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Appendix 4.7-8
<br />PART 111
<br />Page 29 of 31
<br />Permit No.: CO0048972
<br />16. "In-situ" measurement is defined as a single reading, observation or measurement taken in the field at the point of
<br />discharge.
<br />17. "Instantaneous" measurement is a single reading, observation, or measurement performed on site using existing
<br />monitoring facilities.
<br />18. "LC50" or "Lethal Concentration" is the toxic or effluent concentration that would cause death in 50 percent of the
<br />test 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
<br />practices) that are technologically available and economically practicable and achievable in light of best industry
<br />practice.
<br />21. "New Discharger' - means any building, structure, facility, or installation from which there is or may be a discharge
<br />of pollutants that did not commence at the particular site before August 13, 1979, that is not a new source, and
<br />that has never received a 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
<br />exposed in a full life cycle or partial life cycle (short term) test, that causes no observable adverse effects on the
<br />test organisms (i.e. the highest concentration of toxicant in which the values for the observed responses are not
<br />statistically different from the controls). This value is used, along with other factors, to determine toxicity limits
<br />in permits.
<br />23. "Person" - an individual, corporation, partnership, association, state or political subdivision thereof, federal
<br />agency, state 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,
<br />channel, tunnel, conduit, well, discrete fissure, container, rolling stock, concentrated animal feeding operation, or
<br />vessel or other floating craft, from which pollutants are or may be discharged. "Point Source" does not include
<br />irrigation return flow. See 5 CCR 1002-61.2(75).
<br />25. "Pollutant" - dredged spoil, dirt, slurry, solid waste, incinerator residue, sewage, sewage sludge, garbage, trash,
<br />chemical waste, biological nutrient, biological material, radioactive material, heat, wrecked or discarded
<br />equipment, rock, sand, or any industrial, 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
<br />1002-31, as that portion of a constituent measured from the filtrate of a water and suspended sediment sample
<br />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
<br />using a 0.40 or 0.45 -UM (micron) membrane filter. Note the "potentially dissolved" method cannot be used where
<br />nitric acid will interfere with the analytical procedure used for the constituent measured.
<br />27. "Practical Quantitation Limit (PQL)" means the minimum concentration of an analyte (substance) that can be
<br />measured with a high degree of confidence that the analyte is present at or above that concentration. The use of
<br />PQL in this document may refer to those PQLs shown in Part I.D of this permit or the PQLs of an individual
<br />Laboratory.
<br />28. "Qualified Personnel" - those who possess the knowledge and skills to assess conditions and activities that could
<br />impact 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
<br />continual discharge occurs. If the discharge is intermittent, then samples shall be collected during the period that
<br />discharge occurs.
<br />30. "Recorder' requires the continuous operation of a chart and/or totalizer (or drinking water rotor meters or pump
<br />hour meters where previously approved.)
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