POPLAR RIVER BILATERAL MONITORING COMMITTEE 



Department of State 

 Washington, D.C., United States 



Department of External Affairs 

 Ottawa, Ontario, Canada 



Governor's Office 



State of Montana 



Helena, Montana, United States 



Saskatchewan Environment and 



Public Safety 

 Regina, Saskatchewan, Canada 



Ladies and Gentleman: 



During 1991, the Poplar River Bilateral Monitoring Committee continued to fulfil 

 the responsibilities assigned by the governments under the Poplar River 

 Cooperative Monitoring Arrangement dated September 23, 1980. Water quantity, 

 water quality, and air quality relevant to the International Boundary were 

 monitored in accordance with the 1991 Technical Monitoring Schedule. The 

 monitoring data were exchanged on a quarterly basis. 



This annual report is the eleventh of a series covering the period 1981-91. The 

 report summarizes environmental conditions in the basin and discusses Committee 

 activities for 1991. Conditions are compared to guidelines for specific 

 parameter values that were developed by the International Joint Commission under 

 the 1977 Reference from Canada and the United States. References are made to 

 State, Provincial, or Federal standards or objectives where these are relevant. 

 After examination and evaluation of the monitoring information for 1991, the 

 Committee finds that the measured conditions meet the recommended objectives. 



During 1991, monitoring continued with only minor changes in the schedules from 

 1990. Ash surcharging was implemented to reduce the need for building new 

 lagoops. 



In March 1991, the five-year extension of the Cooperative Monitoring Arrangement 

 expired. Steps were taken to extend the arrangement for another five years. 



Herein is the eleventh annual report of the Poplar River Bilateral Monitoring 

 Committee. 



Yours sincerely. 



J./R. Knapton / 



Chair, United States Section 



R. A. Halliday V 

 Chair, Canadian Section 



7/ , / 



A. Wittich 



Member, United States Section 



/. 



D. D. Nargang 



Member, Canadian Section 



