2012-06-08_PERMIT FILE - C2009087A (2)

Home Browse Search

PART Page No. 10 Permit No.: CO0048275 8. "Instantaneous" measurement is a single reading, observation, or measurement performed on site using existing monitoring facilities. 9. "Potentially dissolved (PD) metals fraction" is defined in the Basic Standards and Methodologies for Surface Water 1002 -31, as that portion of a constituent measured from the filtrate of a water and suspended sediment sample 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 using a 0.40 or 0.45-UM (micron) membrane filter. Note the "potentially dissolved" method cannot be used where nitric acid will interfere with the analytical procedure used for the constituent measured. 10. "Quarterly measurement frequency" means samples may be collected at any time during the calendr quarter if a continual discharge occurs. If the discharge is intermittent, then samples shall be collected during the period that discharge occurs. For all parameters with quarterly monitoring requirements, sample collection will begin the first fullcalendar quarter after the effective date of the permit. 11. "Recorder" requires the continuous operation of a chart and/or totalizer (or drinking water rotor meters or pump hour meters where previously approved.) 12. "Seven (7) day average" means, with the exception of fecal coliform bacteria, the arithmetic mean of all samples collected in a seven (7) consecutive day period. For fecal coliform bacteria, it is the geometric mean of all samples taken in a seven consecutive day period. Such seven (7) day averages shall be calculated for all calendar weeks, which are defined as beginning on Sunday and ending on Saturday. If the calendar week overlaps two months (i.e. the Sunday is in one month and the Saturday in the following month), the seven (7) day averige calculated for that calendar week shall be associated with the month that contains the Saturday. Samples may not be used for more than one (1) reporting period. (Not applicable to fecal coliform determinations.) 13. "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, it is the geometric mean of all samples collected in a thirty (30) day period. The permittee 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. "Total Metals" means the concentration of metals determined on an unfiltered sample following vigorous digestion (Section 4.1.3), or the sum of the concentrations of metals in both the dissolved and suspended fractions, as described in Manual of Methods for Chemical Analysis of Water and Wastes," U.S. Environmental Protection Agency, March 1979, or its equivalent. 15. "Total Recoverable Metals" means that portion of a water and suspended sediment sample measured by the total recoverable analytical procedure described in "Methods for Chemical Analysis of Water and Wastes, " U.S. Environmental Protection Agency, March 1979 or its equivalent. 16. "Twenty four (24) hour composite" sample is a combination of at least eight (8) sample aliquots of at least 100 milliliters, collected at equally spaced intervals during the operating hours of a facility over a twenty -four (24) hour 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 orthe 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 preious aliquot. Aliquots may be collected manually or automatically. 17. "Twice Monthly" 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, there shall be at least one full week between the second sample of a month and the first sample of the following month. 18. "Visual" observation is observing the discharge to check for the presence of a visible sheen or floating oil. 19. "Water Quality Control Division" or "Division" means the state Water Quality Control Division as established in 25 -8 -101 et al.) Additional relevant definitions are found in the Colorado Water Quality Control Act, CRS §§ 25.8 -101 et sec.., the Colorado Discharge Permit System Regulations, Regulation 61 (5 CCR 1002-6 1) and other applicable regulations.