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PARTI Page No. 9 PemritNo.: CO-0047562 8. "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. 9. "Quarterly measurement frequency" means samples maybe collected at any time during the calendar quarter if a contimtal discharge occurs. Tf the discharge is intermittent, then samples shall be caller#ed during the period that discharge occurs. 10. "Recorder" requires the continuous operation of a chart and/or totalizer (or drinking water rotor meters or pump hour meters where previously approved.) 11. "Seven (7) day average" means, the arithmetic mean of alI samples collected in a seven {7) consecutive day period. Such seven (7) day averages shall be calculated for all calendar weeks, which are defined as begitrning on Sunday and ending on Saturday. If the calendar week overlaps riwo months (i.e. the Sunday is in one month and the Saturday in the following month), the seven (7) day average 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 or E, colr determinations.) 12. "Thirty (30) day average" means, except for fecal coliform or E. roll bacteria, the arithmetic mean of all samples collected during a thirty {30) consecutive-day period. For fecal coliform or E. roll 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 duriug the calendar month an the Discharge Monitoring Reports. Samples shall not be used for more than one (1) reporting period. 13. "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 bout 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. 14. "Total Recoverable Metals" means that portion of a water and suspended sediment sample measured by the total recoverable analytical proceduue described in Methods for Chemical Analysis of Water and Wastes, U.S. Environmental Protection Agency, March 1979 or its equivalent. 15. "Visual" observation is observing the discharge to check for tite presence of a visible sheen or floating oil. lb. "Water Quality Control Division" or "Division" means the state Water Quality Control Division as established in 25-8-101 et ai.) Additional relevant definitions are found in the Colorado Water Quality Control Act, CRS §§ 25-8-]Ol et se ,the Colorado Discharge Permit System Regulations, Regulation 61 (5 CCR 1002-61) and other applicable regulations. D. SPECIAL }ZEQiTIREl\•lENTS 1. Materials Containment Plan Pursuant to Sections 61.8(3)(g) and (r) of the Colorado Discharge Pemrit System Regulations, the petmittee is required to submit a Materials Containment Plan. Such a pion shall be submitted to the Division within ninety {90) days after the effective date of this permit and must be implemented, The plan shall include information and procedures for the prevention and containment of spills of materials used, processed or stored at the facility which if spilled would have a reasonable probability of having a visible or otherwise detrimental impact on waters of the State 1/ 2/. The plan shall include, but not necessarily be limited to: a. An updated history of the spills which have occurred in the three (3) years preceding the effective date of this pemut. The history shall include a discussion on the cause of the spills and a the preventative measures designed to eliminate them from reoccurring;