3-6 Concentrations of Arsenic, Copper, 

 Lead, and Zinc in the Colorado 

 Tailings 3-32b 



3-7 Ranges of Metal Concentrations 



in Old Works Grab Samples 3-33 



3-8 Total Metal Averages of Warm 

 Springs Ponds 2 and 3 Bottom 

 Sediments 3-3 6 



3-9 Concentrations of Selected 



Contaminants in Anaconda RI/FS 



Transect Soil Samples 3-38a 



3-10 Metal Hazard Levels for the Helena 

 Valley near the East Helena CERCLA 

 Site 3-39 



3-11 Average Concentrations of Selected 



Metals in Floodplain Sediments 3-44 



3-12 Concentrations of Trace Metal 



Associated with Fine-Grained Bed 



Material in the Clark Fork 



and Major Tributaries 3 -4 7a 



3-13 Mean Concentration and 95 Percent 



Confidence Limits for Trace Elements in 



Surface Sediments from Clark Fork 



Reservoirs and Tributaries 3-49a 



3-14 Maximum Concentrations of Copper 

 and Zinc in Mainstem Clark Fork, 

 1970-72 3-59 



3-15 Water Quality Criteria for Key 



Parameters 3-65a 



3-16 Federal Drinking Water Standards for 



Public Water Supplies 3-65a 



3-17 Analytical Techniques Used for 



Heavy Metals Water Quality Analysis 3 -66a 



3-18 Summary of Characterized and 



Potential Sources of Contamination 



to Silver Bow Creek 3-67 



3-19 Sources and Effects of Nonpoint 



Source Pollutants 3-92a 



Xll 



