TABLES 



Table 2.1 Water-Quality Objectives 5 



Table 3.1 Recommended Water-Quality Objectives and Excursions, 1999 Sampling 



Program, East Poplar River at the International Boundary 18 



Table 3.2 Water-Quality Statistics for Water Pumped from Supplementary 



Water Supply Project Wells Sampled at Site "C3" on Girard Creek 26 



Table 3.3 Water-Quality Statistics for Water Pumped from Soil Salinity Project 



Wells Sampled at the Discharge Pipe 27 



Table 3.4 Cookson Reservoir Storage Statistics for 1999 31 



Table 3.5 Streamflow Measurement Results for July 19,1999 34 



Table 3.6 East Poplar Water-Quality Measurement Results for August 24, 1999 35 



FIGURES 



Figure 3 . 1 Discharge during 1 999 Compared with the Median Discharge for 1 96 1 - 1 990 



for the Poplar River at the International Boundary 6 



Figure 3.2 Flow Hydrograph of the East Poplar River at 



the International Boundary 8 



Figure 3.3 Cumulative Volume Hydrograph of On-Demand Release 9 



Figure 3.4 TDS Concentrations for 1999 Grab Samples from East Poplar River 



at the International Boundary 1 1 



Figure 3.5 Three-Month Moving, Flow- Weighted TDS Concentration for 



East Poplar River at the International Boundary 1 1 



Figure 3.6 Five- Year Moving, Flow- Weighted TDS Concentration for East 



Poplar River at the International Boundary 13 



Figure 3.7 Daily TDS Concentration, 1982 to 1999, East Poplar River 



at the International Boundary 13 



Figure 3.8 Boron Concentrations for 1999 Grab Samples from East Poplar 



River at the International Boundary 15 



Figure 3.9 Three-Month Moving, Flow- Weighted Boron Concentration for East 



Poplar River at the International Boundary 15 



Figure 3.10 Five- Year Moving, Flow- Weighted Boron Concentration for East 



Poplar River at the International Boundary 16 



Figure 3.11 Daily Boron Concentration, 1982 to 1999 East Poplar River 



at the International Boundary 16 



Figure 3.12 Supplementary Water Supply 19 



Figure 3.13 Pumpage from Salinity Control Projects 20 



Figure 3.14 Drawdown for Hart Seam Aquifer as of December 1999 22 



Figure 3.15 Cone of Depression in the Empress Sands Due to the 



Salinity Projects as of December 1999 23 



Figure 3.16 Hydrographs of Selected Wells: Fort Union-Hart Coal Aquifers 24 



Figure 3.17 Hydrographs of Selected Wells: Alluvium and Fox Hills Aquifers 25 



Figure 3.18 Total Dissolved Solids in Samples from Montana Wells 30 



Figure 3.19 Cookson Reservoir Mean Daily Water Levels for 1 999 and Mean Daily 



Monthly Water Levels for 1981-1991 32 



-u 



