THIS EMERGENCY ADMINISTRATIVE ORDER ON CONSENT IS ISSUED TO PIONEER NATURAL RESOURCES CONCERNING CONTAMINATION OF AN UNDERGROUND SOURCE OF DRINKING WATER CAUSED BY AN OIL WELL KNOWN AS THE BIERE 1-22 WELL, WHICH IS LOCATED IN THE EAST POPLAR OIL FIELD ON THE FORT PECK INDIAN RESERVATION. THIS PRESENTS AN IMMEDIATE AND SUBSTANTIAL ENDANGERMENT TO THE HEALTH OF PERSONS RESIDING IN THE AREA. RESPONDENT IS ORDERED TO STOP THE BIERE 1-22 WELL FROM CONTAMINATING THE QUATERNARY DEPOSITS AQUIFER WITHIN 90 DAYS OF THE EFFECTIVE DATE OF THIS EAOC. PIONEER SHALL SUBMIT A WELL CONTAINMENT AND MONITORING PLAN.