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PART 1 <br />Pagz xvi <br />Permit No. CO-0043648 <br />5. "Daily Maximum limitation' means the limitation for this parameter shall be applied as an instantaneous maximum <br />(or, for pH or DO, instantaneous minimum) value. The instantaneous value is defined as the analytical result of any <br />individual sample. DMRs shall include the maximum (and/or minimum) of all instantaneous values within the <br />calendar month. Any instantaneous value beyond [he noted daily maximum limitation for the indicated parameter <br />shall be considered a violation of this permit. <br />6. 'Grab" sample, is a single "dip and take" sample so as to be representative of the parameter being monitored. <br />7. "iu-situ' measurement is defimed as a single reading, observation or measurement taken in the field at the point of <br />discharge. <br />8. 'Lastantaneous" measurement is a single reading, observation, or measurement performed on site using existing <br />monitoring facilities. <br />9. 'Potentially dissolved (PD) metal fraction "is defined in the Basic Standards and Methodoloeies for Surface Water <br />3.1.0, as that portion of a constituent measured from the filtrate of a water and suspended sediment sample that was <br />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 0.4 <br />or 0.45-UM membrane filter. Note the "potentially dissolved" method cannot be used where nitric acid will interfere <br />with the analytical procedure used for [he cons[imen[ measured. <br />I0. "Piocess Waters" are those discharges which originate from an area of disturbance which includes areas where ore is <br />handled, stockpiled, or processed; waste rock is stockpiled or disposed; topsoil is stockpiled; adits; tailings ponds; <br />tailing piles; mills and mine pits; and stockpiled spent ores. While waters on [he surface running off such areas/piles <br />during a unique storm event may be considered as stormwaler, waters which percolate through a pile and discharges <br />at the toe over an extended period of time, or water which flows below [he ground surface and later resurfaces, are <br />process water.. <br />11. 't?ttarterly 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 />I2. "Recorder' requires the continuous operation of a chart and/or totalizer (or drinking water rotor meters or pump hour <br />meters where previously approved.) <br />13. "Seven (7) day average" means, with the exception of fecal coliform bacteria, the arithmetic mean of all samples <br />collected in a seven (7) consecutive day period. For fecal coliform bacteria, it is the geometric mean of all samples <br />taken in a seven (7) consecutive day period. Such seven (7) day averages shall bz calculated for all calendar weeks, <br />which are defined as beginning on Sunday and ending on Saturday. If the calendar week overlaps two months (i.e. <br />the Sunday is in one month and the Samrday in the following month), the seven (7) day average calculated for that <br />calendar week shall be associated with the month that contains the Saturday. Samples may not be used for more than <br />one (1) reporting period. <br />14. 'Stormwater", is a discharge of precipitation induced runoff which results from a unique storm event. A stormwater <br />discharge commences soon after the beginning of an event and ceases at the end of the event or soon thereafter, <br />allowing for interfiow and discharge. The exception to this is detention ponds designed for [he sole purpose of <br />collection and/or treatment of stormwater. Such ponds may discharge for a short time, such as 36 or 48 hours after <br />the event ceases. <br />IN D9P Ci4N1 <br />