Technical_Provisions.pdf

TECHNICAL

PROVISIONS

TECHNICAL PROVISIONS

1. GENERAL: The intent and purpose of this Project is to provide dredging of approximately

12,054 linear feet of channel, generally 50 feet (ft) wide, and to -4 ft MLW in accordance with the approved Plans and Specifications and all requirements of the Contract Documents. The Work includes mobilization/demobilization, the mechanical and/or hydraulic removal of sediment as shown on the Plans and Specifications, acquisition and construction of temporary staging areas, the construction of necessary retention ponds and/or return water control structures, dewatering of sediment, loading sediment into Contractor provided sealed trucks, the transportation to and disposal of the dredged sediment at the Sarasota County Landfill facility, all erosion and turbidity control, turbidity monitoring and reporting, and final site cleanup (including any temporary staging areas) and restoration of any work area utilized in performance of the Work.

The Work to be performed is within relatively shallow, tidal segments of Phillippi Creek. Total Bid Price represents Contractor’s price to complete the Work as described in the Contract Documents. This includes, but is not limited to, utility and drainage structure conflicts that may require locating, modifying, extending or moving either existing utilities, drainage structures or the proposed work. The Contractor shall have no claim for additional compensation for utility or drainage structure conflicts encountered.

The estimated in-situ volume of sediment to be removed is approximately 63,827 cubic yards and is separated into volumes for each dredge segment in Table 1 below. The estimated amounts may be used to calculate a unit price in any contract modifications issued for an adjusted horizontal footprint of dredge area. The estimated volume shall not be used as a basis of payment for Lump Sum bid items. For excavation and dredging, the estimated volume is based on in-situ conditions and does not include any allowance for overdepth dredging, debris removal or material swell. The Contractor recognizes the potential for significant difference between the estimated in-situ material volume and the actual volume of material removed for final disposal. The Contractor is in agreement that no claim for delay or additional cost will be submitted to the County for any increase in the volume of material for final disposal.

Contractor shall determine the most cost-effective method of excavation or dredging (mechanical or hydraulic) and utilize load-out sites, temporary staging areas, and/or a confined staging area consistent with conditions in the Contract and Controlling Documents. Bid prices shall include the cost of Best Management Practices for pollution prevention including erosion, sediment and turbidity control.

Table 1 – Dredge Volume Estimates

Section Cut Volume (Cubic Yards)

1 2,530 2 1,433 3 8,350

4 7,864 5 3,832 6 17,866 7 2,265 8 5,064 9 4,675 10 7,001 11 2,947

Total 63,827

2. PERMITS AND RESPONSIBILITIES: The County is obtaining permits related to the construction of this project from Sarasota County Environmental Protection, State of Florida Department of Environmental Protection (FDEP) and U.S. Army Corps of Engineers. The Contractor shall be responsible to be in compliance with all requirements, conditions and restrictions within the Project permits. The Contractor shall be required to comply with any environmental laws and regulations that are applicable to the Project (e.g, Sarasota County Earthmoving Ordinance). It is the Contractor’s responsibility to identify and become familiar with such environmental laws and regulations. Project permits will be provided by the County when obtained. The Contractor shall be responsible to acquire all other permits required for the work. Work completed by the Contractor, relative to this item, shall be included to the contract lump sum price for Bid Item 1.

3. MOBILIZATION AND DEMOBILIZATION: Contractor is responsible for the preparation of dredge operations in mobilizing and demobilizing equipment and labor from the beginning to the end of Work. The Work will include, but is not limited to, those operations necessary for the movement of personnel, equipment, supplies and incidentals to and from the Project site, and for the establishment of temporary offices, buildings, safety equipment and first aid supplies, sanitary and other facilities. The cost of bonds and insurance, and any other preconstruction expense necessary for the start of the Work, including the cost of construction materials, final clean-up and demobilization shall be included in the Contract Price.

a. All costs connected with the mobilization and demobilization of all the Contractor’s equipment and personnel, including dredge equipment, will be paid for at the contract lump sum price for Bid Item, “Mobilization/Demobilization”. Sixty percent (60%) of the lump sum price will be paid to the Contractor after commencement of dredging and disposal at the County Landfill of a quantity of, at minimum, 200 cubic yards of material. The remaining forty percent (40%) will be included in the final payment for work under this Contract.

b. Work completed by the Contractor, relative to this item, shall be included to the contract lump sum price for Bid Item 1.

