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PRAT I <br />Page 3 of 19 <br />C. POOTNOTES <br />7. A '24 hour composite" sample 1s a combination of at least eight <br />(8) sample aliquots of at Least I00 milliliters, collected ar. <br />equally spaced intervals during the operating hours of a fac:Llity <br />over a twenty-four (24) hour period. For volatile pollutants, <br />aliquots aunt ba coabiaed is the laboratory immediately before <br />analysis. The composite moat ba flaw proportional; either the <br />time interval between each aliquot or the wlume of each aliquot <br />moat be proportional to either the wastewater or effluent: flair at , <br />the time of saapliag or the total wastewater or effluent flaw <br />since the collection of the previous aliquot. Aliquots may be <br />collected manually or automatically. <br />f/ - Ia eha avant an oil sheen, or floating oil is observed, a grab sample <br />shall be collected, analyzed, sad reported oa the appropriate 1)t4t. <br />Ia addition, corrective action shall be taken immediately to mitigate <br />the discharge of oil sad grease. A description of the corrective <br />action taken should be included with the D!!R. <br />~/ - Where based oa a miaiaum of 5 samples, the permittee demonstrates, to <br />the satisfaction of the Rater Quality Control Division, that the <br />level of total dissolved solids (TDS) in the effluent can be <br />calculated based upon the level of electrical conductivity, the <br />peraittee may measure and report TDS is terms of electrica]. <br />conductivity. <br />h/ - TDS shall be sampled oa a monthly basis until siz samples nave bees <br />analyzed. A report of 'No Discharge" shall not be counted as one of <br />the siz samples. Thereafter, monitoring shall continue on a <br />quarterly basis. Following submittal of the initial siz sets of <br />monthly data, the Division shall determine whether the permittee is <br />required to subai,t a report addressing salt removal in accordance <br />with Eegulatioaa For Impleamtation of the Colorado River Salinity <br />Standards Through the NPDES Permit Program, 3.10.0. If ch.e salinity <br />report is required, the Division shall so advise the permi.ttee by <br />letter sad the report shall be submitted within 180 days. <br />i/ - This parameter is subject to 'Noncompliance Notification' <br />requirements of Part II.A.3.(b7(v) of this permit. <br />~/ - Procedure for determining settleable solids is contained .ia ~i0 CFR <br />434.64. The method detection limit for measuring settleable solids <br />under this part shall be U.4 ml/1. <br />k/ - Should a precipitation event occur which is greater than the l0~year, <br />24-hour event, the permittee shall submit rain gauge or ocher <br />appropriate doc~entation in order for as ezemptioa co be: claimed. <br />Ia lieu of such documentation, limitations contained is E'art <br />I.A.1.(b), shall apply. Documentation shall be reported as an <br />attachment to the Discharge Monitoring Report for 6`te appropriate <br />period. <br />Codie: 1 - 16 Date: 1-84, revised 10-88, revised 12-88 <br />