Northwest Wastewater Treatment Plant/CR 2209 Utility Extension

Client: St. Johns County

The Northwest WWTP/CR 2209 Utility Extension project involved the design, permitting, and construction of a connection between the existing St. Johns County International Golf Parkway (IGP) Wastewater Pump Station (WWPS) and the new Northwest Wastewater Treatment Plant (WWTP). Wastewater generated in the World Golf Village and surrounding residential and commercial developments has been pumped to the International Golf Parkway WWPS where it is then re-pumped to the St. Johns County Utility Department (SJCUD) SR 16 WWTP for treatment and disposal. With development demands increasing, limited capacity of the SR 16 WWTP, and costs of pumping, SJCUD opted for a new WWTP north of International Golf Parkway on the future CR 2209.

ETM provided engineering design for the extension of approximately 5,000-linear-feet of 20″ D.I.P. force main from the International Golf Parkway pump station to the Northwest WWTP, approximately 5,500-linear-feet of 20″ D.I.P. reuse main from the Northwest WWTP to International Golf Parkway, and approximately 2,700-linear-feet of 20” D.I.P. outfall main from the Northwest WWTP to the wet weather discharge point connection point to the Box Culvert at Mills Creek.

After the plans were reviewed and approved by both SJCUD and the FDEP, we prepared the bid package. Once the contractor was selected, we assisted with shop drawing review, coordination, and contract administration. These utility mains were constructed by the Contractor in easements granted by the developer and within the CR 2209 right-of-way by open cut methods, with the exception of the 24″ HDPE reuse water main crossing of the IGP which was performed by horizontal directional drill.

Project permitting included FDEP, SJC, and SJRWMD. This project required special coordination between the land owner/developer, Northwest WWTP designer, FPL, and SJCUD. Roadway right-of-way and utility easements were established and potential conflict with future CR 2209 drainage structures were addressed in the design. We also produced construction drawings for a large triple 12’ x 8’ box culvert crossing at Mill Creek along with a 24’ wide stabilized roadway crossing over the culvert for future access.

Project management included budget control, schedule, management, coordination with primary stakeholders, and QA/QC. We also provided contract administration services to help ensure that the project was built correctly in a timely manner. On a periodic basis, we reviewed the construction in the field to ensure that the work was built in accordance with the contract documents and project specifications, and also coordinated with the contractor, the owner (SJCUD) and other agencies to help expedite the construction process and help with relocation of FPL power poles.