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Part I <br />Page No. 7 <br />Permit No.: CO-0046348 <br />DEFINITIONS OF TERMS <br />]. "Composite" sample is a minimum of four (4) grab samples collected at equally spaced two (2) hour intervals and proportioned <br />according to flow. <br />2. "Continuous" measurement, is a measurement obtained from an automatic recording device which continually provides <br />measurements. <br />3. "Daily Maximum limitation" means the limitation for this parameter shall be applied as an instantaneous maximum (or, for pH <br />or DO, instantaneous minimum) value. The instantaneous value is defined as the analytical result of any individual sample. <br />DMRs shall include the maximum (and/or minimum) of all instantaneous values within the calendaz month. Any instantaneous <br />value beyond the noted daily maximum limitation for the indicated parameter shall be considered a violation of this permit. <br />4. "Dissolved (D) metals fraction" is defined in the Rasic Srandardc and Methndningies for 4nrface Water 1002-31, as that portion <br />of a water and suspended sediment sample which passed through a 0.40 or 0.45 um (micron) membrane filter. Determinations <br />of "dissolved" constituents aze made using the filtrate. This may include some very small (colloidal) suspended particles, which <br />passed through the membrane filter as well as the amount of substance present in tme chemical solution. <br />5. "Grab" sample, is a single "dip and take" sample to be representative of the parameter being monitored. <br />6. "In-situ" measurement is defined as a single reading, observation or measurement taken in the field at the point of dischazge. <br />7. "Instantaneous" measurement is a single reading, observation, or measurement performed on site using existing monitoring <br />facilities. <br />8. "Potentially dissolved (PD) metals fraction" is defined in the Rac;c Standards and Merhndologitac fnr C„rfaee Water at 5 CCR <br />1002-31, as that portion of a constituent measured from the filtrate of a water and suspended sediment sample that was first <br />treated with nitric acid to a pH of 2 or less and let stand for 8 to 96 hours prior to sample filtration using a 0.40 or 0.45-UM <br />(micron) membrane filter. Note the "potentially dissolved" method cannot be used where nitric acid will interfere with the <br />analytical procedure used for the constituent measured. <br />9. "Quarterly measurement frequency" means samples may be collected at any time during the calendaz quarter if a continual <br />dischazge occurs. If the discharge is intermittent, then samples shall be collected during the period that discharge occurs. <br />10. "Recorder" requires the continuous operation of a chart and/or totalizer (or drinking water rotor meters or pump hour meters <br />where previously approved.) <br />11 "Seven (7) day average" means, with the exception of fecal coliform bacteria, the arithmetic mean of all samples collected in a <br />seven (7) consecutive day period. For fecal coliform bacteria, it is the geometric mean of all samples taken in a seven (7) <br />consecutive day period. Such seven (7) day averages shall be calculated for all calendar weeks, which are defuted as beginning <br />on Sunday and ending on Saturday. If the calendar week overlaps two months (i.e. the Sunday is in one month and the Saturday <br />in the following month), the seven (7) day average calculated for that calendaz week shall be associated with the month that <br />contains the Saturday. Samples may not be used for more than one (1) reporting period. (Not applicable to fecal coliform <br />determinations.) <br />12. "Thirty (30) day average" means, except for fecal coliform bacteria, the arithmetic mean of all samples collected during a thirty <br />(30)-consecutive-day period. For fecal coliform bacteria, it is the geometric mean of all samples collected in a thirty (30) day <br />period. The permittee shall report the appropriate mean of all self-monitoring sample data collected during the calendaz month <br />on the Dischazge Monitoring Reports. Samples shall not be used for more than one (1) reporting period. <br />13. "Total Metals" means fhe concentration of metals determined on an unfiltered sample following vigorous digestion (Section <br />4.1.3), or the sum of the concentrations of metals in both the dissolved and suspended fractions, as described in "Manual of <br />Methods for Chemical Analysis of Water and Wastes," U.S. Envvonmental Protection Agency, Mazch 1979, or its equivalent. <br />14. "Total Recoverable Metals" means that portion of a water and suspended sediment sample measured by the total recoverable <br />analytical procedure described in "Methods for Chemical Analysis of Water and Wastes, " U.S. Environmental Protection <br />Agency, March 1979 or its equivalent. <br />