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PARTI Page No. 10 Permit No.: CO-0034142 DEFINITIONS OF TERMS (Continued) "Thirty (30) day average" means, except for fecal coliform bacteria, the arithmetic mean of all samples collected during athirty- consecutive-day period. For fecal colifotm bacteria, it is the geometric mean of al] samples collected in a thirty-day period. The permittee shall report the appropriate mean of all self-monitoring sample data collected during Ste calendaz month on the Dischazge Monitoring Reports. Samples shall not be used for more than one reporting period. 17. "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 both tLe 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 equivalertt» 78. "Total Recoverable Metals" means-that portion of a water and suspended sediment sample measwed by the total recoverable analytical procedwe described in "Methods for Chemical Analysis of Water and Wastes, " U.S. Environmental Protection Agency, March 1979 or its equivale~.. 19. "Visual" observation is observing the discharge to check for the presence of a vistble sheen or floating oil. 20. "WaterQuality Control Division" or "Division" means the state Water Quality Control Division as established in 25-8-101 et al.). Additional relevant defmitions aze found in the Colorado Water Quality Control AM, CRS §§ 25-8-101 et seg., the Colorado Discharee Permit Svstem Reeu]ations; (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 Co]orado.Discharge Permit System Regulations, the permittee is required to submit a Materials Containment Plan. Such a plan was previously submitted io 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 the.plan shall include changes in tLe information and procedwes 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 yy. The updated plan shall include, but not necessarily be limited to: (a) An updated history of the spills, which Lave occulted in the three years preceding the effective date of this permit. The history stall include a discussion on the cause- of the spills arid- a the preventative measwes designed to eliminate them from reoccurring; - -- (b) An update of the reporting system which will be used to notify, at a minunum, 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 ove: all facility plot) which prevent, contain, or treat spills and unplanned dischazges; (d) A current list a•hicL includes the velumes or quantities of al] materials used, processed, or stored at the facility which reptesem a potential spill threat to surface waters. The location of stored material shall be indicated on the facility plot submitted for item c; - . . . (e) An implementation schedule for additional facilities which might be required in item c, but which are not yet operational; (fl A cunent list of available outside contractors, agencies, or otter sowces, which could be utilized in the event of a spill in order to clean up its effects. If the facility is capable of handling spills in-house, this shall be doctmtented in the plan; (g) Provision for yearly review and updating of the contingency plan, plus resubmission of the plan to the Division if conditions and/or procedwes at the facility change the original plan , The foregoing provisions shall in no way render inapplicable Orose requirements imposed by the Federal Water Pollution Contro Act, 33 U.S.C. § 1321, regulations promulgated hereunder, the Colorado Water Quality Control Act, and regulations promulgates hereunder. It is recommended that a professional engineer registered in the State of Colorado prepare this plan.