TABLE 3-26, 



Potential 

 Source 



SUMMARY OF POTENTIAL GROUND WATER CONTAMINATION 

 SOURCES FOUND DURING THE SBC RI 



Type 



RI Findings 



Upper Metro 

 Storm Drain 

 (Parrot) 



Weed 

 Concentrator 



Buried Tailings 



Discharge of Process 

 Waters 



WWTP Vicinity 

 (Butte Reduc- 

 tion Works) 



Colorado 

 Tailings 



Buried Tailings 



Surface Tailings 



Subsurface material has 

 extreme levels of metals. 

 Ground water in, beneath, 

 and downgradient from 

 tailings is degraded. 



Not evaluated, but a po- 

 tential source, and may 

 have amplified problems 

 from buried tailings in 

 MSD area. 



No site-specific tailings 

 analysis. Ground water 

 beneath and downgradient 

 is severely degraded. 



Tailings have elevated 

 metals and contaminated 

 soils and ground water 

 beneath (MBMG data) . 

 Metals concentrations in 

 ground water increase 

 to the northwest. 



Anaconda 



Pole 



Treatment 



Ramsay Flats 



Surface Soil 

 Contamination 



Surface Tailings 



Fluvial Surface Tailings 

 Tailings along 

 SBC and CFR 



Surface soils have 

 extreme levels of 

 arsenic. Ground water 

 was not characterized. 



Tailings contain up to 60 

 times background metals. 

 Surface efflorescence 

 contains extreme concen- 

 trations of metals (up to 

 15 percent) . Underlying 

 shallow ground water is 

 degraded but, due to low 

 gradients and transinis- 

 sivity, does not move 

 away from the site signi- 

 ficantly. 



Tailings have elevated 

 metals. Ground water may 

 be locally affected but 

 no significant contamina- 

 tion was found. 



Source: MultiTech 1987a. 



3-106a 



