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PART I <br />Page 3 of 19 <br /> <br />C. FOOTNOTES <br />7. A "24 hour composite" sample is a combination of at least eight <br />(8) sample aliquots of at least 100 milliliters, collected at <br />equally spaced intervals during the operating hours of a facility <br />over a twenty-four C24) hour period. For volatile pollutants, <br />aliquots must be combined in the laboratory immediately before <br />analysis. The composite must be flow proportional; wither the <br />time interval between each aliquot or the volume of each aliquot <br />must be proportional to either the wastewater or effluent flow at <br />the time of sampling or the total wastewater or effluent flow <br />since the collection of the previous aliquot. Aliquots may be <br />collected manually or automatically. <br />f/ - In the event an oil sheen, or floating oil is observed, a grab sample <br />shall be collected, analyzed, and reported on the appropriate DFIlZ. <br />In addition, corrective action shall be taken immediately to mitigate <br />the discharge of oil and grease. A description of the corrective <br />action taken should be included with the DhIIt. <br />g/ - Where based oa a minimum of 5 samples, the permittee demonstrates, to <br />the satisfaction of the Water Quality Control Division, that the <br />level of total dissolved solids <TDS) in the effluent can be <br />calculated based upon Cho level of electrical conductivity, the <br />permlttee may measure and report TDS in terms of electrical <br />conducti•rlty. <br />h/ - TDS shall be sampled on a monthly basis until six samples have been <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 six sets of <br />monthly data, the Division shall determine whether the permittee is <br />required to submit a report addressing salt removal in accordance <br />vlth Regulations For Implementation of the Colorado River Salinity . <br />Standards Through the NPDES Permit Program, 3.10.0. If the salinity <br />report is required, the Division shall so advise the permittee by <br />letter and the report shall be submitted within 180 days. <br />i/ - This parameter is subject to "Noncompliance Notification" <br />requirements of ?art IZ.A.3.(b)(v) of this permit. <br />j/ - Procedure Eor determining settleable solids is contained in 40 CFR <br />434.64. The method detection limit for measuring settleable solids <br />under [his part shall be 0.4 ml/l. <br />k/ - Should a precipitation event occur which is greater than the 10-year, <br />24-hour event, the permlttee shall submit rain gauge or other <br />appropriate documentation in order for an exemption to be claimed. <br />In lieu of such documentation, limitations contained in Part • <br />I.A.1.(b), shall apply. Documentation shall be reported as an <br />attachment to the Discharge t4onitoring Report for the appropriate <br />period. <br />Code: 1 - 16 Date: 1-84, revised LO-88, revised 12-88 <br />