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~~ Part 1 Page No. I S Petmit No.: CO-0043648 8. "Potentially dissolved (PD) metal fraction "is defined in the Basic Standards and Methodoloeies for Surface Water 3. I.O, as that portion of a constituent meastued from the filtrate of a water and suspended sediment sample that was first Vested 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 or 0.45-1IIv1 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. "Process Waters" are those discharges which originate from an area of disturbance which includes areas where ore is handled, stockpiled, or processed; waste rock is stockpiled or disposed; topsoil is stockpiled; adits; tailings ponds{ [ailing piles, mitts and mini pits, and stockpiled spent ores. While waters on [he surface running off such azeasfpdes during a unique storm event may be considered as stormwater, waters which percolate through a pile and discharges at the tce over an extended period of time, or water which flows below the ground surface and later resurfaces, are process water.. 10. "Quarterly measurement frequency" means samples may be collected at any time during the calendar quarter ff a continual discharge occurs. If the discharge is intermittent, then samples shall be collected during the period that discharge occurs. I I . "Recorder" requires the continuous operation of a chart and/or totalizer (or drinking water rotor meters or pump hour meters where previously approved.) 12. "S[ormwater", is a discharge of precipitation induced runoff which results from a unique storm even[. A stotmwater discharge commences soon after the beginning of an event and ceases at the end of the event or soon thereafter, allowing for interflow and discharge. The exception to this is detention ponds designed for [he sole purpose of collection and/or treatment of stormwa[er. Such ponds may discharge for a short time, such as 36 or 48 hours after the event ceases l3. "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, i[ is the geometric mean of all samples collected in a thirty (30) day period. The pennittee 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. 14. "Twenty four (24) hour composite" sample is a combmation of at least eight (8) sample aliquots of at least 100 milliliters, collected a[ equally spaced intervals during the operating hours of a facility over atwenty-four (24) how period For volatile pollutants, aliquots must be combined in the laboratory immediately before analysis. The composite must be flow proportional; either the time interval between each aliquot or the volume of each aliquot must be proportional to either the wastewater or effluent flow at the time of sampling or the total wastewater or effluent flow since the collection of the previous aliquot. Aliquots may be collected manuall}' or automatically. 15. "Twice/Month" monitoring frequency means that two samples shall be collected each calendar month on separate weeks with at least one full week between the two sample dates. Also, (here shall be at least one full week between the second sample of a month and the first sample of the following month. 16. "Visual" observation is observing the discharge to check for the presence of a visible sheen or floating oil. 17. "Water Quality Control Division" or "Division" means the state Water Quality Control Division as established in 25-8-101 et al. D. REPORTING Sipnatorv and Certification Requirements All reports and other information required by the Division, shall be signed and certified for accuracy by the permittee in accord with the following criteria: (I) In the case of corporations, by a principal executive officer of at least the level ofvice-president or his or her duly authorized representative, if such representative is responsible for the overall operation of the facility from which the discharge described in the form originates;