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PARTI <br />Page No. 8 <br />Permit No.: CO-0047562 <br />i/ This parameter is subject to "Noncompliance Notification" requirements of Part II.A.4.b.{4) of this permit for violations <br />of the Daily Maximum limitation for this parameter. <br />a. Oil and Grease Monitoring <br />For every outfall with oil and grease monitoring, in the event an oil sheen or floating oil is observed, a grab sample shall <br />be collected, analyzed, and reported on the appropriate DMR. In addition, corrective action shall be taken immediately <br />to mitigate the discharge of oil and grease. A description of the corrective action taken should be inchrded ~~rith the <br />DMR. <br />2. Salinity Parameters <br />In order to obtain an indication of the quantity of Salinity, measured as total dissolved solids (TDS), being discharged from <br />the site the permittee shall monitor the wastewater effluent at the following frequencies: <br />Outfall Frequency Sample Tyne <br />OOlA Quarterly Grab <br />Self-monitoring samples taken in compliance with the monitoring requirements specified above shall be taken at those <br />locations listed in Part T.B.1. TDS shall be sampled on a monthly basis until six samples have been analyzed. A report of <br />"No Discharge" shall not be counted as one of the six samples. Thereafter, monitoring shall continue on a quarterly basis. <br />Following submittal of the initial six sets of monthly data, the Division shall determine whether the permittee is required to <br />submit a report addressing salt removal in accordance with the Colorado River Salinity Standards, Regulation 7~ro. (SCCR <br />1002-39). If the salinity report is requited, the Division shall so advise the permittee by letter or fluough the inclusion of a <br />compliance schedule and the report shall be submitted within 180 days. <br />~~Vlrere, based on a rnimmum of 5 samples, the pernuttee demonstrates to the satisfaction of the Division that the level of total <br />dissolved solids (TDS) in the effluent can be calculated based upon the level of electrical conductivity, the permittee may <br />measure and report TDS in terms of electrical conductivity. <br />C. DEFII\tITIONS OF TEI2i\ZS <br />1. "Composite" sample is a minimum of four (4} grab samples collected at equally spaced hvo (2) hour intervals and <br />proportioned according to flow. <br />2. "Continuous" measurement, is a measurement obtained from an automatic recording device which continually measures <br />provides meas<rrements. <br />3. "Daily Maximum limitation" means the limitation for this parameter shall be applied as an instantaneous maximum (or, for <br />pH or DO, instantaneous minimum) value. The instantaneous value is defined as the analytical result of any individual <br />sample. DMRs shall include the maximum (andlor minimum) of all instantaneous values within the calendar month. Any <br />instantaneous value beyond the noted daily maximum limitation for the'indicated parameter shall be considered a violation of <br />this permit. <br />4. "Dissolved (D) metals fraction" is defined in the Basic Standards and Methodologies for Surface ti~ater 1002-31, as that <br />portion of a water and suspended sediment sample which passed through a 0.40 or 0.45 iJIvi (micron) membrane filter. <br />Determinations of "dissolved" constituents are made using the filtrate. This may include same very small {colloidal) <br />suspended particles which passed through the membrane filter as well as the amount of substance present in true chemical <br />solution. <br />5. "Grab" sample, is a single "dip and take" sample so as to be representative of the parameter being monitored. <br />6. "In-situ" measurement is defined as a single reading, observation or measurement taken in the field at the point of discharge. <br />7. "Instantaneous" measurement is a single reading, observation, or measurement performed on site using existing monitoring <br />facilities. <br />