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1'AR"I' I <br />Pnee 2 n} 11 <br />C. I~OO"fN0"fliS - APPLICA6LE l~0 PRECEDING PAGES <br />n/ The thirty (30) day average shall be determined by the arithmetic mean of all samples collected during a thirty (30) <br />consecutive-day period. Samples shall not be used for more than one (1) reporting period. (Not applicable to fecal <br />coliform determinations -see footnote m/.) <br />b/ The seven (7) day average shall be determined by the arithmetic mean of all samples taken in a seven (7) day period. <br />Samples may not be used for more than one (1) reporting period. (Not applicable to fecal coliform determinations <br />- see footnote m/.) <br />c/ This limitation shall be determined by a single sampec or set of samples as required by PaR I.B., Sample Type. <br />d/ When the measurement frequency indicated is quarterly, the samples shall be collated during March, lone, September <br />and December, if a continual dischazge occurs. If the discharge is intermittent, then samples shall be collected during <br />the period Utat discharge oauts. If the permitter, using the approved analytical meUtods, ,monitors any parameter <br />more frequently than required by this permit, then the rrsults of such motitoring shall be included in the calculation <br />and repotting of the values required fa Ute Discharge Monitoring Report Form or other fortes as required by Ute <br />Division. Such increased frequency shall also be indicated. <br />e! Definitions of Sample Type <br />1. A "composite" sample, for monitoring requirements, is a minimum of four (4) grab samples collected at equally <br />spaced two (2) hour intervals and proportioned according to flow. <br />2 A "grab" sample, for monitoring requirements, is a single 'dip and take" sample. <br />3. An 'instantaneous"measurement, for"monitoring requirements, is a single reading, observation, or measurement <br />performed on site. <br />4. A "continuous" measurement, for. flaw monitoring requirements, is a measurement obtained from an automatic <br />recording device which continually measures flow. <br />5. A "visual" observation, for oil and grease monitoring rrquirements, is observing the discharge to check for the <br />presence of a visible sheen or floating oil. <br />6. An 'in-situ" measurement, for monitoring requirements, is defined as a single reading, observafion or measurement <br />taken in rho field at the point of dischazge. <br />7. A "7A hour composite" sample is a combination of at least eight (8) sample aliquots of at least 100 milliliters, <br />collated at equally sparzd intervals during the operating bouts of a facility over etwenty-four (24) hour period. <br />For volatile pollutants, aliquots must be combined in the laboratory immediately before analysis. The composite <br />must be flow propoRional; either the time interval between each aliquot or the volume of each aliquot must be <br />proportional to either the wastewater or effluent flow at the time of sampling or the total wastewater or effluent <br />flow since the collection of the previous aliquot. Aliquots may be collected manually or automatically. <br />f! In the event an oil sheen or floating oil is observed, a grab sample shall be collated, analyzed, and reported on Ute <br />appropriate DMR. In addition, corrective anion shall be taken immediately to mitigate Ute discharge of oil and grease. <br />A description of the corrective action taken should be included with the DMR. <br />g/ Where, based on a minimum of 5 samples, the permittce demonstrates to Ute satisfaction of the Water Quality Control <br />Division that the level of total dissolved solids (TDS) in the effluent can be calculated based upon the level of elecurical <br />conductivity, the permitter may measure and repoR TDS in terms of electrical conductivity. <br />