Arsenic - well no. 10: concentration 11.^ microgram per liter (ug/L) 

 Copper - well no. 5: concentration 41 ug/L 



- well no. 7; concentration 48 ug/L 



- well no. 11; concentration 110 ug/L 

 Mercury - well no. 5; concentration .24 ug/L 

 Selenium - well no. 5; concentration 10 ug/L 

 Zinc - well no. 5; concentration 1,070 ug/L 



All uranium values were near detection levels in I982. 



Saskatciiewan 



Ground-water quality was determined in 14 of the 18 piezometers included in tiie 

 monitoring scliedule. The remaining four piezometers were dry at the time of 

 sampling (October). Scatter diagrams of concentrations plotted linearly against 

 time were used to interpret all available data. The following parameters showed 

 wide concentration variability in seven or more piezometers: specific conduc- 

 tivity, calcium, iron, arsenic, copper, aluminum, lead, zinc, color, and total 

 dissolved sol ids. 



Piezometer C712B (Station 2a in oxidized till) showed increasing trends from 

 seven parameters: barium, calcium, chloride, sulphate, strontium, uranium, 

 and vanadium. Piezometer C726B (Station 8a in mottled till) showed increased 

 concentrations for four parameters: barium, conductivity, manganese, and lead. 

 Piezometer C726E also showed increased concentrations for five parameters: 

 calcium, lithium, magnesium, total alkalinity and total hardness. These three 

 piezometers are located next to the ash lagoons and the changes may be due to 

 seepage. However, the values fluctuate too much to allow any conclusion to be 

 made at this time. 



The question of sampling, analytical precision, and variability of the local 

 ground-water quality was raised by the Poplar River Bilateral Monitoring 

 Committee in its I98I Annual Report. A follow-up investigation by the 

 Saskatchewan Power Corporation was undertaken in 1982. The data are still 

 variable and it is not clear whether the results represent the natural state 

 of ground-water quality or are the result of problems in sampling handling, 

 or methods at the laboratories. It is proposed, therefore, that the Committee 

 conduct more investigations in I982 into the question of data variability. 



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