4. DREDGE OPERATIONS: Equipment setup shall be performed in a manner that is approved by all regulatory agencies and the County. All equipment shall be subject to inspection by the County at all times. Type of equipment and method of operation is the Contractor’s option (unless specifically specified in the Project permits) with the following exception(s):

a. Sauerman drag type equipment pulled back and forth between a pair of barges is not acceptable.

b. Loading and unloading must be done in such a way so that no sediment or other material is lost over the sides of the barge during loading, unloading, or transit.

c. No dredge material shall be unloaded or placed back into the water. Double handling of dredge material that causes spills or re-entry into waterway is strictly prohibited without prior County approval.

d. Under no circumstances will use of explosives or excavation of rock be permitted.

e. Accumulated sediment within the waterway outside of the dredge footprint greater than

6 inches shall be removed at the Contractor’s expense.

f. Sweeping (i.e. back and forth movement of excavator bucket) of sediment within the waterway is prohibited.

g. Dredging barges shall not be maneuvered within the waterway via pushing or pulling of excavator arm or bucket.

h. Equipment shall be properly sized to fit within the limits of dredge footprint width.

Equipment larger than the dredge footprint width is prohibited.

5. DREDGING: Dredging under this Contract shall include removal, transportation, and disposal of dredged materials described herein and shown on the Contract Drawings. This Work is to provide dredging to a depth of -4 ft MLW and a channel bottom width of generally 50 feet (as described on the plans). The Work consists of furnishing all labor, material, equipment, and incidentals necessary for performing the Work specified by the Contract. All Work shall be in accordance with the Plans, Specifications and requirements set forth within the Contract and Project permits. All Work is to be conducted in accordance with all federal, state and local permits and authorizations issued for this Project.

a. Allowable Overdepth.

It is understood that the dredging process is imprecise; however, material actually removed from within the Project area is limited to a depth of -4 ft below mean low water. The Contractor shall not exceed -4 ft below mean low water. In the event over-dredging occurs, no additional payment will be made.

b. Dredge Material Overflow.

No overflow of dredged slurry from hopper dredges, hydraulic dredges pumping into dump scows, or mechanical dredges loading into dump scows, will be allowed. This captured water shall not overflow transport vessel sidewalls nor shall it be dumped (or pumped) from the vessel except when placed directly at an authorized disposal area. Mechanical dredge bucket drippings between the digging point and deposition into dump scows will not be considered overflow.

c. Excessive Dredging.

Material removed from beyond the dredging limits as specified on the Contract Drawings shall be considered excessive dredging for which payment will NOT be made. The Contractor shall be responsible for all federal, state, and local regulatory permits, implications, violations and/or fees as a result of excessive dredging.

d. Misplaced Dredged Materials.

Any dredged materials deposited at locations other than as designated or approved by the County shall be considered misplaced material and shall NOT be paid for until the Contractor, at their expense, removes and redeposits such misplaced material to the approved disposal site. This required removal and redeposit of the misplaced material and any necessary disposal site restoration work shall not be the basis for a time extension or additional compensation under this Contract.

e. Disposal of debris and obstructions.

Debris, such as stumps, rocks, rock fragments, roots, logs, trash, vegetation, etc.

and any other objects except archeological or historic resources that exist within the project area or are unearthed during the dredging operations, shall be removed, transported, and disposed of at the County Landfill. If archeological or historic resources are encountered the Contractor shall notify the County immediately and stop Work until directed to restart. Removal and disposal of debris and obstructions shall not be provided for separately for payment. All costs associated with the required disposal of debris shall be included in the Contract Price for Lump Sum Item 3. These specifications are not an all-inclusive reference of debris types, which may be encountered during this dredging.

f. Private Supplemental Dredging.

In the event that the Contractor is hired by private property owners within the Project area to dredge around docks, seawalls, moorings, etc., the Contractor will indemnify the County of liability of any damage that may result from this activity. The Contractor shall only start this work after completion and acceptance of the dredging Work for the County. The Contractor shall be responsible for all coordination and payment of all fees with the Landfill and County Solid Waste Department for this activity. Contractor shall comply with all state, federal and local permitting requirements in performance with any private supplemental dredging activities. Contractor shall provide the County a copy of agreements with private residents and copies of necessary permit documents prior to performance of any supplemental private dredging activities.

g. Sediment Accumulation Contractor shall be responsible for the removal of any sediment material that accumulates in the dredged channel after initial establishment of the initial channel at no additional cost, and prior to Final Acceptance.

h. Sediment accumulation outside of dredge footprint Following Substantial Completion, the pre-construction survey will be compared to post-construction survey. Accumulated sediment within the waterway outside of the dredge footprint greater than 6 inches shall be removed at the Contractor’s expense. Work completed by the Contractor, relative to this item, shall be included to the contract lump sum price for Bid Item 2.

