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( /. <br />' rART I <br />Page 2 of 14 <br />D. FOOTNOTES - APPLICABLE TO PRECEDING PAGES <br />8/ The thirty (30) day average shall be determined by the arithmetic mean of all sample <br />collected during a thirty (30) consecutive-day period. Samples shall not be used for more° <br />than one (1) reporting period. (Not applicable to fecal coliform determinations - see_ <br />footnote g/.) <br />J The seven (7) day average shall be determined by the arithmetic mean of all samples taken <br />in a seven (7) day period. Samples may not be used for more than one (1) reporting period. <br />(Not applicable to fecal coliform determinations - aee footnote m/.) <br />J This limitation shall be determined by a single sample or set of samples as required by Part <br />I.B., Sample Type. <br />J When the measurement frequency indicated is quarterly, the samples shall be collected during <br />March, June, September and December, if a continual discharge occurs. If the dlscharge is <br />intermittent, then samples shall be collected during the period that discharge occurs. If <br />the permittee, using the approved analytical methods, monitors any parameter more frequently- <br />than required by this permit, then the results of such monitoring shall be included in then <br />calculation and reporting of the values required in the Discharge Monitoring Report Form or'.' <br />other forms as required by the Division. Such increased frequency shall also be Sndicated. <br />J Definitions of Sample Type <br />1. A "composite" sample, for monitoring requirements, is a minimum of four (4) grad':=' <br />samples collected at equally spaced two (2) hour intervals and proportioned accordin~~ <br />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, <br />observation, or measurement performed on site. <br />4. A "continuous" measurement, for flow monitoring requirements, is a measurement obtaine~~ <br />from an automatic recording device which continually measures flow. <br />5. A "visual" observation, for oil and grease monitoring requirements, is observing the <br />discharge to check for the presence'af a visible sheen or floating oil. <br />6. An "in-situ" measurement, for monitoring requirements, is defined as a single reading®J <br />observation or measurement taken in the field at the point of discharge. <br />7. A "24 hour composite" sample is a combination of at least eight (B) sample aliquots oil <br />at least 100 milliliters, collected at equally spaced Intervals during the operatinE; <br />hours of a facility over a twenty-four (24) hour period. For volatile pollutants, <br />aliquots must be combined in the laboratory immediately before analysis. The composite <br />must be flow proportional; either the time interval between each aliquot or the volume <br />of each aliquot must be proportional to either the wastewater or effluent flow at the <br />time of sampling or the total wastewater or effluent flow since the collection of thei <br />previous aliquot. Aliquots may be collected manually or automatically. <br />J In the event an oil sheen or floating oil is observed, a grab sample shall be collected <br />analyzed, and reported on the appropriate DMR. In addition, corrective action shall be <br />taken immediately to mitigate the discharge of oil and grease. A description of thf <br />corrective action taken should be included with the DMR. <br />