2009-08-10_GENERAL DOCUMENTS - M1977300 ‎(2)‎

• Permit No: M1977300
• IBM Index Class Name: GENERAL DOCUMENTS
• Doc Date: 8/10/2009
• Doc Name: EPP- pgs. 9-30 to 11-10
• From: Whetstone Associates/Cotter Corp.
• To: DRMS
• Permit Index Doc Type: Gen. Correspondence
• Email Name: DB2
• Media Type: D
• Archive: No

Environmental Protection Plan, Schwartzwalder Mine 11-8
Table 11-5. Surface Water Quality Sampling Stations From the 1998-1999 Baseline
Hydrology Study
STATION NORTHING EASTING ELEVATION :DESCRIPTION
SW-LLHG 726,873.63 2,.065.,66.1.22 6155..00
... :Lon Lake Head Gate (1.5 miles downstream)
......, ......................... .
SW-BPL 732,105.23 2,063.,06.8.76 6508.97
....................................... . ........................... :Below Pro...... erty Line
...... i ................................................. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (near MW8)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SW-GS
. .................................................. 73.2,466.73
. 2,062,546.19 : 6533.43

.... :Guard Shack

.............. ............................
......
........................... (near MW7)

..........................

-BOS
SW
..................................................................
732,696.77
...... ............................
2?
..................................................................... .....
1$
.................................... 6543...............60.................
.
Below Ore Sorter
.......................................................................................................... ......................................................
....
(near MW6)
.................................................................................................................
SW-OS
........................... .............. 732,902.10 2,062,1.02.41 6551.92 Ore Sorter

. ................................................................
........... (u....stream from Sum 3
.............................................. ................................ .P.. )..
SW-PL
..........
.............. ...... .............. ....... . 733,088 71
.:. . 2,061,744.42
.. ...................................................... 6563.94
_................................................................... ;Parking Lot
....................................... (near MW3A
................................................. )...
SW-BDIS 733 336.16
..........................................a 2,061,476.31
........._................._.................................... 6577.34
................................................................... Below Dischar e
.....:
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . ....... . .. . . . . . . . ........ . . . . . . . . . . .

. . . . . . . . . . . . . . . . . ................................................. . ..... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SW-A001
..................................................... 733..650.46
.......... .._........................................... 2,061,153.05 6590.57
... :Above Dischar a
..... ..... .........................................................g...... .................. (u.Pstream of culvert)
...................................... ....... ..... .... ..................................................
SW-UC

..................................................... 734,328.15

...:. ; 2,060,300.99

........._ ................_.................................... 6618.08

.................................................................. UPPer Culvert

......r......................................................................................
(u stream of culvert)
..............................................................................................................
SW-UP 735,102.33 2,059,153.21 6660.82 Upstream 01,200' E of prop. Boundarv)
(c) Ralston Creek Water Quality
Water in Ralston Creek upstream of the Schwartzwalder Mine is a calcium-bicarbonate type water, with
low levels of TDS (averaging 140 mg/L). Most metals are below detection at upstream monitoring stations
SW-UP, SW-UC, SW-AWD, and SW-A001 (Table 11-7, Appendix B). Uranium at upstream stations SW-
AWD and SW-A001 have never exceeded the water supply intake standard of 40 pCi/L or 0.059 mg/L
(Figure 11-7) or the instream aquatic toxicity standards.
Water quality in Ralston Creek changes with distance downstream of Stations SW-AWD and SW-A001, as
. the creek flows across the mineralized zone and past the property. The alluvium and fill near the mine site
affect TDS and metals concentrations in the creek. However, the applicable standards for uranium and
trace metals have seldom been exceeded, as shown in Table 11-6. Dissolved uranium has not exceeded the
chronic or acute hardness-based aquatic toxicity standards in any of 640 samples analyzed. Total mercury
exceeded chronic aquatic standards in one of 124 samples, dissolved iron in three of 197 samples, and total
iron in one of 114 samples. Total aluminum exceeded the chronic aquatic toxicity standard in 18 of 125
samples, while the acute standard was exceeded only twice.
Water quality in the creek has changed over time, as changes have occurred in discharge from the water
treatment plant, reclamation activities, sump pumping, and seasonal (low flow or high flow) conditions.
The changes in water quality over time are discussed in detail in Sections 11(c)(i) and I I(c)(ii) (during and
after operation of the water treatment plant, respectively).
•
18 Elevation is approximate (within 111) for station SW-130S
4109C.090807 Whetstone Associates