Phase 3 Drainage Project - Outfalls & Basin

City Council tasks the Planning Commission with developing a strategy to address drainage problems.
Completed: Aug 22, 2017
2017
Planning Commission begins discussing the issues and meeting with experts regarding next steps.
Completed: Sep 20, 2017
September 20, 2017
Planning Commission concludes that the next stormwater priority should be to improve the outfalls between 30th and 41st Avenues.
Completed: May 9, 2018
May 9, 2018
After interviewing several firms the Planning Commission recommends that City Council Enter into an agreement with Thomas and Hutton.
Completed: Oct 11, 2018
October 11, 2018
City Council approves award of a contract to Thomas & Hutton in the amount of $100,800 for surveying, needs assessment and conceptual design of Phase III Drainage Project.
Completed: Nov 27, 2018
November 27, 2018
City Council approves a proposal from Thomas & Hutton for small but high impact drainage projects in the basin along the Phase 3 Drainage project area.
Completed: Mar 26, 2019
March 26, 2019
City staff presents proposal to improve five (5) drainage deficient areas located on the basin between 30th and 41st Avenue.
Completed: Jul 23, 2019
July 23, 2019
City Council approves change order from Thomas & Hutton for small but high impact drainage projects in Phase 3 and issues approval of design, engineering, and permitting of Phase 3 Drainage Project.
Completed: Aug 27, 2019
August 27, 2019
City Council approves proposal in the amount of $18,900 for a conceptual assessment of the elevation of the Waterway Boulevard path to provide added protection from rising tidal waters.
Completed: Jun 23, 2020
June 23, 2020
City Council approves FY21 budget including funding for the small but high impact drainage projects and construction of the Phase 3 Drainage Project.
Completed: Jun 23, 2020
June 23, 2020
City Council approves a change order in the amount of $30,000 for Thomas & Hutton to conduct bidding and construction administration services for the small but high impact drainage projects.
Completed: Jul 28, 2020
July 28, 2020
The City submits a grant application to the Rural Infrastruction Authority for grant funds towards the construction of Phase 3 Drainage Project.
Completed: Sep 14, 2020
September 14, 2020
The City advertises RFB 2020-06 seeking bids for the construction of the small but high impact drainage projects.
Completed: Sep 27, 2020
September 27, 2020
City staff will hold a pre-bid meeting with interested bidders to provide an overview of the project and answer questions.
Completed: Oct 8, 2020
October 8 2020
Deadline for submission of proposals for the construction of the 5 small but high impact drainage projects.
Completed: Oct 29, 2020
October 29 2020
Utility relocations begin
Completed: Mar 1, 2021
March 1 2021
Drainage pipe installation - 41st Avenue
Completed: Mar 15, 2021
Mid March
Drainage pipe installation - Sparrow DriveDrive
Completed: Apr 1, 2021
Early April
Drainage pipe installation - Forest Trail
Completed: Apr 15, 2021
Mid April
Drainage pipe installation - Cross Lane
Completed: Apr 29, 2021
End of April
Council approves change order to Thomas & Hutton to include bidding and construction oversight of the 30th & 36th Ave Outfall Projects.
Completed: Jul 27, 2021
Jul 27 2021
Bid packet for construction of 30th & 36th Ave Outfall is released to prospective bidders.
Completed: Sep 14, 2021
Sep 14 2021
City holds pre-bid meeting with prospective bidders for the construction of 30th & 36th Ave Outfall Projects.
Completed: Sep 24, 2021
Set 24 2021
Deadline for bids for the construction of the 30th & 36th Avenue Outfall Project.
Completed: Oct 15, 2021
Oct 15 2021
City opened bids for the construction of the 30th and 36th Outfalls
Completed: Nov 10, 2021
Nov 10 2021
City Council approves a contract to Quality Enterprise in the amount of $2.27M
Completed: Nov 17, 2021
Nov 17 2021

The City has initiated the third phase of a project to improve storm water and tidal drainage across the island. This project is intended to make significant drainage improvements to the 30th, 36th and 41st Avenue outfalls which will improve conditions on the amount of standing water events experienced by residents and property owners.

The project began in 2017 when City Council tasked the Planning Commission with developing a strategy to address drainage problems. As part of the project, smaller but impactful drainage improvement projects along the basin will also be addressed. These are located at Sparrow Drive, Forest Trail, Cross Lane, 32nd Avenue and 41st Avenue.

The construction of the 30th and 36th Avenue outfalls began in early 2022 and expected completion in 2023. The construction of the drainage improvements to the 41st Avenue outfall is scheduled to begin in the fall/winter of 2023. 

Project Updates

Road Closure and Detour Due to 30th Avenue Drainage Project
Wednesday, May 18, 2022

Construction has started on portions of the City's Phase 3 Drainage Project in the areas of 30th Avenue, Forest Trail and Waterway Boulevard. 

The project will provide a much-needed improvement to the flow of storm water out of the area, while also slowing tidal water from entering the system.

The improvements will include new piping under the pavement at the intersection of 30th Avenue, Waterway Boulevard and through the golf course, cleaning the channel through the marsh, as well as a new backflow valve system.

