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PARTI Page No. 8 Pemrit No.: CO-0047562 il This parameter is subject to "Noncompliance Notification" requirements of Part ILA.4.b.(4) of this pemut for violations of the Daily Maximum limitation for this parameter. a. Oil and Crease Monitorine For every outfall with oil and grease monitoring, in the event an oil sheen or floating oil is observed, a grab sample shall be collected, analyzed, and reported on the appropriate DMR. In addition, corzective action shall be taken immediately to mitigate the discharge of oil and grease. A description of the corzective action taken should be included with the DMR. 2. Salinity Parameters 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: Outfall Fregueacy Sample Tvne OOlA Quarterly Orab Self-moniroring samples taken in compliance with the monitoring requirements specified above shall be taken at those locations listed in Part I.B.1. TDS shall be sampled on a monthly basis until six samples have been analyzed. A report of "No Discharge" shall not be counted as one of the six samples. Thereafter, monitoring shall continue on a quarterly basis. Followiug subutittal of the initial six sets of monthly data, the Division shall determine whether the pemrittee is required to submit a report addressing salt removal in accordance with the Colorado River Salinity Standards, Regulation No. (SCCR 1002-39). If the salinity report is required, the Division shall so advise the pemrittee by letter or duough the inclusion of a compliance schedule and the report shall be submitted within I80 days. Where, based on a minimum of 5 samples, the pemrittee demonstrates to the satisfaction of the Division that the level of total dissolved solids (TDS) in the effluent can be calculated based upon the level of elechical conductivity, the permittee may measwe and report TDS in feints of elecMcal conductivity. C. DEFINITIONS OF TERMS 1. "Composite" sample is a minimum of fow (4) grab samples collected at equally spaced two (2) hoar intervals and proportioned according to flow. 2. "Continuous" measurement, is a measwement obtained from an automatic recording device which continually measwes provides measurements. 3. "Daily Maximum limitation" means the limitation for this parameter shall be applied as an instantaneous maximum (og for pH ar DO, instantaneous minirrn,m) 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 calendar montL. Any instantaneous value beyond the noted daily maximum limitation for the indicated pazameter shall be considered a violation of this pemtit. 4. "Dissolved (D) metals fraction" is defined in the Basic Staudards and Methodolo¢ies for Surface Water 100231, as that portion of a water and suspended sediment sample which passed through a 0.40 or 0.45 IJM (micron) membrane filter. Determinations of "dissolved" constituents are made using the filtrate. This may include some very small (colloidal) suspended particles which passed through the membrane filter as well as the amount of substance present in tine chemical solution. 5. "Grab" sample, is a single "dip and take" sample so as to be representative of the pazameter being monitored. 6. "In-situ" measurement is defined as a single reading, observation or measwement taken in the field at the point of discharge. 7. "Instantaneous" measwement is a single reading, observation, or measwement pcrfomud on site using existing monitoring facilities.