2008-09-19_PERMIT FILE - C1981018A (2)

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PART II Page No. 14 Permit No.: CO-0038024 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: Outfalls Freguencv Sample Type 001, 004, 008, 009, and 026 Quarterly Grab Self-monitoring 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/monthly basis. Following submittal of the initial six sets of monthly data, the Division shall determine whether the pemuttee 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 pernuttee by letter or through the inclusion of a compliance schedule and the report shall be submitted within 180 days. 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 effluent can be calculated based upon the level of electrical conductivity, the permittee may measure and report TDS in terms of electrical conductivity. C. DEFINITIONS OF TERMS 1. Acute toxicity omeans there shall be no acute toxicity in the effluent from this discharge point. The acute toxicity limitation is exceeded if 1) a statistically significant difference in mortality (at the 95% confidence level) is observed for either species between the control and any dilution less than or equal to the identified IWC or 2) a species mortality in any dilution of effluent (including 100% effluent) exceeds 50%. • 2. "Continuous" measurement is a measurement obtained from an automatic recording device which continually measures provides measurements. 3. "Daily Maximum limitation" means the limitation for this parameter 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 calendar month. Any instantaneous value beyond the noted daily maximum limitation for the indicated parameter shall be considered a violation of this permit. 4. "Grab" sample, is a single "dip and take" sample so as to be representative of the parameter being monitored. 5. "In-situ" measurement is defined as a single reading, observation or measurement taken in the field at the point of discharge. 6. "Instantaneous" measurement is a single reading, observation, or measurement performed on site using existing monitoring facilities. 7. "Quarterly measurement frequency" means samples maybe collected at any time during the calendar quarter if a continual discharge occurs. If the discharge is intermittent, then samples shall be collected during the period that discharge occurs. 8. "Recorder" requires the continuous operation of a chart and/or totalizer (or drinking water rotor meters or pump hour meters where previously approved.) 9. "Seven (7) day average" means, with the exception of fecal coliform bacteria, the arithmetic mean of all samples collected in a seven (7) consecutive day period. For fecal coliform bacteria, it is the geometric mean of all samples taken in a seven (7) consecutive day period. Such seven (7) day averages shall be calculated for all calendar weeks, which are defined as • beginning on Sunday and ending on Saturday. If the calendar week overlaps two months (i.e. the Sunday is in one month and the Saturday in the following month), the seven (7) day average calculated for that calendar week shall be associated with the month that contains the Saturday. Samples may not be used for more than one (1) reporting period. (Not applicable to fecal coliform determinations.)