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

~i
COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division
Rationale - Page 17. Permit No. CO-0024562.
2. Reporting: Pike's Peak MSn1ng Co. must submit a Discharge
Monitoring Report (DMR) on a monthly basis to the Division. This
report should contain the required summarization of the test
results for parameters shown in Table VI-3 and Part I.B.1 of the
permit. See the permit, Part I.B.2 for details on such submission.
3. Additional Monitoring and Reporting:
A. Mining Impacts to the Roosevelt Tunnel: In the event of
resumed mining activities in the Carlton Tunnel, the permittee
shall observe for any discharge from the Roosevelt Tunnel to
determine whether the activity has any impact on the Roosevelt
Tunnel drainage area. If any impact is observed, the permittee
shall immediately apply fora discharge permit for the Roosevelt
Tunnel drainage.
B. Low Flow Determination: Instream monitoring requirements
are being added to verify the assumptions made for determining
the effluent limitations in this permit. The permittee has the
option to either develop and implement a monitoring plan or to
install a gauge upstream from the discharge to measure flow. If
the permittee chooses to perform a monitoring study, the three
(3) year study plan should include, at a minimum: a
determination of variability on a daily basis by measuring flow
over the period of a day for at least five (5) days during the
study period, a determination of variability over a week by
measuring flow daily over the period of a week for at least one
summer and one winter week during the study period, a
determination of variability over a month by measuring flaw
weekly for at least six (6) months (if variability is seen,
weekly flow measurements should be taken for the entire study
period). The final monitoring location and the study plan or
the location of a gauge shall be submitted to the Division in a
facility diagram within 180 days of the permit effective date.
C. One-Time Analysis: In the event of resumed mining activity
in the Carlton Tunnel, the permittee shall conduct a one-time
analysis of the discharge far Potentially Dissolved Arsenic,
Trivalent Chromium, Hexavalent Chromium and Nickel, and for
Total Recoverable Iron and Manganese. The Division may impose
additional monitoring and/or effluent limitations based on the
results of this analysis.
C. Additional Terms and Conditions
1. Materials Containment Plan: On October 2, 1986 the permittee
submitted an engineered spill plan. An update to the plan is
required to be filed within 90 days of the permit effective date,
detailing all changes which have occurred since the original
submittal. If no changes have occurred, a letter to this effect is
required. For specific requirements, refer to Part I.E of the
permit.