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12. "Seven (7) day average" means, with the exception of fecal coliform bacteria, the arithmetic mean of ail samples collectet seven consecutive day period For fecal coliform bacteria, it is the geometric mean of all satrtples taken in a seven copse period. Such seven day averages shall be calculated for all calendar weeks, wizich azc defined as beginning on Sunday a,... e on Saturday. If the calendar week overlaps two months (i.e. the Sunday is in one month and the Saturday in the fotlovvin_e m~ the seven day average calculated for that calendar week shalt be associated with the month that contains the Saturday. Sa • may not be used For more than one reporting period. (Not applicable to fecal coliform determinations.) I3. "Thirty (30) day average' means, except for fecal coliform bacteria, the arithmetic mean of all samples collected durine a i consecutive-day period. For fecal coliform bacteria, it is the geometric mean of all samples collected in a thirty-day period pennittee shall report the appropriate mean of alt self-monitoring sample data collected during the calendar month on the Disc Monitoring Reports. Samples shall not be used For more than one reporting period. 14. "Total Metals" means the concentration of metals determined on an u~ltered sarrrple following vigorous digestion (Section or the sum of the concentrations of metals in both the dissolved and suspended fractions, as described in "bfanua( oJMe:ho Cbemicn! Analysis ojWater and Wastes," U.S. Environmental Protection Agcncy, March 1979, or its equivalent. 15. "Visual" observation is observing the discharge to check for the presence of a visible sheen or floating oil. 16. "Water Quality Coatrol Division" or "Division" means the state Water Quality Control Division as established in 25-8-LOS et Additional relevant definitions are found in the Colorado Water Quality Control Act, CRS §§ 25-8-101 et sec.., the Colorado Disc Permit System Regulations, RegulaEion 61 (S 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 Materials Containment Plan. Such a plan was previously submitted to the Division. An update of the plan shall be subrtrittec Division within ninety days after Ehe effective date of this permit and must be implemented. The update of the plan slrail i changes in the information and procedures for the prevention and containment of spills of taatedals used, processed or s;cre< facility which if spilled would have a reasonable probability of havurg a visible or otherwise detrimental impact on wavers State y ~. 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 [his permit. T¢e shall include a discussion on the cause of the spills and a the preventative measures designed to eliminate they reoccurring; (b) An update of the reporting system which will be used to notify, at a rrrinimum, responsible facility management, the D the Environntentai Pmtect:on Agency, downstream water user within S miles downszeam of the facility, and hxzl officials; (c) A description of any changes in the preventative facilities (including overall facility plot) which prevent, contain, or tre; and unplanned discharges; (d) A current list which includes the volumes or quantities of all materials used, processed, or stored at the facility whicb re a potential spill threat to surface waters. The location of stored material shall be indicated on the facility Blot suhtni item c; (e) An implementation schedule for additional facilities which might be requaed in item c, but which are not yet operations (f) A current lisC of available outside contractors, agencies, or other sources, which coutd he utilized in the event of a spill to clean up its effects. If the facility is capable of handling spills in-house, this shall be documented in the plan; (g) Provision for yearly review and updating of the contingency plan, plus resubmission of the pizn to rue Division if co andlor procedures at the facility change the original plan.