PERMFILE134943

• Permit No: C1980007
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: Exhibit 47 Appendix F
• Media Type: D
• Archive: No

COLORADO DEPARTMENT OF HEALTH
,Water Ouali[y Control Division -
Re[ionale - Page 12
• Permit 'Jo.: CO-0038776
V. EFFLUENT LIMITATIONS FDR THE INDUSTRIAL WASTEWATER
DISCHARGE POINTS: (con['d.)
•
Weekly monitoring will 6e required for flow,
pH and oil and grease as discussed on page 9
of the permit. Salinity monitoring frequency
as discussed on page 9 is based on [he stale
salinity regulations.
NSPSlimitations for TSS will be used in lieu
of state effluent standards for 001, 002, C03,
004, 005. 006 and 008, based on WQCC
regulation 10.1.3 (3) which states that
technology based federal limitations will be
used instead of state effluent standards.
For totali'ron, NSPS limitations are chosen
instead of water quality standards for the
following reason. Because the ponds discharge
only in response to precipitation events or
snowmelt, receiving stream flow would be
above the Q7 0 level (33.0 cfs), it is
felt that NSP~ for total iron would protect the
in-stream water quality standard because
adequate dilution would 6e provided by the
stream at~times of precipitation or snowmelt
runoff.
Should a continuous discharge develop from 001
or 002 as tho result of mine drainage, this permit
may be reopened and modified pursuant to Part
11,8.(a)(V), page 23 of the permit. Information
ohtained to date indicates a non-continuous
discharge for 001 and 002, The non-continuous
discharge is the basis of the effluent
limitations for 001 and 002.
Monitoring for total iron and TSS will be one
grab sample per month. This is a reasonable
frequency to check on technology based
limitations which [he ponds are designed to
maintain. Weekly monitoring will be required
for flow, pH and oil and grease as discussed
on page 4 of the permit. Salinity monitoring
frequency as discussed on page 9 is teased on
the state salinity regulations.
U