’s certification which contains the following information: suppliers’ brand, plant designation, month and year of treatment, species of timber, length and class of pile, type and retention of preservative used for treatment. All pilings will be driven or jetted into the bottom. If driven, care must be taken not to damage the piles. All piling will have a minimum pile tip penetration of 40% of the overall pile length. The top of all piles will be driven, jetted, or cut off at grade in such a manner that all finished pile head surfaces will be on a horizontal plane unless noted otherwise. The CONTRACTOR will provide evidence, such as a report or other documentation from a geotechnical/engineering testing firm, that the pilings meet the required bearing capacity of 2 tons per piling.

TS-5.5 Handrailing - All handrailing components will have a top elevation 42” up from decking and will be constructed of #1 dense Southern Yellow Pine, treated with a non- CCA treatment with a minimum retention of 0.4 pcf. The posts will be 4"x4" and will be on 5' centers. The railing posts will be double bolted to the outboard stringers with 5/8” carriage bolts, washers, and nuts. Where stringers are not flush with edge of decking a block of stringer lumber 6” in length will be used as a spacer between the proximate stringer and the post. The 2"x6" side rails will be single bolted to the pilings with 1/2"

Legacy Island Development Technical Specifications carriage bolts, washers, and nuts. The 2"x 6" top rail will be composite, of the same lumber as the decking, and fastened to the top side rail using 3" square drive stainless steel decking screws at 12" on center minimum. Top rails and side rails will be installed using lap joints positioned such that they occur at rail posts only. All bolts will be of an appropriate length for the application.

TS-5.5 Piling Caps – All exposed piling tops shall be fitted with conical PVC/HDPE piling caps. Piling caps shall be black in color and sized to within 1/2” of piling diameter. Piling caps to be held in place with a minimum of 8 appropriately sized ring shank stainless steel fasteners.

TS-5.6 HDPE Pile Wrap - The Contractor will install High Density Polyethylene (HDPE) pile wrap on all CCA treated piling from 2' below the mud line to 1' above the MHW line.

The pile wrap will be commercial grade, minimum 30-mil thickness with a minimum of an 8" overlap. Before installing wrap, each pile will be cleaned, removing all foreign matter for the entire length to be protected. This includes all existing surface projections (i.e., nails, bolts, large splinters) and any other surface condition that would penetrate or damage the wrap. The pile wrap will be secured with stainless steel ring-shanked nails or stainless steel 1-1/4” roofing nails on 2” centers along the seam and around the upper and lower rims.

TS-5.7 Cross Bracing - Cross bracing will be Fiber Force Structural Lumber® as produced by Bedford Technology®, LLC, 2424 Armour Road, Worthington, MN 56187 (www.plasticboards.com), or ENGINEER’S approved equal. Cross bracing will be installed as shown on the construction drawings. Cross bracing will be fastened at the top and bottom with single 5/8" diameter through bolts, washers, and nuts. Cross bracing may be placed on one side of the pilings to avoid the need for blocking and bolted with a single 5/8" diameter through bolt, washers, and nuts at the crossing location.

TS-5.8 Hardware - All bolts, nuts, washers, lag screws, screws, trim nails, straps, brackets, and miscellaneous hardware will be 304/305 stainless steel. All deck and handrailing fasteners will be 316 stainless steel, without exception. All through bolts will have washers on both sides of the lumber, bearing evenly on all surfaces. All bolts will be tightened to recommended torque values. All exterior bolts that may protrude into the navigational channel will be counter sunk to avoid damage to boat hulls. All bolts will meet ASTM A-325 standards for bolt type, nuts, and washers. They will conform to the requirements of ASTM A-320 (stainless steel).

Legacy Island Development

TS-6.0 Tree Removal and Disposal

TS-6.1 The CONTRACTOR will cut and set aside all trunks and branches over 6” in diameter of trees not marked to remain within 10’, landward and waterward, of the Mean High-Water Line (MHWL). This removal will be to allow the placement of a 20’ wide riprap shoreline revetment. The MHWL will be staked by the ENGINEER. The ENGINEER will mark all vegetation that are proposed to remain within the proposed 20’ wide revetement alignment.

