1988-10-07_PERMIT FILE - C1981008A

• Permit No: C1981008A
• IBM Index Class Name: PERMIT FILE
• Doc Date: 10/7/1988
• Doc Name: Supplemental Salimity Loading Analyses for the Nucla and Nucla East Mining Areas Using the Q7-10
• Section_Exhibit Name: Tab 17 Appendix 17-2
• Media Type: D
• Archive: Yes

Table 17-2-5
Computations for Non-irrigation Season Impact Analyses for
Low Flow Mine Discharges and the Q 7-10 San Miguel Flow
I. Background Salt Contributions from Upstream San Miguel, Calamity Draw and Tuttle Draw
6.48 cfs x 1,240 mg/l + 1.75 cfs x 3,356 mg/l + 0.05 cfs x 2,079 mg/l
6.48 cfs + 1.75 cfs + 0.05 cfs
14,012.2
= 1,692 mg/l
8.28
Tonnage of Salt in San Miguel Below Tuttle Draw
8.28 cfs x 1,692 mg/l x .0027 = 37.83 tons/day
11. During Mining Impacts to the San Miguel from Nucla and Nucla East Via Tuttle and
Calamity Draws
6.48 cfs x 1,240 mg/l + 1.75 cfs x 3,356 mg/l + 0.59 cfs x 3,284 mg/l + 0.065 cfs x 4,493 mg/l
6.48 cfs + 1.75 cfs + 0.59 cfs + 0.065 cfs
16,137.8 = 1,815.3 mg/l
8.89
Tonnage of Salt in San Miguel Below Tuttle Draw During Mining
8.89 cfs x 1,815 mg/l x .0027 = 43.57 tons/day
Salinity Impacts During Mining
1,815 mg/l - 1,692 mg/l x 100 = 7.3% increase in TDS
1,692 mg/l
43.57 tons/day - 37.83 tons/day x 100 = 15.2% increase in salt load
37.83