Understanding the legacy loads c phosphorus in the Fiddler treatment system and the factors that influence phosphorus mobilization and bioavailability and risk to the Great SIave Lake ecosystem

Regions: North Slave Region

Tags: physical sciences, water sampling, lake sediment, phosphorus

Principal Investigator: Goodwin, Brett (1)
Licence Number: 16704
Organization: Fleming College (Centre for Advancement of Water and Wastewater Technologies)
Licensed Year(s): 2020
Issued: Feb 27, 2020
Project Team: Gordon Balch

Objective(s): To understand the current concentrations of total phosphorus within sediments of the Fiddler's drainage area.

Project Description: This licence has been issued for the scientific research application No.4741.

The aim of this study is to understand the current concentrations of total phosphorus within sediments of the Fiddler's drainage area. Samples are being collected at 4 locations long the Fiddler's drainage and one location in Great Slave Lake at the outflow of Fiddler's into the lake. These locations have been chosen provide an indication of concentrations from the source to outflow and to determine if a spatial gradation exists. Where possible sediment samples will be collected at two different depths in an attempt to determine if phosphorus concentrations are greater in surficial layers (e.g., more recent) or deeper layers (e.g., legacy deposition). Surficial water samples will also be taken and compared to historical data to determine trends.

Sediment samples will be taken by either a SIPRE corer (allows the collection of frozen sediments), or a KB sediment corer (not frozen) and or an Ekman grab (for loose sediments). The choice of sampling equipment will depend on site conditions. It is anticipated that each sediment sample will be approximately 500 mL in volume. Three replicate samples will be taken at each of the 5 sample sites and where possible a surficial (<15 cm depth) and a deeper layer (15 to 30 cm depth) will be taken. One 2 L water sample will be taken at each of the sample sites.

The information generated from this investigation will be submitted to GNWT in a final culminating report. The sharing and communication of this report will be controlled by and the responsibility of the Government of Northwest Territories.

The fieldwork for this study will be conducted from March 2, 2020 to March 31, 2020.