PERMFILE67692

• Permit No: C1982056
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 49 PHC Modification Support Tables
• Media Type: D
• Archive: No

Table E49-20
Impacts to Receiving Streams, SAR -Case 2
Mine discharges (max. loading)
max
use w/tuy max.
Flow ~ TDS ~ Conduct. I Sodium i Calcium i Magnes. SAR I Year
Mean Flow Dry Year Flaw
Estimated Baseline (Exhibit 32) Flow Sodium Calcium ; Magnes. ; SAR Flow ; Sodium ; Calcium ; Magnes.; SAR
ds mg/L mg/L mglL cfs mg/L mg/L m /L
Trout Creek, above Fish Creek 46.4; 20.1 ~ 58.3; 28.Bj 0.5 16.5; 71 37;
- 161
- 0.2
Fish Creek above conB. W/Trout 26.0; 44.5; 60.8; 37.7; 1.1 6.9; 66; 90- 34~
r 1.5
Trout Creek below Fish Creek 72.4; 28.91 59.21 32.01 0.8 23.4; 24.31 52.4; 21.21 0.7
Predicted Values
Combined 109 + 115 Load Maximum
Trout Creek, above Fish Creek 47.2; 33.2j 61.1; 31.5[ 0.9 17.3; 43.51 45,5 23.9 7.3
Fish Creek above cen8. WI Trout Creek 26.7; 84.0; 65.71 40.2; 2.0 7.51 204.1 ; 104.9; 43.3; 4.2
Trout Creek below Fish Creek 73.8; 51.61 62.81 34.7; 1.3 24.8 ; 92.2 ; 63.51 29.8. 2.2
f 09 et indivrdua! Load Maximum
Trout Creek, above Fish Creek 47.2; 30.71 60.4; 30.91 0.8 17.31 36.51 43.51 22.31 1.1
Fish Creek above con0. WI Trout Creek 26.7; 60.0; 65.11 39.91 1.9 7.51 190.0; 102.7; 42.1; 4.0
Trout Creek below Fish Creek 73.8; 48.51 62.1; 3434 2 1.2 24.9 ~ 82.8; 61.3; 28.2; 2.2
'9
b
~J
'~;
R}
q
0
N
0
0
TR 99J]
Mine Discharge Data Flow & conductivity from estimated future water balance. TDS calculated from conductivity: TDS = 0.75 • cond.
except for conductivities greater than 5000 umhos/cm TDS = 0.84' cond.
Cations for 709 from 3!30/99 analysis of 6 Right inflow, lower values prorated from TDS value
Cations for 115 from 2/8/99 analysis, lower values prorated from TDS value
Baseline data Mean and low flow rates taken from Exhibit 32
Low flow water cations from Table 63
Mean flow cations for Trout Creek upstream 8 Fish Creek are mean values of pre-1984 data for sites 69 and 1003
Mean Flow cations for Trout Creek downstream are calculated from Troul Creek upstream and Fish Creek values
Predicted values calculated using mass balance equation shown in text (2.05.6(3)(b)(iii) Probable Hydrologic Consequences, Surface
Water Systems, Impacts of Mine Water Discharge)
Example: Fish Creek above con8. W(frout Creek, 109+115 max =
[[0.67(Flow,)•258(Ca,)]+[26.0(FlowZ)•60.8(Ca2)]]/26.7(Flow„J = 65.7
SAR = (Na • 0.0435) I{ [(Ca • 0.0499) +(Mg • 08226)]"0.5}
Table E49-20

17/15/99