5.4 Groundwater Quality 36 



5.4.1 Saskatchewan 36 



5.4.2 Montana 38 



6.0 Cookson Reservoir 39 



6.1 Storage 39 



6.2 Water Quality 41 



6.3 Mercury In Cookson Fish 46 



6.4 Morrison Dam Inspection 48 



7.0 Ash Lagoons 49 



7.1 Operations 49 



7.2 Ash Lagoon Inspections 49 



7.3 Dyke Stability 50 



7.4 Lagoon Water Levels 51 



7.5 Lagoon Seepage Estimates 52 



7.6 Lagoon Water Quality 54 



7.7 Interceptor Trench 64 



7.8 Leachate Review 67 



7.9 Ash Surcharging 69 



8.0 Sewage Holding Pond 73 



8.1 Operations 73 



8.2 Pond Quality 73 



9.0 Air Quality 75 



9.1 Saskatchewan Environment and Public Safety 75 



9.2 SaskPower 77 



9.3 In-Stack Monitoring 78 



10.0 References Cited 79 



ANNEXES 



1.0 Cooperative Monitoring Arrangement A1-1 



Canada-United States 



2.0 Technical Monitoring Schedules A2-1 



3.0 Reports Reviewed A3-1 



4.0 Recommended Flow Apportionment A4-1 



5.0 Leachate Review A5-1 



6.0 Metric Conversions A6-1 



