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PARTI Permit No. CO-0029599 Pagc No. 9 • C. DEFINITIONS OF TERMS 9. "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, then samples shall be collected during the period that discharge occurs. 10. "Recorder" requires the continuous operation of a chart andlor totalizer (or drinking water rotor meters or pump hour meters where previously approved,) 11. "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 aze defined as beginning on Sunday and ending on Saturday. If the calendar week overlaps two 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 [Iran one (1) reporting period. 12. "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 mondr on the Discharge Monitoring Reports. Samples shall not be used for more than one (1) reporting period, 13. "Total Recoverable Metals" means that portion of a water and suspended sediment sample measured by the total recoverable analytical procedure described in "Methods for Chemical Analysis of Water and Wastes, " U.S. Environmental Protection Agency, March 1979 or iu equivalent. 14. "Visual" observation is observing the discharge to check for the presence of a visible sheen or floating oil. 15. "Water Quality Control Division" or "Division" means the state Water Quality Control Division as established in 25- 8-101 et al.) Additional relevant definitions are found in the Colorado Water Quality Control Act, CRS §g 25-8-101 et sec., the 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)(8) and (r) of the Colorado Discharge Permit System Regulations, the permittee is required to submit a Materials Containment Plan. Such a plan was previously submitted to the 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 dte plan shall include changes in the information and procedures for the prevention and conrainnrent 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''-'v. The updated plan shall include, but not necessarily be limited to: 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; b. An update of the reporting system which will be used to notify, at a minimum, responsible facility management, the Division, the Environmental Protection Agency, downstream water users within 5 miles downstream of the facility, and local health officials; • c. A description of any changes in the preventative facilities (including overall facility plot) which prevent, contain, or treat spills and unplanned discharges; d. A current list which includes the volumes or quan[ities of all materials used, processed, or stored at the facility which represent a potential spill threat to surface waters. The location of stored material shall be indicated on the facility plot submitted for item c;