TS-6.2 The CONTRACTOR will process the downed trees into sections that will be placed along the proposed foot trails. Trunk and branch sections over 6” diameter, will be cut into sections 10-15 feet long and have all limbs/ smaller branches removed. The downing and processing of the trees into sections will be paid for under TS-6.0 Tree Removal and Disposal. The placement of the fully processed sections will be paid for under TS-7.0 Foot Trails.

TS-7.0 Foot Trails

TS-7.1 The CONTRACTOR will install a 6’ wide foot trail composed of crushed shell laid a minimum of 4” thick directly on existing grade. The foot trail will be installed per the alignment shown in the project plan set.

TS-7.2 The CONTRACTOR will line the outside edge of trails with trunks and branches, 6” diameter or greater, set aside from the trees that were downed during the clearing.

The trunks and branches will be cut into manageable sections during the clearing process and staged for future placement along the trails. The downing and processing of the trees into sections will be paid for under TS-6.0 Tree Removal and Disposal. The placement of the fully processed sections will be paid for under TS-7.0 Foot Trails.

TS-8.0 Gazebo Construction

TS-8.1 The CONTRACTOR will install eight (8) pilings for each of the two (2) gazebos shown in the project plans. As indicated on the plan detail, gazebo piles will be installed such that the top of piles are a minimum of 8.5’ above the existing grade. The piles shall be used as supports for the fixed roof of the gazebo.

TS-8.2 The CONTRACTOR will grade level then place and compact crushed shell to create a stabilized area under the gazebo. The crushed shell will be placed 6” deep under the entire roof structure, tapering to existing grade from the roofline moving away from the gazebo at a maximum 12:1 grade.

TS-8.2 The fixed roof for the gazebo will comply with all applicable structural codes. The roofing material will be a standing rib metal roof attached per manufacturers specifications.

TS-8.3 Each gazebo will be constructed with a lightning protection system.

Legacy Island Development

TS-9.0 Beach Area Fill (Ortona Sand)

TS-9.1 The CONTRACTOR will lightly excavate backfill area(s), to smooth and remove the majority of material that contain organic fines or deleterious substance before placement of beach compatible Ortona sand.

TS-9.2 Placement of backfill material will be by methods determined by the CONTRACTOR to achieve the cross section shown in the plans. Generally, the Ortona sand will be installed a minimum of 12” thick, to supplement the existing sandy beach(es).

TS-10.0 Filter Fabric Materials and Construction

TS-10.1 Filter fabric will be a needle punched nonwoven geotextile with high tensile strength, which allows for passage of water with high soil containment. Fabric must resist biological and chemical degradation. Fabric will be staked in place and overlaps will not be less than 36”. WINFAB 1200N is an example of an acceptable fabric, or ENGINEER’S approved equivalent.

TS-11.0 Signs

TS-11.1 The CONTRACTOR will supply and install the listed signs per, Department of the Army Corp Authorization # SAJ-2020-01321, Special Conditions 8,16 & 17.

• Three each “Florida Friendly Boating,” Special Condition 8.

• Five each, “No fishing” sign at the observation and mooring pier, Special

Condition 16. (Two each vertical and Three each horizontal)

• Three each “Save Dolphin, Sea Turtles, Sawfish, and Manta Ray,” Special

Condition 17.

• Three each “Save Sawfish,” Special Condition 17.

Sign and vendor information can be found at:

https://myfwc.com/wildlifehabitats/wildlife/manatee/education-for-marinas/ https://media.fisheries.noaa.gov/dam-migration/dolphin_seaturtle_sawfish_manta_sign.pdf https://www.fisheries.noaa.gov/resource/educational-materials/save-sawfish-sign

TS-11.2 The CONTRACTOR will supply and install the listed signs:

• Five each “No Mooring” Signs,

• One each “Emergency Vessel Only”

• Two each “Paddle Craft Only” https://myfwc.com/wildlifehabitats/wildlife/manatee/education-for-marinas/ https://media.fisheries.noaa.gov/dam-migration/dolphin_seaturtle_sawfish_manta_sign.pdf https://media.fisheries.noaa.gov/dam-migration/dolphin_seaturtle_sawfish_manta_sign.pdf https://www.fisheries.noaa.gov/resource/educational-materials/save-sawfish-sign

Legacy Island Development Technical Specifications

All signs should be constructed of fiberglass or metal with rounded corners (hand-sanded to remove all sharp edges and burrs). All signs will be constructed of 0.08 Gauge 5052-H38 Aluminum, with an Alodine 1200 conversion coating and engineer grade Type I reflective sheeting. Lettering to be a minimum of 4 inches and meet City/County Code.

