2011-09-26_PERMIT FILE - C1981012 ‎(24)‎

• Permit No: C1981012
• IBM Index Class Name: Permit File
• Doc Date: 9/26/2011
• Section_Exhibit Name: EXHIBIT 08 HYDROLOGY AND GEOLOGY 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/1) and Absolute Change io Value
Low Flow Mean Flow
Average (5 cfs) (20 cfs) Mean
Chemical Concentration at WWL Original WWL Original Concentration
Constituent Stonewall Projection Projection at P1tS-3 PF:S-3 11/93'
HCO~ 119 ISS 12.7 211 170
Ca 38 36 37.8 47 44
CI 1.4 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 L4 1.65 L47 1.1 1
Na 9.0 29 14.3 13.6 9
SO, 36 45 38.3 34.8 27
TDS 166 213 179 213.7 210
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/1) and Absolute Change in Value
Low Flow (4 cfs) Mean Flow (20 cfs)
Average
Chemical Concentration
Constituent at Stonewall Current Life of Mine Current Life of Mine
HCO~ l l9 199(+80) 234(+115) 136 (+17) 145 (+26)
Ca 38 35(-3) 33(-5) 37.3(-.7) 37(-1)
CI 1.4 3.21(+L81) 4.0(+2.6) I.8(+.4) 2(+.6)
F 0.3 0.84(+.54) LI(+.8) 0.4(+.1) 0.48(+.18)
Fe 0.44 0.67(+.23) 0.77(.33) 0.5(+.6) 0.52(+.OS)
Mg 7.4 6.8(-.6) 6.6(-.8) 7.3 (-.1) 7.22(+.18)
Mn 0.012 0.02(+.008) 0.02(+.008) 0.01(-.002) 0.01(+.002)
K l.4 1.53(+.13) 1.58(+.IS) 1.43(+.03) 1.44(+.04)
Na 9.0 50(+.41) 69(+60) 18(+9) 22.6(+13.6)
SO, 36 35(-1) 34.5(-i.5) 35.8(-.2) 35.7(+.3)
TDS 166 382(+216) 479(+313) 213(+47) 237(+7l)
•
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Assumes mine dacharge = mint inFlnw m OAfi3 ch in 1993 and 0 %07 c(s for the life of mme. Quality is
bawd on maximum lever observed in the Golden Eacle Mine JiscF.arge, with the encepunn nl chloride, for
u hich the mcan u'as uscd.
Flow nl 13.13 cf'..