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PARTI <br />Page No. 21 <br />Permit No.: CO-0000906 <br />LJ <br />• <br />i. "Daily Maximum limitation" means the limitation for this parameter shall be applied as an instantaneous maximum (or, for <br />pH or DO, instantaneous minimum) value. The instantaneous value is defined as the analytical result of any individual <br />sample. DMRs shall include the maximum (and/or minimum) of all instantaneous values within the calendar month. Any <br />instantaneous value beyond the noted daily maximum limitation for the indicated parameter shall be considered a violation of <br />this permit. <br />6. "Dissolved (D) metals fraction" is defined in the Basic Standards and Methodologies for Surface Water 1002-31, as that <br />portion of a water and suspended sediment sample which passed through a 0.40 or 0.45 UM (micron) membrane filter. <br />Determinations of "dissolved" constituents are made using the filtrate. This may include some very small (colloidal) <br />suspended particles which passed through the membrane filter as well as the amount of substance present in true chemical <br />solution. <br />7. "Grab" sample, is a single "dip and take" sample so as to be representative of the parameter being monitored. <br />8. "In-situ" measurement is defined as a single reading, observation or measurement taken in the field at the point of discharge. <br />9. "Instantaneous" measurement is a single reading, observation, or measurement performed on site using existing monitoring <br />facilities. <br />10. "Potentially dissolved (PD) metals fraction" is defined in the Basic Standards and Methodologies for Surface Water 1002-31, <br />as 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 />11. "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 />12. "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 />13. "Seven (7) day average" means, with the exception of fecal coliform or E. soli bacteria, the arithmetic mean of all samples <br />collected in a seven (7) consecutive day period. For fecal coliform or E. soli bacteria, it is the geometric mean of all samples <br />taken in a seven (7) consecutive day period. Such seven (7) day averages shall be calculated for all calendar weeks, which are <br />defined as beginning on Sunday and ending on Saturday. If the calendar week overlaps two months (i.e. the Sunday is in one <br />month and the Saturday in the following month), the seven (7) day average calculated for that calendar week shall be <br />associated with the month that contains the Saturday. Samples may not be used for more than one (1) reporting period. (Not <br />applicable to fecal coliform or E. coli determinations.) <br />14. The "Sodium Adsorption Ratio" or SAR means the calculated ratio based on the following formula: <br />Na+ <br />SAR = <br />Ca++ + Mg++ <br />The values for sodium (Na'), calcium (Ca"), and magnesium (Mg'+) in this equation are expressed in units of milli- <br />equivalents per liter (meq/1). The meq/1 must be calculated using analytical results, reported in terms of mg/1, using the <br />following conversion: <br />• <br />meq/1 = <br />Concentration in mg / 1 <br />Equivalent weight in mg l meq <br />Where the equivalent weights are determined based on the atomic weight of the element divided by the ion's charge: <br />Na' = 23.0 mg/meq (atomic weight of 23, charge of 1)