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PART III
<br />Page 45 of 47
<br />Permit No.:0O0000213
<br />17. "Instantaneous" measurement is a single reading, observation, or measurement performed on site using existing monitoring
<br />facilities.
<br />18. %C50" or "Lethal Concentration" is the toxic or effluent concentration that would cause death in 50 percent of the test
<br />organisms over a specified period of time.
<br />19. "Measurable storm event" - a storm event that results in an actual discharge from the facility.
<br />20. "Minimize" - reduce and/or eliminate to the extent achievable using control measures (including best management practices)
<br />that are technologically available and economically practicable and achievable in light of best industry practice.
<br />21. "New Discharger" - means any building, structure, facility, or installation from which there is or may be a discharge of pollutants
<br />that did not commence at the particular site before August 13, 1979, that is not a new source, and that has never received a
<br />final effective permit for discharges at the site. See 5 CCR 1002-61.2(65).
<br />22. "NOEC" or "No -Observed -Effect -Concentration" is the highest concentration of toxicant to which organisms are exposed in a full
<br />life cycle or partial life cycle (short term) test, that causes no observable adverse effects on the test organisms (i.e. the highest
<br />concentration of toxicant in which the values for the observed responses are not statistically different from the controls). This
<br />value is used, along with other factors, to determine toxicity limits in permits.
<br />23. "Person" - an individual, corporation, partnership, association, state or political subdivision thereof, federal agency, state
<br />agency, municipality, Commission, or interstate body. See 5 CCR 1002-61.2(73).
<br />24. "Point source" - any discernible, confined, and discrete conveyance, including, but not limited to, any pipe, ditch, channel,
<br />tunnel, conduit, well, discrete fissure, container, rolling stock, concentrated animal feeding operation, or vessel or other floating
<br />craft, from which pollutants are or may be discharged. "Point Source" does not include irrigation return flow. See 5 CCR 1002-
<br />61.2(75).
<br />25. "Pollutant" - dredged spoil, dirt, slurry, solid waste, incinerator residue, sewage, sewage sludge, garbage, trash, chemical waste,
<br />biological nutrient, biological material, radioactive material, heat, wrecked or discarded equipment, rock, sand, or any industrial,
<br />municipal or agricultural waste. See 5 CCR 1002-61.2(76).
<br />26. "Potentially dissolved (PD) metals fraction" is defined in the Basic Standards and Methodologies for Surface Water 1002-31, as
<br />that portion of a constituent measured from the filtrate of a water and suspended sediment sample that was first treated with
<br />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)
<br />membrane filter. Note the "potentially dissolved" method cannot be used where nitric acid will interfere with the analytical
<br />procedure used for the constituent measured.
<br />27. "Practical Quantitation Limit (PQL)" means the minimum concentration of an analyte (substance) that can be measured with a
<br />high degree of confidence that the analyte is present at or above that concentration. The use of PQL in this document may refer
<br />to those PQLs shown in Part I.D of this permit or the PQLs of an individual laboratory.
<br />28. "Qualified Personnel" - those who possess the knowledge and skills to assess conditions and activities that could impact
<br />stormwater quality at a facility, and who can also evaluate the effectiveness of control measures.
<br />29. "Quarterly measurement frequency" means samples may be collected at any time during the calendar quarter if a continual
<br />discharge occurs. If the discharge is intermittent, then samples shall be collected during the period that discharge occurs.
<br />30. "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 />31. "Seven (7) day average" means, with the exception of fecal coliform or E. coli bacteria (see geometric mean), the arithmetic
<br />mean of all samples collected in a seven (7) consecutive day period. Such seven (7) day averages shall be calculated for all
<br />calendar weeks, which are defined as beginning on Sunday and ending on Saturday. If the calendar week overlaps two months
<br />(i.e. the Sunday is in one month and the Saturday in the following month), the seven (7) day average calculated for that calendar
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