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~- (~Onity Parameters PARTI Page No. 9 Permit No.: CO-0000132 In order to obtain an indication of the quantity of Salinity, measured as total dissolved solids (TDS), being discharged from the site the permittee shall monitor the wastewater effluent at the following frequencies: Outf~all Freauencv Sample Tvoe 007, 009, 010, 012, 013, 014, 015, 016, 017 and 019 Quarterly Grab Self-monitoring samples taken in compliance with the monitoring requirements specified above shall be taken at those locations listed in Part IJ3.1. Where, based on a minimum of 5 samples, the permittee demonstrates to the satisfaction of the Division that the level of total dissolved solids (TDS) in the effuent can be calculated based upon the level of electrical conductivity, the permittee may measure and report TDS in terms of electrical conductivity. Soecfsl Monitorin[ a. Twelve Time Analysis - Outfall 015 1n order to determine the quality of water discharged at this facility, the permittee is required to perform a twelve tip analysis for the following parameters at outfa1101S. The first sampling shall occur during the first month after the permit becomes effective, or when discharge commences, and sampling shall continue for the neat eleven consecutive months. If no discharge occurs during the month, sampling shall resume when discharge resumes and continue until twelve samples have been collected and analyzed using approved methods with method detection limits as low or lower than those specified in Part I.E.3. of the pemrit. A summary report in the form of a letter shall be submitted to the Penmta Unit by September 30, 2005. This report ~: shall include all individual sample results collected over the twelve month period. Lf sampling is incomplete because no discharge occurred dating part or all of the period, this shall be noted in the report. If sampling has not yet been completed by this date, Htis twelve time analysis requirement shall continue until twelve samples have been collected and analyzed and the results have been submitted to the Permits Unit. Outfall Parameters 015 total recoverable (TR) arsenic, potentially dissolved 1PD) cadmium, PD copper, TR trivalent chromium, dissolved 'trop, TR iron, dissolved manganesq total mercury, PD nickel, PD selenium, PD silver, and PD zinc L` the monitoring shows that there is a reasonable potential for any of these pazameters to cause exceedeace of the applicable water quality standazds, the pemtit may be reopened to add limits and/or monitoring subject to public notice requirements. B. DEFINITIONS OF TERMS 1. "Acute Toxicity" means there shall be no acute toxicity in the effiuent from this dischazge point. The acute toxicity limitation is exceeded if 1) a statistically sigtrificant difference in mortality (at the 95% confidence level) is observed for either species between the control and any dilution less that or equal to the identified IWC or 2) a species mortality in any dilution of effluent (including 100% effluent) exceeds 50%. 2. "Composite" sample is a minimum of four (4) grab samples collected at equally spaced two (2) hour intervals and proportioned according to flow. 3. "Continuous" measurement, is a measurement obtained from an automatic recording device which continually measures provides measurements. 4. "Daily Maximum limitation" means the limitation for this pazameter shall be applied as an instantaneous maximum (or, for pH or DO, instantaneous minimum) value. The instantaneous value is defined as the analytical result of any individual sample. DMRs shall include the maximum (and/or minimum) of all instantaneous values within the calendaz month. Any instantaneous value beyond the noted daily maximum limitation for the indicated parameter shall be considered a violation of this pemtit. . ISSUED: APRIL 28 2004 EFFECTIVE: JUNE 01 2004 EXPIRATION• MAY 31 2009 AMENDED: MAY 16, 2005 EFFECTIVE: JULY Ol. 2005 EXPIRATION: MAY 31.2009