HYDRO21797

• Permit No: C1984062
• IBM Index Class Name: Hydrology
• Doc Date: 4/16/1990
• Doc Name: FINAL PERMIT- WASTEWATER DISCHARGE PN COG-850013
• From: CDOH
• To: CYPRUS MINERALS CO
• Permit Index Doc Type: NPDES
• Media Type: D
• Archive: No

•
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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division
Rationale -Page 4. PERMIT NUMBER: COG-850000
APPLICATION AND CERTIFICATION:
The owner, operator and/or authorized agent for a facility shall submit an
application as provided by the Water Quality Control Division. This application
will be evaluated utilizing the criteria outlined previously. If the general
permit is applicable to the applicant's operation, then a rationale will be
developed and the applicant will be certified under the general permit. The
rationale shall include the name and address of the contact person, a discussion
of compliance under any previous permit, if applicable, the receiving water for
the discharge, number of outfalls, a determination of the need for salinity
monitoring sad a statement of whether active mining or poet-mining limitations
apply to each outfall.
If after evaluation of the application, it is found that the general permit is
not applicable to the operation, then the application will be processed as one
for an individual permit. Every applicant will be of the Division's decision.
For an individual permit, 180 days will be required to process the application
and issue the permit. In this case discharge cannot take place until the permit
is issued and becomes effective.
Addition or deletion of a sedimentation pond/outfall will require separate
application, which will be subject to the 30-day time frame also.
If after evaluation of the application for an ezisting source with a valid
permit, it is found that the general permit is not applicable to the operation,
then the applicant will continue operation under the ezisting individual permit.
If a facility operating under the general permit encounters mine drainage or
other source not covered by this general permit, it will be necessary to apply
for an individual permit. Coverage will continue under the general permit until
issuance of the individual permit.
The general permit itself contains the effluent limitations and the monitoring
requirements for the authorized outfalls. The following tezt details the
rationale for the conditions of the general permit.
EFFLUENT LIMITATIONS:
Effluent limitations are based on State Effluent Standards (SES), State Water
Quality Standards (WQS), Federal Hest Practicable Control Technology (BPT), sad
Federal Best Available Technology Economically Achievable (BAT) or Federal New
Source Performance Standards (NSPS). Briefly, a new source is a facility or a
major alteration to a facility which was constructed after May 4, 1984. Tables
1 and 3 present a comparison of appropriate limitations (active mining/post-
mining respectively). Tables 2 and 4 show limitations selected as being the
moat stringent of those in Tables 1 and 3, with the ezception of Total Suspended
Solids (TSS). The reason for the selected TSS limitation Ss ezplained after the
tables. Some of the limitations shown in Tables 2 and 4 may be exempted under
certain conditions upon submission by the permittee and approval by the division
of specific proof. A detailed ezplanation follows the tables.