6. TEMPORARY STAGING/DEWATERING AREAS: Contractor is responsible for acquiring, constructing, maintaining and restoring any temporary staging area(s) where dredged material will be staged prior to bulk transfer to the County Landfill or other location approved or directed by the County. The temporary staging area(s) may be used with prior written permission of the owner of the property (public or private). If located on private property, the Contractor shall indemnify the County of all responsibility for construction, maintenance and restoration of that site.

All private or public sites utilized by Contractor in performance of the Work shall be restored prior to Final Acceptance and final payment. Prior to application for final payment, the Contractor shall provide documentation from the owner of each private property for which an agreement for use was provided, or for which the County has issued written notification to the Contractor, that each owner is satisfied with the manner in which the Contractor has restored the property. Final Acceptance shall not be provided and final payment shall not be paid until such documentation is received by the County.

The construction, maintenance, and renovation of the temporary staging/dewatering area(s), and the ingress and egress routes, are the responsibility of the Contractor. Such activities shall be performed in the manner agreed upon by the owner of the property affected, prior to the onset of construction activity.

Contractor is responsible for all permits from federal, state and local regulatory agencies and authorizations that may be required for any temporary staging/dewatering area(s). Work completed by the Contractor, relative to this item, shall be included to the contract lump sum price for Bid Item 4.

7. DISPOSAL: All dredged material shall be transported and disposed of in the County Landfill or alternative location approved or directed by the County. The Contractor shall be responsible for all coordination with the County Solid Waste Department for this activity.

The Landfill’s physical address is 4000 Knights Trail Road, Nokomis, Florida 34275, and the hours of operation are 8am-5pm Monday – Saturday. Any alternative location directed by the County will be a closer driving distance than the County Landfill.

Disposal of fill from the project area onto private lands is not authorized under this contract unless provided via separate agreement and authorization by the County.

A maximum of 200 cubic yards per day of dredge material is authorized to be disposed at the County Landfill. Any amount in excess of 200 cubic yards per day must be authorized by the County a minimum of 7 days in advance of transport to the County Landfill. Except for undue conditions, as determined by the County, the County is not inclined to authorize amounts in excess of 200 cubic yards per day to be disposed at the County Landfill. Dewatered material will be disposed of within the lined portions of the Landfill, as directed by Veolia Environmental Services (landfill operator). The Contractor shall provide transport vehicles capable of traversing ground conditions within the lined portions of the Landfill.

The Contractor shall be responsible for close coordination of dredge material disposal at the County Landfill with Sarasota County Solid Waste Operations Manager.

The Contractor shall be responsible for understanding all assumptions, computations, and procedures in compliance with the specified disposal of dredged material. The Contractor will address all situations regarding disposal and be responsible for any required testing, monitoring, preparation, operation and maintenance actions involved.

Prior to the Pre-Construction Conference, Contractor shall submit to the County a dredge spoil transportation plan for the transportation of material to the disposal site. Entry and exit from staging areas shall only be through those points specifically approved by the County. Other ingress and egress routes may be used with prior written permission of the property owner and with the prior approval of the County.

Excavated material shall be hauled in trucks, trailers or other vehicles which are constructed in such a manner as to prevent leakage or spillage onto County streets. Contractor will be responsible for cleaning up such leakage and spillage immediately.

Contractor shall perform all earthmoving activities in accordance with relevant County Codes.

Contractor is responsible for all work, labor, materials, expenses, transportation, direct or incidental to the completion of the activity. Spoil material delivered to the County Landfill must meet all requirements for use at the facility. The County will provide the Contractor with results of sediment testing. The Contractor will be responsible for coordination with the County Landfill regarding the usage, needs and proper disposal location for the dredge material. At a minimum, all dredge material to be disposed at the County Landfill is required to be free of Liquid Waste. Liquid Waste means any material that is determined to contain free liquids as defined by Method 9095 (Paint Filter Liquids Test), as described in “Test Methods for Evaluating Solid Wastes, Physical/Chemical Methods” (EPA Pub. No. SW-846).

a. Contractor’s Option: The Contractor may propose an alternative final dredge material disposal location to the Sarasota County Landfill. If proposed, the Contractor will be responsible for completing all permitting and regulatory requirements with 60 days of contract award by the Board County Commissioners or as otherwise authorized by the County Project Manager. If unable to obtain regulatory authorization within the required timeframe, the Contractor shall be required to dispose of dredge material at the Sarasota County Landfill. The Contractor shall not submit any claim for delay or additional costs incurred for not being able to use the alternative site and having to dispose of the material at the County Landfill. The Contractor shall be responsible for any severance fees imposed by the Florida Department of Environmental Protection.