There will be a certain level of inconvenience associated with the work including construction sounds, large moving equipment, the storage of materials, and ultimately the closure of Waterway Boulevard with a detour. The detour is expected to begin in mid August and last several weeks. The portion of the project around 30th Avenue should be complete in early September and the contractor will then move to the Forest Trail area.

During the temporary road closure, all traffic on Waterway Boulevard will be rerouted at 29th Avenue and 31st Avenue to Palm Boulevard.

Phase 3 Drainage Update - May 2022
Tuesday, May 17, 2022

30th & 36th Avenue:

  • Construction started at 30th Avenue
  • Golf course portion of the work completed by June
  • Waterway & 30th road closure mid/late July to end of August
  • Waterway & 36th road closure late September - mid October

  • City staff met with Dominion Energy, Thomas & Hutton and Quality Enterprises on site at 30th Avenue on May 17, 2022 to coordinate efforts to temporarily relocate the power pole located at the corner of the ditch where the new drainage infrastructure is being installed. The power pole and the guide wire need to be moved approximately 4 feet away from the ditch, but within the existing drainage easement.

    Additionally, the contractor has indicated that the overhead power lines may need to be temporarily moved as well while the crane installs the box culvert to allow the proper clearance (15 feet) between the active power lines and the crane lifting the box culvert from truck and placing it on the ground. All stakeholders are coordinating efforts to evaluate alternatives to facilitate installation while minimizing disruption and avoiding delays in the schedule. 

41st Avenue:

  • Wetland permit (OCRM and USACE) still pending. City has conditional approval from OCRM. All other permits are contingent on the wetland permit.
  • Project was put on public notice on April 14 until May 14.
  • City received $1.4M grant from the SC Office of Resilience from CDBG-MIT funds for construction.
  • City held kick-off meeting with Office of Resilience staff and Thomas & Hutton to determine next steps to get the project ready to go to bid once permits are in hand.
Phase 3 Drainage Update - April 2022
Tuesday, April 19, 2022

30th & 36th Avenue:

  • Pre-construction meeting held today, 4/19 with Thomas & Hutton, Quality Enterprises & IOPWSC
  • May 2 – site prep begins, and May 5 construction begins
  • Golf course portion of the work completed by June
  • Waterway & 30th road closure July 28 – August 8 (10 days)
  • Waterway & 36th road closure October 3 – October 8 (5 days)

41st Avenue:

  • Wetland permit (OCRM and USACE) still pending. City has conditional approval from OCRM. All other permits are contingent on the wetland permit.
  • Project was put on public notice on April 14 until May 14.
  • City received $1.4M grant from the SC Office of Resilience from CDBG-MIT funds for construction.
  • City held kick-off meeting with Office of Resilience staff and Thomas & Hutton to determine next steps to get the project ready to go to bid once permits are in hand.
Phase 3 Drainage Update - March 2022
Tuesday, March 15, 2022

30th & 36th Avenue:

  • Start date for 30th Avenue outfall construction in early April
  • Golf course work completed by June
  • Waterway and 30th road work July – August
  • Waterway and 36th road work September – October

41st Avenue:

  • Wetland permit (OCRM and USACE) still pending. City has conditional approval from OCRM. All other permits are contingent on the wetland permit.
  • City received $1.4M grant from the SC Office of Resilience from CDBG-MIT funds for construction.
  • Mitigation – Most cost-effective option for the City is to purchase mitigation credits. Mitigation project evaluated would be more costly: construction, monitoring and ongoing maintenance.
Phase 3 Drainage Update - February 2022
Tuesday, February 15, 2022

30th & 36th Avenue:

  • Contract executed
  • Supply lead times are causing issues that will impact original schedule.
  • Steel wire mesh that goes inside the concrete pipes. Suppliers rationing steel.
  • Box culvert 6 month lead time. New start date for 30 th Avenue outfall construction in early April, golf course work completed by June, road work on Waterway July August.
  • Road work on the 36 th Avenue outfall between September-October

41st Avenue:

  • Wetland permit (OCRM and USACE) still pending. City has conditional approval from OCRM. All other permits are contingent on the wetland permit.
  • City received $1.4M grant from the SC Office of Resilience from CDBG MIT funds for construction.
  • Mitigation Most cost effective option for the City is to purchase mitigation credits. Mitigation project evaluated would be more costly: construction, monitoring and ongoing maintenance.
Phase 3 Drainage Update - January 2022
Tuesday, January 18, 2022

30th & 36th Avenue:

  • Contract with Quality Enterprise executed.
  • Supply lead times are causing issues that will impact original schedule.
  • Steel wire mesh that goes inside the concrete pipes. Suppliers rationing steel.
  • Box culvert - 6-month lead time
  • Staff is evaluating alternate schedule and materials. Meeting with Wild Dunes tomorrow to discuss alternate schedule that would minimize impact to golf course operations.

41st Avenue:

  • Wetland permit (OCRM and USACE) still pending. City has conditional approval from OCRM. All other permits are contingent on the wetland permit.
  • Mitigation – Most cost-effective option for the City is to purchase mitigation credits. Mitigation project evaluated would be more costly: construction, monitoring and ongoing maintenance.

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