1987-12-01_PERMIT FILE - C1981017 ‎(188)‎

• Permit No: C1981017
• IBM Index Class Name: PERMIT FILE
• Doc Date: 12/1/1987
• Doc Name: Wastewater Discharge Permits
• Section_Exhibit Name: Chapter IV Appendix IV-C-1
• Media Type: d
• Archive: No

COLORADO DEPARTMENT OF HEALTH
Water Quality Control Division
Rationale - Page 5
PERMIT NUMBER: CO-0000396
EFFLUENT LIMITATIONS: Based on the comparisons outlined in Table 3,
the Table below shows the effluent limitations
for discharge points 00tfppd.,006A- hru`.018, the
sedimentation ponds. Effluent limitations
are based on the most stringent numbers that
are found in Table 3. However, in the case of
sedimentation ponds for surface runoff, the
iron limitations of 3.5/7. 0 mg/l will be
applicable. This limitation is used instead
of 1 . 0/2. 0 because the sediment ponds will
discharge in response to precipitation events
or snowmelt. During these times , the receiving
waters will be above Q7-10 values (zero for all
receiving waters) and thus there should be
sufficient dilution of the effluent to allow
instream water quality limitations 1 .0/2. 0 to
be met. As technology based limitations
dictate over SES when both apply, the TSS
limitation is 35/70 mg/l .
TABLE 4
EFFLUENT LIMITATIONS FOR DISCHARGE POINTS
001 and 006 - 018 "
Parameter Limitation Rationale
Flow N/A Monitoring
Total Iron (mg/1 ) 3. 5/7.0 BPT, 1/
Total Suspended Solids (mg/1 ) 35/70 BPT, 1/
Oil and grease (mg/1 ) <10. 0 SES
ph (su) 6. 5-9. 0 WQS
Salinity 2/ Monitoring Colorado River Salinty
Regulations
1/ Federal Best Practicable Control Technology for Coal Mines.
2/ See the Discussion and Special Conditions Section of this summary for a
further discussion of salinity.