Work completed by the Contractor, relative to this item, shall be included to the contract lump sum price for Bid Item 3.

8. QUANTITIES: The County has performed a pre-dredge survey which is included in the Contract Drawings. This pre-dredge survey was used to calculate the estimated quantity of material to be dredged (see Pricing Table Notes). This quantity is considered an estimate and is not the basis for payment to the Contractor. Payment for this Work shall NOT be based on the volume of material (cubic yards) removed from the Work area. The Contractor shall be compensated solely based on the lump sum bid price. Contractor shall make an assessment of this and any other relevant information necessary, in the judgment of the Contractor, in determining the expected volume to be removed. The Contractor recognizes the potential for significant difference between the estimated in-situ material volume and the actual volume of material removed for final disposal. The Contractor is in agreement that no claim for delay or additional cost will be submitted to the County for any increase in the volume of material for final disposal. The County will also perform a post-construction survey of the work area for verification and Final Acceptance and invoicing.

9. CHARACTER OF MATERIALS: The sediment testing and laboratory data for the Project are located in Soils Report Section . The results represent conditions at the time of the investigation. Debris may exist within limits of the Work and the Contractor shall make an interpretation of this information in determining the character of materials to be dredged. It should be expected that some large and small debris that are not indicated in the sediment testing or Contract Drawings may exist within the limits of the Work. Types of debris that may be encountered include but not limited to stumps, rocks, rock fragments, roots, logs, trash, vegetation, etc. All classifications of soils, both visual and laboratory, are in accordance with the Unified Soils Classification System, compatible with ASTM D-2487.

This information is provided by the County for use by the Contractor, however, Contractor is responsible for conducting its own investigation of the character and type of material expected to be encounter during the Work.

10. DREDGING SURVEYS: The County will furnish survey control data for the dredge area prior to any dredging activity. The County will be responsible for pre-, stake-out, and post-construction survey work under this Contract for the terms of acceptance and completion of Work. Cross-sections will be prepared showing dredge surface and design template. The Contractor will be notified when survey work is to be completed, and will be permitted to accompany the survey party at any time. The Contractor, at their own expense, is authorized to perform verification or supporting surveys, within the Project limits, during the bidding or execution of the Work.

11. CROSS-SECTION: The Contractor shall dredge and excavate the Project area to a depth of -4 feet MLW and a channel bottom width of generally 50 feet (as described on the plans). No excavation shall be performed closer than 10 feet from any seawalls, docks, boat-lifts or any other structure.

Work completed by the Contractor, relative to this item, shall be included to the contract lump sum price for Bid Item 2.

12. ROCK EXCAVATION: For purposes of this Contract, “rock” applies to any naturally occurring bed of hard cemented material, which cannot be excavated with the equipment used for dredging bottom sand and silt under this Contract. It is defined as material that is so hard or tightly cemented that a drop punch or other mechanical means is necessary to break up the material prior to it being removed by the dredging equipment. However, the Contractor shall be prepared to complete the Work while dealing with rock fragments, rock pieces, etc. within the dredge material.

The intent of this Contract is “maintenance dredging” to restore conveyance capacity of the Creek. Should rock be encountered, the County may direct the Contractor to allow the material to remain or to excavate to a lesser width or depth, thus minimizing the removal of rock material. The primary consideration in such cases will be the effect on navigation. Any rock excavation work must have County approval to proceed, at an agreed upon price and at the issuance of a change order.

13. NAVIGATION AIDS: The Contractor shall not be responsible for installing, replacing, or otherwise altering existing navigational aids as part of this project. The Contractor shall be responsible for notifying the USCG of the project start date in a timely manner to support Contractor’s schedule and shall coordinate with the USCG for the completion of this activity.

Work completed by the Contractor, relative to this item, shall be included to the contract lump sum price for Bid Item 1.

14. TURBIDITY CONTROL The Contractor shall furnish all labor, materials, and equipment, and perform all activities required to maintain turbidity control. Turbidity control shall be used as required by the Project permits and Section XVIII of the contract documents. The Contractor shall ensure turbidity control devices (i.e., turbidity curtains) will be maintained and remain in place for the duration of the Work. The Contractor will be responsible for ensuring that turbidity control devices are inspected daily and maintained in good working order so that there are no violations. Contractor shall clean out and properly dispose of any debris that may accumulate in all turbidity control devices on a weekly basis and after every rain event. Work completed by the Contractor, relative to this item, shall be included to the contract lump sum price for Bid Item 2.

