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PART I <br />Page No. 9 <br />Permit No. CO-0044377 <br />• B. A10NITORING REQUIItENIENTS <br />2. Salinity Parameters (continued) <br />Following submi[[al of the initial six sets of monthly data, the Division shall determine whether the permittee is required <br />to submit a report addressing salt removal in accordance with Regulations For Implementation of the Colorado River <br />Salinity S[andards Through the NPDES Permit Program, 3.10.0. 1(the salinity report is required, the Division shall so <br />advise the permittee by letter or through the inclusion of a compliance schedule and the report shall be submitted within <br />180 days. <br />lvlrcre, based on a minimum of 5 samples, the permi[tce demonstrates to the satisfaction of the Division that the level of <br />total dissolved solids (TDS) in the effluent can be calculated based upon the level oC electrical conductivity, the permitree <br />may measure and report TDS in terms of electrical conductivity. <br />C. DEFINITIONS Or TERMS <br />I. 'Acute Toxicity' means there shall be no acute tonicity in the et(luent from this discharge point. The acute tonicity <br />limitation is exceeded i( 1) a statistically significant difference in mortality (at the 95% confidence level) is observed for <br />either species between the control and any dilution less [hat or equal to the identified IWC or 2) a species mortality in <br />any dilution o(effluen[ (including 100% effluent) exceeds 50%. <br />2. 'Composite" sample is a minimum of four (4) grab samples collected at equally spaced two (2) hour intervals and <br />proportioned according to flow. <br />3. 'Continuous" measurement, is a measurement obtained from an automatic recording device which continually measures <br />provides measurements. <br />• 4. "Daily Maximum limitation' means the limitation for this parameter shall be applied az an instantaneous maximum (or, <br />for pH or DO, instantaneous minimum) value. The instantaneous value is defined as the analytical result of any <br />individual sample. DMRs shall include the maximum (and/or minimum) of all instantaneous values within the calendar <br />month. Any instantaneous value beyond the noted daily maximum limitation for the indicated parameter shall be <br />considered a violation of this permit. <br />5. 'Grab' sample, is a single 'dip and take" sample so as to be representative oC the parameter being monitored. <br />6. "In-situ" measurement is defined az a single reading, observation or measurement taken in the field at the point of <br />discharge. - <br />7. 'Instantaneous' measuremen[ is a single reading, observation, or meazurement performed on site using existing <br />monitoring facilities. <br />8. "Quanerl}• measurement frequency' means samples may be collected at any time during the calendar quarter if a <br />continual discharge occurs. if the discharge is intermittent, then samples shall be collected during the period that <br />discharge occurs. <br />9. 'Seven (7) day average" means the arithmetic mean of all samples collected in a seven (7) consecutive day period. Such <br />seven {7) day averages shall be calculated for all calendar weeks, which are defined as beginning on Sunday and ending <br />on Saturday. If the calendar week overlaps two months (i.e. the Sunday is in one month and the Saturday in the <br />following month), the seven (7) day average calculated for that calendar week shall be associated with the month that <br />contains the Saturday. Samples may not be used for more than one (l) reporting period. <br />10. 'Thirty (30) day average' means the arithmetic mean of all samples collected during a thirty (30) consecwive-day <br />• period. The perntittee shall report the appropriate mean of all self-monitoring sample data collected during the calendar <br />month on the Discharge Monitoring Reports. Samples shall not be used for more than one (1) reposing period. <br />lNDBP Nwam6o Il, (VW <br />