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PARTI <br />Page No. 6 <br />PemutNo.: CO-0036251 <br />'. DEFINITIONS OF TERMS (CONTINUED) <br />12. "Seven (7) day average" means, with the exception of fecal coliform bacteria, the arithmetic mean of all samples collected in <br />a seven (7) consecutive day period. For fecal coliform bacteria, it is the geometric mean of all samples taken in a seven (7) <br />consecutive day period. Such seven (7) day averages shall be calculated for all calendar weeks, which aze defined as <br />beginning on Sunday and ending on Saturday. If the calendar week overlaps two months (i.e. the Sunday is in one month and <br />the Saturday in the following month), the seven (7) day average calculated for [hat calendaz week shall be associated with the <br />month that contains the Saturday. Samples may not be used for more than one (1) reporting period. (Not applicable to fecal <br />coliform determinations.) <br />13. "Thirty (30) day average" means, except for fecal coliform bacteria, the arithmetic mean of all samples collected during a <br />thirty (30) consecutive-day period. For fecal coliform bacteria, it is the geometric mean of all samples collected in a thirty <br />(30) day period. The permittee shall report the appropriate mean of all self-monitoring sample data collected during the <br />calendar month on the Discharge Monitoring Reports. Samples shall not be used for more than one (1) reporting period. <br />14. "Total Metals" means the concentration of metals detemrined on an unfiltered sample following vigorous digestion (Section <br />4.1.3), or the sum of the concentrations of metals in both the dissolved and suspended fractions, as described in "Manual of <br />Methods for Chemical Analysis of Water and Wastes," U.S. Environmental Protection Agency, March 1979, or its equivalent. <br />15. "Total Recoverable Metals" means that portion of a water and suspended sediment sample measured by the total recoverable <br />analytical procedure described in "Methods for Chemical Analysis of Water and Wastes, " U.S. Environmental Protection <br />Agency, March 1979 or its equivalent. <br />16. "Twenty four (24) hour composite" sample is a combination of at least eight (8) sample aliquots of at least 100 milliliters, <br />collected at equally spaced intervals during the operating hours of a facility over atwenty-four (24) hour period. For volatile <br />pollutants, aliquots must be combined in the laboratory immediately before analysis. The composite must be flow <br />proportional; either the time interval between each aliquot or the volume of each aliquot must be proportional to either the <br />wastewater or effluent flow at the time of sampling or the total wastewater or effluent flow since the collection of [he previous <br />aliquot. Aliquots maybe collected manually or automatically. <br />17. "Twice Monthly" monitoring frequency means that two samples shall be collected each calendar month on separate weeks <br />with at least one full week between the two sample dates. Also, there shall be at least one full week between the second <br />sample of a month and the first sample of the following month. <br />18. "Visual" observation is observing the discharge to check for the presence of a visible sheen or floating oil. <br />19. "Water Quality Control Division" or "Division" means the state Water Quality Control Division (as established in CRS §§ 25- <br />8-101 et al.). <br />Additional relevant defmitions are found in the Colorado Water Quality Control Act, CRS §§ 2d-8-101 et sec ,the Colorado <br />Discharge Permit System Regulations, Regulation 61 (5 CCR 1002-61) and other applicable regulations. <br />