TS-11.3 The CONTRACTOR will install all signs at the location shown in the plans.

CONTRACTOR will supply the ENGINEER/OWNER a proof of all signs before fabrication.

TS-12.0 Listed Species Monitoring

TS-12.1 Manatee monitoring in accordance with state and federal permits is the responsibility of the CONTRACTOR. The CONTRACTOR agrees to comply with The November 2017 “National Marine Fisheries Service’s (NMFS) Recently Issued Final Programmatic Biological Opinion (Referred to as JAXBO) for In-Water Work”; the 2011 “Standard Manatee and Marine Turtle Construction Conditions for In-Water Construction”; and the March 2006 “Sea Turtle and Smalltooth Sawfish Construction Conditions”.

TS-13.0 Turbidity Controls and Monitoring

TS-13.1 Turbidity monitoring in accordance with state and federal permits is the responsibility of the CONTRACTOR. Turbidity may not exceed 29 NTU’s above the background. The CONTRACTOR will be responsible for testing, reporting, and compliance with the permit conditions for turbidity monitoring.

TS-13.2 If monitoring shows violations, Work will cease and the ENGINEER will be notified immediately. Work will not resume until the ENGINEER has made a site visit and confirmed that all corrective actions have been taken and turbidity has returned to acceptable levels.

TS-13.3 Turbidity curtains will be used to enclose the Work area from the start of the Work. The absence of turbidity curtains during any in-water phase of the Work will not be allowed. The turbidity curtains will remain in place and be maintained until the authorized Work has been completed and all erodible materials have been stabilized. They will be removed and relocated as the Work progresses once the turbidity levels within the curtains are within 29 NTUs of background levels.

TS-13.4 Turbidity controls will include, but are not limited to, floating turbidity barriers with weighted skirts that extend to the bottom of the river around all in-water construction work. Any silt fencing will be installed per the manufacturer’s specifications. All controls will be inspected daily, and after each rainfall event, and repairs made immediately prior to construction continuing.

TS-13.5 The CONTRACTOR will be responsible for testing, reporting, and compliance with the permit conditions for turbidity monitoring. Turbidity may not exceed 29 NTU’s

Legacy Island Development Technical Specifications above the background. Visual observations of turbidity conditions that might exceed state standards will be conducted throughout the day during all phases of construction.

Visual inspections will be done on a continual basis while construction personnel are on site. Should turbidity observed outside of the turbidity curtains appear to exceed state standards, the CONTRACTOR will stop construction, and collect turbidity samples within the plume and at a background location. Turbidity greater than 29 NTU’s above the background will constitute a violation and will be reported to the ENGINEER and agencies as required by permit. All construction will stop until corrective actions have been taken and all turbidity has returned to acceptable levels.

TS-14.0 Permits and Authorizations

TS-14.1 The CONTRACTOR will comply will all conditions of the State, the Federal, and all necessary Local authorizations.

TS-14.2 The permits and authorizations relating to the proposed work include the following. It is the responsibility of the CONTRACTOR to make sure they have all necessary copies.

• FL Department of Environmental Protection ERP # 0386380-001 EI

• Department of the Army Corp Authorization # SAJ-2020-01321 o Consent to Easement No. DACW17-9-21-0066

• Local Building Permits (to be applied for by CONTRACTOR)

TS-15.0 Confirmation of Work

TS-15.1 The ENGINEER will make occasional site visits during the course of construction to observe progress and confirm compliance with the permits, plans, and specifications.

Stringers 3" x 8", #1 Southern Yellow Pine (Dimensional), 0.6pcf CCA treated on 18” centers max.