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Pemtit No. CO-0032638 Page 9 Outfall Freauency Sample Tvpe 004A and 007A Quarterly Grab Self-monitoring samples taken in compliance with the monitoring requirements speci5ed above shall be taken at those locations listed in Part I.B.1. Where, based on a minimum of 5 samples, the permittee demonstrates to the satisfaction of the Division that the level of total dissolved solids (TDS) in the effluent can be calculated based upon the level of electrical conductivity, the pemrittee may measure and report TDS in terms of electrical conductivity. C. DEFINITIONS OF TERMS 1. "Chronic lethality" occurs when a statistically significant difference, at the 95% confidence level, occurs in the chronic test between the mortality of the test species in 100% effluent at Outfa11004A and 94% effluent at Outfa11007A (the chronic IWC equals 100% at Outfall 004A and 94% at Outfa11007A) and the control. 2 "Continuous" measurement is a measurement obtained from an automatic recording device which continually measures provides measurements. 3. "Daily Maximum limitation" means the limitation for this parameter shall be applied as an instantaneous maximum (or, for pH or DO, instantaneous minimum) value. The instantaneous value is defined as the analytical result of any individual sample. DMRs shall include the maximum (and/or minimum) of all instantaneous values within the calendar month. Any instantaneous value beyond the noted daily maximum limitation for the indicated parameter shall be considered a violation of this permit. 4. "Dissolved (D) metals fraction" is defined in the Basic Standazds and Methodologies for Surface Water 1002-31, as that portion of a water and suspended sediment sample which passed through a 0.40 or 0.45 UM (micron) membrane filter. Determinations of "dissolved" constituents are made using the filtrate. This may include some very small (colloidal) suspended particles which passed through the membrane filter as well as the amount of substance present in true chemical solution. 5. "Grab" sample, is a single "dip and take" sample so as to be representative of the parameter being monitored. 6. "In-situ" measurement is defined as a single reading, observation or measurement taken in the field a[ [he point of discharge. 7. "Instantaneous" measurement is a single reading, observation, or measurement performed on site using existing monitoring facilities. 8. "Potentially dissolved (PD) metals fraction" is defined in the Basic Standards and Methodologies for Surface Water 1002-31, as that portion of a constituent measured from the filtrate of a water and suspended sediment sample that was first 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 (micron) membrane filter. Note the "potentially dissolved" method cannot be used where nitric acid will interfere with the analytical procedure used for the constituent measured. 9. "Semi-Annual measurement frequency" means samples maybe collected at any time during the calendar half-yeaz (6 months) if a continual discharge occurs. If the dischazge is intemtittent, then samples shall be collected during the period that discharge occurs. 10. "Quarterly measurement frequency" means samples maybe collected at any time during the calendar quarter if a continual discharge occurs. If the discharge is intermittent, then samples shall be collected during the period that discharge occurs. 11. "Recorder requires the continuous operation of a chart and/or totalizer (or drinking water rotor meters or pump hour meters where previously approved.) 12. "Thirty (30) day average" means, except for fecal coliform bacteria, the arithmetic mean of all samples collected during a thirty (30) consecutive-day period. For fecal coliform bacteria, it is the geometric mean of all samples collected in a thirty (30) day period. The petmittee shall report the appropriate mean of all self-monitoring sample data collected during the calendar month on the Discharge Monitoring Reports. Samples shall not be used for more than one (1) reporting period.