PERMFILE50229

• Permit No: C1981013
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 06 HYDROLOGY INFORMATION
• Media Type: D
• Archive: No

Table 9
Comparison of WWL Predictions of Water Quality •
in the North Fork of the Purgatoire River
with Actual Monitoring Results
Change in Concentration (mg/p and Absolute Change in Value
Low Flow Mean Flow
Average (5 cfs) (20 cfs) Mean
Chemical Concentration at WWL Original WWL Original Concentration
Constituent Stonewall Projection ProjeMion at PRS-3 PRS-3 I1/93z
HCO~ ll9 l55 12.7 211 170
Ca 38 36 37.8 47 44
CI l.4 1.76 1.5 2.5 3
F 0.3 0.38 0.31 1.1 .3
Fe 0.44 0.41 0.43 <0.27 .15
Mg 7.4 7.1 7.3 9.2 9
Mn 0.012 0.012 0.012 0.22 9
K 1.4 1.65 1.47 1.1 I
Na 9.0 29 14.3 13.6 9
SO, 36 45 38.3 34.8 27
TDS l66 213 179 213.7 210
Table 10
Prediction of Golden Eagle Mine Discharge on Quality
of Water in the North Fork of the Purgatoire River
at Low Flow (4 cfs) and Mean Flow (20 cfs)'
Change in Concentration (mg/q and Absolute Change in Value
Law Flow (4 cfs) Mean Flow (20 cfs)
Average
Chemical Concentration
Constituent at Stonewall Current Life of Mine Current Life of Mine
HCOa 119 199(+80) 234(+115) 136 (+17) l45 (+2fi)
Ca 38 35(-3) 33(-5) 37.3(-.7) 37(-1)
CI 1.4 3.21(+1.81) 4.0(+2.6) 1.8(+.4) 2(+.6)
F 0.3 0.84(+.54) 1.1(+.8) 0.4(+.l) 0.48(+.18)
Fe 0.44 0.67(+.23) 0.77(.33) 0.5(+.6) 0.52(+.08)
Mg 7.4 6.8(-.6) 6.6(-.8) 7.3 (-.l) 7.22(+.18)
Mn O.Ol2 0.02(+.008) 0.02(+.008) O.OI(-.002) 0.01(+.0(12)
K 1.4 1.53(+.13) 1.58(+.18) 1.43(+.03) 1.44(+.04)
Na 9.0 50(+.41) 69(+60) l8(+9) 22.6(+13.6)
SO, 36 35(-I) 34.5(-1.5) 35.8(-.2) 35.7(+.:5)
TDS 166 382(+216) 479(+313) 213(+47) 237(+71)
•
•
' Assumes mine discharge =mine tn0ow ar 0.563 cfs in 1993 and 0.707 cfs for the life of mine Quality is
based on maximum levels observed m the Golden Eagle Mine discharge, with the ezcepuon of chloride. far
which the mean was used.
Flow of 13 13 c(s.