2011-08-18_HYDROLOGY - M1977306

• Permit No: M1977306
• IBM Index Class Name: HYDROLOGY
• Doc Date: 8/18/2011
• Doc Name: Colorado Discharge Permit System
• From: Water Quality Control Division
• To: Cotter Corporation
• Email Name: GRM
• Media Type: D
• Archive: No

PART I
A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
1. Effluent Limitations
2. Monitoring Frequency and Sample Type
PART I
Page 3 of 26
Permit No.: C00036251
Beginning no later than the effective date of this permit and lasting through the expiration date, the
permittee is authorized to discharge from outfalls: OO1A, OO1B, 002A, 002B and 002C.
In accordance with the Water Quality Control Commission Regulations for Effluent Limitations,
Section 62.4, and the Colorado Discharge Permit System Regulations, Section 61.8(2), 5 C.C.R.
1002 -61, the permitted discharge shall not contain effluent parameter concentrations which exceed
the following limitations specified below or exceed the specified flow limitation.
In order to obtain an indication of the probable compliance or noncompliance with the effluent
limitations specified in Part I.A, the permittee shall monitor all effluent parameters at the following
frequencies. Such monitoring will begin immediately and last for the life of the permit unless
otherwise noted. The results of such monitoring shall be reported on the Discharge Monitoring
Report form (See Part I.D.)
Self - monitoring sampling by the permittee for compliance with the monitoring requirements specified
above shall be performed at the following location(s): OO1A, OO1B, 002A, 002B and 002C.
If the permittee, using an approved analytical method, monitors any parameter more frequently than
required by this permit, then the results of such monitoring shall be included in the calculation and
reporting of the values required in the Discharge Monitoring Report Form (DMRs) or other forms as
required by the Division. Such increased frequency shall also be indicated.
Oil and Grease Monitoring: For every outfall with oil and grease monitoring, in the event an oil
sheen or floating oil is observed, a grab sample shall be collected, analyzed, and reported on the
appropriate DMR. In addition, corrective action shall be taken immediately to mitigate the discharge
of oil and grease. A description of the corrective action taken should be included with the DMR.
3. Salinity Parameters
In order to obtain an indication of the quantity of Salinity, measured as total dissolved solids (TDS),
being discharged from the site the permittee shall monitor the wastewater effluent. Self - monitoring
samples taken in compliance with the monitoring requirements specified below shall be taken at those
locations listed in Part I.A.2.
4. Special Conditions
a. Monitoring to Ensure Numeric Effluent Limits Can Be Met - Prior to the commencement of any
discharge, the treated effluent must be sampled using grab method for all parameters with a