OSM Office of Surface Mining 



PCB Polychlorinated Biphenyl 



PCP Pentachlorophenol 



PER Preliminary Environmental Review 



ppb Parts per billion 



ppm Parts per million 



PRP Potentially Responsible Party 



PURPA Public Utilities Regulatory Policies Act 



PWA Public Works Administration 



RC&D Resource Conservation and Development 



RI Remedial Investigation 



RI/FS Remedial Investigation/Feasibility Study 



RIT Resource Indemnity Trust 



RM River Mile 



ROD Record of Decision 



SBC Silver Bow Creek 



SC Specific Conductance 



SCS Soil Conservation Service 



SHWB Solid and Hazardous Waste Bureau 



STARS Streambank Tailings and Revegetation Study 



SWCB State Water Conservation Board 



TSS Total Suspended Sediment 



ug/g Micrograms per gram 



ug/1 Micrograms per liter 



UM University of Montana 



USDA United States Department of Agriculture 



USES United States Forest Service 



USFWS United States Fish and Wildlife Service 



uses United States Geological Survey 



VSS Volatile Suspended Sediment 



WETS Western Fish Toxicology Station 



WPA Works Progress Administration 



WQB Water Quality Bureau 



WWP Washington Water Power Company 



WWTP Wastewater Treatment Plant 



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