24-8250_Exhibit_L_-_Bid_Memo.pdf

M E M O R A N D U M

February 11, 2024 Revised: March 19, 2024

TO: PROSPECTIVE CONTRACTORS

FROM: Lee Davidson, P.E. ; Project Manager

RE: Golden Gate Golf Course – Outfall Swale Request for Proposal (Construction Documents)

General Site Information:

The Golden Gate Golf Course Outfall Swale is a drainage project located along the southwest side of the existing Golden Gate Golf Course. The project is located west of Collier Boulevard, east of 41st Street SW, and north of the Golden Gate Main Canal. As requested by Collier County, this invitation is to obtain fair and competitive bid responses for the proposed project.

Figure 1. Project Location Map. The project area is highlighted in yellow.

Existing Conditions / Plan of Construction

An existing outfall swale bisects the southern portion of the Golden Gate Golf Course. To facilitate the construction of a new affordable housing project on this site, Renaissance Hall at Old Course (SDPA PL #20220006194), it is necessary to relocate the existing outfall swale to the western property boundary.

This adjustment ensures that both existing and future stormwater management systems can effectively discharge into the Golden Gate Main Canal. The proposed swale will start just south of the southernmost lake, follow the western property line, and end at the Golden Gate Canal. The current swale's discharge into the Golden Gate Canal is regulated by an earthen berm that incorporates a crushed corrugated 24-inch outfall pipe, as illustrated in Figure 2 below. Part of this project involves restoring and stabilizing the earthen berm with sod and replacing the 24-inch outfall pipe to guarantee the stormwater management system operates as intended. The outfall area, densely populated with vegetation, predominantly consists of prohibited exotic species that must be removed. Potential bidders are strongly advised to visit the site prior to submitting their bid packages.

Figure 2. Picture of the existing earthen berm and crushed corrugated outfall pipe as it is seen from the north side of the berm.

Project Scope

The project scope encompasses the construction of approximately 2,406 linear feet of a 35-foot wide lined outfall swale, along with the reconstruction of the existing approximately 300 linear feet of swale, berm, and outfall pipe near the Golden Gate Main Canal. The proposed swale is designed to accept inflows from the existing golf course stormwater management system and any future developments. It is required that all existing utilities, irrigation equipment, nearby private residential site improvements, and telecommunication assets affected by the swale installation be restored or relocated as necessary.

For details on the site construction bid scope, refer to the Davidson Engineering Plan Set.

The contractor must coordinate construction activities to minimize impacts on nearby residential communities during the construction period.

The following electronic documents are included for the contractor's review:

Davidson Engineering Construction Plans Contractor Bid Schedule – Areas in yellow to be completed by the contractor.

Bid Schedule Line-Item Description Special Specifications for Impermeable Liner (Supplemental Specifications) Soil Management Plan prepared by Langan

Bids must be submitted with insurance and license information. The contractor is required to provide a list of bid exclusions, if any. Additional information regarding subcontractors, including their scope of work and responsibilities, must be provided. The quantities mentioned are based on the engineer's estimates. The contractor is responsible for confirming the bid schedule and plan quantities.

Special Project Scope Conditions:

Besides the typical construction specifications that apply to projects in Collier County (FDOT

Standard Specifications for Road and Bridge Construction and Collier County’s Technical Specifications), the construction of the swale liner is to conform to the included “Special Specifications for Impermeable Liner”.

Reference the bid schedule line-item description (below) for a detailed description of each bid line item.

Golden Gate Golf Course Outfall Swale – Bid Schedule Line-Item Description

Site Work

1 Mobilization. This line item includes costs associated with bringing necessary equipment and materials to the site and removing these items once construction is completed. Contractor is also responsible to leave project area in a clean and orderly condition with all waste properly disposed of upon departure.

2 Includes maintenance and replacement of silt fence as needed through the duration of construction. Silt fence to be installed on both sides of swale construction.

3 Includes maintenance and replacement of turbidity barriers installed within the Golden Gate Canal as needed through the duration of construction. Contractor is responsible for NDPES monitoring and reports. See the Existing Conditions, Clearing, and NPDES Pollution Prevention Plan on sheet C-

10.00 for the locations and details of the proposed turbidity sediment barriers.

4 Contractor is responsible for NPDES monitoring and reports as required by the Florida Department of Environmental Protection. All NPDES activities to conform to the Collier County Water-Sewer District Utilities Standards Manual Section 2, Division 1, Specification 014127.

5 Survey firm at contractor’s option. Contractor is responsible for construction stake-out and as-builts of all drainage and site improvements. As-built survey information to be provided to the owner and engineer of record in DWG format and located in the state plane coordinate system.

