HYDRO21894

• Permit No: C1984063
• IBM Index Class Name: Hydrology
• Doc Date: 9/19/1997
• Doc Name: CERTIFICATION AUTHORIZATION TO DISCHARGE UNDER THE CDPS INDUSTRIAL GENERAL PERMIT FOR COAL MINING
• Permit Index Doc Type: NPDES
• Media Type: D
• Archive: No

PART I
Page No. 13
Permit No. COG-850000
D. GENERAL MONITORING, SAMPLING AND REPORTING REQUIREMENTS
2. Reoortine - Stormwater Annual Report (continued)
Eolorado Department of Public Health and Favironment
WQCD-PE-B2
4300 Cherry Creek Drive South
Denver, CO 80222-1530
3. Representative Samoline
Samples and meazurements taken az required herein shall be representative of the volume and stature of the monitored
dischazge. All samples shall be taken az the monitoring points specified in this permit and, unless otherwise specified,
before the effluent joins or is diluted by any other waztatream, body of wazer, or substance. Monitoring points shall
not be changed without notification to and approval by the Division.
[f the permittee monitors at the point of discharge any pollutant limited by the permi[ more frequently than required by
the permit, using approved tat procedures or az specified in the permit, the result of this monitoring shall be included in
the calculation and reporting of data to the Division.
4. Analvtical and Samoline Mdhods [or Monitorine
The permittee shall install, calibrate, sue and maintain monitoring methods and equipment, including biological and
indicated pollutant monitoring methods. All sampling shall be performed by the permittee according to specified
methods in 40 CFR Part 136; methods approved by EPA pursuant to 40 CFR Part 136; or methods approved by the
Division, in the absence of a method specified in or approved pursuant to 40 CFR Part 136. The analytical method
selected for a panmder shall be the one that can measure the lowest ddected limit for that paramder unless the
permit limitation or sttram standard for those patamders not limited, is within the testing range of another
approved method. When requested in writing, the Division may approve an alternative analytical procedure or any
significant modificazion to an approved procedure.
When the most sensitive analytical method which complies with this pan, hoc a detection limit greater than or equal to
the permit limit, the permittee shall report 'less than (the detectable limit),' az appropriaze. Such reports shall no[ be
considered az violations of the permit limit. ,
The method detection limit for ~++'~n~*ing settleable solids tinder this part shall be 0.4 mt/P.
5. Records
The permittee shall establish and maintain records. Those records shall include the following
a. The date, type, enact location, and time of sampling or meazuremeats;
b. The individual(s) who performed the sampling or meazuremwts;
c. The date(s) the analyses were performed;
d. The individual(s) who performed the analyses;
e. The analytical techniques or methods used;
f. The results of such analyses; and
g. Any other observations which may result in an impact on the quality or quantity of the dischazge az indicated in 40
CFR 122.44 (I)(1)(iii).
The permittee shall retain for a minimum of three (3) years records of all monitoring information, including all original
strip chart recordings for continuous monitoring instrumentalion, all calibration and maintenance records, copies of all
reports required by this permit and records of all data used to complete the application for this permit. This period of
retention shall be extrnded during the course of any unresolved litigation regazdiag the discharge of pollutants by the
permittee or when requested by the Division or EPA.