2009-03-06_PERMIT FILE - C1981012A ‎(6)‎

• Permit No: C1981012A
• IBM Index Class Name: Permit File
• Doc Date: 3/6/2009
• Section_Exhibit Name: Exhibit 22 NPDES Permit
• Media Type: D
• Archive: Yes

New Elk Mine Water Quality Assessment
• Table A- 10
WQBELs, ADBACs, and N1Ls Sunnmar for Outfall OOlA
Existing New
Existing
Permtftgd New WQBEL ADBAC
Pollutant Permit Load WQBEL Load
Limit Rbs/dav)

As, TR (I
Cd, Dis
Cr, Tot
Cu, Dis
Fe, TR (1
IsDis
47
0.00027
1.8
0.07
0.004
4
18
12
6
158
2.11
34.5
2090
5.91
3078
0
116
1.7
0.222
391
CO-0000906
NIL
0
0
0
0
3500
0
0
0
0
O
0
0
00
0
The existing permitted load, the new WQBELs load, and the NIL were calculated using the
following equations:
0 0 1056
0 0 5.8
0 0 383
0 0 109
)0 251 9753
0 0 39.0
0 0 19312
0 0 0. I 1
0 p 739
0 p 28
0 0 1.5
0 0 1480
0 p 7.6
0 0 4837
~
n 0 2607
2.61
0.014
0.9
0.3
24
1.21
Existing permitted load = Mpermitted x Qpernuu ,l x 8.34
New WQBELs load = M2 X Q2 x 8.34
NIL =Existing permitted load _ Q2 - 8.34
Where,
Mpermitied = Existing permit limit or implicit permit limit as of September 2000 (mg/1)
Qpermitted = Design flow used in the existing permit as of September 2000 (mgd)
M2 = Maximum allowable discharge concentration (mg/1)
Q2 = Average daily effluent flow (design capacity in mgd)
For purposes of selecting the existing permit limit, :Ylpernitled, where more than one limit has been
established (e.g., a 30-day average limit and a daily maximum limit), the most stringent was used.
Similarly, when selecting the M2, where both chronic and acute allowable discharge concentrations
have been calculated, the most stringent was used.
In the interests of limiting tables to only those explicitly necessary, detailed calculations of the
existing permitted loads, proposed WQBEL loads and NILs are not provided. However, the values
Appendix A (wQA version 5-4(FASL)) Page 28 of 29 Last Revised August 26, 2008