6 This task is required to locate existing utilities and irrigation lines that may be present within the project area. The contractor is to notify the Engineer immediately if any discovered existing utilities would create a deviation from the construction plan set. The contractor is responsible to provide to the Engineer of Record and owner information on field determined utility locations, depths, type, and material before commencing any construction. Field location of utilities must be performed through an accepted method such as soft digging.

7 Contractor to remove existing prohibited exotic vegetation as listed in the Collier County Land Development Code. Removal to also include any vegetation that conflicts with the proposed Swale alignment as well as any root systems. Clearing to comply with Collier County technical Specification 017416.

8 Site grading to conform with the proposed contour lines as outlined on Sheets C-21.00, C-21.01, C- 25.00, 25.01. All soil used to construct aspects of the project such as the proposed berms shall be substantially free of organics. Site grading to comply with Collier County technical Specifications 312316 and 314000.

9 Dewatering necessary for swale construction and liner installation. The contractor is responsible to obtain a SFWMD de-watering permit and abide by the conditions of the permit through the course of construction and Collier County Technical Specifications 312319. Any fines generated by the contractor for failing to comply with the de-watering permit are the responsibility of the contractor to settle with the District.

10 All grassed/ open space areas disturbed by construction are required to be sodded. Contractor is responsible to water sod until established. Sod material to be installed as outlined in the included plans. Contractor to use bahia sod. Sod installed shall comply with the FDOT Standard Specifications for Road and Bridge Construction Section 981 (Latest Edition) and the Collier County Technical Specifications 329200.

11 Excess soils excavated from the project area during construction must be transported by the contractor to the Collier County Landfill, as detailed on Sheet C-27.00 of the included site civil plan set. Soil excavation and removal must comply with the Soil Management Plan prepared by Langan.

The material transported to the Collier County landfill must be stockpiled at a designated site within the landfill premises. This requires coordinating the logistics of material transportation, ensuring efficient handling, and using appropriate machinery such as trucks and loaders for the safe movement of materials, thereby minimizing disruptions to landfill operations. Adherence to regulations and safety protocols will be maintained throughout the entirety of the operation to mitigate any potential risks to the environment or personnel. The process includes sorting out rocks larger than 6 inches in diameter to comply with landfill requirements. Upon completion of the material exporting and stockpiling process, the materials must be left in a neat and secure pile at its designated location within the landfill.

The contractor is required to give the County’s Solid Waste Operations a minimum of 48 hours' notice before transporting excess soils to the landfill.

Drainage Utilities 12 Task includes installation of the 30 mil impermeable swale liner as shown in the plans. The liner is to be installed in conformance with the provided “Special Specification Impermeable Liner”. Liner installation is to occur under the initial ±2,406 linear feet of the proposed swale. This ±2,406 LF excludes the portions of the southernmost existing swale that is to be re-shaped.

13 Line item includes labor, material, and equipment necessary to remove the existing crushed corrugated outfall pipe and replace with a 24” RCP drainage pipe. The contractor is responsible to properly dispose of the removed pipe. Pipe material can be substituted for dual wall HDPE upon review and written approval of the owner and Engineer of Record.

14 This task includes the installation of two proposed mitered end sections at the ends of the proposed 24” drainage outfall pipe. The northernmost mitered end section’s construction shall comply with FDOT Standard Plans for Road Construction (Latest Edition) Index No. 430-022 and the southernmost mitered end section’s construction shall comply with FDOT Index No. 430-021.

Mitered end sections to include the installation of grates on each end as specified in FDOT Index No. 430-022.

Bid Alternate 15 Line item includes labor, material, and equipment necessary to remove the existing crushed corrugated outfall pipe and replace with dual 36” RCP drainage pipes. The contractor is responsible to properly dispose of the removed pipe. Pipe material can be substituted for dual wall HDPE upon review and written approval of the owner and Engineer of Record. Task 15 would supersede Task 13 if the alternate option is chosen for execution.

This task includes the installation of two proposed dual pipe metered end sections at the ends of the proposed dual 36” drainage outfall pipe. The northernmost mitered end section’s construction shall comply with FDOT Standard Plans for Road Construction (Latest Edition) Index No. 430-022 and the southernmost mitered end section’s construction shall comply with FDOT Index No.

430-021. Mitered end sections to include the installation of grates on each end as specified in FDOT Index No. 430-022. Task 16 would supersede Task 14 if the alternate option is chosen for execution.

17 Bid line item to include the labor and material to install two 36” in-line all rubber check valves with slip-in cuff connection. Check valves to be CheckMate Ultraflex Slip-in Inline Check Valve or approved equivalent.

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