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 E49-19
Impacts to Receiving Streams, SAR -Case 1
Mine discharges (max. loading) Flow TDS ;Conduct. ; Sodium s Calcium Magnes. SAR ~ Year
cfs mg/L ; umhos/cm; mg/L mg/L mg/L [
109 max. combined 0.76 3000 40001 8341 2301 1961 9.81 1999
115 max combined 8 individual 0.671 61001 73001 1620; 258; 139; 20.2; 1999
_
109 max. individual 1.361 23001 31001 6391 1761 1501 8.61 2014
115 value to use w/109 max. 0.12! 2900; 3900; 770! 123! 66; 13.9; 2014
M ean Flow Dry Year Flow
Estimated Baseline (Exhibit 32) Flow [ Sodium [ Calcium [ Magnes. ~ SAR Flow ~ Sodium [ Calcium [M agnes.. SAR
cfs mg/L mg/L mg/L cfs mg/L mg/L mglL
Trout Creek, above Fish Creek 46.4; 20.11 58.31 28.8; 0.5 16.51 7; 37; 161 0.2
Fish Creek above confl. W/Trout 26.0; 44.5; 60.8; 37.7j 1.1 6.9; 66;
- 90;
- 34; 1.5
Trout Creek below Fish Creek 72.4; 28.9; 59.21
, 32.0; 0.8 23.41 24.3 52.4; 21.2; 0.7
Predicted Values
Combined 109 + 115 Load Maximum
Trout Creek, above Fish Creek 47.2; 33.2; 61.11 31.5; 0.9 17.3; 43.51 45.5; 23.9; 1.3
Fish Creek above confl. W/Trout Creek 26.71 84.01 65.71 40.21 2.0 7.51 204.11 104.91 43.31 4.2
Trout Creek below Fish Creek 73.8; 51.6; 62.61 34.71 i.3 24.8; 92.21 63.Sj 92 8 2.2
109 at individual Load Maximum
Trout Creek, above Fish Creek 47.81 37.81 61.71 32.31 1.0 17.91 55.31 47.61 26.2 1.6
Fish Creek above confl. W/Trout Creek 26.1; 47.91 61.1; 37.8; 1.2 7.5; 72.7; 84.0; 32.11 1.7
Trout Creek below Fish Creek 73.81 41.41 61.51 34.3 1.0 24.91 61.6 59.61 28.5 1.6
a
b
b
~'
f'<37
f~
m
m
0
0
0
0
Mine Discharge Data Flow 8 conductivity from estimated future water balance. TDS calculated from conductivity: TDS = 0.75' cond.
except for conduclitivities greater than 5000 umhos/cm TDS = 0.84 'cond.
Cations for 109 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 far Trout Creek upstream & Fish Creek are mean values of pre-1984 data for sites 69 and 1003
Mean flow cations for Trout Creek downstream are calculated from Trout Creek upstream and Fish Creek values
Prediced 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 confl. W/Trout Creek, 109+115 max =
[[0.67(Flow,)'258(Ca,)]+[26.0(FIow2)'60.8(Ca2)]]/26.7(FlowTO~ = 65.7
SAR = (Na • 0.0435) /( [(Ca' 0.0499) +(Mg ' 08226)]^0.5}
TR 9392
Table E49-19
11/15/99