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PARTI Permit No. CO-0032638 Page No. 13 C. DEFINITIONS OF TERMS 10. "Quarterly measurement frequency" means samples may be collected at any time during the calendar quarter if a continual discharge occurs. If the discharge is intermittent, [hen samples shall be collected during the period that discharge occurs. l 1. "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 the arithmetic mean of all 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 beginning on Sunday and ending on Samrday. if the calendar week overlaps two months (i.e. [he 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 Samrday. Samples may no[ be used for more than one (1) reporting period. 13. "Thirty (30) day average" means the arithmetic mean of all samples collected during a thirty (30) consecutive-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 (I) 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 concenva[ions of metals in both the dissolved and suspended fractions, as described in "Manual ojMethods for Chemical Analysis of Water and Wastes," U.S. Environmental Protection Agency, March 1979, or its equivalent. 15. "Total Recoverable Metals" means [hat portion of a water and suspended sediment sample measured by the total recoverable analytical procedure described in "Methods jor Chemical Analysis of Water and Wastes, " U.S. Environmental Protection Agency, March 1979 or its equivalent. 16. "Visual" observation is observing the discharge to check for the presence of a visible sheen or floating oil. 17. "Water Quality Control Division" or "Division" means the state Water Quality Convol Division as established in 25-8-101 et al.) Additional relevant definitions are found in [he Colorado Water Quality Control Act, CRS §§ 25-8-101 et sec .., [he Colorado Discharge Permit System Regulations, Regulation 61 (5 CCR 1002-61) and other applicable regulations. D. SPECIAL REQUIREMENTS 1. Materials Containment Plan Pursuant to Sections 61.8(3)(g) and (r) of the Colorado Discharge Permit System Regulations, [he permittee is required to submit a Materials Containment Plan. Such a plan was previously submitted to [he Division. An update of the plan shall be submitted to the Division within ninety days after the effective date of this permit and must be implemented. The update of the plan shall include changes in the 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 !~?'. The updated plan shall include, but not necessarily be limited [o: a. An updated history of the spills which have occurred in the three years preceding the effective date of this permit. The history shall include a discussion on the cause of the spills and a the preventative measures designed to eliminate them from reoccurring;