PERMFILE116168

• Permit No: C1981019
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: Report Dated October 1979
• Section_Exhibit Name: Exhibit 07 Item 1 Ground Water Quality
• Media Type: D
• Archive: No

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( [4,3ter Quality
B:cogden and Giles (1978) reported the results of water qua L,ty
i
t analyses of samples collected in streams, springs and wells~oi
the Yampa River Basin in 1974 and 1975. Approximately 27 sam-
p:Les were collected in the vicinity of the Coloveyo :?ine. Ana-
r lyses conducted on the samples included bacteriolanalvses, trace
r
1 e]_ement analyses, common ions, temperature, and pH. Of these
analyses, the temperature in degrees Centigrade (°C) and specific
conductivity in micromhos/cm (mm':os) are listed is Tabie 1 oad
plotted in parentheses in Figure 1. The average specific con-
ductivity of the measurements made in streams during the 197,4-5
l
l period was 1,440 mmhos. This sampling included a majority of
( samples from Good Spring Creek and a few samples at the mouths
of Wilson and Taylor Creeks. The sampling also took place dur-

~ ing all seasons. The lowest reading was 700 mmhos in May, 1975
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on Taylor Creek and the highest was 2,600 mmhes in September,
1975 at the confluence of Taylor and h*ilson Creeks. The aver-
[ age specific conductivity measured in wells was 1,390 mmhos and
the range was almost as large as that for the surface water
samples, 720 to. 2,700 mmhos. It was not expected that the ground
water samples have such inconsistent quality, but an explanation
might be a variety of sources of caater to the yells which would
support the concept of a series of perched aq~~ifers.
({
L Water quality data was also collected at the three gauge sites
on Wilson, Taylor and Good Spring Creek between October, 1974
anti Dlarch, 1978. The minimum specific conductance measured caas
at the Good Spring Creek gauge in February, 1976', 750 mmhos,'and
S the maximum vras also measured at this gauge in February, 1978,
2,380 mmhos. The specific conductivity appears to be related
in a complex way to both the volume of flow and the time of
year. :9ith less than three years of data the correlation be-
tween these factors is uncertain. The main conclusions cvhich
L can. be drawn from these data are the confirmation of the general
alkalinity of the water and the recognition of the wide variabil-
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" ~~ Leonard Rice Consulting Waler Engineers. Inc.
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