CSA50 - Shamattawa First Nation Water Treatment Plant and Watermain Distribution Upgrade

The Shamattawa First Nation is proposing the construction and operation of a water treatment plant (WTP) expansion and watermain distribution upgrade that serves the community. The existing water treatment and distribution systems were initially constructed approximately 20 years ago and are nearing the end of their design life. Additionally, the facilities have also experienced maintenance and operational challenges during the service lifetime that need to be addressed. The planned construction start date is January 2021 and expected substantial completion is March 2022. The expansion and upgrades to the existing WTP are intended to meet the community’s potable water requirements for a design horizon year of 2040. The proposed water treatment plant expansion is located in the south end of the community along Main Street and includes a new below grade water storage reservoir as foundation and sub-structure for a new building expansion. The existing 150 mm gravity drain line leading back to the river will be upgraded with a new 200 mm gravity drain. The existing raw water intake building (pump house) is located along the Gods River approximately 250 m from the treatment plant. The new pump house will be located approximately 500 m upstream of the current pump house location. The new pump house will be located approximately 15 m from the Echoing River shoreline and will include a single 250 mm diameter intake pipe and screen, with infrastructure in place for a future additional intake pipe and redundant intake screen. Twin 75 mm diameter high-density polyethylene (HDPE) airburst lines will run along the intake pipe to blow coarse air bubbles to scour the intake screen from sediment buildup and general fouling. Three vertical turbine low lift pumps in pump cans will supply raw water to the WTP.