STPFN Wastewater Treatment Plant Upgrade and Expansion Project

The STPFN wastewater treatment plant upgrade and expansion project (the Project) consists of the repair/upgrade and decommissioning of wastewater infrastructure in the community, including:
 

• Constructing a new lift station (North Lift Station) installed approximately 10 m north of the
  North WWTP to service the north catchment area of STPFN and convey wastewater to the South
  WWTP.
• Installing a 250 mm diameter gravity sewer connecting the manhole of the North WWTP (MH
  79) to the North Lift Station.
• Decommissioning the existing Lift Station #4 and installing a new 200 mm diameter gravity sewer line (approximately 8 m in length) to convey wastewater flowing from the decommissioned lift station #4 to the North Lift Station.
• Installing a new 200 mm high density polyethylene (HDPE) forcemain (approximately 2.65 km in length) connecting the North Lift Station to existing gravity sewer at Manhole #8.
• Upgrading, repairing, and expanding the existing South WWTP, including construction of the
  expanded superstructure, new truck dump pad and manhole, installation/repairs to process and
  mechanical equipment, a new 300 mm gravity effluent overflow outfall discharging to rip rap
  east of the superstructure on the shore of Island Lake, and a new 375 mm gravity sewer line
  (approximately 60 m in length) to Manhole #4.
• Upgrading the sludge drying beds by draining away the liquid and hauling it to the South WWTP,
  allowing sludge to dry, pushing sludge into stockpiles, and re-grading the site to prevent accumulation of rain/snow.
• Upgrading (widening) and re-surfacing the access road to the sludge drying beds to
  accommodate truck turn around.
• Decommissioning of the North WWTP.

During operation, the WWTP treatment process produces sludge (56 m3/day at 0.85% solids) and treated wastewater effluent (40 L/s). Sludge will be de-watered using de-watering trailers and approximately 1.73 m3 /day of de-watered sludge will be hauled to the sludge drying beds on a regular basis (approximately every 7 days). Dried sludge will be hauled to the neighboring community landfill site, on an as-needed basis, to be used as interim cover material. Treated wastewater effluent will be discharged to Island Lake on a continuous basis through the existing discharge/outfall structure. General office waste will be sent to the local community waste disposal ground. The effluent will be monitored continuously to confirm it meets the effluent discharge criteria as described in the Wastewater Systems Effluent Regulations (2017). Should a flood event occur, the South WWTP will discharge wastewater overflows to Island Lake via a 300 mm gravity effluent overflow outfall as an emergency measure. During decommissioning of the North WWTP, STPFN may choose to retain the existing WWTP building for a future use as a storage facility. Sewage and liquid wastes from the North WWTP will be hauled to the new truck haul wastewater receiving station while the sludge would be disposed of at the sludge drying beds following dewatering. During decommissioning of Lift Station #4, sewage and liquid wastes will be hauled to the new truck haul wastewater receiving station. The internal infrastructure (piping, valves, pumps, etc.) will be removed and disposed of at the landfill. The control panel will be salvaged and handed over to STPFN to use as parts for the other lift stations in the community.