PERMFILE69285

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: 2.04.7 HYDROLOGY INFORMATION
• Media Type: D
• Archive: Yes

Most of the waters in the area are alkaline which, according to
Skogerboe, limits or reduces the solubility of heavy metals in
surface and groundwater.
Because of this phenomenon, heavy metal concentrations in surface
and groundwaters near or on the Colowyo mine permit area are not
expected to be significantly affected.
Samples of drainage water, i.e., leachate, were collected and
analyzed by VTN (1975) to show concentrations of water quality
constituents of concern as a result of mining in northwestern
Colorado. Table 5 presents this information. It is interesting to
note that these values are not significantly higher than the values
from the other wells sampled or from the surface water samples.
Turbidities (JTU's) are negligible, which is to be expected of
water seeping through a large filter. Iron is low with a value
less than 1.0 mg/1. The major ions are within the range of the
other samples analyzed.
Table 5 is representative of concentrations from water subject to
natural percolation, leaching, and contact with the floor materials
of the Streeter Mine. Water entering the Streeter Mine came from
surface runoff and traveled through cracks and fissures in the
fractured rock above the mine. It is likely water traveled and
leached through the strata in this manner for a long time prior to
mining in the Streeter Mine. Table 5 should be viewed as
concentrations that can be expected to develop over time as
leaching continues through the Colowyo spoils and concentrations of
minerals available to leaching. decrease. Considering the physical
condition and mineralogy of the spoils, the predicted effects of
the spoil would be a gradual increase in TDS and associated major
ions for a period of time, followed by a general and gradual
decrease in concentration back to ranges seen in background data
and Table 5.
2.04.7-23