HYDRO28880

• Permit No: C1984065
• IBM Index Class Name: Hydrology
• Doc Date: 9/29/1997
• 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 MONTfORING, SAMPLING AND REPORTING REQUIItEMENTS
2. Repor[in¢ - Stormwater Annual Report (continued)
Colorado Department of Public Health and Environment
WQCD-PE-B2
4300 Cherry Creek Drive South
Denver, CO 80222-1530
3. Representative Sampling
Samples and meazuremmu taken az required herein shall be representative of the volume and nature of the monitored
discharge. All samples shall be taken at the monitoring poinu specified in this permit and, unless otherwise specified,
before the effluent joins or is diluted by any other waztes[ream, body of water, or substance. Monitoring poinu shall
not be changed without notification to and approval by the Division.
If the permittee moni[ors at the point of discharge any pollutant limited by the permit more frequently than required by
the permi[, using approved tut procedures or az specified in the permit, the result of this motti[oring shall be included in
the calculation and reporting of data to the Division.
4. Analvtiral and Sampling Methods for Monitoring
The pennittee shall install, calibrate, use and main[ain monitoring methods and equipment, including biological and
indicated pollutant monitoring methods. All sampling shall be performed by the perrnittee according to specified
methods in 40 CFR Pan 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 Pan 136. The analytical method
selected for a parameter shall be Ute one that can measure the lowest detected limit for that parameter unless the
permit limitation or stream standard for those parameters 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 modification to an approved procedure.
When the most sensitive analytical method which complies with this part, haz a detection limit greater than or equal to
the permi[ limi[, the perprittce shall repon "less than (the detectable limit),' az appropria[e. Such reports shall no[ be
considered az violations of the permit limit.
The method detection limit for measuring se[[leable solids under this pan shall be 0.4 mf/P.
5. Records
The permittee shall establish and mainra;n records. Those records shall include the following
a. The date, type, exact location, and [ime of sampling or meaztuemenu;
b. The individual(s) who performed the sampling or measurements;
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 resulu of such analyses; and
g. Any other observations which may result in an impact on the quality or quantity of the discharge az indicated in 40
CFR 122.44 (I)(1)(iii).
The permittce shall retain for a minimum of three (3) years records of all monitoring information, including all original
strip than recordings for continuous monitoring instnrmentation, all calibra[ion and maintenance records, copies of all
reports required by this permit and records of all data used to complete the application for this permi[. This period of
retention shall be extended during the course of any unresolvcd litigation regarding the discharge of pollutants by the
permittce or when requested by the Division or EPA.