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PART I <br />Page No. 8 <br />Permit No. CO-0045080 <br />• C. DEFIMTIONS OF TERMS <br />4. "Daily Maximum limitation' meatus 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 <br />of this permit. <br />5. "Grab" sample, is a single "dip and take" sample so as to be representative of the parameter being monitored. <br />6. "In-situ" measurement is defined as a single reading, observation or measurement taken in the field at the point of <br />discharge. <br />7. "Instantaneous" measurement is a single reading, observation, or measurement performed on site ruing existing monitoring <br />facilities. <br />8. "Quarterly measurement frequency" means samples may be collected at any time during the calendar quarter if a continual <br />discharge occurs. If the dischazge is intermittent, then samples shall be collected during the period that discharge occurs. <br />9. "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 />l0. "Seven (7) day average" means the arithmetic mean of all samples collected in a seven (7) consecutive day period. Such <br />seven (7) day averages shall be calculated for all calendar weeks, which aze defined as beginning on Sunday and ending on <br />Saturday. If the calendar week overlaps two months (i.e. the Sunday is in one month and the Saturday in the following <br />• month), the seven (7) day average calculated for that calendaz week shall be associated with the month that contains the <br />Saturday. Samples may not be toed for more than one (1) reporting period. <br />13. 'Thirty (30) day average" means the arithmetic mean of all samples collected during a thirty (30) consecutive-day period. <br />The perntittee shall repott the appropriate mean of all self-monitoring sample data collected during the calendaz month on <br />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 determined on an unfdtered 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 Wa_ctes, U.S. Environmental Protection Agency, March 1979, or its <br />equivalent. <br />15. 'Visual" observation is observing the dischazge to check for the presence of a visible sheen or floating oil. <br />16. "Water Quality Control Division" or "Division" means the state Water Quality Control Division as established in <br />25-8-101 et al. <br />Additional relevant definitions are found in the Colorado Water Quality Control Act, CRS §§ 25-8-101 g1 ~eq„ the <br />Colorado DischarEe Permit System Regulations, 5 CCR 1002-2, § 6.1.0 SI SS9. and other applicable regulations. <br />D. SPECIAL REQUIREMENTS <br />I. haterials Containment Plan <br />• Pursuant to Sections 6.9.3 (6) and (18) of the Colorado Discharge Permit System Regulations, the permittee is required to <br />submit a Materials Contairunent Plan. Such a plan shall be submitted to the Division within ninety (90) days after the <br />effective date of this permit and must be implemented. The plan shall include information and procedures for the <br />prevention and containment of spills of materials used, processed or stored at the facility which if spilled would have a <br />reasonable probability of having a visible or otherwise detrimental impact on waters of the State r'j`. The plan shall <br />include, but na[ necessazily be limited [o: <br />