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<br /> <br />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 (24) hour period. For volatile pollutants, <br />aliquots must be combined is the laboratory immediately before <br />analysis. The composite must be flow proportional; either the <br />time interval between each aliquot or the volume of each aliquot <br />must be proportional to either the wastewater or effluent flan at <br />the time of sampling or the total wastewater or effluent flow <br />slnce the collection of the previous aliquot. Aliquots may be <br />collected manually or automatically. <br />f/ - Ia the event an oil sheen, or floating oil is observed, a grab sample <br />shall be collected, analyzed, and reported on the appropriate DMR. <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 DID. <br />$/ - Where based on a minimum of S samples, the permittee demonstrates, to <br /> the satisfaction of the Aster Quality Control Division, that the <br /> level of total dissolved solids (TDS) is the effluent can be <br /> calculated based upon the level of electrical conductivity, the <br /> permittee may measure and report TDS 1n terms of electrical <br /> conductivity. <br />h/ - TDS shall be sampled on a monthly basis until siz 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 siz 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 /> with Regulations For Implementation of the Colorado River Sallaity <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 Part II.A.3.CbJ(v) of this permit. <br />~/ - Procedure far determining settleable solids is contained in 40 CFR <br /> 434.64. The method detection limit for measuring settleable solids <br /> under this part shall be 0.4 ml/1. <br />k/ - Should a precipitation event occur which is greater than the 10-year, <br /> 24-hour event, the permittee shall submit rain gauge or other <br /> appropriate documentation in order for an ezemption 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 Monitoring Report for the appropriate <br /> period. <br />Code: i - 16 Date: 1-84, revised 10-88, revised 12-88 <br />