HYDRO21631

• Permit No: C1984063
• IBM Index Class Name: Hydrology
• Doc Date: 6/25/1992
• Doc Name: FINAL PERMIT COLO WASTEWATER DISCHARGE PERMIT SYSTEM CO-G-850019 EAST SIDE COAL CO INC
• From: CDOH
• To: STEPHEN SELF
• Permit Index Doc Type: NPDES
• Media Type: D
• Archive: No

PART I
Page 11
Permit No. COG-850000
B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
3. Monitorine Requirements
In order to obtain an indication of the probable compliance or
noncompliance with the effluent limitations specified in Part I.B. 1,
the permittee shall monitor all effluent parameters at the following
frequencies,
a) Active Mining Outfall(s)
Effluent Parameter MeasuremenC Freauencv ~ Sample Twe J

Flow, MGD Weekly Instantaneous
or Continuous
pH, s.u. Weekly Grab
Oil and Grease, mg/1 Weekly Visual J
Total Suspended Solids, mg/1 Monthly Grab
Total Iron, mg/1 Monthly Grab
Settleable Solids, ml/1 g/ Monthly Grab
Total Dissolved Solids, mg/1 J* Quarterly Grab
Total Phosphorus (as P), mg/1** Quarterly Grab
b) Post-Paining Outfall(s)
Effluent Parameter ~ Measurement Freauencv ~ Samole Tye d/

Flow, MGD Monthly Instantaneous
or Continuous
Settleable Solids, ml/1 g/ Monthly Grab
Oil and Grease, mg/1 Monthly Visual J
pH, s.u. Monthly Grab
Total Dissolved Solids, mg/1 ~* Quarterly Grab
Total Phosphorus (as P), mg/1** Quarterly Crab
* Total Dissolved Solids (TDS) monitoring is required only for discharges to
the Colorado River Basin. See specific facility certification rationale
to determine whether TDS monitoring is required.
** Total phosphorus monitoring is required only for discharges to the Dillon
Reservoir drainage area (i.e., Ten Mile Creek, Snake River, Blue River,
and all other tributaries to the Dillon Reservoir) and for discharges to
the Upper Bear Creek drainage area. See specific facility certification
rationale to determine whether phosphorus monitoring is required.
See Part I.B,4, for footnotes