2010-08-10_REVISION - C1981008 ‎(13)‎

• Permit No: C1981008
• IBM Index Class Name: Revision
• Doc Date: 8/10/2010
• Doc Name: Response 4 Revised Section 2.05.6‎(3)‎
• From: Western Fuels-Colorado
• To: DRMS
• Type & Sequence: PR6
• Media Type: D
• Archive: No

TABLE 2.06.6.(3) -4
Flow Rates vs. TDS for Spoil Waters and Receiving Streams
The values for the NPDES 001 Discharge and SW -N3 are averaged from measurements made
from 1993 to present. Table 2.05.6(3) -3 shows this information for these as well as other sample
points.
As is seen from the table, the spoil water inflows from both mine areas influence the quality of
Tuttle Draw to a minor degree. However, within 4500 feet, this flow enters the San Miguel River
where the flow is so much larger than the Tuttle Draw flow that the impact is negligible. During
REVISED August 2010 2.05.6(3) -40
Irrigation -
Sept/Oct
No Irrigation -
March /April
#1 Mine Spoil Water (NPDES 001 Discharge) TDS
1967
2885
#1 Mine Spoil Water (NPDES 001 Discharge) Flow CFS
.376
.041
Tuttle Draw #1 Mine Pre -Mix Point (SW -N3) TDS
1680
2094
Tuttle Draw #1 Mine Pre -Mix Point (SW -N3) Flow CFS
2.3
0.8
Tuttle Draw #1 Mine Post -Mix Point TDS(calculated)
1720
2133
Tuttle Draw #1 Mine Post -Mix Point Flow CFS (calculated)
2.676
0.841
#2 Mine Spoil Water TDS (4% above #1 Mine Levels)
2045
3000
#2 Mine Spoil Water Flow CFS (worst case)
1.31
.113
#2 Mine Spoil Water Flow CFS (realistic case)
.68
.113
Tuttle Draw #2 Mine Pre -Mix Point TDS (same as #1 Mine
Post -Mix)
1827
2235
Tuttle Draw #2 Mine Pre -Mix Point Flow CFS (same as #1
Mine Post -Mix)
3.986
0.954
Tuttle Draw #2 Mine Post -Mix Point TDS (calculated)
1881
2316
Tuttle Draw #2 Mine Post -Mix Point Flow CFS (calculated)
5.296
1.067
San Miguel River Pre -Mix Point TDS (Peabody Tab 17)
620
450
San Miguel River Pre -Mix Point Flow CFS (Peabody Tab
17)
141
817
San Miguel River Post -Mix Point TDS (calculated)
666
452
San Miguel River Post -Mix Point Flow CFS (calculated)
146.30
818.07
The values for the NPDES 001 Discharge and SW -N3 are averaged from measurements made
from 1993 to present. Table 2.05.6(3) -3 shows this information for these as well as other sample
points.
As is seen from the table, the spoil water inflows from both mine areas influence the quality of
Tuttle Draw to a minor degree. However, within 4500 feet, this flow enters the San Miguel River
where the flow is so much larger than the Tuttle Draw flow that the impact is negligible. During
REVISED August 2010 2.05.6(3) -40