HYDRO27950

• Permit No: C1981047
• IBM Index Class Name: Hydrology
• Doc Date: 3/8/1988
• Doc Name: CDPS GENERAL PERMIT FOR COAL MINING FACILITIES SURFACE RUNOFF ONLY AUTHORIZATION TO DISCHARGE UNDER
• Permit Index Doc Type: NPDES
• Media Type: D
• Archive: No

PART I
Page 7
Permit No. COG-850000
l J
B. EFFLIIENT LIMITATIONS AND MONITORIIQG REQIIIBII~II+N7.5
2. Monitoring 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 follo~ri.ng
frequencies.
(a) Active Mining
Effluent Parameter Measurement Frequency d/ Sample Type e/
Flow, MGD Weekly Instantaneous
or Continuous
Total Suspended Solids, mg/1 Monthly Grab
Total Iron, mg/1 Monthly Grab
Settleable Solids, ml/1 h/ Monthly Grab
011 and Grease, mg/1 Weekly Visual f/
pH, s.u. Weekly Grab
Total Dissolved Solids, mg/1 $/* Quarterly Grab
Total Phosphorus (as P), mg/1** Quarterly Grab
• (b) Poet-Mining
Effluent Parameter Measurement Frequency d/ Sample Type e/
Flow, MGD Monthly Instantaneous
or Continuous
Settleable Solids, ml/1 h/ Monthly Grab
011 and Grease, mg/1 Monthly Visual f/
pN, s.u. Monthly Grab
Total Dissolved Solids, mg/1 $/* Quarterly Grab
Total Phosphorus (as P), mg/1** Quarterly Grab
* Total Dissolved Solids 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,
all tributaries to the Dillon Reservoir). See specific facility
certification rationale to determine whether phosphorus monitoring is
required.
. See Part I.B.3. for footnotes