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PARTI <br />Page No. 10 <br />Permit No.: CO-0000132 <br />instantaneous value beyond the noted daily maximum limitation for the indicated parameter shall be considered a violation of <br />this permit. <br />5. "Dissolved (D) metals fraction" is defined in the Basic Standards and Methodoloeies for Surface Water 1002-3I, 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 tine chemical <br />solution. <br />6. "Grab" sample, is a single "dip and take" sample so as to be representative of the parameter being monitored. <br />7. "In-situ" measurement is defined as a single reading, observation or measurement taken in the field at the point of discharge. <br />8. "Instantaneous" measurement is a single reading; observation, or measurement performed on site using existing monitoring <br />facilities. <br />9. "Potentially dissolved (PD) metals fraction" is defined in the Basic Standazds 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 tat 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 />10. "Quarterly measurement frequency" means sarrrples maybe collected at any time during the calendaz quarter if a continual <br />dischazge occurs. If the discharge is intermittent, then samples shall be collected during the period that dischazge occurs. <br />17. ~ "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 />consecpive day period. Such seven (7) day averages shall be calculated for all calendaz weeks, which.aze defined as <br />beginning on Sunday and ending on Saturday. If the calendaz 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 that calendar 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 />12. "Thirty (30) day average" means, except for fecal coIiform 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 pennittee shall report the appropriate mean of all self-monitoring sample data collected during the <br />calendaz month on the Dischazge Monitoring Reports. Samples shall not be used for more than one (1) reporting period. <br />13. "Total Metals" means the concentration ofinetals determined 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 descnbed in "Manual of <br />Methods for Chemical Analysis ojWater and Wastes," U.S. Environmental Protection Agency, Mazch 1979, or its equivalent. <br />14. "Total Recoverable (TR) Metals" means that portion of a water and suspended sediment sample measured by the total <br />recoverable analytical procedure described in "Methods for Chemical Analysis of Water and Wastes, " U.S. Environmental <br />Protection Agency, Mazch 1979 or its equivalent. <br />15. "Visual" observation is observing the dischazge to check for the presence of a visrble sheen or floating oil. <br />16. "Water Quality Control Division" or "Division" means the state Water Quality Control Division as established in 25-8-101 et <br />al.) <br />Additional relevant definitions aze found in the Colorado Water Quality Control Act, CRS §§ 25-8-101 et seo•, the Colorado <br />Dischazge Permit System Regulations, Regulation 61 (5 CCR 1002-61) and other applicable regulations. <br />D. SPECIAL REQUIREMENTS <br />1. Materials Containment Plan <br />Pursuant to Sections 61.8(3)(g) and (r) of the Colorado Discharge Pemrit System Regulations, the permittee is required to <br />submit a Materials Containment Plan. Such a plan was previously submitted to the Division. An update of the plan shall be <br />Revised 03/22/04 <br />