HYDRO24194

• Permit No: M1980244
• IBM Index Class Name: Hydrology
• Doc Name: AMENDMENT 1 RATIONALE CRIPPLE CREEK & VICTOR GOLD MINING CO A JOINT VENTURE BETWEEN PIKES PEAK MININ
• Media Type: D
• Archive: No

~~ • ~~ •
COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division
Rationale - Page 11. Permit No. CO-0024562.
3. Re ulations for Effluent Limitations: The Regulations for Effluent
Limitations (10.1.0 , apply to the conventional pollutants. For
this facility the limitations for TSS, pH, and 031 and Grease are
based on this regulation.
4. Discussion of Limitations:
Limits for Silver (Ag), Zinc (Zn), Lead (Pb), and Copper (Cu):
Limits for these parameters are based on calculated WQS until
there is any mining activity in the Carlton Tunnel since the
federal regulations (40 CRF 440.103) do not apply for inactive
mines. In the event of active mining, the standard based limits
for Zinc, Lead and Copper are more stringent than the federal
regulations, so these limits are used.
Limits for Mercury (Hg) and Cadmium (Cd): As long as there is
no active mining in the Carlton Tunnel, no effluent limits will
be imposed for Mercury and Cadmium because the federal
regulations (40 CFR 440.103) do not apply for inactive mines and
there has been no Mercury or Cadmium above detection limits
during the life of the previous permit. The effluent limits
calculated for both of these parameters are well above the
detection limit (Mercury: chronic limit 0.03 mg/1, detection
limit 0.000025 mg/1, Cadmium: chronic limit 0.0248 mg/1,
detection limit 0.005 mg/1). If mining activity resumes at the
Carlton Tunnel, effluent limits for Cadmium and tdercury will be
imposed. Cadmium limits will be derived from WQS and Mercury
will be the BPJ limit from the federal regulations.
Limits for Arsenic (As), Iron (Fe), Manganese (Mn), Trivalent
Chromium (Cr IV Hexavalent Chromium Cr VI , Nickel (Ni):
Historic data and the analysis provided in the renewal
application for Arsenic are below detection. As in the case of
Cadmium above, the calculated limits for Arsenic is above the
detection limit. For each of the other metals, the historic
data and recent analytical data provided show concentrations
significantly below the effluent limits calculated for this
permit. For example, the most recent analysis for Nickel in the
effluent was 0.01 mg/1 and the acute effluent limit is 0.469
mg/1. A similar review was done for Iron, Manganese, and
Chromium. None of these parameters have been limited in the
previous permit and no additional monitoring requirements or
limits are beic~a, added to this permit for any of these
parameters. When mining activity is resumed, a new analysis of
these parameters will be required and the need for effluent
limitations or monitoring will be reevaluated.
5. Whole Effluent Toxicity (WET) Testing Outfalls 001 and 002: For
this facility, acute and chronic WET testing are required. (See
Parts I.A and I.B of the permit.)