15. TURBIDITY: The Contractor shall furnish all labor, materials, and equipment, and perform all activities required to obtain, analyze, and report the results of turbidity monitoring.

Monitoring of turbidity will be conducted using a device (turbidity meter) that meets the required specifications for conducting such tests as provided in the Project permits and Section XVIII of the contract documents. Upon request, the Contractor will make available to the County a copy of the operating instructions and standards used in calibrating equipment used in collecting samples for turbidity. Work completed by the Contractor, relative to this item, shall be included to the contract lump sum price for Bid Item 2.

16. TURBIDITY MONITORING REQUIREMENTS: Sampling shall be conducted in accordance with techniques and procedures described in Section XVIII of the contract documents. Samples obtained for turbidity analysis shall be analyzed within 30 minutes of collection. Samples shall be taken with equipment that does not allow contamination by water from any other depth. The Contractor will immediately notify the County of any turbidity samples that exceed permit limits. A report of all turbidity samples and results shall be submitted weekly to the County.

17. TURBIDITY TESTS: The Contractor will maintain a certification, attesting to the accuracy of testing equipment and procedures. A duplicate of the standard used to calibrate the testing instrument as well as a complete set of operating instructions for the turbidity testing equipment will be made available at the County’s request. The Contractor will use this standard throughout the project to maintain the calibration of the equipment. Whenever there is doubt as to the adequacy of the testing or validity of the results, the County may request that additional tests be performed. The Contractor shall be responsible for any costs associated with requested additional testing and the County will withhold these costs from the next pay request submitted by the Contractor.

18. SIGNAGE:

a. Temporary signs concerning manatees shall be posted prior to and during all construction/dredging activities. A sign measuring at least three feet by four feet which reads “Caution: Manatee Area” shall be posted in a location prominently visible to water related construction crews. A second sign shall be posted if vessels are associated with the construction and shall be placed visible to the vessel operator. The second sign shall be at least 8 1/2 inches by 11 inches and read:

Caution: Manatee Habitat. Idle speed is required if operating a vessel in the construction area. All equipment must be shutdown if a manatee comes within 50 feet of the operation. Any collision with and/or injury to a manatee shall be reported immediately to the FWC Hotline at 1-888-504-FWCC (1-888-504- 3922). The U.S. Fish and Wildlife Service should also be contacted in Jacksonville (1-904-232-2580) for North Florida or in Vero Beach (1-772-562- 3909) for South Florida.

Specific information on obtaining these signs may be obtained by contacting the Department or FFWCC at (850) 922-5330.

All signs are to be removed by the Contractor upon completion of the project.

Work completed by the Contractor, relative to this item, shall be included to the contract lump sum price for Bid Item 1.

19. DREDGE MATERIAL MANAGEMENT AND MOBILIZATION SITE

INFORMATION

The awarded contractor(s) are responsible for securing and permitting dredge material management and mobilization sites. The following properties have been initially evaluated as potential sites for dredge material management or mobilization. If more than one contractor is awarded the work, then it will be up to each contractor to cooperate with others and/or secure their own independent sites. Only property addresses are provided. Each site may have specific constraints for use that will need to be further explored by the contractor(s) to ensure suitability for use. The County makes no guarantee that any of these sites will be suitable for use.

a. County-owned Properties:

Sites Available for Use after Contractor Obtains Required Permits:

• 2792 Valencia Dr./Immediately south of S. Tuttle roundabout

• 2540 Bee Ridge Rd./Immediately south of Bee Ridge

• 2404 Nassau St./Approx. 1/3 mile north of Proctor Rd.

• 1027 Greer Dr./Immediately west of S. Beneva Rd.

• 5500 S. Tamiami Trail/Phillippi Estate Park/Immediately SW of U.S. 41 Pending Site:

• 2401 Ashton Rd. – Approx. 1,300ft south of Riverview H.S. (Early Acquisition

Stage) Unusable Sites:

• 1420 Gilbert Ave./Pinecraft Park/Immediately south of Bahia Vista St

(Space/Heavy Equip.)

• 1 Ram Way/Riverview H.S. (Interference with school activities)

b. Privately-owned Properties:

The awarded contractor(s) are required to contact the respective property owners to negotiate potential use of the following private properties:

• 5353 S. Tamiami Trail

• Empty lot at 2004 Montclair Dr.

• Empty lot at 5515 S. Tamiami Trail

• Empty lot at 3555 Hacienda St.

• 2615 Olivia Ln

• 2617 Olivia Ln

• Empty lot at 3250 N. Seclusion Dr.

• Empty lot at 3226 N. Seclusion Dr.