REP42616

• Permit No: C1981008
• IBM Index Class Name: Report
• Doc Date: 12/11/2001
• Doc Name: NUCLA NPDES PERMINT CO-0000213
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division
• Rationale - Page 7. Permit No. CO-0000213
DISCUSSION OF PERMIT LIMITATIONS AND CONDITIONS:
F. Salinity (Total Dissolved Solids) (continued)
It is a requirement of the regulation that the TDS level of each discharge
in the Colorado River Basin be evaluated for impact on the system.
Generally, the net impact of TDS to the basin from coal mining surface
runoff treatment facilities is negligible due to the intermittent nature of
the discharger.
In compliance with the above referenced Colorado River Salinity Regulations,
the permittee shall continue to monitor for salinity on a quarterly basis
at all discharge points. The Division has determined that monitoring for
total dissolved solids (TDS) shall be the method used to measure salinity.
G. Monitoring Frequencies and Reporting Requirements
For discharge points 001 and 006, pH, oil and grease and flow monitoring is
required by the permittee on a weekly basis. TSS, total recoverable iron,
and settleable solids are to be monitored monthly. Quarterly TDS monitoring
is required for all discharges to the Colorado River Basin in compliance
with the Colorado River Salinity Regulations.
• For post mining discharge points (002, 003, 004 and 005) pH, oil and
grease, flow and settleable solids must be monitored monthly. The Division
requires less frequent monitoring for post-mining discharges because no
activity takes place on site, and because reclamation, including
revegetation, has begun and therefore effluent quality should vary little.
Aa described earlier, the permittee is required to monitor all parameters,
regardless of whether precipitation exemptions are sought. To address
precipitation exemption conditions for any of the surface stormwater
discharge points, the permittee must submit an ezemption request and
supporting 'proof' with the monitoring data. The Division will approve or
deny the ezemption request. If denied, then the permittee will be ezpected
to meet the primary parameters (TSS and total iron for active mining,
settleable solids for post-mining). See Part I.B of the permit for
monitoring requirements.
Discharge monitoring reports (DMRs) will continue to be required to be
submitted on a quarterly basis. If no discharge occurred during the
quarter, the DMR should state "No discharge during this reporting period."
See Part I.C of the permit for additional requirements.
H. Materials Containment Plan
On January 16, 1989, the permittee submitted a Spill Prevention Containment
and Control Plan (SPCC Plan) to the Division for review. An update of this
. Materials Containment Plan is required to be submitted indicating any
applicable changes. The plan update shall address any changes to the plan
necessary to prevent and/or contain spills of any materials used, processed
or stored at the facility which, if spilled, would have a reasonable
probability of having a visible or otherwise detrimental impact on waters
of the State. This update is to be submitted within 90 days of the
effective date of the permit. Sec Part I.E of the permit.