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 E49-24
• Site 115 Discharge Rate Calculator -Sample Results
for Maintaining Sulfate at or below 250 mg/L in Trout Creek below Fish Creek
C„ Conductivity, Baseline Instream (Site 1005)
Q~ Flow Rate, Baseline Instream (Site 1005)
Cs Conductivity, Site 109 discharge (3900 umhos/cm)
Q9 Discharge Rate, Site 109 (342 gpm)
Ca Conductivity, Site 115 discharge
Qa Discharge Rate, Site 115
Cr Conductivity, instream (Site 1005)
Qes Qe + Qs
Qd = (C~`Q~) (Qs`Cs) - (Cr Q~) - (C'T`Q9)
Cr - Ca
For calculated instream sulfate: sulfate =conductivity' 0.32
•
Trout Creek Belo Trout Creek Below
Fish Creek Fish Creek
Site 11 5 Baseline with site 115
Gte Ce Q„ C„ Qas + Q„ CT
Case Discharge Cond. Disch. ; Cond. Disch. ~ Cond. ;Sulfate
Cfs gpm I umhos/cm cfs I umhos/cm cfs I umhos/cm I mg/L
Baseline mean flow, 0.67 300 I 7300 72.4 527 73.1 I 631 202
Case 1 high load
,
Baseline low flow, Case 0.6 7 I 300 I 7300 23.4 I 560 24.1 I 874 280
1 high load
I
_ '
Low flow 1997, Case 1 0.67 I 300 I 7300 20.7 741 21.4 I 1089 ~ 348
high load
Ave. cond. 1997, Mean 0.67 300 ~ 7300 31.6 ~ 689 32.3 920 - 295
flow, Case 1 high load I I
1997 mean cond., Case 1.34 600 7300 46.0 527 47.3 783 - 251
1 high load
7
-
0
6
~ I
Hypothetical -Case 1, 0.6 30
I 3900 5 689 56.3 781 250
1999 -Flow Required
Hypothetical -Case 1, 1.34 I 600 3100 66.6 6 9 68.0 781 ~ 250
high load -Flow Req. I
Baseline: Flow and TDS from Exhibit 32. TDS converted to conductivity:
Condcuctivity =TDS '0.75
1997 Data: 1997 Annual Hydrologic Report
• Hypothetical Instream sulfate set at 250 mg/L and discharge rate calculated to
to achieve set instream (w/o Mine discharges) flow rate
TR 9932
Table E49-24
11/15199
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