2009-09-25_PERMIT FILE - M2009076 ‎(38)‎

• Permit No: M2009076
• IBM Index Class Name: PERMIT FILE
• Doc Date: 9/25/2009
• Doc Name: Ex. C- Mining Plan
• From: Venture Resources
• To: DRMS
• Media Type: D
• Archive: No

The EPA currently is doing extensive monitoring of ground water sources (as stated earlier, The Big Five Tunnel
drainage is monitored, collected, and pumped to the Argo Tunnel Treatment Facility located in Idaho Springs).
Proposed Point of Compliance:
For pre-existing, baseline quality of ground water beneath the proposed facility please refer to "Explanation of
Significant Differences Big Five Tunnel Discharge", attached at the end of this Exhibit C. The Big Five Tunnel is
within the vicinity beneath the proposed disposal area at a depth of approximately 1,100 feet. The condition of the
existing ground water (Table 1.0 in this publication) is significantly worse than the mill process water (see lab
analysis of proposed waste stream attached).
TABLE 1.0 ANALYTICAL SUMIARY TABLE BIG FIVE DISCHARGE SAMPLES
Metals concentrations cxpnemed in micrograms/Liter
Sampling Event As Cd Cu Hg Mn Pb Zu
1985 Pbase I RI 10 48 1710 NAF 19,700 91 9770
1989 Phase 11 RI 10 27 690 NAF 18,800 5 9100
2001 CDPHE NAF 24 1500 NAF 32,200 NAF 9160
2005UOSni 2 20 2960 0.1 191SO0 16 7610
State Drinking Water MCL

State Drinkia Water MCLG
State Steondary bd
A vatic Life NE4C/W 10

-
5 5
1

-
0.413 -

1300
100
517 2

-
0.01

-
50
1000/1493

15
-
412 -

-
S00
47/200
NAF - Not Analyzed For
MCL - Maximum Contaminant Level
MCLG - Maximum Contaminant Level Goal
NEC - No Effect Concentrations are metal concentrations at which aquatic life does not suffer any to=te effects
(1) UOS - START contractor for EPA's,BmeMeney Response Team
(2) WQCD - aquatic standards for Clear Creek Segment 2
In the event there is infiltration into the ¢roundwater table the net equality could only significantly improve.
A current sampling of the Big 5 Tunnel discharge also follows in this Exhibit C.
This sampling was done over a period of time from 1985 - 2009. It becomes apparent that the reported metals
concentration varies widely. Rationale for this can be explained by variation in rainfall amounts preceding the
sampling and the concentration of that rainfall in different areas of differing mineralization. This wide variability
can not be attributed to active mining operations because we are not aware of any within this drainage area over this
period of time.
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