HYDRO22356

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 8/26/1997
• Doc Name: SENECA MINE COMPLEX NPDES PERMIT
• From: SENECA COAL CO
• To: DMG
• Permit Index Doc Type: NPDES
• Media Type: D
• Archive: No

PART 1
Page 16
Permit No. CO-0000221
C. DEF1NrI10N5 OF TERMS
"Acute Whole Effluent Toxicity' exists
which is lethal [0 50% of the test organ
100% effluent.
2. "Composite" sample is a minimum of
proportioned according to flow.
3. "Continuous" measurement, is a
measurements.
lever the LCD, which represents an estimate of the effluent concentration
in the time period prescribed by the test, is found to be less than or equal to
(4) grab samples collected at equally spaced two (2) hour intervals and
obtained from an automatic recording device which continually provides
4. "Daily Maximum limitation' means the I' tation for this parameter shall be applied as an instantaneous maximum (or,
for pH or DO, instantaneous minimum) v ue. The instantaneous value is defined as the analytical result of any
individual sample. DMRs shall include t~ maximum (and/or minimum) of all instantaneous values within dte caltndaz
month. Any instantaneous value beyond a noted daily maximum limitation for the indicated parameter shall be
considered a violation of this permit.
5. "Grab" sample, is a single "dip and take" sample so as to be representative of the parameter being monitored.
6. "ln-sim" measurement is defined as a sin le reading, observation or measurement taken in the field at the point of
discharge.
7. "Instantaneous" measurement is a single ading, observation, or measurement performed on site using existing
monitoring facilities.
8. "Quarterly measurement frequency" m samples may be collected at any time during the calendar quatter if a
continual discharge occurs. If the discharge is interminent, then samples shall be collected during the period that
discharge occurs.
9. "Seven (7) day average" means the arith~tetic mean of all samples collected in a seven (7) consecutive day period. Stitch
seven (7) day averages shall be calculat for all calendaz week, which are defined as beginning on Stmday and t:nding
on Samrday. If the calendaz week overlaps two months (i.e. [Ire Sunday is in one month and Ute Samrday in the
following month), the seven (7) day aver ge calculated for that calendar week shall be associated with the month .hat
comains the Saturday. Samples may note used for more than one (1) reporting period.
]0. "Thirty (30) day average" means the ari etic mean of all samples collected during a thirty (30) consecutiveday
period. The pertnittee shall report the ropriate mean of all self-monitoring sample data collated during the calendar
month on the Dischazge Monitoring Rep rts. Samples shall nct be used for more than one (1) reporting period.
l 1. "Total Metals" means the wncenvation f metals determined on an unfiltered sample following vigorous digestion
(Section 4.1.3), or the sum of the conce~ rations of metals in Moth the dissolved and suspended fractions, as described in
Manual of Methods for Chemical Analysts of Water and Wasters, U.S. Environmental Protection Agency, March 1979,
or its equivalent.
I12. "Total Recoverable Metals" means that ~ottion of a water and suspended sediment sample measttred by the total
recoverable analytical procedure, or the concentration of metals in an unfiltered sample following treatment with tot
dilute mineral acid as described in Sectia~n 4.1.4 of Manual of Methods for Chemical Analysis of Water and Wastes,
U.S. Environmental Protection Agency, March 1979, or its equivalent.
13. "Visual" observation is observing the
14, "Water Quality Control Division" or "'.
101 et al.
Additional relevant definitions are found
to check for the presence of a visible sheen or floating oil.
ision" means the state Water Quality Control Division as established in 2~
the Colorado Waterr Qttality Control Act, CRS §§ 25-8-101 et sea.., the
iv , 5 CCR 100:L-2, § 6.1.0 et sett and other applicable regrilations.
INDBP ~l9/93